Twelve-volt systems throw spikes every time a relay clicks or a motor kicks in. Your board shouldn't be the one absorbing that hit. The P4KE 12.1V Zener diode clamps at 15A standoff, rated 400W DC peak, with low Zener impedance so the surge dies before it propagates. 1W steady-state, DO-41 body, rated from −55 °C to 175 °C. One component between your rail and the rest of the circuit
| brand | Jaycar |
| part_number | P4KE |
| zener_voltage | 12.1V |
| standoff_current | 15A |
| peak_power_rating | 400W DC |
| steady_state_power | 1W |
| package | DO-41 |
| operating_temperature | -55°C to 175°C |
| type | Zener Diode |
| category | Electronics & Components |
| subcategory | Electronic Components |
