Electronics > Repair
Identifying RF chip
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IanMacdonald:
Anyone able to identify this chip? It's an RF output amp from a car key fob. Fortunately it seems like the encoder chip is OK since that would be manufacturer-specific. This is the RF out chip, and it's leaking such that the battery is discharged in a few days.

Looks like 7507 6228 5RYC

6 is a bit indistinct, others clear.

Assuming the dot is 1:
2: signal in
4: Gnd
7: 12k to gnd
10,11: loop antenna
12: V+ (3v)

CJay:
Doubtful it's an RF amp, it's likely to be a microcontroller with RF circuitry built in.

Common fault on keyfobs is leaky switches and a build up of conductive 'crud' in the fob.

I assume you've cleaned it thoroughly, even desoldered the switches?

IanMacdonald:
The other chip to the left is the controller, which seems to be working OK. Buttons desoldered and entire board well washed. Gently warming the RF chip greatly increases the leakage current.
nighthunter:
Hi, try to look at Silabs datasheets maybe some Silabs one. On what frequency and modulation does it transmitt?
mauda:
Hello, I have also problems with this kind of key fobs. Did you find the datasheet or the solution? Thank you for your reply.
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