What the 600W pulse rating means for your protection budget
The SMBJ150CE3/TR13 is a bidirectional Zener TVS rated for 600W peak pulse power under the 10/1000µs waveform. If your load's absolute maximum rating is below 268V, this part will not protect it; you need a lower standoff or a higher-power device.
Package and mounting — DO-214AA SMB footprint
The bidirectional construction means there is no polarity to worry about on the PCB — the two pins are symmetrical, which simplifies layout and eliminates orientation errors during assembly. The tape-and-reel delivery is the standard format for pick-and-place; no special handling required beyond standard SMD reflow profiles.
The wide range means no derating is needed for outdoor telecom cabinets, engine-bay electronics, or avionics that see thermal cycling. The Zener breakdown voltage (minimum 167V,) shifts with temperature — the datasheet's temperature coefficient curve should be checked if the clamping threshold is critical across the full temperature swing.
Lifecycle and supply posture — active production
Microchip lists the SMBJ150CE3/TR13 as Active. No direct second-source is listed, but the SMBJ series is a widely used TVS family — any 600W bidirectional TVS in SMB (DO-214AA) with a 150V standoff is a functional cross-shop candidate, though pin-compatibility should be verified against the specific footprint and pad layout.