Transient protection for 85V rails – 500W bidirectional clamp
The SMAJ85CE3/TR13: It clamps transients to 151V maximum at 3.3A peak pulse current, making it a fit for protecting 85V DC power buses or signal lines from surges and ESD events. The bidirectional design means a single device handles both positive and negative transients, simplifying layout on AC-coupled or bipolar rails.
The 151V clamping voltage at 3.3A (10/1000µs) is the ceiling the protected circuit must survive. If your downstream components are rated below 151V, the SMAJ85CE3/TR13 will not protect them — you need a lower-voltage clamp or a higher-energy device. The 500W peak pulse power is the energy rating for a single 10/1000µs pulse; for repetitive surges or longer pulse widths, derate per the datasheet curve.