Clamping a 24V rail against surge
The SMCJ24A-13-F: It clamps a 24V nominal rail at 38.9V maximum when hit with a 38.6A peak pulse current — the clamp voltage stays below the typical 40V abs-max of downstream 24V-input DC-DC converters and linear regulators. The 24V reverse standoff voltage (VRWM) means the diode draws negligible leakage below 24V, so it does not load the rail during normal operation. Breakdown starts at 26.7V minimum, giving a 2.7V guard band before the TVS begins conducting.
Package and board-fit constraints
Housed in the DO-214AB (SMC) package, the SMCJ24A-13-F is a surface-mount device with a standard JEDEC footprint. The SMC body handles the 1500W pulse without cracking the epoxy — the copper tab on the cathode side must be soldered to a sufficient PCB copper area to spread the thermal transient. Supplied in Tape & Reel (Cut Tape option available), the part is compatible with automated pick-and-place assembly. The base product number SMCJ24 identifies the 24V standoff family; the A suffix denotes a 5% tolerance on breakdown voltage, and the -13-F suffix indicates the reel packaging format.
Sourcing and lifecycle posture
The part is RoHS-compliant per Diodes standard material declaration.