Need help identifying an IC

Semiconductor Integrated Circuits (ICs)
1

I have an 18 pin chip with no markings on the top. I pulled it from the PCB and the following letters / numbers are on the bottom:

JZJK A1903HA8

This is part of a fan control circuit. This chip is attached to a series of switches, then in turn, is connected to the inputs of a ULN2003A. The ULN2003A outputs are tied to a series of relays which are connected to various windings of the fan motor.

Ideas?

2

Hello curtissg,

Sounds like some type of motor control IC chip, but I have no idea what may replace it.

Maybe one of the engineers can add to this post, with some recommendations.

3

Thanks for checking it out!

4

Seems likely as not to be a microcontroller of some flavor, in which case simply replacing the device wouldn’t do much good without the accompanying firmware to program onto it.