2
\$\begingroup\$

The photo below shows a part that I am trying to find a specification for. I suspect that it is a microcontroller, and is part of a larger device that is essentially a timer. It clearly bears the National Semiconductor logo.

enter image description here

However, I cannot find this device via searching, and it doesn't seem to fit into the National Semiconductor device naming conventions. Is it plausible that this might be a part custom-made by N.S. for the larger device manufacturer? Is this kind of thing done?

\$\endgroup\$
7
  • \$\begingroup\$ I think is a Freesacale MCU \$\endgroup\$ May 18, 2016 at 10:36
  • \$\begingroup\$ What does the device that the part is in do? Is it a power supply? Thermostat? \$\endgroup\$
    – CHendrix
    May 18, 2016 at 10:36
  • 1
    \$\begingroup\$ Yes, this kind of thing is done! I don't have enough experience to speculate on the rest, but if you have enough money, you can get custom part numbers. \$\endgroup\$
    – AndrejaKo
    May 18, 2016 at 10:36
  • \$\begingroup\$ @CHendrix - a timer \$\endgroup\$
    – Gremlin
    May 18, 2016 at 10:38
  • 1
    \$\begingroup\$ @MarkoBuršič: NatSemi manufacturing Freescale parts? \$\endgroup\$ May 18, 2016 at 10:38

3 Answers 3

1
\$\begingroup\$

It is... I wouldn't say "common" per se, but not unheard of for semiconductor manufacturers to create or manufacture custom (ASIC) or custom-screened (although standard under the hood) parts for very large customers with no publicly trackable part number. At a cost, of course.

\$\endgroup\$
4
\$\begingroup\$

I suspect it's a 'house numbered' microcontroller, probably an OTP or mask-programmed COP8 series.

See if this matches the use of the pins:

enter image description here

It's not unusual for such chips to be house numbered if they're supplied in relatively large quantity.

\$\endgroup\$
2
\$\begingroup\$

Custom or semi-custom parts with the customer's "house number" are quite common. Especially with integrated circuits. It is not unusual to open a mass-produced item and find chips that have only OEM part numbers.

There have been a few cases where the community has "reverse-engineered" a mystery part in a particularly venerated product (legendary synthesizers, popular game consoles, etc.) but that is extraordinarily rare.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.