1500W peak pulse power for 6V rails
The SMCJ6.0CAE3/TR13 is a bidirectional Zener TVS diode rated for 1500W peak pulse power at 10/1000µs waveform. That 1500W rating means it can clamp a 145.6A transient to 10.3V maximum, which is the voltage the protected circuit actually sees. For a 6V nominal rail, the 10.3V clamp gives enough headroom above the 6.67V breakdown minimum to avoid nuisance triggering on normal ripple.
Bidirectional clamping for AC or differential lines
Active production, DO-214AB package
The 150°C upper limit means the TVS can sit near hot components without derating its pulse power — but the actual derating curve in the datasheet should be checked for repetitive pulse conditions.