Jamie wrote:> Joerg wrote: > >> miso wrote: >> >>> On 10/23/2012 12:40 PM, Joerg wrote: >>> >>>> miso wrote: >>>> >>>>> On 10/22/2012 3:29 PM, Joerg wrote: >>>>> >>>>>> miso wrote: >>>>>> >>>>>>> On 10/22/2012 2:22 PM, Joerg wrote: >>>>>>> >>>>>>>> Folks, >>>>>>>> >>>>>>>> Looked at Digikey and some others. Where are those huge capacitance >>>>>>>> varicaps? The ones with several hundred pF of range for AM radios. >>>>>>>> All >>>>>>>> gone lalaland by now? >>>>>>>> >>>>>>>> Even the ones I found in the 100pF range are either obsolete or not >>>>>>>> recommended for new designs. >>>>>>>> >>>>>>>> What I am trying to do: I need to control a switcher chip in >>>>>>>> frequency >>>>>>>> because I've got a very resonant load to deal with. >>>>>>>> Unfortunately it >>>>>>>> sets the frequency with a timing cap. I'll have to somehow vary >>>>>>>> that >>>>>>>> between 750pF and 2000pF. Can also be digital but then with a >>>>>>>> granularity of 5pF. The sawtooth voltage across it is 2.5Vpp. >>>>>>>> >>>>>>>> Doing it with caps and a mux chip or two has its own challenges. >>>>>>>> The >>>>>>>> ADG-series from AD is around 11pF per pin, otherwise their Rdson >>>>>>>> is too >>>>>>>> high. Talking about the a rock and a hard spot here. >>>>>>>> >>>>>>>> Oh, and cost is not very important. If a diode or two or three are >>>>>>>> needed that cost $5 a pop that's ok. >>>>>>>> >>>>>>> >>>>>>> There are plenty of hoarders that have those caps. I picked them up >>>>>>> years ago when I figured they would go extinct. They same goes >>>>>>> for 10 >>>>>>> turn pots of the panel variety with the dials on them. (Good old >>>>>>> Mike >>>>>>> Quinn in San Leadro by the Oakland airport would save panels with >>>>>>> those >>>>>>> pots and junk the rest of the product.] Most radios are synthesized >>>>>>> these days, so there is no market for those caps. >>>>>>> >>>>>> >>>>>> Yeah, I know but I was hoping there'd be at least one other market. >>>>>> Seems like there ain't. >>>>>> >>>>>> >>>>>> >>>>>>> If you are not conflating sawtooth with triangle wave, then maybe >>>>>>> you >>>>>>> could shunt some current from the osc pin, which would slow down the >>>>>>> frequency. Pick your external cap for the highest frequency needed, >>>>>>> then >>>>>>> bleed with some DAC based circuit or even a resistive trimpot. The >>>>>>> 10-turn PCB mounted resistors still exist. >>>>>>> >>>>>>> The difficulty will be in the compliance of the current source used >>>>>>> for >>>>>>> bleeding. >>>>>> >>>>>> >>>>>> That won't be a problem but the chip immediately gets sea-sick >>>>>> when you >>>>>> do anything DC to that pin. >>>>>> >>>>> >>>>> Is this pin where you see the sawtooth? Seems to me with a high >>>>> impedance current source, you can steal the current. Now a triangle >>>>> waveform is a different case. >>>>> >>>>> So you have tried a high impedance current source? >>>>> >>>> >>>> Yup. The chip then starts to misfire, big time, at least on the >>>> simulator. >>>> >>> >>> None I ever designed would care. >>> >> >> >> Probably this one doesn't either, it's the simulator model that does. On >> this design I absolutely need a simulator model because of the ugly >> load. That shuts out most vendors. >> >> >> >>> BTW, you can always make a sawtooth generator go faster by inserting a >>> resistor in series with the cap. Basically it adds a step to the saw >>> tooth, getting you to the limit faster. >>> >> >> >> Can't do that here. The chip has internal comparators and certain things >> need to happen at certain times on the ramp. So I'd rather keep that >> ramp linear. >> > > Have you tried the op-amp trick to vary a fixed capacitor? > > Depending on which way you need to shift it, lead of Lag will depend > if you do a invert or non-inverting input. > > This is done commonly using a LM324 in many circuits., > > > > > > > > > > +/- rail supply > > Lead circuit > +------------+ > | | > REf in | | > + | |\| | REF out > | +--+|-\ | ___ > | | >-+---+----------+-|___|+---------+---------+ > +----------+-|+/ | | > /| | --- Lead Cap > | +--------++ --- > | | + + > | | |\| | | > + +--+|-\ + ___ | > .