1.5kW bidirectional Zener TVS in DO-214AB SMC
The SMCJ51CAE3/TR13 is a bidirectional Zener TVS diode from Microchip Technology, rated for 1500W peak pulse power (10/1000µs waveform). It protects a 51V nominal rail, with a breakdown voltage minimum of 56.7V and a clamping ceiling of 82.4V at the rated peak pulse current of 18.2A.
Voltage ratings and clamping margin
The 56.7V minimum breakdown gives a 5.7V guard band before the diode starts to avalanche. The 82.4V clamping voltage is the peak voltage the downstream circuitry sees during a surge — design the 51V rail's downstream components to survive at least this level. At 18.2A peak pulse current, the diode shunts the surge energy while keeping the voltage clamped. The 1500W rating is the product of clamp voltage and peak current — a standard benchmark for comparing TVS diodes in the same package class.
This removes the lifecycle risk for new designs and long-running BOMs. The base product number SMCJ51 is shared across the family; the 'CA' suffix denotes bidirectional, and '' indicates RoHS compliance.
General-purpose application classification means it suits a wide range of overvoltage protection scenarios: I/O lines, DC power buses, telecom interfaces, and sensor inputs.