Detailed parameter description:
- Product model: UT2301L-AE3-R-VB
- Silk screen: VB2290
- Brand: VBsemi
- Package: SOT23
- Channel type: P-Channel
- Maximum operating voltage: -20V
- Maximum operating current: -4A
- Channel internal resistance: RDS(ON)=57mΩ @ VGS=4.5V, VGS=12V
- Threshold voltage: Vth=-0.81V

Application introduction:
UT2301L-AE3-R-VB is a P-Channel SOT23 package field effect transistor, suitable for a variety of electronic devices and modules, with the following characteristics and applications:

1. **Power management module:** Due to its negative operating voltage and moderate channel internal resistance, UT2301L-AE3-R-VB is suitable for negative power management, switching and regulation modules to improve the efficiency and reliability of power management systems.

2. **Load switch:** In circuits that require load switching, UT2301L-AE3-R-VB can be used to achieve fast and precise load switching operations to keep the system stable.

3. **Battery protection module:** Due to its P-Channel design, it can be used in battery protection circuits to prevent battery over-discharge.

4. **LED lighting system:** It can be used for current control and regulation of negative power LED lighting systems to ensure stable brightness.

Please note that specific applications require detailed evaluation in combination with circuit design and system requirements.