On 08/09/2018 11:47 AM, John Larkin wrote:> On Thu, 9 Aug 2018 09:19:31 -0400, Phil Hobbs > <pcdhSpamMeSenseless@electrooptical.net> wrote: > >> On 08/09/2018 07:49 AM, Steve Wilson wrote: >>> On Wednesday, August 8, 2018 at 7:59:30 PM UTC-4, Phil Hobbs wrote: >>>> I'm doing a Class G driver for a thermoelectric cooler. (I don't want >>>> to use Class D because of the switching trash--with Class G it's a lot >>>> easier to get good filtering in a small space.) >>>> >>>> One issue is that the power supply on the Class G will be only a few >>>> volts, and the control electronics is running on +12, so it's easy to >>>> zener the BE junctions of various transistors. >>>> >>>> The 2SD2704K is a superbeta NPN with a BV_EBO of 25V, which is great, >>>> but there seems to be no PNP that gets anywhere close to that. I can >>>> protect the PNPs with diodes, but that's inelegant--I'd much rather have >>>> a PNP that can take 10V B-E. >>>> >>>> Any faves? >>>> >>>> Cheers >>>> >>>> Phil Hobbs >> >>> Your circuit arrangement is not clear. According to TI, class G is simply complimentary emitter followers with switched supply voltages. For example, see >>> >>> PowerWise?< Class G versus Class AB Headphone Amplifiers >>> >>> Figure 3. Basic Class G Design Using Split-Supply Class AB Output Stage >>> >>> Figure 4. Music Output Example >>> >>> http://www.ti.com/lit/an/snaa128/snaa128.pdf >>> >>> In this application, the transistors can never be reverse biased more than half a volt or so. >>> >>> Your application is completely different. You are not amplifying music, you are supplying power to a resistive load. Why do you need a PNP, and why can it be reverse biased by 12V? >>> >>> Please explain!! >>> >> >> I'd post the circuit except that it's a customer job. The topology is >> an asymmetrical bridge. One side is a current conveyor with a gain of >> about 500, and the other is a normal emitter follower totem pole >> arranged to keep the outputs symmetrical about VCC/2. It has to be >> pretty small, so there's no space for thermal pours. >> >> The TEC is a very low-Z load, but its potentially large thermocouple >> voltage makes it a four-quadrant device. > > It that only a transient condition? > > I remember, from way too long ago, some PNPs that had high Vbe > breakdown. 2N2906 maybe? The data sheets say 5 volts, but they are > probably just playing it safe. > > > > > > > That means that a fixed supply >> voltage for the driver requires a lot of headroom, which leads to a lot >> of dissipation most of the time. So fixed supplies are out. >> >> A Class D amplifier uses one or sometimes two PWM outputs with LC >> filters. In small audio amps, the speaker's inductance is often enough >> to work with, so you can get away with no filter at all. The hash this >> generates is a real problem with TECs, because there's a lot of >> capacitance between the TEC elements and the cold plate, so the hash >> gets into the diode laser bias and causes spurs. >> >> In Class G, you use an agile switching power supply and a linear output >> stage. That way you can keep the dissipation low while preserving the >> naturally good filtering provided by the output stage, which works like >> a capacitance multiplier. > > Seems like an h-bridge switcher with good filtering would work. Or a > single buck switcher with an outrageous filter and then a reversing > switch downstream, SSRs maybe. Does having controlled gain in the > linear stage help?The spurious spec is outrageously tight, though. It's the quietness of the driver that's the selling point. (Very low BOM cost doesn't hurt either.) The downside is that there are a fair number of parts.> You could do a switcher-based control loop and literally add your > c-multiplier filters, which would only lose one or two jd's.Yup. I'm using some super-low V_CEsat transistors (ZXTN25020), and have a higher voltage supply available, so I don't even lose the whole junction drop. One consideration is that this is actually a customization of an existing design, so the NRE budget isn't lush and there's licensing revenue as an upside. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
PNPs with high BV_EBO
