**QM2421K-VB Detailed parameter description:**

- **Brand:** VBsemi
- **Silkscreen:** VB2290
- **Package:** SOT23
- **Channel type:** P-Channel
- **Maximum voltage:** -20V
- **Maximum current:** -4A
- **On-resistance:** RDS(ON)=57mΩ@VGS=4.5V,VGS=12V
- **Threshold voltage:** Vth=-0.81V

**Application introduction:**
QM2421K-VB is a P-Channel MOSFET suitable for a variety of application scenarios. The following are the main application areas and corresponding modules of this product:

1. **Power switch module:** Since QM2421K-VB has P-Channel channel characteristics, it is suitable for power switch modules. It can be used to provide efficient switching functions in power systems.

2. **Portable devices:** This product is suitable for portable devices such as smartphones, tablets, etc. Its SOT23 package makes it very suitable for power control in limited space.

3. **Battery management system:** In battery management systems that need to switch and control batteries, QM2421K-VB can play its advantages and improve battery efficiency.

4. **LED lighting driver:** Suitable for LED lighting driver modules, it can be used to switch and control LED lights to achieve light brightness adjustment.

5. **Power adapter:** In power adapters, QM2421K-VB can be used for power switching and control, which helps to achieve efficient power conversion and adaptation.

Overall, QM2421K-VB is a P-Channel MOSFET suitable for a variety of power management applications, especially for limited space and high power efficiency requirements.