On 2017-03-22 11:03, 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? >Often dealers or liquidators buy production remnant reels on the cheap. Some product was discontinued, a company has reels and partial reels left over and a regular distributor would not take anything back. Or maybe a little company went belly-up and the bankruptcy laywer sells everything but the kitchen sink. I have even bought software from liquidators, such as an older version of a 3D mechanical CAD package for $10. Yes, ten bucks. -- Regards, Joerg http://www.analogconsultants.com/
Low Threshold MOSFET
Started by ●March 20, 2017
Reply by ●March 24, 20172017-03-24
Reply by ●March 24, 20172017-03-24
On 3/24/2017 6:59 AM, tabbypurr@gmail.com wrote:> 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.What is done, selling salvage as new? Selling salvage may be done all the time, but I see pictures of people straightening pins with pliers over solder pots. I seriously doubt they can pass those parts as new and even though it may be cost effective for some parts, it would be rough to make much profit from $0.02 transistors after taping them. -- Rick C
Reply by ●March 25, 20172017-03-25
On Friday, 24 March 2017 16:50:59 UTC, rickman wrote:> On 3/24/2017 6:59 AM, tabbypurr wrote: > > 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. > > What is done, selling salvage as new? Selling salvage may be done all > the time, but I see pictures of people straightening pins with pliers > over solder pots. I seriously doubt they can pass those parts as new > and even though it may be cost effective for some parts, it would be > rough to make much profit from $0.02 transistors after taping them.Lots of salvage is sold as new in China. It's quite doable. In some places parts are processed in the street, literally. 3rd world wages aren't exactly high. Some stuff is sold without remarking, some is black-topped and remarked to make all the parts on a reel look the same. $2.80 less 65c shipping is $2.15 income for someone. In some places people work for as little as 8p per 16 hour day (about 12c) - I've no idea what the pay is for component salvage, but $2.15 a 100 is well within doable. Of course that doesn't mean that's what these particular items are, but there's lots of salvage going on. Decent salvage is all tested, the worst is re-marked wrong parts. NT
Reply by ●March 25, 20172017-03-25
On 2017-03-25 00:51, tabbypurr@gmail.com wrote:> On Friday, 24 March 2017 16:50:59 UTC, rickman wrote: >> On 3/24/2017 6:59 AM, tabbypurr wrote: >>> 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. >> >> What is done, selling salvage as new? Selling salvage may be done >> all the time, but I see pictures of people straightening pins with >> pliers over solder pots. I seriously doubt they can pass those >> parts as new and even though it may be cost effective for some >> parts, it would be rough to make much profit from $0.02 transistors >> after taping them. > > Lots of salvage is sold as new in China. It's quite doable. In some > places parts are processed in the street, literally.Sometimes when the side walk isn't large enough literally in the street: https://i0.wp.com/www.vagabondjourney.com/travelogue/wp-content/uploads/Broken-cellphones-in-Shenzhen.jpg?w=600 [...] -- Regards, Joerg http://www.analogconsultants.com/
Reply by ●March 25, 20172017-03-25
On 3/25/2017 3:51 AM, tabbypurr@gmail.com wrote:> On Friday, 24 March 2017 16:50:59 UTC, rickman wrote: >> On 3/24/2017 6:59 AM, tabbypurr wrote: >>> 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. >> >> What is done, selling salvage as new? Selling salvage may be done all >> the time, but I see pictures of people straightening pins with pliers >> over solder pots. I seriously doubt they can pass those parts as new >> and even though it may be cost effective for some parts, it would be >> rough to make much profit from $0.02 transistors after taping them. > > Lots of salvage is sold as new in China. It's quite doable. In some places parts are processed in the street, literally. 3rd world wages aren't exactly high. Some stuff is sold without remarking, some is black-topped and remarked to make all the parts on a reel look the same. > > $2.80 less 65c shipping is $2.15 income for someone. In some places people work for as little as 8p per 16 hour day (about 12c) - I've no idea what the pay is for component salvage, but $2.15 a 100 is well within doable. > > Of course that doesn't mean that's what these particular items are, but there's lots of salvage going on. Decent salvage is all tested, the worst is re-marked wrong parts.How can they restore the length of TO-92 leads? -- Rick C