-. | >+-++-|___|++ > | |<-+----+--+|+/ > | | |/| > Lead Gain (D)'-' > | > === > GND > (created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de) > > > > This isn't exactly what you would use but is shows how you can bring in > a cap with the lead gain. This will insert the "Lead Cap" via the lead > gain and forward reference coming in. > > Something to look at any way.Someone in the thread suggested something similar a while ago. A problem is that the chip issues a reset pulse of about 50mA. But I've got it running now, with current source. -- Regards, Joerg http://www.analogconsultants.com/
Large capacitance varicaps, where are thee?
Started by ●October 22, 2012
Reply by ●October 31, 20122012-10-31
Reply by ●November 7, 20122012-11-07
On Mon, 22 Oct 2012 21:14:34 -0500, legg <legg@nospam.magma.ca> wrote:>On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <invalid@invalid.invalid> >wrote: > >>legg wrote: >>> On Mon, 22 Oct 2012 14:22:49 -0700, Joerg <invalid@invalid.invalid> >>> wrote: >>> >>>> Folks, >>>> >>>> Looked at Digikey and some others. Where are those huge capacitance >>>> varicaps? The ones with several hundred pF of range for AM radios. All >>>> gone lalaland by now? >>>> >>>> Even the ones I found in the 100pF range are either obsolete or not >>>> recommended for new designs. >>>> >>>> What I am trying to do: I need to control a switcher chip in frequency >>>> because I've got a very resonant load to deal with. Unfortunately it >>>> sets the frequency with a timing cap. I'll have to somehow vary that >>>> between 750pF and 2000pF. Can also be digital but then with a >>>> granularity of 5pF. The sawtooth voltage across it is 2.5Vpp. >>>> >>>> Doing it with caps and a mux chip or two has its own challenges. The >>>> ADG-series from AD is around 11pF per pin, otherwise their Rdson is too >>>> high. Talking about the a rock and a hard spot here. >>>> >>>> Oh, and cost is not very important. If a diode or two or three are >>>> needed that cost $5 a pop that's ok. >>> >>> SVC383 ex-Sanyo, is still in the ON catalog, with no product notices >>> re last run or anything. Dual 500pf. >>> >>> http://www.onsemi.com/pub_link/Collateral/ENN6264-D.PDF >>> >> >>Thanks, but I've been through that as well. Here is the bad news: >> >>http://www.digikey.com/product-detail/en/SVC383T-TL-E/869-1202-2-ND/2165536 >> >>Quote "Obsolete item; call Digi-Key for more information". > >I receive all ON product notices (spec, process, material, source, >discontinuance, resurection etc etc etc) changes, and there's nothing >on SVC383. > >Did you ask the ON recommended vendor - Rochester Electronics? They >also have no stock, but they shouldn't give you a phoney reason for >this. Digikey still lists their supplier for SVC389 as Sanyo >Semiconductor (USA), so their info for both parts may be dated. Did >you actually ask Digikey? Looks like the usual minimum purchase of a >reel, for items not recently stocked. > >The issue is more likely a Sanyo-based supply chain one - strictly >sales related. I'd sniff around previously reliable Sanyo distribution >outlets (not excluding Digikey). SVC389 was also an RS Component line >item. >Correction on that: ON issued a massive product discontinuance notice (PD16800) which included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year. This was due to the catastrophic flooding in Thailand at that time. US contact for existing inventory inquiries is listed as Mark Gabrielle (email is Mark.Gabrielle@onsemi.com) 602.244.3115 USA RL
Reply by ●November 7, 20122012-11-07
