Fairchild interest.

BFNY · 2012-03-20 5:37 pm

labjr said:
Where did you get them from?

Bought them a while ago, at either Mouser or Online Components.

buzzforb · 2012-03-20 6:04 pm

Be mindful of the one on the right. Haven't seen one like this. It is possible it is later production, and if you got it from mouser I would t worry. Tseting them is tough unless your willing to go to some trouble.

Bksabath · 2012-03-20 6:08 pm

A) why P type as is a N ?
B) maybe different batch or even factory how the VGS compare like?

BFNY · 2012-03-20 6:15 pm

buzzforb said:
Be mindful of the one on the right. Haven't seen one like this. It is possible it is later production, and if you got it from mouser I would t worry. Tseting them is tough unless your willing to go to some trouble.

OK, thanks
Left one is from Mouser, right one is from here - I see they still list them, P only

FQA12P20 FAIRCHILD is in stock | Buy FQA12P20 | Onlinecomponents.com

jacco vermeulen · 2012-03-20 7:17 pm

Dudes,

top line on the devices starts with F for Fairchild, next one is the plant code, then manufacturing period/date, blah blah blah.
Aka the left one is manufactured in Thailand, right one in China.

Oldy, but still amusing, B for....

buzzforb · 2012-03-20 7:44 pm

Thanks for the helpful info Jacco. As Tea said, the easiest way to check is to go through Fairchild customer service. If that fails send all PM's to Jacco for info;D

ra7 · 2012-03-20 7:55 pm

I have had bad 2sk170s from Mouser before. They were BL grade and yet Idss was all over the place - from 3mA to 20 mA. Couldn't say if they were fake, they work in circuits... could be rejects.

Daniel(Del) · 2012-03-20 8:19 pm

Approximately, are 2 octuplets going to be much more expensive then 4 quads? Maybe it's worth it...

labjr · 2012-03-20 8:22 pm

ra7 said:
I have had bad 2sk170s from Mouser before. They were BL grade and yet Idss was all over the place - from 3mA to 20 mA. Couldn't say if they were fake, they work in circuits... could be rejects.

I've heard of fakes getting into the distribution chain and sold by authorized distributors. I'm not sure how it happens though. You'd think that wouldn't be possible.

buzzforb · 2012-03-20 8:26 pm

If matching is good, quads should run at $4/fet and octuplets around $6/fet. It is possible that octuplets are hard to come by and if so, the price may be higher. At this point, it all speculation. Being that they are from unopened boxes, I am hoping for good matching. I am thinking 1-2 month match time. If it is going slow, I will ramp up matching setup. They will be matched on large heatsinks using DiyAudio store spacing, as this is a probable setup for then in their final resting space. I want to try to match in groups vs singles, as it is my belief that this will yield more reliable results.

labjr · 2012-03-20 8:43 pm

BFNY said:
Does anyone have examples of P fakes for these parts? I have 2 different looking P types here, is that normal? Both look pretty good. On one the F and print is larger.

The ones I have look like the one on the right. They came from an authorized distributor. But the ones in the real F5 look like the one on the left. So I'd say they're both genuine.

njgale · 2012-03-20 8:56 pm

Just added myself to the s/sheet for 1 x quad set please.

Be interested to know how the matching process works - never done anything like that before and haven't managed to find a description on the forum yet.

Cheers

Nick

pddjsteve · 2012-03-20 9:11 pm

De-lurking to add myself to the interest list - a V2 is most definitely in my future.

njgale · 2012-03-20 9:18 pm

njgale said:
Be interested to know how the matching process works - never done anything like that before and haven't managed to find a description on the forum yet.

Cheers

Nick

Oops - just found I can search thread titles only, via advanced search, and got some threads to read

Apols for the noise

BFNY · 2012-03-21 3:53 am

labjr said:
The ones I have look like the one on the right. They came from an authorized distributor. But the ones in the real F5 look like the one on the left. So I'd say they're both genuine.

Many thanks to all for the input on fakes. I have 60 or so of the ones on the right, so really glad the outcome is that they look OK.

I've bought and seen fakes before, 2SK170s from MCM Electronics, with poor printing and poor measurements, and these didn't seem to be like that.
Mucho appreciato :sax:

labjr · 2012-03-21 11:57 am

BFNY said:
Many thanks to all for the input on fakes. I have 60 or so of the ones on the right, so really glad the outcome is that they look OK.

I've bought and seen fakes before, 2SK170s from MCM Electronics, with poor printing and poor measurements, and these didn't seem to be like that.
Mucho appreciato

I wonder how MCM got the fakes? Did they go outside the normal distribution chain?

pcb121055 · 2012-03-21 5:35 pm

Hi guys. New to the show. but this F5T build sounds like way too much fun. I put myself on the spreadsheet for 4 quads as I will build 4 channels in F5TV3 form. Fantastic effort. Thanks!

buzzforb · 2012-03-21 7:01 pm

More Candy!. I guess i have to start working now.

jam · 2012-03-21 7:30 pm

jacco,

.................I see you are re-cycling my old cartoons, watch that you do not get into trouble with the moderators.

Jam

jacco vermeulen · 2012-03-21 7:35 pm

Darth Jam,

after your early cartoon retirement, i have no option but to terminate myself.

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