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Technical Topics => The RF Workbench => Topic started by: ff on September 03, 2013, 0138 UTC

Title: TDA2003 has been obsoleted
Post by: ff on September 03, 2013, 0138 UTC
Another VERY useful part (for 12V audio amps and modulators) bites the dust and I am sorry to see these go.  I just received this notification from Digi-Key:

Dear Valued Digi-Key Customer,
You have purchased the following part number from Digi-Key within the last two years. The manufacturer has announced an update to the part status.

Manufacturer STMICROELECTRONICS
Description IC 10W CAR AUDIO AMP PENTAWATT
Manufacturer Part Number TDA2003AV
Digi-Key Part Number 497-11263-5-ND
Status Obsolete 
Last Time Buy Date Undefined By Supplier
Substitutes Please click here

I'm sure we'll be able to buy these for a couple more years but they will be drying up more and more, starting now.  So if you've been waiting...
Title: Re: TDA2003 has been obsoleted
Post by: RadioAnarchy on September 03, 2013, 0250 UTC
yes, a very cool part indeed.  and the TDA2002 before it.

I just checked NTE Inc and they list the inventories of
the NTE1288 (same as TDA2003), and a few hundred available.

http://dilp.netcomponents.com/cgi-bin/nteinc.asp?partnumber1=NTE1288 (http://dilp.netcomponents.com/cgi-bin/nteinc.asp?partnumber1=NTE1288)

.


Title: Re: TDA2003 has been obsoleted
Post by: redhat on September 03, 2013, 2331 UTC
Try the LM1875.  Still in full production from TI (Who acquired National recently).  Its also a 20W part, vs. 10W for the TDA2003, and shares the same pinout.

+-RH
Title: Re: TDA2003 has been obsoleted
Post by: ff on September 03, 2013, 2355 UTC
Quote from: redhat on September 03, 2013, 2331 UTC
Try the LM1875.  Still in full production from TI (Who acquired National recently).  Its also a 20W part, vs. 10W for the TDA2003, and shares the same pinout.

+-RH

Hi Redhat - I'm not sure how well the 1875 behaves on a 12 volt supply.  Maybe I'll play with one and see, if can I find some time for it.  I was using 1875s a while back when I was playing around with a 24 volt Heising modulation scheme.  It was definitely a good performer at the higher voltage level.
Title: Re: TDA2003 has been obsoleted
Post by: redhat on September 04, 2013, 0212 UTC
16V is listed as the minimum supply voltage.  I realize that simplicity is key, but you could go for a discrete design, or better yet, go series modulation with PWM.  DC-20KHz audio bandwidth, good efficiency too which means cooler operation.  The only bitch is getting the 26V to modulate it with, but with transformer coupling, the modulator could also be the step up converter.

Just 2¢

+-RH
Title: Re: TDA2003 has been obsoleted
Post by: ff on September 04, 2013, 0256 UTC
Very compelling modulation idea Redhat!  I'm not sure I have the technical expertise to pull it off though.  I haven't had much luck in my previous flailings at PWM audio.  But I guess that sooner or later I'll probably feel masochistic again :D