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Diotec Semiconductor 1.5SMCJ120C — Circuit Protection

1.5SMCJ120C TVS Diode, 120V Standoff, 214V Clamp

MPN1.5SMCJ120C
Active

Diotec Semiconductor Zener TVS diode, 1.5SMCJ120C, 120V reverse standoff, 214V clamping max, 7A peak pulse, 1500W peak, surface mount, DO-214AB SMC package.

$0.8068Ref. price · indicative, final on quote
Diotec Semiconductor 1.5SMCJ120C datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

1.5SMCJ120C specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown133V
Voltage - clamping (Max) @ ipp214V
Voltage - reverse standoff120V
Current - peak pulse (10/1000μs)7A
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-50°C ~ 150°C (TJ)
PackageStrip
ApplicationsGeneral Purpose
CaseDO-214AB, SMC
Bidirectional channels1

Product details

The 1.5SMCJ120C is a unidirectional Zener-based TVS diode — it clamps transients in one polarity only, steering surge current away from the protected rail rather than absorbing it symmetrically. For longer-duration or higher-energy transients, the clamping voltage rises above 214V; the datasheet derating curve shows the safe operating region across pulse width and repetition rate.

The clamping performance holds across the temperature span, but the breakdown voltage drifts positive with temperature; the datasheet tempco curve is required for precision over-voltage set-points near 133V.

Frequently asked questions

What package does 1.5SMCJ120C come in?

The part ships in the DO-214AB (SMC) surface-mount package — the industry-standard 2-lead plastic body for 1500W TVS diodes. The strip packaging option is listed; reel or ammotape variants are confirmed against the order code suffix at quote time.

What does 1.5SMCJ120C protect against?

As a unidirectional TVS, it clamps positive-going transients on a single polarity rail — typical targets are 24V and 48V DC power rails, communication bus lines, and sensitive control inputs where the 120V standoff keeps the clamp off during normal operation and fires only on surge events.