Started by ●August 8, 2018
Reply by ●August 9, 20182018-08-09
Reply by ●August 9, 20182018-08-09
On Thu, 9 Aug 2018 12:21:22 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>On 08/09/2018 11:47 AM, John Larkin wrote: >> On Thu, 9 Aug 2018 09:19:31 -0400, Phil Hobbs >> <pcdhSpamMeSenseless@electrooptical.net> wrote: >> >>> On 08/09/2018 07:49 AM, Steve Wilson wrote: >>>> On Wednesday, August 8, 2018 at 7:59:30 PM UTC-4, Phil Hobbs wrote: >>>>> I'm doing a Class G driver for a thermoelectric cooler. (I don't want >>>>> to use Class D because of the switching trash--with Class G it's a lot >>>>> easier to get good filtering in a small space.) >>>>> >>>>> One issue is that the power supply on the Class G will be only a few >>>>> volts, and the control electronics is running on +12, so it's easy to >>>>> zener the BE junctions of various transistors. >>>>> >>>>> The 2SD2704K is a superbeta NPN with a BV_EBO of 25V, which is great, >>>>> but there seems to be no PNP that gets anywhere close to that. I can >>>>> protect the PNPs with diodes, but that's inelegant--I'd much rather have >>>>> a PNP that can take 10V B-E. >>>>> >>>>> Any faves? >>>>> >>>>> Cheers >>>>> >>>>> Phil Hobbs >>> >>>> Your circuit arrangement is not clear. According to TI, class G is simply complimentary emitter followers with switched supply voltages. For example, see >>>> >>>> PowerWise?< Class G versus Class AB Headphone Amplifiers >>>> >>>> Figure 3. Basic Class G Design Using Split-Supply Class AB Output Stage >>>> >>>> Figure 4. Music Output Example >>>> >>>> http://www.ti.com/lit/an/snaa128/snaa128.pdf >>>> >>>> In this application, the transistors can never be reverse biased more than half a volt or so. >>>> >>>> Your application is completely different. You are not amplifying music, you are supplying power to a resistive load. Why do you need a PNP, and why can it be reverse biased by 12V? >>>> >>>> Please explain!! >>>> >>> >>> I'd post the circuit except that it's a customer job. The topology is >>> an asymmetrical bridge. One side is a current conveyor with a gain of >>> about 500, and the other is a normal emitter follower totem pole >>> arranged to keep the outputs symmetrical about VCC/2. It has to be >>> pretty small, so there's no space for thermal pours. >>> >>> The TEC is a very low-Z load, but its potentially large thermocouple >>> voltage makes it a four-quadrant device. >> >> It that only a transient condition? >> >> I remember, from way too long ago, some PNPs that had high Vbe >> breakdown. 2N2906 maybe? The data sheets say 5 volts, but they are >> probably just playing it safe. >> >> >> >> >> >> >> That means that a fixed supply >>> voltage for the driver requires a lot of headroom, which leads to a lot >>> of dissipation most of the time. So fixed supplies are out. >>> >>> A Class D amplifier uses one or sometimes two PWM outputs with LC >>> filters. In small audio amps, the speaker's inductance is often enough >>> to work with, so you can get away with no filter at all. The hash this >>> generates is a real problem with TECs, because there's a lot of >>> capacitance between the TEC elements and the cold plate, so the hash >>> gets into the diode laser bias and causes spurs. >>> >>> In Class G, you use an agile switching power supply and a linear output >>> stage. That way you can keep the dissipation low while preserving the >>> naturally good filtering provided by the output stage, which works like >>> a capacitance multiplier. >> >> Seems like an h-bridge switcher with good filtering would work. Or a >> single buck switcher with an outrageous filter and then a reversing >> switch downstream, SSRs maybe. Does having controlled gain in the >> linear stage help? > >The spurious spec is outrageously tight, though. It's the quietness of >the driver that's the selling point. (Very low BOM cost doesn't hurt >either.) The downside is that there are a fair number of parts. > >> You could do a switcher-based control loop and literally add your >> c-multiplier filters, which would only lose one or two jd's. > >Yup. I'm using some super-low V_CEsat transistors (ZXTN25020), and have >a higher voltage supply available, so I don't even lose the whole >junction drop. > >One consideration is that this is actually a customization of an >existing design, so the NRE budget isn't lush and there's licensing >revenue as an upside. > >Cheers > >Phil HobbsIs RMS noise the issue, or spectral lines? Spread-spectrum (ie, cheating) would help the latter. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●August 9, 20182018-08-09
