The 1.5SMC56CAHM3_A/I: That 1500 W figure is the product of the clamp voltage (77 V max at Ipp) times the peak pulse current (19.5 A) — it tells you the device can absorb a 1.5 kW surge without failing, provided the PCB copper area under the DO-214AB pad keeps the junction below 150 °C. The 47.8 V reverse standoff voltage means this TVS starts conducting significantly above the normal 48 V bus level, so a 48 V telecom or automotive supply rail stays below the leakage threshold during normal operation. Clamping at 77 V limits the transient to a level that downstream 80 V-rated MOSFETs or controllers can survive.
Automotive qualification and temperature range
AEC-Q101 qualification means this part has passed the automotive-grade stress tests: high-temperature reverse bias, temperature cycling, and humidity bias. The Automotive grade also flags that the part is on a PPAP-ready baseline, so a Tier-1 supplier can request the production part approval process documentation for their customer submission.
Package and board-fit — DO-214AB (SMC)
The cathode band on the bidirectional version is absent — both pins are identical, so orientation during pick-and-place is non-critical. The SMC body is larger than the SMA/SMB siblings, which helps spread the heat from the 1500 W pulse into the board copper. Supplied in Tape & Reel, compatible with standard 12 mm embossed carrier tape per EIA-481. The reel quantity is typically 850 or 3000 depending on the reel diameter — confirm the count at RFQ for your BOM line.
Sourcing and lifecycle — active production
Cross-reference at RFQ if dual-sourcing is required.