John S wrote...> >On 3/22/2017 1:03 PM, rickman wrote: >> On 3/22/2017 10:36 AM, John S wrote: >>> On 3/19/2017 11:34 PM, rickman wrote: >>>> I was looking to order some low current MOSFETs and realized all the >>>> popular items had thresholds of 3 volts and higher. I would like to use >>>> something that turns on pretty well at 3 volts so it won't need a 5 volt >>>> PSU. Any suggestions? I'm looking for a TO-92 case preferably but >>>> surface mount will be ok too. >>>> >>>> I could have sworn some years ago I tracked down a number of low >>>> threshold voltage FETs. But maybe those devices operated under 5 volts >>>> rather than under 3.3 volts. >>>> >>> >>> We have been very happy with the FDN337N. >> >> I was checking this out and found the prices are >$0.20 even on ebay >> buying 50 or more. Then I checked aliexpress and found this one... >> >> https://www.aliexpress.com/item >> >> $2.80 for 100 with free shipping! I would say that have to be fakes, >> but this store has been online for 3 years with 100%. How can they do >> that? > >Don't know. I just discovered that the FDN337N is unobtanium for the >next couple of months or more. That prompted me to find a substitute >which I have not yet singled out. We need something in the next week or >two. Crap!I have found aliexpress sellers to be very helpful. I'll bet they'll sell you lots of 100 and probably accept your request for next-day air shipping, if you pay for it in advance with a bank transfer. -- Thanks, - Win
Low Threshold MOSFET
Started by ●March 20, 2017
Reply by ●March 22, 20172017-03-22
Reply by ●March 22, 20172017-03-22
On 3/22/2017 2:43 PM, John S wrote:> On 3/22/2017 1:03 PM, rickman wrote: >> On 3/22/2017 10:36 AM, John S wrote: >>> On 3/19/2017 11:34 PM, rickman wrote: >>>> I was looking to order some low current MOSFETs and realized all the >>>> popular items had thresholds of 3 volts and higher. I would like to >>>> use >>>> something that turns on pretty well at 3 volts so it won't need a 5 >>>> volt >>>> PSU. Any suggestions? I'm looking for a TO-92 case preferably but >>>> surface mount will be ok too. >>>> >>>> I could have sworn some years ago I tracked down a number of low >>>> threshold voltage FETs. But maybe those devices operated under 5 volts >>>> rather than under 3.3 volts. >>>> >>> >>> We have been very happy with the FDN337N. >> >> I was checking this out and found the prices are >$0.20 even on ebay >> buying 50 or more. Then I checked aliexpress and found this one... >> >> https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 >> >> >> >> $2.80 for 100 with free shipping! I would say that have to be fakes, >> but this store has been online for 3 years with 100%. How can they do >> that? > > Don't know. I just discovered that the FDN337N is unobtanium for the > next couple of months or more. That prompted me to find a substitute > which I have not yet singled out. We need something in the next week or > two. Crap! > > Sorry about that.I already ordered from that vendor via the slow boat. I'll get then in April... maybe. This one is $0.09 each @100 and will ship via DHL or Fedex for $30+. It says roughly 1 to 2 weeks. If you really need them I don't think risking $40 is too big a deal is it? You can pay with credit card and I hear Aliexpress is pretty good about it if you find the parts are crap. I've only needed to dispute something that I didn't receive once and it was not a big hassle. No worse than eBay. https://www.aliexpress.com/item/Original-free-shipping-FDN337N-FDN337-SOT23-100PCS-LOT-in-Stock/32489003439.html?spm=2114.01010208.3.101.OhdFrg&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_price_asc&btsid=c9539a0f-5ed7-4e0a-847d-f67c46fbbebc&algo_expid=206fe663-46af-469f-a0d5-7157fad55716-12&algo_pvid=206fe663-46af-469f-a0d5-7157fad55716 -- Rick C
Reply by ●March 22, 20172017-03-22