On 08/09/2018 11:47 AM, John Larkin wrote: >On Thu, 9 Aug 2018 09:19:31 -0400, Phil Hobbs wrote: <snip>>> The TEC is a very low-Z load, but its potentially large thermocouple >> voltage makes it a four-quadrant device. > It that only a transient condition?The thermocouple voltage fights you, so it's a steady-state condition when you're running at large delta-T. It can be a good couple of volts depending on the number of junctions in the TEC.> > I remember, from way too long ago, some PNPs that had high Vbe > breakdown. 2N2906 maybe? The data sheets say 5 volts, but they are > probably just playing it safe.Probably, but you know how I hate midnight phone calls. ;) I just increased the drive resistance (which I can do since the Sziklai effectively has a beta of about 50000) and stuck in a BAV99W from base to emitter. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Reply by ●August 9, 20182018-08-09
On 08/09/2018 12:27 PM, John Larkin wrote:> On Thu, 9 Aug 2018 12:21:22 -0400, Phil Hobbs > <pcdhSpamMeSenseless@electrooptical.net> wrote: > >> On 08/09/2018 11:47 AM, John Larkin wrote: >>> On Thu, 9 Aug 2018 09:19:31 -0400, Phil Hobbs >>> <pcdhSpamMeSenseless@electrooptical.net> wrote: >>> >>>> On 08/09/2018 07:49 AM, Steve Wilson wrote: >>>>> On Wednesday, August 8, 2018 at 7:59:30 PM UTC-4, Phil Hobbs wrote: >>>>>> I'm doing a Class G driver for a thermoelectric cooler. (I don't want >>>>>> to use Class D because of the switching trash--with Class G it's a lot >>>>>> easier to get good filtering in a small space.) >>>>>> >>>>>> One issue is that the power supply on the Class G will be only a few >>>>>> volts, and the control electronics is running on +12, so it's easy to >>>>>> zener the BE junctions of various transistors. >>>>>> >>>>>> The 2SD2704K is a superbeta NPN with a BV_EBO of 25V, which is great, >>>>>> but there seems to be no PNP that gets anywhere close to that. I can >>>>>> protect the PNPs with diodes, but that's inelegant--I'd much rather have >>>>>> a PNP that can take 10V B-E. >>>>>> >>>>>> Any faves? >>>>>> >>>>>> Cheers >>>>>> >>>>>> Phil Hobbs >>>> >>>>> Your circuit arrangement is not clear. According to TI, class G is simply complimentary emitter followers with switched supply voltages. For example, see >>>>> >>>>> PowerWise?< Class G versus Class AB Headphone Amplifiers >>>>> >>>>> Figure 3. Basic Class G Design Using Split-Supply Class AB Output Stage >>>>> >>>>> Figure 4. Music Output Example >>>>> >>>>> http://www.ti.com/lit/an/snaa128/snaa128.pdf >>>>> >>>>> In this application, the transistors can never be reverse biased more than half a volt or so. >>>>> >>>>> Your application is completely different. You are not amplifying music, you are supplying power to a resistive load. Why do you need a PNP, and why can it be reverse biased by 12V? >>>>> >>>>> Please explain!! >>>>> >>>> >>>> I'd post the circuit except that it's a customer job. The topology is >>>> an asymmetrical bridge. One side is a current conveyor with a gain of >>>> about 500, and the other is a normal emitter follower totem pole >>>> arranged to keep the outputs symmetrical about VCC/2. It has to be >>>> pretty small, so there's no space for thermal pours. >>>> >>>> The TEC is a very low-Z load, but its potentially large thermocouple >>>> voltage makes it a four-quadrant device. >>> >>> It that only a transient condition? >>> >>> I remember, from way too long ago, some PNPs that had high Vbe >>> breakdown. 