Does anyone knows this serial number of an IC WR630161 9550, which is a 16 pin when i went to buy UM 3481 shopkeeper gave me this . but when i tried this in um 3481 doorbell circuit its not functioning, kindly help.
You could be looking at the first line of the IC numbering, while the actual part number could be on the second line. If u can share a picture of the IC, we can get to the part number.