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Microchip Technology SMAJ120CAE3/TR13 — Circuit Protection

SMAJ120CAE3/TR13 TVS Diode – 500W, 120V Bidirectional

MPNSMAJ120CAE3/TR13
Active

Microchip Technology SMAJ120CAE3/TR13, Zener TVS diode, 500W peak pulse power, 120V reverse standoff, bidirectional, DO-214AC (SMA) package, Tape & Reel.

$0.1600Ref. price · indicative, final on quote
Microchip Technology SMAJ120CAE3/TR13 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMAJ120CAE3/TR13 specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown133V
Voltage - clamping (Max) @ ipp193V
Voltage - reverse standoff120V
Current - peak pulse (10/1000μs)2.6A
Power - peak pulse500W
Power line protectionNo
Operating temperature-65°C~150°C(TJ)
PackageTape & Reel (TR)
ApplicationsGeneral Purpose
CaseDO-214AC, SMA
Bidirectional channels1

Product details

The SMAJ120CAE3/TR13 clamps at 193V max during a surge, limiting the voltage seen by the downstream IC or module. For a 120V nominal rail (reverse standoff), this gives headroom above the operating voltage before the TVS starts conducting. Peak pulse power is rated 500W for the same 10/1000µs waveform. That 500W rating is the product of clamp voltage and peak current — at 193V clamp, the device handles 2.6A peak. For shorter pulses (8/20µs) the power capability is higher, but the datasheet's 10/1000µs rating is the conservative benchmark for most AC-line or DC-bus protection designs.

Microchip lists the SMAJ120CAE3/TR13 as Active. That covers cold-start conditions in outdoor telecom cabinets and the self-heating from repetitive surges in industrial control panels.

DO-214AC (SMA) — reel-ready for pick-and-place

Supplied on Tape & Reel, the SMAJ120CAE3/TR13 is ready for automated assembly. The DO-214AC (SMA) body is a two-pin surface-mount package with a cathode band on the unidirectional variant, but the bidirectional version has no polarity mark.

Frequently asked questions

Is SMAJ120CAE3/TR13 bidirectional?

Yes — it is a single-channel bidirectional Zener TVS diode. It clamps symmetrically in both directions, with a breakdown voltage of 133V min and reverse standoff of 120V. No cathode orientation required on the PCB.

What is the peak pulse power of SMAJ120CAE3/TR13?

Rated 500W peak pulse power for a 10/1000µs waveform. At the 193V max clamp voltage, the corresponding peak pulse current is 2.6A. For shorter pulses the power capability increases, but the 10/1000µs rating is the standard comparison point.

What is the difference between SMAJ120CAE3/TR13 and SMAJ120A?

SMAJ120A is the unidirectional version of the same 120V reverse standoff, 500W TVS. The SMAJ120CAE3/TR13 is bidirectional. Both share the same DO-214AC (SMA) package and 193V clamp voltage. If your circuit sees transients of both polarities on the same line, the bidirectional part saves a diode or a second device.