2N2906 maybe? The data sheets say 5 volts, but they are >>> probably just playing it safe. >>> >>> >>> >>> >>> >>> >>> That means that a fixed supply >>>> voltage for the driver requires a lot of headroom, which leads to a lot >>>> of dissipation most of the time. So fixed supplies are out. >>>> >>>> A Class D amplifier uses one or sometimes two PWM outputs with LC >>>> filters. In small audio amps, the speaker's inductance is often enough >>>> to work with, so you can get away with no filter at all. The hash this >>>> generates is a real problem with TECs, because there's a lot of >>>> capacitance between the TEC elements and the cold plate, so the hash >>>> gets into the diode laser bias and causes spurs. >>>> >>>> In Class G, you use an agile switching power supply and a linear output >>>> stage. That way you can keep the dissipation low while preserving the >>>> naturally good filtering provided by the output stage, which works like >>>> a capacitance multiplier. >>> >>> Seems like an h-bridge switcher with good filtering would work. Or a >>> single buck switcher with an outrageous filter and then a reversing >>> switch downstream, SSRs maybe. Does having controlled gain in the >>> linear stage help? >> >> The spurious spec is outrageously tight, though. It's the quietness of >> the driver that's the selling point. (Very low BOM cost doesn't hurt >> either.) The downside is that there are a fair number of parts. >> >>> You could do a switcher-based control loop and literally add your >>> c-multiplier filters, which would only lose one or two jd's. >> >> Yup. I'm using some super-low V_CEsat transistors (ZXTN25020), and have >> a higher voltage supply available, so I don't even lose the whole >> junction drop. >> >> One consideration is that this is actually a customization of an >> existing design, so the NRE budget isn't lush and there's licensing >> revenue as an upside. >> >> Cheers >> >> Phil Hobbs > > Is RMS noise the issue, or spectral lines? Spread-spectrum (ie, > cheating) would help the latter. > >Both. This driver is about 30 dB quieter than any commercial one I know of. The spread-spectrum thing would probably help, but I only get one crack at this. New SMPS chips always require a bit of assing around with, because they're all individuals. I should try doing a SS switcher sometime when things calm down a bit. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Reply by ●August 9, 20182018-08-09
On Thu, 9 Aug 2018 12:31:57 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>On 08/09/2018 12:27 PM, John Larkin wrote: >> On Thu, 9 Aug 2018 12:21:22 -0400, Phil Hobbs >> <pcdhSpamMeSenseless@electrooptical.net> wrote: >> >>> On 08/09/2018 11:47 AM, John Larkin wrote: >>>> On Thu, 9 Aug 2018 09:19:31 -0400, Phil Hobbs >>>> <pcdhSpamMeSenseless@electrooptical.net> wrote: >>>> >>>>> On 08/09/2018 07:49 AM, Steve Wilson wrote: >>>>>> On Wednesday, August 8, 2018 at 7:59:30 PM UTC-4, Phil Hobbs wrote: >>>>>>> I'm doing a Class G driver for a thermoelectric cooler. (I don't want >>>>>>> to use Class D because of the switching trash--with Class G it's a lot >>>>>>> easier to get good filtering in a small space.) >>>>>>> >>>>>>> One issue is that the power supply on the Class G will be only a few >>>>>>> volts, and the control electronics is running on +12, so it's easy to >>>>>>> zener the BE junctions of various transistors. >>>>>>> >>>>>>> The 2SD2704K is a superbeta NPN with a BV_EBO of 25V, which is great, >>>>>>> but there seems to be no PNP that gets anywhere close to that. I can >>>>>>> protect the PNPs with diodes, but that's inelegant--I'd much rather have >>>>>>> a PNP that can take 10V B-E. >>>>>>> >>>>>>> Any faves? >>>>>>> >>>>>>> Cheers >>>>>>> >>>>>>> Phil Hobbs >>>>> >>>>>> Your circuit arrangement is not clear. According to TI, class G is simply complimentary emitter followers with switched supply voltages. For example, see >>>>>> >>>>>> PowerWise?