Automotive-grade bidirectional TVS
The 1.5SMC47CA-Q: The 40.2V reverse standoff voltage means this part protects 36V or 42V nominal rails — common in automotive battery lines and telecom rectifier outputs — without conducting during normal operation. The bidirectional configuration simplifies layout: one device clamps both positive and negative transients, saving board space over back-to-back unidirectional diodes.
AEC-Q101 qualification and temperature range
AEC-Q101 qualification certifies this TVS for automotive stress levels: temperature cycling, high-temperature reverse bias, and ESD robustness per the automotive IC reliability standard. The copper pad area under the cathode tab sets the thermal resistance — a solid ground-plane connection is needed to keep junction temperature below 150°C during sustained clamping.