Clamping voltage and standoff selection
The 1.5SMC56H: The reverse standoff voltage of 45.4 V (typ) is the dc working voltage the protected rail sits at without the TVS conducting — it sees the full rail continuously. For a telecom 48 V rail, the 45.4 V standoff gives comfortable headroom below the minimum breakdown — the part is off at normal operating voltage and turns on only for the transient.
Automotive grade and temperature range
AEC-Q101 qualification means the part passed the automotive discrete semiconductor stress battery — temperature cycling, humidity, and surge current. The junction operating range of -55°C to 150°C covers the full automotive thermal band. For engine-compartment or body-control modules that see prolonged 125°C ambient, the 150°C Tj ceiling still leaves derating margin at the package level.
Package and assembly notes
The DO-214AB SMC is the larger SMC variant — it is not the same foot print as a DO-214AA or DO-214AC SMA. Verify the pad layout on the board landing pattern before committing a BOM quantity. Shipped on tape and reel per; confirm reel orientation matches the pick-and-place feeder configuration.
Sourcing posture and lifecycle
Listed Active by Taiwan Semiconductor Corporation.