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STMicroelectronics SMAJ188A-TR — Circuit Protection

STMicroelectronics SMAJ188A-TR TRANSIL TVS Diode

MPNSMAJ188A-TR
Active

STMicroelectronics SMAJ, TRANSIL™ series, TVS Zener, 188V reverse standoff, 209V breakdown min, 388V clamping, 400W peak pulse, 1 unidirectional channel, DO-214AC SMA, surface mount, -55°C~150°C.

$0.5400Ref. price · indicative, final on quote
STMicroelectronics SMAJ188A-TR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMAJ188A-TR specifications
ParameterValue
TypeZener
SeriesSMAJ, TRANSIL™
MountingSurface Mount
Voltage - breakdown209V
Voltage - clamping (Max) @ ipp388V
Voltage - reverse standoff188V
Current - peak pulse (10/1000μs)6A (8/20µs)
Power - peak pulse400W
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AC, SMA
Unidirectional channels1

Product details

TRANSIL TVS — what this 188 V standoff part does

It provides a single channel of protection in a surface-mount package, rated for 400 W peak pulse power.

Voltage thresholds and clamping behaviour

The reverse standoff voltage (working voltage) is 188 V — the rail or signal line should never exceed this in normal operation. Breakdown occurs at a minimum of 209 V, and the clamping voltage is held to 388 V maximum at the rated peak pulse current of 6 A (8/20 µs waveform).

Housed in a surface-mount package, the SMAJ188A-TR is suited for automated assembly.

Frequently asked questions

Is SMAJ188A-TR obsolete?

No.

What are the specifications of SMAJ188A-TR?

It is a 188 V reverse-standoff, 209 V min breakdown, 388 V clamping, 400 W peak pulse power TVS diode in a DO-214AC SMA package, operating from -55°C to 150°C.

What is the closest pin-compatible alternative to SMAJ188A-TR in this component family?

The SMAJ series includes multiple voltage variants in the same DO-214AC footprint. For the same 188 V standoff, the SMAJ188A (without the -TR suffix) is functionally identical — the -TR suffix indicates tape-and-reel packaging. Any other SMAJ voltage variant will be pin-compatible but offers a different protection threshold.