Bidirectional TVS in DO-214AB – 1500 W peak pulse, 43 V rail
The SMCJ43CAE3/TR13 is a bidirectional Zener TVS diode from Microchip, rated for 1500 W peak pulse power per the 10/1000 µs waveform. It clamps a 43 V nominal rail at 69.4 V maximum when the surge current hits 21.6 A. The minimum breakdown voltage of 47.8 V gives a guard band above the 43 V standoff, so the diode stays off during normal operation and only conducts during an overvoltage event.
Clamping voltage and breakdown margin for 24 V and 43 V rails
For a 24 V DC bus, the 43 V reverse standoff leaves headroom — the TVS will not clip normal 24 V transients. The 69.4 V clamping ceiling is well above a 24 V rail's typical surge, so the protected circuit sees a clamped spike, not the full transient. On a 43 V rail, the 47.8 V minimum breakdown ensures the diode triggers before the rail exceeds its absolute maximum rating.
Active production – sourcing via RFQ
Microchip lists the SMCJ43CAE3/TR13 as Active.
DO-214AB footprint and temperature range
The DO-214AB (SMC) package has a standard JEDEC footprint with a cathode tab that doubles as the thermal pad — the board copper area under the tab sets the junction-to-ambient thermal resistance.