What this TVS clamps and where it fits
The SMCJ33CAE3/TR13 is a bidirectional Zener TVS diode rated for 1.5 kW peak pulse power (10/1000 µs waveform) with a 33 V reverse standoff voltage and a minimum breakdown of 36.7 V. Clamping is specified at 53.3 V max at 28.1 A peak pulse current. The -65°C to 150°C junction temperature range covers outdoor telecom, industrial I/O, and automotive-adjacent 24 V rails without derating at the high end. The '' suffix indicates Microchip's high-reliability screening flow — not AEC-Q101 formally, but built for extended temperature and mission-critical use.
The base product number is SMCJ33. The CAE3 variant is the bidirectional, high-reliability grade. For a standard bidirectional version without the screening, the SMCJ33CA is the closest sibling — same DO-214AB package, same electrical ratings, different test flow.
Package and mounting note
DO-214AB (SMCJ) supplier device package — the cathode band is marked on the body. Reflow profile per JEDEC J-STD-020; The 0.50 mm lead pitch demands a solder paste stencil aperture sized to the pad footprint in the datasheet.