I am unable to verify the part markings for MAX4466EXK the parts are marked with "ACH", but I can locate one document that has the marking "ACH" but it is for MAX6326. There is no mention of markings on the datasheet?
MAX6326
Production
The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 microprocessor (µP) supervisory circuits monitor the power supplies in µP and digital systems. These...
Datasheet
MAX6326 on Analog.com
MAX4466
Production
The MAX4465–MAX4469 are micropower op amps optimized for use as microphone preamplifiers. They provide the ideal combination of an optimized gain bandwidth...
Datasheet
MAX4466 on Analog.com
I am unable to verify the part markings for MAX4466EXK the parts are marked with "ACH", but I can locate one document that has the marking "ACH" but it is for MAX6326. There is no mention of markings on the datasheet?
Unfortunately, we are unable to provide information about parts in the EngineerZone community based on their markings. We suggest going back to your point of purchase to get this information. ADI only provides warranty coverage or any quality, reliability, failure analysis, applications, or other support on products purchased through ADI authorized distributors and sales offices. To ensure you are receiving unused, legitimate ADI products, please ensure all purchases are made through the ADI authorized distributors and sales offices listed on our website at Sales and Distribution | Analog Devices.
You can get more information on this topic on our website at Quality and Reliability Programs | Analog Devices.