Skip to main content
Log in
STMicroelectronics SMAJ22CA-TR — Circuit Protection

STMicroelectronics SMAJ22CA-TR TVS Diode, 400W Bidirectional

MPNSMAJ22CA-TR
Obsolete

STMicroelectronics SMAJ, TRANSIL™ series, Type Zener, Bidirectional Channels 1, Voltage - Reverse Standoff (Typ) 22V, Voltage - Clamping (Max) @ Ipp 48.3V, Power - Peak Pulse 400W, Package / Case DO-214AC, SMA, Operating Temperature -55°C~150°C(TJ).

STMicroelectronics SMAJ22CA-TR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

SMAJ22CA-TR specifications
ParameterValue
TypeZener
SeriesSMAJ, TRANSIL™
MountingSurface Mount
Voltage - breakdown24.4V
Voltage - clamping (Max) @ ipp48.3V
Voltage - reverse standoff22V
Current - peak pulse (10/1000μs)48A (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 22V rail protection

It offers a single bidirectional channel in a surface-mount DO-214AC (SMA) package, rated for a peak pulse power of 400W and a clamping voltage of 48.3V at the peak pulse current of 48A (8/20µs waveform).

The 22V reverse standoff voltage (V_RWM) means this device will not conduct appreciably below 22V, so it sits quietly across a 22V supply rail. When a transient exceeds the minimum breakdown voltage of 24.4V, the TVS clamps the surge to a maximum of 48.3V. The 48A peak pulse current rating (8/20µs waveform) gives the energy-handling capacity for typical ESD or lightning-induced surges. For a 22V rail, the clamping margin is about 2.2× the rail voltage — adequate for most ICs rated at 30V or higher, but check the downstream device's absolute maximum rating against 48.3V.

Buyers should evaluate a pin-compatible alternative from the same SMAJ family for new designs or long-term production support.

Frequently asked questions

What is the replacement for SMAJ22CA-TR?

STMicroelectronics has not published an official replacement order code for the SMAJ22CA-TR. A functionally equivalent bidirectional TVS in the same SMAJ family with a 22V standoff and 400W rating can be sourced from the same series — verify the exact breakdown and clamping voltage match your design. For new designs, consider a current-production SMAJ series part with identical ratings.

Can SMAJ22CA-TR be used for 22V protection?

Yes. The 22V reverse standoff voltage (V_RWM) is designed for protecting a 22V nominal rail. The device will not conduct below 22V, and clamps transients to a maximum of 48.3V. Ensure downstream components can withstand the clamping voltage.