AEC-Q101 qualification and the 400W surge rating
The SMAJ20AQ-13-F is a unidirectional TVS Zener diode from Diodes Incorporated, part of the Automotive series carrying AEC-Q101 qualification — the automotive discrete semiconductor stress test that covers temperature cycling, ESD, and reliability screening for under-hood and cabin electronics.
Thermal range and package for automated assembly
Operating from -55°C to 150°C junction temperature, the device covers the full automotive temperature envelope — a 125°C ambient under-hood environment still leaves 25°C margin before the junction limit. Housed in the standard DO-214AC (SMA) surface-mount package, it places on a standard footprint with no tombstoning risk at typical reflow profiles — the MSL rating (not stated in this record, but standard for this package class) should be confirmed before the bake step if the part has been in storage beyond the floor-life.