Active TVS for 120V Rails – SMCJ120E3/TR13
The SMCJ120E3/TR13 is an active-production Zener TVS diode from Microchip Technology, rated for 120V reverse standoff and 1500W peak pulse power in a DO-214AB (SMC) surface-mount package. The 214V clamping voltage at 7A peak pulse current (10/1000µs waveform) gives you a solid clamp margin on a 120V DC rail — typical for industrial power supplies, telecom line cards, or general-purpose board-level surge protection.
Clamping and Temperature Range
Breakdown voltage min is 133V, so the part starts conducting just above the 120V standoff — that narrow window means the rail stays protected without nuisance triggering on normal ripple. Unidirectional, single-channel design — one device per rail.