Low Cost Reverse Polarity And Over Current Protection (corrected) ●

Virtually zero heat generation compared to diodes.

Can be implemented in tiny SOT-23 or SOIC-8 packages for compact PCBs. ⚠️ Pro-Tips for Implementation Check Vgs: Ensure your MOSFET’s Gate-to-Source voltage ( VGScap V sub cap G cap S end-sub Virtually zero heat generation compared to diodes

If current exceeds the limit, the PTC heats up rapidly, its resistance spikes, and it effectively "opens" the circuit until the fault is removed and it cools down. 📐 Circuit Design Value/Part No. Q1 P-Channel MOSFET Reverse Polarity Switch F1 PTC Resettable Fuse Over-current Protection D1 10V - 15V Zener Gate Over-voltage Protection R1 10kΩ - 100kΩ Gate Pull-down 💡 Key Advantages the PTC heats up rapidly