Skip to main content
Log in
STMicroelectronics SMAJ188CA-TR — Circuit Protection

STMicroelectronics SMAJ188CA-TR TRANSIL™ Bidirectional TVS

MPNSMAJ188CA-TR
Active

STMicroelectronics SMAJ, TRANSIL™, Type Zener, SMAJ188CA-TR, 400W Peak Pulse Power, 188V Reverse Standoff, 209V Min Breakdown, 388V Clamp, Bidirectional, DO-214AC (SMA), Surface Mount, -55°C~150°C.

$0.4300Ref. price · indicative, final on quote
STMicroelectronics SMAJ188CA-TR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMAJ188CA-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
Bidirectional channels1

Product details

Bidirectional TVS for 188V rail protection

It is a Zener-type device rated for 400W peak pulse power (10/1000µs waveform), with a minimum breakdown voltage of 209V and a maximum clamping voltage of 388V at the peak pulse current of 6A (8/20µs).

Voltage window—where it protects

Above that, the 209V minimum breakdown voltage defines where the TVS starts to avalanche. The 388V clamping voltage is the maximum voltage seen by the protected circuit during a 6A (8/20µs) surge. For a 188V rail, this window leaves roughly 21V between the rail and the start of clamping—tight enough to protect most downstream semiconductors rated for 200V or higher.

The supplier device package is SMA (DO-214AC). No exposed pad—standard two-pin diode layout.

Frequently asked questions

What is the closest pin-compatible alternative to SMAJ188CA-TR in this component family?

Within the SMAJ series, other bidirectional TVS diodes with different standoff voltages (e.g., SMAJ170CA-TR, SMAJ200CA-TR) are pin-compatible in the same DO-214AC footprint. No direct equivalent with identical voltage ratings is listed as a second source.

Is SMAJ188CA-TR RoHS compliant?

The SMAJ series from STMicroelectronics is typically RoHS compliant, but the specific RoHS status for SMAJ188CA-TR should be confirmed at order time from the current datasheet or certificate of compliance.