1500W bidirectional transient suppressor
The 1.5KE27CA: Its 37.5V clamping voltage at 40.5A peak pulse current (10/1000µs waveform) defines the protection ceiling — any surge that would push the line above 37.5V gets shunted through the device.
Clamping voltage and standoff margin
The 23.1V reverse standoff voltage is the maximum continuous DC voltage the device can withstand without conducting appreciably. The 25.7V minimum breakdown voltage gives a 2.6V guard band before avalanche starts — a 24V rail with 5% tolerance stays safely below the standoff. At the 40.5A peak pulse current, the clamping voltage rises to 37.5V max. This is the voltage the protected circuit must survive during the transient — downstream components need a breakdown rating above this figure.
Through-hole axial package for board-level protection
Housed in a DO-201AA axial package (DO-27 equivalent), the 1.5KE27CA mounts through-hole. The axial leads carry the full 40.5A pulse current — the lead diameter and solder joint must handle the surge without fusing. At 175°C the leakage current rises, but the device still clamps within the rated peak power.