On 3/22/2017 2:43 PM, John S wrote:> On 3/22/2017 1:03 PM, rickman wrote: >> On 3/22/2017 10:36 AM, John S wrote: >>> On 3/19/2017 11:34 PM, rickman wrote: >>>> I was looking to order some low current MOSFETs and realized all the >>>> popular items had thresholds of 3 volts and higher. I would like to >>>> use >>>> something that turns on pretty well at 3 volts so it won't need a 5 >>>> volt >>>> PSU. Any suggestions? I'm looking for a TO-92 case preferably but >>>> surface mount will be ok too. >>>> >>>> I could have sworn some years ago I tracked down a number of low >>>> threshold voltage FETs. But maybe those devices operated under 5 volts >>>> rather than under 3.3 volts. >>>> >>> >>> We have been very happy with the FDN337N. >> >> I was checking this out and found the prices are >$0.20 even on ebay >> buying 50 or more. Then I checked aliexpress and found this one... >> >> https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 >> >> >> >> $2.80 for 100 with free shipping! I would say that have to be fakes, >> but this store has been online for 3 years with 100%. How can they do >> that? > > Don't know. I just discovered that the FDN337N is unobtanium for the > next couple of months or more. That prompted me to find a substitute > which I have not yet singled out. We need something in the next week or > two. Crap! > > Sorry about that.This Aliexpress vendor is twice the price as the other one I mentioned, but has a Fedex delivery option for 5-8 days. It may result in Tom Hanks being stranded on a deserted island for years though. :( https://www.aliexpress.com/item/SMD-FET-FDN337N-FDN337-imprint-337-SOT23-original-spot/874807260.html?spm=2114.01010208.3.110.OhdFrg&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_price_asc&btsid=c9539a0f-5ed7-4e0a-847d-f67c46fbbebc&algo_expid=206fe663-46af-469f-a0d5-7157fad55716-13&algo_pvid=206fe663-46af-469f-a0d5-7157fad55716 -- Rick C
Reply by ●March 22, 20172017-03-22
On 3/22/2017 1:43 PM, John S wrote:> On 3/22/2017 1:03 PM, rickman wrote: >> On 3/22/2017 10:36 AM, John S wrote: >>> On 3/19/2017 11:34 PM, rickman wrote: >>>> I was looking to order some low current MOSFETs and realized all the >>>> popular items had thresholds of 3 volts and higher. I would like to >>>> use >>>> something that turns on pretty well at 3 volts so it won't need a 5 >>>> volt >>>> PSU. Any suggestions? I'm looking for a TO-92 case preferably but >>>> surface mount will be ok too. >>>> >>>> I could have sworn some years ago I tracked down a number of low >>>> threshold voltage FETs. But maybe those devices operated under 5 volts >>>> rather than under 3.3 volts. >>>> >>> >>> We have been very happy with the FDN337N. >> >> I was checking this out and found the prices are >$0.20 even on ebay >> buying 50 or more. Then I checked aliexpress and found this one... >> >> https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 >> >> >> >> $2.80 for 100 with free shipping! I would say that have to be fakes, >> but this store has been online for 3 years with 100%. How can they do >> that? > > Don't know. I just discovered that the FDN337N is unobtanium for the > next couple of months or more. That prompted me to find a substitute > which I have not yet singled out. We need something in the next week or > two. Crap! > > Sorry about that.I think I found a good substitute. It is the IRLML6344. Thanks for your suggestions, Guys.
Reply by ●March 23, 20172017-03-23
rickman wrote:> I was looking to order some low current MOSFETs and realized all the > popular items had thresholds of 3 volts and higher. I would like to use > something that turns on pretty well at 3 volts so it won't need a 5 volt > PSU. Any suggestions? I'm looking for a TO-92 case preferably but > surface mount will be ok too. > > I could have sworn some years ago I tracked down a number of low > threshold voltage FETs. But maybe those devices operated under 5 volts > rather than under 3.3 volts. >Lemme see..would a dual or quad N-channel ZERO threshold match pair array be useful? Also available at Vth = 0.2, 0.8, and 1,4V. Made by Advanced Linear Devices, carried by Mouser, (Oct 2006 catalog).
