Product introduction：
1. Product Introduction (WST3403-VB)
WST3403-VB is a unipolar P-channel MOSFET in SOT23-3 package, designed for low power and high efficiency applications. The maximum drain-source voltage (VDS) of this product is -30V, the gate-source voltage (VGS) is ±20V, and the threshold voltage (Vth) is -1.7V, which is suitable for negative power supply and load switch control. The on-resistance (RDS(ON)) of this MOSFET is 46mΩ at VGS = 10V and 54mΩ at VGS = 4.5V, with low on-resistance and high current carrying capacity. The maximum drain current (ID) is -5.6A, which can meet the switching requirements of medium power loads. The WST3403-VB using Trench process provides high switching efficiency and low switching loss, and is suitable for applications such as power management, switching power supplies, and protection circuits.
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Product parameter：
| VB Package |
Configuration |
VDS(V) |
VGS |
Vthyp（V） |
ID(A) |
Rds2.5 |
Rds4.5 |
Rds10 |
Technology |
| SOT23-3 |
Single-P |
-30V |
20（±V） |
-1.7V |
-5.6A |
|
|
46mΩ |
|
2. Detailed parameter description
| **Parameter** | **Description** |
|-------------------------|--------------------------------------------------------------------------|
| **Model** | WST3403-VB |
| **Package** | SOT23-3 |
| **Configuration** | Unipolar P-channel|
| **Maximum drain-source voltage (VDS)** | -30V |
| **Gate-source voltage (VGS)** | ±20V |
| **Threshold voltage (Vth)** | -1.7V |
| **On-resistance (RDS(ON))** | 54mΩ (VGS=4.5V), 46mΩ (VGS=10V) |
| **Maximum drain current (ID)** | -5.6A |
| **Technology type** | Trench technology|
- **VDS**: Maximum drain-source voltage is -30V, suitable for negative power switch control.
- **VGS**: Gate-source voltage is ±20V, which meets the common control voltage range and is compatible with microcontrollers and logic circuits.
- **Vth**: Threshold voltage is -1.7V, ensuring that the MOSFET can be turned on at a lower gate voltage.
- **RDS(ON)**: At VGS=10V, the on-resistance is 46mΩ; at VGS=4.5V, it is 54mΩ, suitable for medium power and medium current applications.
- **ID**: Maximum drain current is -5.6A, suitable for higher current load control.
Domain and module applications：
3. Applicable fields and modules
WST3403-VB is suitable for the following fields and modules:
- **Negative power switch control**: The maximum drain-source voltage of WST3403-VB is -30V, which is suitable for the control and management of negative power, such as negative voltage DC-DC converters, negative voltage linear regulators, etc. Due to its low on-resistance, it can improve power efficiency and reduce heat loss.
- **Power management system**: This MOSFET is suitable for battery management systems, power distribution and power switching systems, in which energy transfer and control need to be optimized through efficient switching operations. The higher current carrying capacity of WST3403-VB makes it adaptable to a variety of power management modules.
- **Load switch and battery protection circuit**: WST3403-VB can be used in various load switch circuits, especially in battery protection circuits, when it is necessary to control the start and stop or switch state of the load through P-channel MOSFET, it performs well. For example, in portable devices, communication equipment and other scenarios, functions such as battery charging and overvoltage/overcurrent protection can be realized.
- **Low-power portable devices**: The low RDS(ON) characteristics of this MOSFET make it suitable for low-power portable devices such as smart watches, portable speakers, battery-powered sensors, etc. In these devices, the WST3403-VB can be used to provide negative power management, optimize energy transfer and extend the battery life of the device.
- **Power tools and automotive electronics**: This MOSFET can also be used in negative voltage control systems, such as power tools, electric vehicle battery management and load control. Its voltage resistance and conduction performance enable it to play an important role in the battery management system of power tools and vehicles.
- **Automation and industrial control systems**: In automation and industrial control systems, the WST3403-VB can be used to control power switches or load switches, providing reliable negative voltage switch control. The higher current carrying capacity of this MOSFET is very suitable for high-power switch control or current load management.
In short, WST3403-VB is a P-channel MOSFET that is very suitable for low-power negative power switches and power management systems. Its low on-resistance, high current carrying capacity and reliable voltage resistance make it widely used in portable devices, battery management, automation control and other fields.
* Please note: the above is only an example application scenario, the specific application depends on the requirements and conditions of the system design. When using this device, consult its data sheet for detailed technical specifications and features
Technical support：
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