The STMicroelectronics SMAJ24A-TR is a unidirectional transient voltage suppression (TVS) diode from the TRANSIL™ series, designed to clamp overvoltage transients on power and signal lines. It is rated for a peak pulse power of 400W (10/1000µs waveform) and offers a reverse standoff voltage of 24V, a minimum breakdown voltage of 26.7V, and a maximum clamping voltage of 50V at the peak pulse current.
The 24V reverse standoff voltage is the maximum DC or AC peak voltage the device can withstand without conducting — your protected rail should stay at or below this level. The minimum breakdown voltage of 26.7V is where the diode starts to avalanche; this 2.7V margin above standoff ensures no leakage under normal operation. The clamping voltage of 50V is the maximum voltage the load sees during a surge event — confirm your downstream components can tolerate a 50V transient. For a 24V nominal rail (e.g., 24V industrial sensors or automotive battery lines), this part provides a clean protection window.
Package and mounting note
The DO-214AC (SMA) package is a low-profile, surface-mount outline common for TVS diodes.
It is RoHS compliant, which is standard for ST's TRANSIL™ series.