Fake chips tda2050

pra3718 · 17th February 2010, 03:26 PM

How to identify original tda2050 chips. Where I should buy original in india ?

kuldeepsingh · 17th February 2010, 03:36 PM

difficult to identify. But check its by ST (sgs thompson) , st sign will be there on top, cost will be around 45-50/- Rs. and its very easily available.

sexya · 17th February 2010, 03:58 PM

there are lots of fake in markt with , st written on it. then there are some with on top left and on bottom right you will find "e 3" written in a circle but one thing to look for is a sort type on it wiht non curve letters ,that should be original and the pins shouldnt be in a step on the edge,i do have a pic of a ( i think fake TDA2050 ) have a look

pra3718 · 18th February 2010, 08:54 AM

Believe, I build more than 15 chips. Only two chips are sounding. Problem is DC at output & no sound. I don't think it's my fault. I build several tda2030a and got success. At my city tda2050 cost around Rs.28.00-30.00 Tda2030a is available for Rs.15.00

Quote:

st written on it. then there are some with on top left and on bottom right

that's right.

Can you post a picture for original tda2050 which is available in local indian market.

Thanks & Best Regards.

pra3718 · 18th February 2010, 08:57 AM

One more thing, I found some chips with bend pins & some of straight pins.

kuldeepsingh · 10:28 AM

2 out of 15

. i had 2 out of 6 @ 45 per IC. i was fed up after that and ordered 3886 samples from NS. (all samples were working ). for TDA2050 i had made a test circuit with an ic connector in place of chip, then i tested each ic in the same board one-by-one, (& only 2 out of 6 worked)

pra3718 · 18th February 2010, 10:33 AM

How did you order 3886 samples from NS Pl. describe in detail.

johnr66 · 18th February 2010, 12:56 PM

I bought some TDA2040 chips off ebay once. Plugged one into a known good circuit and it was DC out (no audio). Plug in another and it was fine. I contacted the seller and told him I got a bad one. He resisted, but sent me a replacement chip and it was good.

I can't tell if they are fakes, but I noticed the leads are not as wide where they enter the case as the other ones I have.

I now buy my parts from Digikey. Price is reasonable.

kuldeepsingh · 18th February 2010, 01:12 PM

Quote:

Originally Posted by pra3718

How did you order 3886 samples from NS Pl. describe in detail.

you make a login account on National semiconductor, better use some company email id or collage /univ id. After ur account is created, u can get 5 samples of any IC but subjected to availability only. And u have to bear shipping chaeges which is around 8-16$ depending on number of samples.
giv a try .

pra3718 · 18th February 2010, 03:01 PM

Thank you Kuldeep. Bull still looking any NATIONAL authorized distributor in india.

17th February 2010, 03:26 PM	#1
pra3718 diyAudio Member Join Date: Jan 2009	Fake chips tda2050 How to identify original tda2050 chips. Where I should buy original in india ?

17th February 2010, 03:36 PM	#2
kuldeepsingh diyAudio Member Join Date: Aug 2006 Location: Chennai, India	difficult to identify. But check its by ST (sgs thompson) , st sign will be there on top, cost will be around 45-50/- Rs. and its very easily available. __________________ . . .. ... ..... ........ ............. ..................... .................................. My Best LM3886 PCB layout

18th February 2010, 10:25 AM	#6
kuldeepsingh diyAudio Member Join Date: Aug 2006 Location: Chennai, India	2 out of 15 . i had 2 out of 6 @ 45 per IC. i was fed up after that and ordered 3886 samples from NS. (all samples were working ). for TDA2050 i had made a test circuit with an ic connector in place of chip, then i tested each ic in the same board one-by-one, (& only 2 out of 6 worked) __________________ . . .. ... ..... ........ ............. ..................... .................................. My Best LM3886 PCB layout Last edited by kuldeepsingh; 18th February 2010 at 10:28 AM.

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17th February 2010, 03:58 PM	#3
sexya diyAudio Member Join Date: Jun 2007 Location: Bombay/India	there are lots of fake in markt with , st written on it. then there are some with on top left and on bottom right you will find "e 3" written in a circle but one thing to look for is a sort type on it wiht non curve letters ,that should be original and the pins shouldnt be in a step on the edge,i do have a pic of a ( i think fake TDA2050 ) have a look

18th February 2010, 08:57 AM	#5
pra3718 diyAudio Member Join Date: Jan 2009	One more thing, I found some chips with bend pins & some of straight pins.

18th February 2010, 10:33 AM	#7
pra3718 diyAudio Member Join Date: Jan 2009	How did you order 3886 samples from NS Pl. describe in detail.

18th February 2010, 12:56 PM	#8
johnr66 diyAudio Member Join Date: Mar 2009	I bought some TDA2040 chips off ebay once. Plugged one into a known good circuit and it was DC out (no audio). Plug in another and it was fine. I contacted the seller and told him I got a bad one. He resisted, but sent me a replacement chip and it was good. I can't tell if they are fakes, but I noticed the leads are not as wide where they enter the case as the other ones I have. I now buy my parts from Digikey. Price is reasonable.

18th February 2010, 03:01 PM	#10
pra3718 diyAudio Member Join Date: Jan 2009	Thank you Kuldeep. Bull still looking any NATIONAL authorized distributor in india.

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