legg wrote:> On Mon, 22 Oct 2012 21:14:34 -0500, legg <legg@nospam.magma.ca> wrote: > >> On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <invalid@invalid.invalid> >> wrote: >> >>> legg wrote: >>>> On Mon, 22 Oct 2012 14:22:49 -0700, Joerg <invalid@invalid.invalid> >>>> wrote: >>>> >>>>> Folks, >>>>> >>>>> Looked at Digikey and some others. Where are those huge capacitance >>>>> varicaps? The ones with several hundred pF of range for AM radios. All >>>>> gone lalaland by now? >>>>> >>>>> Even the ones I found in the 100pF range are either obsolete or not >>>>> recommended for new designs. >>>>> >>>>> What I am trying to do: I need to control a switcher chip in frequency >>>>> because I've got a very resonant load to deal with. Unfortunately it >>>>> sets the frequency with a timing cap. I'll have to somehow vary that >>>>> between 750pF and 2000pF. Can also be digital but then with a >>>>> granularity of 5pF. The sawtooth voltage across it is 2.5Vpp. >>>>> >>>>> Doing it with caps and a mux chip or two has its own challenges. The >>>>> ADG-series from AD is around 11pF per pin, otherwise their Rdson is too >>>>> high. Talking about the a rock and a hard spot here. >>>>> >>>>> Oh, and cost is not very important. If a diode or two or three are >>>>> needed that cost $5 a pop that's ok. >>>> SVC383 ex-Sanyo, is still in the ON catalog, with no product notices >>>> re last run or anything. Dual 500pf. >>>> >>>> http://www.onsemi.com/pub_link/Collateral/ENN6264-D.PDF >>>> >>> Thanks, but I've been through that as well. Here is the bad news: >>> >>> http://www.digikey.com/product-detail/en/SVC383T-TL-E/869-1202-2-ND/2165536 >>> >>> Quote "Obsolete item; call Digi-Key for more information". >> I receive all ON product notices (spec, process, material, source, >> discontinuance, resurection etc etc etc) changes, and there's nothing >> on SVC383. >> >> Did you ask the ON recommended vendor - Rochester Electronics? They >> also have no stock, but they shouldn't give you a phoney reason for >> this. Digikey still lists their supplier for SVC389 as Sanyo >> Semiconductor (USA), so their info for both parts may be dated. Did >> you actually ask Digikey? Looks like the usual minimum purchase of a >> reel, for items not recently stocked. >> >> The issue is more likely a Sanyo-based supply chain one - strictly >> sales related. I'd sniff around previously reliable Sanyo distribution >> outlets (not excluding Digikey). SVC389 was also an RS Component line >> item. >> > > Correction on that: > > ON issued a massive product discontinuance notice (PD16800) which > included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year. > > This was due to the catastrophic flooding in Thailand at that time. > > US contact for existing inventory inquiries is listed as > > Mark Gabrielle (email is Mark.Gabrielle@onsemi.com) > 602.244.3115 > USA >I doubt flooding is the real reason. There just is no market of sufficient size for these anymore. -- Regards, Joerg http://www.analogconsultants.com/
Reply by ●November 8, 20122012-11-08
On Wed, 07 Nov 2012 14:17:33 -0800, Joerg <invalid@invalid.invalid> wrote:>legg wrote: >> On Mon, 22 Oct 2012 21:14:34 -0500, legg <legg@nospam.magma.ca> wrote: >> >>> On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <invalid@invalid.invalid> >>> wrote: >>><snip>>>>> Quote "Obsolete item; call Digi-Key for more information". >>> I receive all ON product notices (spec, process, material, source, >>> discontinuance, resurection etc etc etc) changes, and there's nothing >>> on SVC383. >>> >>> Did you ask the ON recommended vendor - Rochester Electronics? They >>> also have no stock, but they shouldn't give you a phoney reason for >>> this. Digikey still lists their supplier for SVC389 as Sanyo >>> Semiconductor (USA), so their info for both parts may be dated. Did >>> you actually