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Microchip Technology SMAJ28E3/TR13 — Circuit Protection

SMAJ28E3/TR13 TVS Zener Diode 28V 500W DO-214AC Microchip

MPNSMAJ28E3/TR13
Active

Microchip Technology SMAJ28E3/TR13, Zener TVS diode, 28V reverse standoff, 500W peak pulse power, unidirectional, DO-214AC (SMA) surface mount, Tape & Reel, active

$0.1800Ref. price · indicative, final on quote
Microchip Technology SMAJ28E3/TR13 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMAJ28E3/TR13 specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown31.1V
Voltage - clamping (Max) @ ipp50V
Voltage - reverse standoff28V
Current - peak pulse (10/1000μs)9.9A
Power - peak pulse500W
Power line protectionNo
Operating temperature-65°C~150°C(TJ)
PackageTape & Reel (TR)
ApplicationsGeneral Purpose
CaseDO-214AC, SMA
Unidirectional channels1

Product details

What this TVS diode protects and how it clamps

The SMAJ28E3/TR13 is a unidirectional Zener TVS diode in the DO-214AC (SMA) package, rated for 500W peak pulse power per the 10/1000µs waveform. Its 28V reverse standoff voltage means the protected rail can run at 28V DC nominal without the diode conducting leakage; clamping begins when the voltage exceeds the 31.1V minimum breakdown threshold, and the clamp voltage is held to 50V maximum at the rated 9.9A peak pulse current.

Package and footprint reality for the board

The DO-214AC (SMA) package is a two-pad surface-mount footprint shared across the SMAJ family. The cathode band on the body marks the unidirectional orientation — the anode pad connects to ground, the cathode to the protected rail. Tape & Reel (TR) packaging suits automated pick-and-place for volume assembly.

Sourcing is per RFQ — we confirm availability and current pricing against your BOM quantity at quote time.

Frequently asked questions

What is the peak pulse power of SMAJ28E3/TR13?

500W peak pulse power, measured with a 10/1000µs waveform per the TVS test standard. That rating applies to a single non-repetitive surge; repetitive pulsing requires derating based on the pulse repetition rate and ambient temperature.

Is SMAJ28E3/TR13 unidirectional or bidirectional?

Unidirectional, with one Zener channel. The cathode band on the DO-214AC body marks the polarity — the cathode connects to the protected rail, the anode to ground.

What is the difference between SMAJ28E3/TR13 and SMAJ28A?

Both are 28V TVS diodes in the same SMAJ family and DO-214AC package. The SMAJ28A is a bidirectional device (two Zener channels back-to-back), while the SMAJ28E3/TR13 is unidirectional. The suffix on the Microchip part indicates lead-free / RoHS-compliant finish. For a unidirectional clamp on a 28V rail, the SMAJ28E3/TR13 is the correct choice; for AC or bipolar signal lines, the SMAJ28A would be appropriate.