1500 W peak pulse — what it means on the rail
The 1.5SMC47CA TR13 PBFREE: That power rating tells you the junction absorbs a 23.2 A surge (the peak pulse current at that waveform) without failing — the clamp voltage holds at 64.8 V max during the event. The reverse standoff voltage is 40.2 V, meaning the part stays transparent on a 40 V rail and only starts conducting when the transient pushes past the minimum breakdown of 44.7 V. For a 36 V or 40 V DC bus, this is the right protection threshold — it does not clip normal ripple but catches surges before they reach the downstream silicon.
DO-214AB (SMC) is a standard surface-mount package for 1500 W TVS diodes. The footprint is shared across multiple manufacturers, so the PCB land pattern is well established. The SMC body has a visible cathode band on unidirectional parts; this bidirectional variant has no polarity mark — either orientation works, which simplifies pick-and-place and reduces the risk of a reversed part on the board. That covers the full automotive under-hood range and industrial enclosures near motors or furnaces. The wide margin also means the derating at high ambient is less aggressive — the 1500 W rating holds to 25°C and derates linearly above that per the datasheet curve.
Active lifecycle — no end-of-line pressure
The Tape & Reel packaging (TR13 suffix) matches standard 13-inch reel quantities for automated assembly. The Pb-free finish (PBFREE) is RoHS-compliant and compatible with lead-free reflow profiles.