How to know the correct original model and production date t

[steve1418]

Sometimes when making some prototype machines, only 2-300 chips are needed, especially some sot23, sot89 models, the supplier will not give us the original packaging, we use a lot of microchip chips, how to query Is the model number correct and the production batch number? I downloaded a marking code manual from the Internet , but it does not include the microchip model. Does microchip have such a similar manual?

[steve1418]

the marking code manual from https://www.onepcba.com/onepcba-marking-code-2

[steve1418]

Does anyone know which model this is for the microchip? marking code AP1U SOT23

[ric]

You already received an answer to this question at https://www.microchip.com/forums/FindPost/1223920