1500W peak pulse power, 185V standoff rail
The 1.5SMC220A TR13 PBFREE: The 185V reverse standoff voltage sets the maximum continuous DC or peak AC voltage the protected line can carry without the diode conducting — above that, the device breaks down at a minimum of 209V and clamps the transient to 328V maximum, shunting 4.6A of peak pulse current away from the load. This is a TVS diode, not a Zener regulator — the 'Zener' type designation refers to the avalanche breakdown mechanism used for transient suppression, not for voltage regulation. The part is intended for unidirectional protection on a single rail, with the cathode band oriented toward the protected supply.
The SMC package offers a larger copper pad area than the smaller SMA/SMB variants, improving thermal dissipation during repetitive surge events.