ask Digikey? Looks like the usual minimum purchase of a >>> reel, for items not recently stocked. >>> >>> The issue is more likely a Sanyo-based supply chain one - strictly >>> sales related. I'd sniff around previously reliable Sanyo distribution >>> outlets (not excluding Digikey). SVC389 was also an RS Component line >>> item. >>> >> >> Correction on that: >> >> ON issued a massive product discontinuance notice (PD16800) which >> included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year. >> >> This was due to the catastrophic flooding in Thailand at that time. >> >> US contact for existing inventory inquiries is listed as >> >> Mark Gabrielle (email is Mark.Gabrielle@onsemi.com) >> 602.244.3115 >> USA >> > >I doubt flooding is the real reason. There just is no market of >sufficient size for these anymore.They shut down the manufacturing facility. "SANYO Semiconductor Thailand Co., Ltd. (SSTH)" PD16800 covered over 200 discrete and integrated line items, half of which had no recommended substitute, regardless of supplier ( other sources' replacement products listed in this PD included Sanken, Toshiba, NXP, Rohm, STMicro, Renesas, IR, Fairchild, MPS, Maxim and ASAHIKASEI ). The question is - Is there enough market to reopen or transfer the product from the Sanyo subsidiary to an ON/Sanyo subsidiary. Supposedly, they can get this info from inventory enquiries..... RL
Reply by ●November 8, 20122012-11-08
On Thu, 08 Nov 2012 16:22:44 -0500, legg <legg@nospam.magma.ca> wrote:>On Wed, 07 Nov 2012 14:17:33 -0800, Joerg <invalid@invalid.invalid> >wrote: > >>legg wrote: >>> On Mon, 22 Oct 2012 21:14:34 -0500, legg <legg@nospam.magma.ca> wrote: >>> >>>> On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <invalid@invalid.invalid> >>>> wrote: >>>> ><snip> >>>>> Quote "Obsolete item; call Digi-Key for more information". >>>> I receive all ON product notices (spec, process, material, source, >>>> discontinuance, resurection etc etc etc) changes, and there's nothing >>>> on SVC383. >>>> >>>> Did you ask the ON recommended vendor - Rochester Electronics? They >>>> also have no stock, but they shouldn't give you a phoney reason for >>>> this. Digikey still lists their supplier for SVC389 as Sanyo >>>> Semiconductor (USA), so their info for both parts may be dated. Did >>>> you actually ask Digikey? Looks like the usual minimum purchase of a >>>> reel, for items not recently stocked. >>>> >>>> The issue is more likely a Sanyo-based supply chain one - strictly >>>> sales related. I'd sniff around previously reliable Sanyo distribution >>>> outlets (not excluding Digikey). SVC389 was also an RS Component line >>>> item. >>>> >>> >>> Correction on that: >>> >>> ON issued a massive product discontinuance notice (PD16800) which >>> included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year. >>> >>> This was due to the catastrophic flooding in Thailand at that time. >>> >>> US contact for existing inventory inquiries is listed as >>> >>> Mark Gabrielle (email is Mark.Gabrielle@onsemi.com) >>> 602.244.3115 >>> USA >>> >> >>I doubt flooding is the real reason. There just is no market of >>sufficient size for these anymore. > >They shut down the manufacturing facility. > >"SANYO Semiconductor Thailand Co., Ltd. (SSTH)" > >PD16800 covered over 200 discrete and integrated line items, half of >which had no recommended substitute, regardless of supplier ( other >sources' replacement products listed in this PD included Sanken, >Toshiba, NXP, Rohm, STMicro, Renesas, IR, Fairchild, MPS, Maxim and >ASAHIKASEI ). > >The question is - Is there enough market to reopen or transfer the >product from the Sanyo subsidiary to an ON/Sanyo subsidiary. >Supposedly, they can get this info from inventory enquiries..... >Quite obviously they weren't worth the effort to restart the lines, there or elsewhere.
