IRFP240 problem

[Cephas]

i ve bought 2 box of IRFP240 (25pcsX2box)
just need less then $1USdollar /each

have any body knows the digit's meaning on the fet below the IR logo?? meaningless?

IRFP240
I R
0P2N 9017 <---

thanks!

 

[Joe Berry]

The first four digits are the lot code, which I don't know how to decipher, except that multiple devices with the same lot code were fabricated at the same time, possibly from the same wafer.

The last four digits are the date code in YYWW (year year week week) format. For example, the code 9017 indicates that the part was made during the 17th week of 1990.

 

[yasalam]

Less than 1 US dollar each!!
Where did you get it?

Thanks.
Yamin

 

[Cephas]

yes.
i bought it from China.
$6 RMB for 1pcs
$8 RMB is about $1USD

 

[kimarin]

IEFP240

Do you have an URL or an adress to where you bought them??

 

[Cephas]

I live in Hong Kong.
so i go back to China on Sunday
not by Maill

but in China the Price also wide
IRFP 240 some shop need $24 RMB/pcs
but always is about $7 - 12

and some are not IR's product(Harris)

 

[HarryHaller]

Harris mosfets

Harris mosfets are excellent also and I would not hesitate using them.

H.H.

 

[mlloyd1]

$1 us each? This price sounds too good to be true!
Perhaps it's just me, but I'd be worried about these devices being counterfit. Can you check them on a curve tracer?

mlloyd1

i ve bought 2 box of IRFP240 (25pcsX2box)
just need less then $1USdollar /each
....
thanks!

 

[Cephas]

i worry too but the price is really good.
so i just buy 50 pcs
who knows how to check them??
i haven't curve tracer
how to check them?
i don't buy the harris cos them easy to be fake.

 

[albertho]

The price is very cheap. It's almost double the price in Hong Kong. Could you kindly tell me where you bought it in PRC. Probably it's in ShenZhen, I guest. Preferrable provide me with detail address.
Thank you very much for your assistance.

 

[albertho]

I want it too!

The price is really cheap. It's almost double the price in Hong Kong. Could you kindly tell me where you bought it in PRC. Probably it's in ShenZhen, I guest. Preferrable provide me with detail address.
Thank you very much for your assistance.

 

[mpopovics]

who knows how to check them??
i haven't curve tracer
how to check them?

Hello Cephas!
You can search for 'matching' or 'matching FETs'.
Few threads available about the mathcing FETs, with very detailed description.
Also Mr. Pass mentioned the method in some thread.
BR,

 

[swede]

Matching mosfets is described in the A75 (part2) article found on http://www.passdiy.com/legacy.htm

Here it is:
http://www.passdiy.com/pdf/a75p2.pdf

Best regards,
//magnus

 

[promitheus]

I have also used the Harris Mosfets from 'Intersil and I can say they are very good.

 

[Nelson Pass]

I say: Load them in, and fire it up!

 

[Bill Fitzpatrick]

I was wondering what everyone thinks, especially NP, about the 2SC5200 and 2SA1943 output pairs.

 

[AudioFreak]

I was wondering what everyone thinks, especially NP, about the 2SC5200 and 2SA1943 output pairs.

As far as BJT's go, they are some of the most linear devices available but they are not very rugged.

 

[Cephas]

Hi albert.

sorry to reply late
yes i bought them in ShenZhen.
i think may be NOS so the price is cheaper
and the shop just have 75pcs.

 

[Cephas]

below is the test result
in execl file

 

[albertho]

Dear Cephas,
Thank you for your kind response.
I think it's worth for me to visit ShenZhen someday to shop for diy components. Do you have any information regarding the shop(s) or the shopping mall etc.
Thanks