There has been one thing about the TEA2025B Operational Amplifier that I cannot seem to find information on. The ones manufactured by ST usually are marked by the Model#, then the date code or batch code(?), followed by the country of manufacture.
The part I don't understand exactly is the date code format.
I have several from different sources in front of me right now, all Manufactured in Malaysia but with the following codes:
At first I thought the first set were to indicate from 1990-1993 but the 93's were on the soundblasters.. and the others on newer PCI soundcards. I'm assuming now that I compare the date stamps altogether the last 4 digits indicate the year/week I just realized. The parts I don't know of though are the first 5 digits and mostly interested in digit 4 and 5 respectively.
The last two I only have partial codes from as they were shorted IC's with a massive hole literally blown clean out from the top of it. Pictures on request for laughs
The part I don't understand exactly is the date code format.
I have several from different sources in front of me right now, all Manufactured in Malaysia but with the following codes:
Code:
W990D0001 (PCI Yamaha) W991W9841(PCI Yamaha) W991E9422 (PCI Yamaha) W993U9648 (ISA soundblaster) ????N9440 (ISA soundblaster) ????69819 (PCI Yamaha)
The last two I only have partial codes from as they were shorted IC's with a massive hole literally blown clean out from the top of it. Pictures on request for laughs