1500W bidirectional TVS — Littelfuse 1.5KE15CA
The single bidirectional channel protects against both positive and negative surges on the same line, which simplifies board layout for symmetrical signal rails.
Clamping voltage and pulse current — what the ratings mean for the BOM
For a 12V rail, this clamp margin is about 9V above the nominal — typical for a 1.5kW-class TVS protecting a 12V bus. The 71.7A Ipp figure is the peak current the device can shunt without exceeding its thermal limit on that waveform; real-world surge duration shorter than 1000µs allows higher peak current within the same power envelope. The through-hole DO-201AA axial package handles the thermal cycling of soldered leads better than surface-mount equivalents in high-vibration settings. Power line protection is marked as 'No' — this TVS is designed for signal and low-power DC rail protection, not for AC mains or high-energy direct lightning strike suppression. For mains protection, a higher-energy MOV or gas discharge tube would be the correct class.