Reply by ●November 9, 20122012-11-09
On Thu, 08 Nov 2012 18:32:45 -0500, krw@att.bizzz wrote:>On Thu, 08 Nov 2012 16:22:44 -0500, legg <legg@nospam.magma.ca> wrote: > >>On Wed, 07 Nov 2012 14:17:33 -0800, Joerg <invalid@invalid.invalid> >>wrote: >> >>>legg wrote: >>>> On Mon, 22 Oct 2012 21:14:34 -0500, legg <legg@nospam.magma.ca> wrote: >>>> >>>>> On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <invalid@invalid.invalid> >>>>> wrote: >>>>> >><snip> >>>>>> Quote "Obsolete item; call Digi-Key for more information". >>>>> I receive all ON product notices (spec, process, material, source, >>>>> discontinuance, resurection etc etc etc) changes, and there's nothing >>>>> on SVC383. >>>>> >>>>> Did you ask the ON recommended vendor - Rochester Electronics? They >>>>> also have no stock, but they shouldn't give you a phoney reason for >>>>> this. Digikey still lists their supplier for SVC389 as Sanyo >>>>> Semiconductor (USA), so their info for both parts may be dated. Did >>>>> you actually ask Digikey? Looks like the usual minimum purchase of a >>>>> reel, for items not recently stocked. >>>>> >>>>> The issue is more likely a Sanyo-based supply chain one - strictly >>>>> sales related. I'd sniff around previously reliable Sanyo distribution >>>>> outlets (not excluding Digikey). SVC389 was also an RS Component line >>>>> item. >>>>> >>>> >>>> Correction on that: >>>> >>>> ON issued a massive product discontinuance notice (PD16800) which >>>> included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year. >>>> >>>> This was due to the catastrophic flooding in Thailand at that time. >>>> >>>> US contact for existing inventory inquiries is listed as >>>> >>>> Mark Gabrielle (email is Mark.Gabrielle@onsemi.com) >>>> 602.244.3115 >>>> USA >>>> >>> >>>I doubt flooding is the real reason. There just is no market of >>>sufficient size for these anymore. >> >>They shut down the manufacturing facility. >> >>"SANYO Semiconductor Thailand Co., Ltd. (SSTH)" >> >>PD16800 covered over 200 discrete and integrated line items, half of >>which had no recommended substitute, regardless of supplier ( other >>sources' replacement products listed in this PD included Sanken, >>Toshiba, NXP, Rohm, STMicro, Renesas, IR, Fairchild, MPS, Maxim and >>ASAHIKASEI ). >> >>The question is - Is there enough market to reopen or transfer the >>product from the Sanyo subsidiary to an ON/Sanyo subsidiary. >>Supposedly, they can get this info from inventory enquiries..... >> >Quite obviously they weren't worth the effort to restart the lines, >there or elsewhere.It won't be obvious until regular distributors actually stop listing the parts, but it makes use of them an unlikely choice for new product development. RL
Reply by ●November 9, 20122012-11-09
