1500 W axial TVS for 48 V rail clamping
The 1.5KE56A R0G: With a 47.8 V reverse standoff voltage and a minimum breakdown of 53.2 V, it clamps transients at 77 V maximum while conducting 20 A peak pulse current. The DO-201AA axial-lead package (DO-27 footprint) is a through-hole form factor that survives rework with a standard soldering iron — no hot-air station needed for a field swap.
Clamping voltage and pulse current — what they mean on a 48 V bus
The 77 V clamping voltage at 20 A means a 48 V nominal bus (battery or telecom) sees transients held to under 80 V — well within the typical 100 V rating of downstream DC-DC converters and POL regulators. The 1500 W peak pulse rating at 10/1000 µs is the standard telecom surge waveform; for shorter pulses (8/20 µs) the device handles significantly higher peak current, but the 20 A figure at the longer waveform is the conservative design-in number.
Active production — sourcing posture
No official second-source or pin-compatible cross-reference is listed — the DO-201 footprint is standard across the 1.5KE family, but the breakdown voltage bin (53.2 V min) is specific to the 56A variant.