The 1.5SMC8.2A TR13 PBFREE: The 1500W peak pulse power rating (1.5kW) specifies what surge the diode can absorb during a 10/1000µs transient event — this is the standard IEC 61000-4-5 lightning-surge waveform. At 124A peak pulse current, the clamping voltage is held to 12.1V maximum, so a circuit sitting behind a 5V rail sees a 12.1V spike clamped well below any downstream breakdown. The 7.02V reverse standoff voltage is the working voltage at which the TVS stays off and draws only leakage current — it sits cleanly above the nominal rail it protects. The 7.79V minimum breakdown voltage ensures it snaps into conduction predictably, not prematurely at normal operating voltage.
Clamping performance and the unidirectional Zener topology
This is a unidirectional Zener-type TVS — it clamps positive transients relative to ground but does not suppress negative swings. For bidirectional protection (AC rails, differential signal lines), you would need a bidirectional TVS in the same package family. The single channel here serves one polarity only. With a maximum junction temperature of 150°C and an operating range down to -65°C, the part covers the full industrial envelope — including outdoor enclosures and unheated equipment bays where temperature extremes are the norm, not the edge case.
DO-214AB SMC footprint and thermal considerations
The DO-214AB (SMC) package exposes a large cathode pad on the bottom — thermal relief to the PCB plane matters more than the package itself for surge handling. The diode dissipates the clamping energy as heat during the transient; a well-poured copper pad under the cathode tab extends the effective survivable surge count in repetitive-event applications.
The 1.5SMC8.2A is listed Active by Central Semiconductor Corp.