Reply by ●March 23, 20172017-03-23
On 2017-03-22 12:18, rickman wrote:> On 3/22/2017 2:43 PM, John S wrote: >> On 3/22/2017 1:03 PM, rickman wrote: >>> On 3/22/2017 10:36 AM, John S wrote: >>>> On 3/19/2017 11:34 PM, rickman wrote: >>>>> I was looking to order some low current MOSFETs and realized all the >>>>> popular items had thresholds of 3 volts and higher. I would like to >>>>> use >>>>> something that turns on pretty well at 3 volts so it won't need a 5 >>>>> volt >>>>> PSU. Any suggestions? I'm looking for a TO-92 case preferably but >>>>> surface mount will be ok too. >>>>> >>>>> I could have sworn some years ago I tracked down a number of low >>>>> threshold voltage FETs. But maybe those devices operated under 5 >>>>> volts >>>>> rather than under 3.3 volts. >>>>> >>>> >>>> We have been very happy with the FDN337N. >>> >>> I was checking this out and found the prices are >$0.20 even on ebay >>> buying 50 or more. Then I checked aliexpress and found this one... >>> >>> https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 >>> >>> >>> >>> >>> $2.80 for 100 with free shipping! I would say that have to be fakes, >>> but this store has been online for 3 years with 100%. How can they do >>> that? >> >> Don't know. I just discovered that the FDN337N is unobtanium for the >> next couple of months or more. That prompted me to find a substitute >> which I have not yet singled out. We need something in the next week or >> two. Crap! >> >> Sorry about that. > > This Aliexpress vendor is twice the price as the other one I mentioned, > but has a Fedex delivery option for 5-8 days. It may result in Tom > Hanks being stranded on a deserted island for years though. :( >But he has Wilson! [...] -- Regards, Joerg http://www.analogconsultants.com/
Reply by ●March 24, 20172017-03-24
On Wednesday, 22 March 2017 18:04:00 UTC, rickman wrote:> I was checking this out and found the prices are >$0.20 even on ebay > buying 50 or more. Then I checked aliexpress and found this one... > > https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 > > $2.80 for 100 with free shipping! I would say that have to be fakes, > but this store has been online for 3 years with 100%. How can they do > that?might be the genuine article but salvaged. Who knows. NT
Reply by ●March 24, 20172017-03-24
On 3/23/2017 11:45 PM, tabbypurr@gmail.com wrote:> On Wednesday, 22 March 2017 18:04:00 UTC, rickman wrote: > >> I was checking this out and found the prices are >$0.20 even on ebay >> buying 50 or more. Then I checked aliexpress and found this one... >> >> https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 >> >> $2.80 for 100 with free shipping! I would say that have to be fakes, >> but this store has been online for 3 years with 100%. How can they do >> that? > > might be the genuine article but salvaged. Who knows.It would be hard to sell salvaged as new. It would have solder on the leads. I don't know how they could even do the work to unsolder and repackage the parts for that price! I'll find out in a few weeks if there's no longshoreman's strike and customs doesn't seize anything. -- Rick C
Reply by ●March 24, 20172017-03-24
rickman wrote:> On 3/23/2017 11:45 PM, tabbypurr@gmail.com wrote: >> On Wednesday, 22 March 2017 18:04:00 UTC, rickman wrote: >> >>> I was checking this out and found the prices are >$0.20 even on ebay >>> buying 50 or more. Then I checked aliexpress and found this one... >>> >>> https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 >>> >>> >>> $2.80 for 100 with free shipping! I would say that have to be fakes, >>> but this store has been online for 3 years with 100%. How can they do >>> that? >> >> might be the genuine article but salvaged. Who knows. > > It would be hard to sell salvaged as new. It would have solder on the > leads. I don't know how they could even do the work to unsolder and > repackage the parts for that price! > > I'll find out in a few weeks if there's no longshoreman's strike and > customs doesn't seize anything. >You mean STEAL.
Reply by ●March 24, 20172017-03-24
On Friday, 24 March 2017 04:44:12 UTC, rickman wrote:> On 3/23/2017 11:45 PM, tabbypurr wrote: > > On Wednesday, 22 March 2017 18:04:00 UTC, rickman wrote: > > > >> I was checking this out and found the prices are >$0.20 even on ebay > >> buying 50 or more. Then I checked aliexpress and found this one... > >> > >> https://www.aliexpress.com/item/Free-shipping-100pcs-lot-FDN337N-screen-337-SOT-23-new-original/32718408974.html?spm=2114.01010208.3.18.ju58Ca&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10141_10056_10055_10054_301_10059_201_10531_10099_10530_129_10103_10102_10096_10052_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_13,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=bc963ea4-0cae-4be3-95ba-e5fa2d2485cc&algo_expid=5043bdd6-47a3-424c-a756-09e1cbb36cd7-2&algo_pvid=5043bdd6-47a3-424c-a756-09e1cbb36cd7 > >> > >> $2.80 for 100 with free shipping! I would say that have to be fakes, > >> but this store has been online for 3 years with 100%. How can they do > >> that? > > > > might be the genuine article but salvaged. Who knows. > > It would be hard to sell salvaged as new. It would have solder on the > leads. I don't know how they could even do the work to unsolder and > repackage the parts for that price! > > I'll find out in a few weeks if there's no longshoreman's strike and > customs doesn't seize anything.Not hard at all, it's done on a fair scale. NT