< Class G versus Class AB Headphone Amplifiers >>>>>> >>>>>> Figure 3. Basic Class G Design Using Split-Supply Class AB Output Stage >>>>>> >>>>>> Figure 4. Music Output Example >>>>>> >>>>>> http://www.ti.com/lit/an/snaa128/snaa128.pdf >>>>>> >>>>>> In this application, the transistors can never be reverse biased more than half a volt or so. >>>>>> >>>>>> Your application is completely different. You are not amplifying music, you are supplying power to a resistive load. Why do you need a PNP, and why can it be reverse biased by 12V? >>>>>> >>>>>> Please explain!! >>>>>> >>>>> >>>>> I'd post the circuit except that it's a customer job. The topology is >>>>> an asymmetrical bridge. One side is a current conveyor with a gain of >>>>> about 500, and the other is a normal emitter follower totem pole >>>>> arranged to keep the outputs symmetrical about VCC/2. It has to be >>>>> pretty small, so there's no space for thermal pours. >>>>> >>>>> The TEC is a very low-Z load, but its potentially large thermocouple >>>>> voltage makes it a four-quadrant device. >>>> >>>> It that only a transient condition? >>>> >>>> I remember, from way too long ago, some PNPs that had high Vbe >>>> breakdown. 2N2906 maybe? The data sheets say 5 volts, but they are >>>> probably just playing it safe. >>>> >>>> >>>> >>>> >>>> >>>> >>>> That means that a fixed supply >>>>> voltage for the driver requires a lot of headroom, which leads to a lot >>>>> of dissipation most of the time. So fixed supplies are out. >>>>> >>>>> A Class D amplifier uses one or sometimes two PWM outputs with LC >>>>> filters. In small audio amps, the speaker's inductance is often enough >>>>> to work with, so you can get away with no filter at all. The hash this >>>>> generates is a real problem with TECs, because there's a lot of >>>>> capacitance between the TEC elements and the cold plate, so the hash >>>>> gets into the diode laser bias and causes spurs. >>>>> >>>>> In Class G, you use an agile switching power supply and a linear output >>>>> stage. That way you can keep the dissipation low while preserving the >>>>> naturally good filtering provided by the output stage, which works like >>>>> a capacitance multiplier. >>>> >>>> Seems like an h-bridge switcher with good filtering would work. Or a >>>> single buck switcher with an outrageous filter and then a reversing >>>> switch downstream, SSRs maybe. Does having controlled gain in the >>>> linear stage help? >>> >>> The spurious spec is outrageously tight, though. It's the quietness of >>> the driver that's the selling point. (Very low BOM cost doesn't hurt >>> either.) The downside is that there are a fair number of parts. >>> >>>> You could do a switcher-based control loop and literally add your >>>> c-multiplier filters, which would only lose one or two jd's. >>> >>> Yup. I'm using some super-low V_CEsat transistors (ZXTN25020), and have >>> a higher voltage supply available, so I don't even lose the whole >>> junction drop. >>> >>> One consideration is that this is actually a customization of an >>> existing design, so the NRE budget isn't lush and there's licensing >>> revenue as an upside. >>> >>> Cheers >>> >>> Phil Hobbs >> >> Is RMS noise the issue, or spectral lines? Spread-spectrum (ie, >> cheating) would help the latter. >> >> > >Both. This driver is about 30 dB quieter than any commercial one I know >of. The spread-spectrum thing would probably help, but I only get one >crack at this. New SMPS chips always require a bit of assing around >with, because they're all individuals. > >I should try doing a SS switcher sometime when things calm down a bit. > >Cheers > >Phil HobbsI like TPS54302 lately. It's well behaved. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●August 9, 20182018-08-09
On Wednesday, August 8, 2018 at 4:59:30 PM UTC-7, Phil Hobbs wrote:> I'm doing a Class G driver... > One issue is that the power supply on the Class G will be only a few > volts, and the control electronics is running on +12, so it's easy to > zener the BE junctions of various transistors. > > The 2SD2704K is a superbeta NPN with a BV_EBO of 25V, which is great, > but there seems to be no PNP that gets anywhere close to that.The old germanium standby for PNP chopper/oscillator use (which similarly benefits from high BE breakdowns) was 2N404. Fast-forward half a century, and its descendant is CMPT404A, 'PNP Silicon chopper transistor' VEBO is 25V; Mouser has a few thousand in stock. Search engines don't do much good on the more obscure qualities one sometimes wants... I found this one by playing a hunch that the old part number would be echoed in its replacement. That was a sound marketing ploy: the part CAN be found that way.
