Skip to main content
Log in
STMicroelectronics SMBJ70A-TR — Circuit Protection

SMBJ70A-TR TVS Diode, 600W, 70V Standoff, DO-214AA

MPNSMBJ70A-TR
Active

STMicroelectronics SMBJ70A-TR, TRANSIL™ series, unidirectional TVS diode, 600W peak pulse power, 70V reverse standoff, 77.8V breakdown, 113V clamping, DO-214AA SMB package, surface mount, -55°C to 150°C.

$0.4100Ref. price · indicative, final on quote
STMicroelectronics SMBJ70A-TR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMBJ70A-TR specifications
ParameterValue
TypeZener
SeriesSMBJ, TRANSIL™
MountingSurface Mount
Voltage - breakdown77.8V
Voltage - clamping (Max) @ ipp113V
Voltage - reverse standoff70V
Current - peak pulse (10/1000μs)5.5A
Power - peak pulse600W
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AA, SMB
Unidirectional channels1

Product details

What this TVS protects and how it clamps

The STMicroelectronics SMBJ70A-TR is a unidirectional transient-voltage-suppression diode from the TRANSIL™ family, built on Zener technology. It clamps voltage spikes on a 70V DC rail — the reverse standoff voltage of 70V means it stays out of conduction during normal operation.

Package and footprint — DO-214AA SMB

Housed in the DO-214AA (SMB) package, this is a surface-mount device with a standard two-pin footprint. The SMB body is smaller than the SMC package used for higher-power TVS diodes, so it fits tighter layouts but still handles the 600W rating.

Frequently asked questions

Is SMBJ70A-TR unidirectional?

Yes, the SMBJ70A-TR is a unidirectional TVS diode, with one unidirectional channel. It protects a single polarity rail and will not clamp negative transients.

What is the closest pin-compatible alternative to SMBJ70A-TR?

Within the same SMBJ family, the SMBJ70A (without the -TR suffix) is functionally identical — same 70V standoff, same 600W rating, same DO-214AA package. The -TR suffix on this part simply denotes Tape & Reel packaging; the bare SMBJ70A may ship in tube or bulk. For a drop-in BOM replacement, any SMBJ70A variant in the same package works.