Please help to find what is the replacment IC for this old National i have attached at photo.

051-9852


This is for the pcb of my stanley garage opener

Any help will be appreciated

 

This is probably a custom labeled product for the OEM manufacturer. If I had to guess it would be a mask programmed microcontroller, and it is unlikely that any substitute would exist. If you understood the rest of the circuit it is possible you could reverse engineer the function and lay out a new PCB. Are you up for the task?

 

It may be a specially programmed device in which case that number is the door opener manufacturers number.
[edit] Papabravo beat me to it.

 

Thanka alot for the answers.

Near this ic is the lm339 ic. It warmed alot and the voltage at vcc pin was 2volt.

Replaced the lm78l82 and voltage is 8.2 V. Also replaced the lm339 IC but the pcb is not functional...
Suppose that this 051-9852 ic is off and if replace it will do the job.

 

I would say the ic at the bottom is a RF decoder chip, and passes the signal to the B9130 chip, the Lm339 is probably to operate the relays and limit switches.

Pictures of the trackside will be helpful in re-engineering.

 

I would say the ic at the bottom is a RF decoder chip, and passes the signal to the B9130 chip, the Lm339 is probably to operate the relays and limit switches.

Pictures of the trackside will be helpful in re-engineering.

 

Just for reference i have purchased a used pcb from the garage technician that installed in first place the door before 25 years an he charged it to me for 120 Euros
I could not wait any more. The door was unlocked.
At ebay someone sells it for 50$

Thanks everyone for posting helpful answers