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Microchip Technology SMAJ51E3/TR13 — Circuit Protection

SMAJ51E3/TR13 Zener TVS Diode – 51V Standoff, 500W, DO-214AC

MPNSMAJ51E3/TR13
Active

Microchip Technology SMAJ51E3/TR13, Zener TVS diode, 51V reverse standoff (typ), 500W peak pulse power (10/1000µs), unidirectional, DO-214AC (SMA) surface-mount package, Tape & Reel.

$0.1800Ref. price · indicative, final on quote
Microchip Technology SMAJ51E3/TR13 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMAJ51E3/TR13 specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown56.7V
Voltage - clamping (Max) @ ipp91.1V
Voltage - reverse standoff51V
Current - peak pulse (10/1000μs)5.5A
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

51V rail clamp – 500W pulse rating

Its 56.7V minimum breakdown voltage and 91.1V maximum clamping at 5.5A peak pulse current define the protection envelope for a 51V reverse standoff.

Package and rework – DO-214AC (SMA)

Housed in the DO-214AC (SMA) package, this diode uses the standard JEDEC footprint with a cathode tab that doubles as the thermal pad. The SMA body is small enough for dense layouts but large enough to hand-rework with a hot-air station — the tab wets well and the part self-centers on reflow.

Rated for junction temperature from -65°C to 150°C, this diode survives cold storage and hot under-hood conditions. The wide range suits outdoor telecom cabinets, engine bay electronics, and any application where the ambient temperature swings beyond commercial limits.

The suffix indicates RoHS compliance (lead-free termination). Sourced per RFQ; confirm current lead time and pricing at quote time.

Frequently asked questions

Is SMAJ51E3/TR13 RoHS compliant?

Yes — the suffix in the order code denotes lead-free, RoHS-compliant termination. Microchip lists it as active with no RoHS exemption flags.

What is the difference between SMAJ51E3 and SMAJ51?

The suffix indicates lead-free (RoHS-compliant) termination. The SMAJ51 (without) uses standard tin-lead plating. Electrical specs — 51V standoff, 500W peak pulse — are identical.

Can I replace SMAJ51E3 with SMAJ51A?

The SMAJ51A is a bidirectional device; the SMAJ51E3 is unidirectional. They are not direct drop-in replacements unless the circuit is designed for bidirectional clamping. Confirm the polarity requirement before substituting.