The **UD4P20G-S08-R** is a high-performance Power MOSFET manufactured by UTC (Unisonic Technologies). It is designed for applications requiring high efficiency and fast switching in a compact form factor. --- ## 1. General Specifications The UD4P20G is a **P-Channel Enhancement Mode Power MOSFET**. Below are the core electrical characteristics: | Parameter | Specification | |:---|:---| | **Drain-Source Voltage ($V_{DSS}$)** | -20 V | | **Gate-Source Voltage ($V_{GSS}$)** | ±12 V | | **Continuous Drain Current ($I_D$)** | -4.0 A | | **Static Drain-Source On-Resistance ($R_{DS(ON)}$)** | 62 mΩ (at $V_{GS}$ = -4.5V) | | **Package Type** | SOP-8 | | **Halogen Free / RoHS** | Yes (Suffix 'G' and 'R') | --- ## 2. Pin Configuration (SOP-8) In the SOP-8 package, the pins are typically organized to optimize heat dissipation and current flow: | Pin Number | Name | Description | |:---:|:---:|:---| | 1, 2, 3 | **S** | Source | | 4 | **G** | Gate | | 5, 6, 7, 8 | **D** | Drain | --- ## 3. Key Features * **Low On-Resistance:** The 62 mΩ resistance minimizes power loss during conduction, improving overall energy efficiency. * **Low Gate Charge:** Allows for faster switching speeds and reduces the driving requirements for the controller. * **Logic Level Compatibility:** It can be fully driven by low-voltage control signals (typically found in battery-powered devices). * **P-Channel Architecture:** Simplifies the circuit design for high-side switching because it does not require an auxiliary charge pump to turn on. --- ## 4. Typical Applications The UD4P20G is commonly used in power management circuits where space is limited: 1. **Load Switches:** Turning off power to specific sub-circuits to save battery. 2. **Battery Protection:** Integrated into BMS (Battery Management Systems) for mobile devices. 3. **DC-DC Converters:** Acting as the switching element in buck or boost regulators. 4. **Power Management in Notebooks:** Controlling power rails for peripherals. --- ## 5. Part Number Breakdown The suffixing provides information about the packaging and material: * **UD4P20**: Model Name (P-Channel, 20V). * **G**: Halogen-free and Lead-free (Green). * **S08**: SOP-8 Package. * **R**: Tape and Reel packaging.