On Fri, 09 Nov 2012 14:35:35 -0500, legg <legg@nospam.magma.ca> wrote:>On Thu, 08 Nov 2012 18:32:45 -0500, krw@att.bizzz wrote: > >>On Thu, 08 Nov 2012 16:22:44 -0500, legg <legg@nospam.magma.ca> wrote: >> >>>On Wed, 07 Nov 2012 14:17:33 -0800, Joerg <invalid@invalid.invalid> >>>wrote: >>> >>>>legg wrote: >>>>> On Mon, 22 Oct 2012 21:14:34 -0500, legg <legg@nospam.magma.ca> wrote: >>>>> >>>>>> On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <invalid@invalid.invalid> >>>>>> wrote: >>>>>> >>><snip> >>>>>>> Quote "Obsolete item; call Digi-Key for more information". >>>>>> I receive all ON product notices (spec, process, material, source, >>>>>> discontinuance, resurection etc etc etc) changes, and there's nothing >>>>>> on SVC383. >>>>>> >>>>>> Did you ask the ON recommended vendor - Rochester Electronics? They >>>>>> also have no stock, but they shouldn't give you a phoney reason for >>>>>> this. Digikey still lists their supplier for SVC389 as Sanyo >>>>>> Semiconductor (USA), so their info for both parts may be dated. Did >>>>>> you actually ask Digikey? Looks like the usual minimum purchase of a >>>>>> reel, for items not recently stocked. >>>>>> >>>>>> The issue is more likely a Sanyo-based supply chain one - strictly >>>>>> sales related. I'd sniff around previously reliable Sanyo distribution >>>>>> outlets (not excluding Digikey). SVC389 was also an RS Component line >>>>>> item. >>>>>> >>>>> >>>>> Correction on that: >>>>> >>>>> ON issued a massive product discontinuance notice (PD16800) which >>>>> included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year. >>>>> >>>>> This was due to the catastrophic flooding in Thailand at that time. >>>>> >>>>> US contact for existing inventory inquiries is listed as >>>>> >>>>> Mark Gabrielle (email is Mark.Gabrielle@onsemi.com) >>>>> 602.244.3115 >>>>> USA >>>>> >>>> >>>>I doubt flooding is the real reason. There just is no market of >>>>sufficient size for these anymore. >>> >>>They shut down the manufacturing facility. >>> >>>"SANYO Semiconductor Thailand Co., Ltd. (SSTH)" >>> >>>PD16800 covered over 200 discrete and integrated line items, half of >>>which had no recommended substitute, regardless of supplier ( other >>>sources' replacement products listed in this PD included Sanken, >>>Toshiba, NXP, Rohm, STMicro, Renesas, IR, Fairchild, MPS, Maxim and >>>ASAHIKASEI ). >>> >>>The question is - Is there enough market to reopen or transfer the >>>product from the Sanyo subsidiary to an ON/Sanyo subsidiary. >>>Supposedly, they can get this info from inventory enquiries..... >>> >>Quite obviously they weren't worth the effort to restart the lines, >>there or elsewhere. > >It won't be obvious until regular distributors actually stop listing >the parts, but it makes use of them an unlikely choice for new >product development.Huh? You wait until the distys run out before you stop designing with obsolete parts? As soon as there is a whiff that a part is going down, I'm outta here. We have one now that the supplier decided to get out of the market until we told them why we picked their part. They decided to stay in the market but there is a 75% chance that we'll dump them anyway. Just can't take those chances.
