It is a field-effect transistor (FET) that uses holes as carriers and is turned on by applying a negative voltage to the gate. Its core advantage lies in simplifying the switching drive of the high-side (power supply end), making it commonly used in power management, battery protection, automotive electronics, and CMOS circuits.

Features:
Suitable for high-end side switches (high-side switches), with simple driving and no bootstrap circuit required
Under the same voltage/current conditions, the on-resistance RDS(on) is larger than that of N-channel
The switching speed is generally slightly slower than that of N-channel
The price is usually higher

Typical Applications:
1. High-side power switch (high-end switch)
    Positive pole on-off control for battery-powered equipment, industrial control modules, and automotive loads
2. Reverse polarity protection circuit
    Prevent damage to the circuit caused by reverse power connection
3. Logic level switch / Analog switch
    Low voltage signal switching, analog switch array
4. Complementary push-pull circuit (CMOS structure)
    Paired with N-channel for half-bridge and power amplifier output stage
5. Low-voltage linear regulation / load current limiting
    Low-power LDO, simple current limiting protection