What this TVS does on the rail
Its single bidirectional channel means it can protect AC lines or dual-polarity DC rails without polarity concerns. The 1500W peak pulse power rating (1.5kW) at the 10/1000µs waveform gives it the energy capacity to handle lightning-induced surges, inductive load dumps, and switching transients in industrial and telecom equipment.
Clamping voltage and surge current — the protection envelope
For a 188V rail, the 209V minimum breakdown voltage ensures the device stays off during normal operation and only conducts when the transient exceeds that threshold. The 26A peak current capability (8/20µs) is the figure to use when sizing the TVS against the expected surge current from the source impedance and transient energy.
Package and thermal reality for the layout
Housed in a DO-214AB (SMC) surface-mount package, this part shares the standard footprint used across the 1500W SMCJ family. The SMC package's large tab area must be soldered to an adequate copper pour on the PCB to dissipate the heat from repeated surge events — the 1500W rating assumes a low-thermal-resistance board connection.