Voltage ratings and clamping behaviour
The SMAJ43A-13: Breakdown occurs at a minimum of 47.8 V, and the clamping voltage at peak pulse current is 69.4 V. This voltage stack defines the protection window: the protected rail stays below 43 V during normal operation, the diode begins conducting above 47.8 V, and the clamp limits transients to 69.4 V — the voltage the downstream circuitry must survive. The 400 W rating is the product of clamp voltage and peak current — the energy capability scales with pulse duration, so shorter spikes (8/20 µs) allow higher peak current before the junction temperature limit is reached.
Package and board integration
Housed in the DO-214AC (SMA) package, with the supplier device package also designated SMA. The operating junction temperature range spans -55°C to 150°C, covering the full industrial and automotive ambient envelope. Power derating above 25°C follows the linear derating curve typical of SMA-packaged TVS diodes — at 150°C the rated peak pulse power drops to zero.
Listed as Active in production by Diodes Incorporated. Sourced through independent distribution channels.