Reply by ●November 9, 20122012-11-09
On 9 Nov., 20:34, legg <l...@nospam.magma.ca> wrote:> On Thu, 08 Nov 2012 18:32:45 -0500, k...@att.bizzz wrote: > >On Thu, 08 Nov 2012 16:22:44 -0500, legg <l...@nospam.magma.ca> wrote: > > >>On Wed, 07 Nov 2012 14:17:33 -0800, Joerg <inva...@invalid.invalid> > >>wrote: > > >>>legg wrote: > >>>> On Mon, 22 Oct 2012 21:14:34 -0500, legg <l...@nospam.magma.ca> wrot=e:> > >>>>> On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <inva...@invalid.invalid> > >>>>> wrote: > > >><snip> > >>>>>> Quote "Obsolete item; call Digi-Key for more information". > >>>>> I receive all ON product notices (spec, process, material, source, > >>>>> discontinuance, resurection etc etc etc) changes, and there's nothi=ng> >>>>> on SVC383. > > >>>>> Did you ask the ON recommended vendor - Rochester Electronics? They > >>>>> also have no stock, but they shouldn't give you a phoney reason for > >>>>> this. Digikey still lists their supplier for SVC389 as Sanyo > >>>>> Semiconductor (USA), so their info for both parts may be dated. Did > >>>>> you actually ask Digikey? Looks like the usual minimum purchase of =a> >>>>> reel, for items not recently stocked. > > >>>>> The issue is more likely a Sanyo-based supply chain one - strictly > >>>>> sales related. I'd sniff around previously reliable Sanyo distribut=ion> >>>>> outlets (not excluding Digikey). SVC389 was also an RS Component li=ne> >>>>> item. > > >>>> Correction on that: > > >>>> ON issued a massive product discontinuance notice (PD16800) which > >>>> included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year=.> > >>>> This was due to the catastrophic flooding in Thailand at that time. > > >>>> US contact for existing inventory inquiries is listed as > > >>>> Mark Gabrielle (email is Mark.Gabrie...@onsemi.com) > >>>> 602.244.3115 > >>>> USA > > >>>I doubt flooding is the real reason. There just is no market of > >>>sufficient size for these anymore. > > >>They shut down the manufacturing facility. > > >>"SANYO Semiconductor Thailand Co., Ltd. (SSTH)" > > >>PD16800 covered over 200 discrete and integrated line items, half of > >>which had no recommended substitute, regardless of supplier ( other > >>sources' replacement products listed in this PD included Sanken, > >>Toshiba, NXP, Rohm, STMicro, Renesas, IR, Fairchild, MPS, Maxim and > >>ASAHIKASEI ). > > >>The question is - Is there enough market to reopen or transfer the > >>product from the Sanyo subsidiary to an ON/Sanyo subsidiary. > >>Supposedly, they can get this info from inventory enquiries..... > > >Quite obviously they weren't worth the effort to restart the lines, > >there or elsewhere. > > It won't be obvious until regular distributors actually stop listing > the =A0parts, but it makes use of them an unlikely choice for new > product development. > > RLdoesn't parts(that are actually used) on the way out tend to have some exponential price increase? Does tend to make sure that the ones who really need them get them, not some one who just picked it because it was the first they found -Lasse
Reply by ●November 10, 20122012-11-10
On Fri, 9 Nov 2012 17:06:44 -0800 (PST), "langwadt@fonz.dk" <langwadt@fonz.dk> wrote:>On 9 Nov., 20:34, legg <l...@nospam.magma.ca> wrote: >> On Thu, 08 Nov 2012 18:32:45 -0500, k...@att.bizzz wrote: >> >On Thu, 08 Nov 2012 16:22:44 -0500, legg <l...@nospam.magma.ca> wrote: >> >> >>On Wed, 07 Nov 2012 14:17:33 -0800, Joerg <inva...@invalid.invalid> >> >>wrote: >> >> >>>legg wrote: >> >>>> On Mon, 22 Oct 2012 21:14:34 -0500, legg <l...@nospam.magma.ca> wrote: >> >> >>>>> On Mon, 22 Oct 2012 16:38:28 -0700, Joerg <inva...