What the voltage ratings mean for transient protection
The 5KP170CA/B: The standoff voltage of 170 V sets the maximum operating rail the diode sees during normal circuit operation — the TVS remains off and draws only leakage current until a transient pushes the line above 189 V breakdown. The CA/B suffix on a 5KP package is the bidirectional polarity variant — the single bidirectional channel means both polarities of transient are clamped symmetrically without requiring two unidirectional devices back-to-back.
P600 axial package and board integration
The P600 axial package requires a through-hole pad footprint sized for a lead diameter that mates with the diode body — the cathode lead is typically marked with a band on the body end, and the board layout should allow the leads to be formed or clipped to the panel spacing without stressing the glass-body seal. With a maximum junction temperature of 150 °C and the peak pulse rating at 5000 W, the dominant thermal path is through the leads to the PCB copper — for repetitive surge events the designer must verify that the lead-temperature rise stays below the 150 °C TJ limit by checking the pad and via thermal design, not just the package rating alone.