Reply by ●August 9, 20182018-08-09
"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message news:jbWdnSWO4beK8fHGnZ2dnUU7-KudnZ2d@supernews.com...> Both. This driver is about 30 dB quieter than any commercial one I know > of. The spread-spectrum thing would probably help, but I only get one > crack at this. New SMPS chips always require a bit of assing around with, > because they're all individuals. > > I should try doing a SS switcher sometime when things calm down a bit.I recently did a 250W (total combined capacity) PSU with under 40dBuV noise (300kHz RBW, 20-300MHz). Just stock parts, solid ground planes, and some extra filtering on the input and outputs. Nothing very special I suppose, but the customer isn't seeing any trash in their ADCs/DACs/FPGAs, so we're happy. To do much better I think would require sacrificing efficiency and/or adding shields. Your application would probably be reasonable in <= 2 in^2 board area, ballpark. Don't know if that would be usable or attractive here. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website: https://www.seventransistorlabs.com/
Reply by ●August 9, 20182018-08-09
On 08/09/2018 03:01 PM, whit3rd wrote:> On Wednesday, August 8, 2018 at 4:59:30 PM UTC-7, Phil Hobbs wrote: >> I'm doing a Class G driver... >> One issue is that the power supply on the Class G will be only a few >> volts, and the control electronics is running on +12, so it's easy to >> zener the BE junctions of various transistors. >> >> The 2SD2704K is a superbeta NPN with a BV_EBO of 25V, which is great, >> but there seems to be no PNP that gets anywhere close to that. > > The old germanium standby for PNP chopper/oscillator use (which similarly > benefits from high BE breakdowns) was 2N404. Fast-forward half a > century, and its descendant is CMPT404A, 'PNP Silicon chopper transistor' > > VEBO is 25V; Mouser has a few thousand in stock. > > Search engines don't do much good on the more obscure qualities one > sometimes wants... I found this one by playing a hunch that > the old part number would be echoed in its replacement. That was > a sound marketing ploy: the part CAN be found that way. >Interesting, thanks. That's by far the closest so far. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Reply by ●August 14, 20182018-08-14
On Wed, 8 Aug 2018 20:01:05 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>I'm doing a Class G driver for a thermoelectric cooler. (I don't want >to use Class D because of the switching trash--with Class G it's a lot >easier to get good filtering in a small space.) > >One issue is that the power supply on the Class G will be only a few >volts, and the control electronics is running on +12, so it's easy to >zener the BE junctions of various transistors. > >The 2SD2704K is a superbeta NPN with a BV_EBO of 25V, which is great, >but there seems to be no PNP that gets anywhere close to that. I can >protect the PNPs with diodes, but that's inelegant--I'd much rather have >a PNP that can take 10V B-E. > >Any faves? > >Cheers > >Phil HobbsThis used to be more popular in chopper applications. Consulting the bipolar database and restricting to smd parts, I see: 2SB1053 Si pnp 200mW 40V - 12V 100mA 125>C - - 200T MAT SOT23 TO236 (SC59) LLG 2Q BC856 - - 2SB902 Si pnp 200mW 30V 25V 15V 100mA 125>C 150MHzT 4T 120/650 MAT SC59 minimold VLLC 1C BC856 2N5373 KT3107G 2SB1189 Si pnp 2W 80V 80V 10V 700mA 150>C 100MHzT 14T 82/390 ROH SC62 SOT89 MPT3 VMMM BD BCX53 2N6730 KT639E 2SB736 2SB1198 Si pnp 500mW 80V - 12V 500mA 125>C 50MHz - 200T TOS SOT23 TO236 RMMM AK BCX42 2N5374 KT632B 2SB789 2SB1693 Si pnp 200mW 40V 20V 15V 500mA 150>C 170MHzT 16T 100/560 MAT SC59 mini3G1 VLMA 3D - - - BT404 Si pnp 225mW 25V 24V 12V 150mA 150>C - 20 30/400 CZH SOT23 LLG 2M - - - CPH6520 Si pnpdual 350mW 30V 25V 15V 150mA 150>C 210MHzT 2.6T 500/1200 SAN SOT23-6 SOT457 CP6 VLLNdual 3G - - - FC139 Si pnp 300mW 60V 50V 15V 100mA 150>C 200MHzT 1.5T 800/3200 SAN SOT23-6 SOT457 CP6 VLLMAdual 139 - - - FC149 Si pnp 300mW 30V 25V 15V 150mA 150>C 210MHzT 2.6T 500/1200 SAN SOT23-6 SOT457 CP6 VLLAdual 149 - - - KT216A Si pnp 75mW 60V 60V 30V 10mA 150>C 25MHz 10 9/50 ELO SOT23 TO236-1 RLLM * - - - KT218A9 Si pnp 200mW 80V 80V 30V 50mA 125>C 5MHz 15 20MIN ELO SOT23 TO236-1 LLM * - - - KT218E9 Si pnp 200mW 20V - 20V 50mA 125>C 5MHz 15 40MIN ELO SOT23 TO236-1 LLG * - - - MMBT404 Si pnp 350mW 25V 24V 12V 150mA 150>C - 20 30/400 MOT SOT23 TO236 LLC 2M - - - RL
Reply by ●August 14, 20182018-08-14
On Tuesday, 14 August 2018 05:07:40 UTC+1, legg wrote:> This used to be more popular in chopper applications. > > Consulting the bipolar database and restricting to smd parts, I see: > > 2SB1053 Si pnp 200mW 40V - 12V 100mA 125>C > - - 200T MAT SOT23 TO236 (SC59) LLG 2Q > BC856 - - > 2SB902 Si pnp 200mW 30V 25V 15V 100mA 125>C > 150MHzT 4T 120/650 MAT SC59 minimold VLLC 1C BC856 > 2N5373 KT3107G > 2SB1189 Si pnp 2W 80V 80V 10V 700mA 150>C > 100MHzT 14T 82/390 ROH SC62 SOT89 MPT3 VMMM BD BCX53 > 2N6730 KT639E 2SB736 > 2SB1198 Si pnp 500mW 80V - 12V 500mA 125>C > 50MHz - 200T TOS SOT23 TO236 RMMM AK BCX42 > 2N5374 KT632B 2SB789 > 2SB1693 Si pnp 200mW 40V 20V 15V 500mA 150>C > 170MHzT 16T 100/560 MAT SC59 mini3G1 VLMA 3D - - > - > BT404 Si pnp 225mW 25V 24V 12V 150mA 150>C > - 20 30/400 CZH SOT23 LLG 2M - - - > CPH6520 Si pnpdual 350mW 30V 25V 15V 150mA 150>C > 210MHzT 2.6T 500/1200 SAN SOT23-6 SOT457 CP6 VLLNdual > 3G - - - > FC139 Si pnp 300mW 60V 50V 15V 100mA 150>C > 200MHzT 1.5T 800/3200 SAN SOT23-6 SOT457 CP6 VLLMAdual > 139 - - - > FC149 Si pnp 300mW 30V 25V 15V 150mA 150>C > 210MHzT 2.6T 500/1200 SAN SOT23-6 SOT457 CP6 VLLAdual > 149 - - - > KT216A Si pnp 75mW 60V 60V 30V 10mA 150>C > 25MHz 10 9/50 ELO SOT23 TO236-1 RLLM * - - > - > KT218A9 Si pnp 200mW 80V 80V 30V 50mA 125>C > 5MHz 15 20MIN ELO SOT23 TO236-1 LLM * - - > - > KT218E9 Si pnp 200mW 20V - 20V 50mA 125>C > 5MHz 15 40MIN ELO SOT23 TO236-1 LLG * - - > - > MMBT404 Si pnp 350mW 25V 24V 12V 150mA 150>C > - 20 30/400 MOT SOT23 TO236 LLC 2M - - > - > > > RLthat table is well scrambled :/ NT