@invalid.invalid> >> >>>>> wrote: >> >> >><snip> >> >>>>>> Quote "Obsolete item; call Digi-Key for more information". >> >>>>> I receive all ON product notices (spec, process, material, source, >> >>>>> discontinuance, resurection etc etc etc) changes, and there's nothing >> >>>>> on SVC383. >> >> >>>>> Did you ask the ON recommended vendor - Rochester Electronics? They >> >>>>> also have no stock, but they shouldn't give you a phoney reason for >> >>>>> this. Digikey still lists their supplier for SVC389 as Sanyo >> >>>>> Semiconductor (USA), so their info for both parts may be dated. Did >> >>>>> you actually ask Digikey? Looks like the usual minimum purchase of a >> >>>>> reel, for items not recently stocked. >> >> >>>>> The issue is more likely a Sanyo-based supply chain one - strictly >> >>>>> sales related. I'd sniff around previously reliable Sanyo distribution >> >>>>> outlets (not excluding Digikey). SVC389 was also an RS Component line >> >>>>> item. >> >> >>>> Correction on that: >> >> >>>> ON issued a massive product discontinuance notice (PD16800) which >> >>>> included Sony parts SVC233, SVC383 and SVC389 on 17 Jan of this year. >> >> >>>> This was due to the catastrophic flooding in Thailand at that time. >> >> >>>> US contact for existing inventory inquiries is listed as >> >> >>>> Mark Gabrielle (email is Mark.Gabrie...@onsemi.com) >> >>>> 602.244.3115 >> >>>> USA >> >> >>>I doubt flooding is the real reason. There just is no market of >> >>>sufficient size for these anymore. >> >> >>They shut down the manufacturing facility. >> >> >>"SANYO Semiconductor Thailand Co., Ltd. (SSTH)" >> >> >>PD16800 covered over 200 discrete and integrated line items, half of >> >>which had no recommended substitute, regardless of supplier ( other >> >>sources' replacement products listed in this PD included Sanken, >> >>Toshiba, NXP, Rohm, STMicro, Renesas, IR, Fairchild, MPS, Maxim and >> >>ASAHIKASEI ). >> >> >>The question is - Is there enough market to reopen or transfer the >> >>product from the Sanyo subsidiary to an ON/Sanyo subsidiary. >> >>Supposedly, they can get this info from inventory enquiries..... >> >> >Quite obviously they weren't worth the effort to restart the lines, >> >there or elsewhere. >> >> It won't be obvious until regular distributors actually stop listing >> the �parts, but it makes use of them an unlikely choice for new >> product development. >> >> RL > >doesn't parts(that are actually used) on the way out tend to have some >exponential price increase?After the production halts, sure. Those who didn't prepare pay the scalpers. Unless you're so small that you buy only off the Internet from DigiKey, and such, you do get discontinuance notices. Sometimes they fall through the cracks (no system is perfect) but there are warnings.>Does tend to make sure that the ones who really need them get them, >not some one who just picked it because it was the first >they foundDoesn't anyone look at the NOT FOR USE IN NEW DESIGNS warnings?
Reply by ●November 10, 20122012-11-10
On Fri, 09 Nov 2012 23:01:52 -0500, krw@att.bizzz wrote:>On Fri, 9 Nov 2012 17:06:44 -0800 (PST), "langwadt@fonz.dk" ><langwadt@fonz.dk> wrote: > >>On 9 Nov., 20:34, legg <l...@nospam.magma.ca> wrote:<snip>>>> It won't be obvious until regular distributors actually stop listing >>> the �parts, but it makes use of them an unlikely choice for new >>> product development. >>> >>> RL >> >>doesn't parts(that are actually used) on the way out tend to have some >>exponential price increase? > >After the production halts, sure. Those who didn't prepare pay the >scalpers. Unless you're so small that you buy only off the Internet >from DigiKey, and such, you do get discontinuance notices. Sometimes >they fall through the cracks (no system is perfect) but there are >warnings. > >>Does tend to make sure that the ones who really need them get them, >>not some one who just picked it because it was the first >>they found > >Doesn't anyone look at the NOT FOR USE IN NEW DESIGNS warnings?Doesn't anyone require multiple sourcing any more? My boms tend to require THREE inependently sourced parts, as purchasing options. I relax at home, though, by building stuff from unobtanium. RL
