1.5 kW peak-pulse clamping — what the TVS ratings mean for the protection circuit
The 1.5SMCJ43AS_R1_00001: The reverse standoff of 43 V defines the continuous working voltage the circuit can hold without conduction; the 47.8 V minimum breakdown marks where the Zener knee begins conducting; and the clamping voltage of 69.4 V at 21.6 A peak pulse sets the upper bound the downstream load sees during a surge event. For a 24 VDC rail, the 43 V standoff gives roughly a 1.7× headroom above the working voltage — enough to stay off during normal operation while clamping a IEC 61000-4-5 surge well below the protected semiconductor's abs-max rating.
DO-214AB SMC — surface-mount protection in a compact power package
The listed application is General Purpose — meaning it is not pinned to a single end-market spec but is broad enough to land in power supplies, motor drive snubbers, telecom rail protection, and instrumentation front-ends. The Power Line Protection field is marked No — this is a board-level clamp, not a field-replaceable mains protector, so the board designer handles the fusing and coordination upstream.
Quoted to order through independent distribution against the BOM quantity; availability and lead time confirmed at RFQ. No franchised-only constraint flagged in the ledger, but traceable sourcing with date-code visibility is the standard ask when specifying a Zener TVS for a safety-adjacent or industrial control board.