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Microchip Technology SMAJ20E3/TR13 — Circuit Protection

SMAJ20E3/TR13 Zener TVS Diode – Microchip, 500W, DO-214AC

MPNSMAJ20E3/TR13
Active

Microchip Technology SMAJ20E3/TR13, Zener TVS, 500W peak pulse power, 22.2V min breakdown, unidirectional, DO-214AC (SMA) surface-mount package, Tape & Reel.

$0.1800Ref. price · indicative, final on quote
Microchip Technology SMAJ20E3/TR13 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMAJ20E3/TR13 specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown22.2V
Voltage - clamping (Max) @ ipp35.8V
Voltage - reverse standoff20V
Current - peak pulse (10/1000μs)13.9A
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

Zener TVS – 500W peak pulse, 22.2V breakdown

The SMAJ20E3/TR13 is a unidirectional Zener transient-voltage-suppression (TVS) diode from Microchip Technology, rated for 500W peak pulse power per the 10/1000µs waveform. Its minimum breakdown voltage is 22.2V, clamping a 20V nominal rail at 35.8V max under a 13.9A peak pulse current.

The 22.2V minimum breakdown ensures the device does not conduct during normal 20V operation, leaving a 2.2V margin before avalanche. At the clamp point, 35.8V max is the voltage the protected circuit must survive for the pulse duration — a typical 20V-rated capacitor or IC with 40V absolute max has headroom. The 13.9A peak pulse current is the surge the diode shunts; verify your source impedance and expected transient energy stay within the 500W pulse derating curve.

Microchip lists the SMAJ20E3/TR13 as Active.

DO-214AC (SMA) – surface-mount footprint for automated assembly

The DO-214AC (SMA) package uses a standard JEDEC footprint with a cathode tab on the top side.

Frequently asked questions

Does SMAJ20E3/TR13 come in tape and reel packaging?

Yes, the /TR13 suffix denotes Tape & Reel (TR) packaging, suitable for automated surface-mount assembly.

What is the peak pulse power rating of SMAJ20E3?

This is the maximum surge energy the device can dissipate without damage, assuming proper derating for temperature.

Is SMAJ20E3 unidirectional or bidirectional?

Unidirectional — it has one channel for positive-going transients. For bidirectional protection on AC or bipolar rails, a different part number in the SMAJ family would be needed.