Is this a real TDA1541A?

pop11 · 20th April 2004, 08:35 AM

It does not have the "Philips" logo on it, is this real?

Please help

elib · 20th April 2004, 08:44 AM

It's at least a remarked one. I assume it's a TDA1541 of 1987.

jean-paul · 20th April 2004, 08:47 AM

That sure is a remarked one.

pop11 · 20th April 2004, 08:53 AM

So it is a fake? Or just remark of a normal TDA1541A?

Bricolo · 20th April 2004, 08:58 AM

What do you mean by "remarqued" ?
-a fake chip with 1541 written on it
-a genuine 1541, but with new writing on it (why?)

And it it's solution 2, the marking date becomes the production date? That's odd!

Andypairo · 20th April 2004, 09:10 AM

Quote:

Originally posted by pop11
So it is a fake? Or just remark of a normal TDA1541A?

Making a fake (working) IC is luckily more complicated than making a fake transistor, IMHO there are 2 possibilities

1- Someone has around a overstock of plain 1541s (the writings are way too similar to Elib's photo of 1541) or inferior specification chips and, seen the great interest on this product, rebrands them as "1541A" with later production code

2- The fab that made the double crowns opened again

but without the Philips logo (joke)

To see how good it is (and if it works at all) the only way is to try and compare it with a reguar 1541A. I'm sure that someone has a horny socket

ready to be plugged with such a chip.
If you get to make a comparison, please let us know.

Cheers

Andrea

tschrama · 20th April 2004, 09:30 AM

Hi,

I thought there was another compagny that made TDA1541A chips, as philips alternative, maybe that's what you have?

cya,
Thijs

guido · 20th April 2004, 09:43 AM

Looking at elib's picture you can see that the taiwan is marked
RSH. Seems the factory code is HSH for holland and RSH for taiwan.

Your chip is HSH-97, but in 1997 they were not produced anymore in holland as far as i know.

So yes, it must be fake.

Try to plug in in a (I2S) player.

If it works without pin4 connected, it's an A version.
If pin4 needs to be connected to get sound, it's non A (output buffer latch).

Also the A version needs the cap on pin 16/17, the non A version
does not need one. The A version should sound crap without cap (dem oscillator not running).

Second source for 1541 would have been Wolfson as far as i can remember. Think they made something similar.

mvg,

Bricolo · 20th April 2004, 09:55 AM

You'll also notice that the print font isn't the same as the true philips one

hacknet · 20th April 2004, 09:56 AM

yes i`ve seen tda1541s that look like that they are of the older batches. more than 10 years old i guess.

20th April 2004, 08:47 AM	#3
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	That sure is a remarked one. __________________ It's only audio

20th April 2004, 09:43 AM	#8
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	Looking at elib's picture you can see that the taiwan is marked RSH. Seems the factory code is HSH for holland and RSH for taiwan. Your chip is HSH-97, but in 1997 they were not produced anymore in holland as far as i know. So yes, it must be fake. Try to plug in in a (I2S) player. If it works without pin4 connected, it's an A version. If pin4 needs to be connected to get sound, it's non A (output buffer latch). Also the A version needs the cap on pin 16/17, the non A version does not need one. The A version should sound crap without cap (dem oscillator not running). Second source for 1541 would have been Wolfson as far as i can remember. Think they made something similar. mvg, __________________ GuidoB

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20th April 2004, 08:53 AM	#4
pop11 diyAudio Member Join Date: Mar 2003 Location: Canada	So it is a fake? Or just remark of a normal TDA1541A?

20th April 2004, 08:58 AM	#5
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	What do you mean by "remarqued" ? -a fake chip with 1541 written on it -a genuine 1541, but with new writing on it (why?) And it it's solution 2, the marking date becomes the production date? That's odd!

20th April 2004, 09:30 AM	#7
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	Hi, I thought there was another compagny that made TDA1541A chips, as philips alternative, maybe that's what you have? cya, Thijs

20th April 2004, 09:55 AM	#9
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	You'll also notice that the print font isn't the same as the true philips one

20th April 2004, 09:56 AM	#10
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	yes i`ve seen tda1541s that look like that they are of the older batches. more than 10 years old i guess.

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