PM509BA-VB is a P-Channel field effect transistor of VBsemi brand. The main parameters are as follows:
- Maximum withstand voltage: -30V
- Maximum drain current: -5.6A
- On-resistance: 47mΩ @ VGS=10V, VGS=20V
- Threshold voltage: -1V

Package is SOT23-3. This device is suitable for SOT23-3 package and is widely used in the following fields and modules:
1. **Power management module:** Due to its load characteristics and low leakage current, it can be used in power switches and voltage regulator modules.
2. **Battery protection:** Suitable for mobile devices and battery management systems to ensure battery safety and performance.
3. **Current control:** Plays a key role in circuits that require P-Channel MOSFET for current control.
4. **Power inverter:** Used to build efficient and compact power inverters.

This device can play a role in low-voltage and low-power applications and is a key component in electronic devices.