The **UD9926L-S08-R** is a specific surface-mount electronic component, primarily used in power management and battery protection circuits. Below is a detailed technical breakdown of this part. --- ## 1. General Overview The UD9926L is a **Dual N-Channel Enhancement Mode MOSFET**. It is designed to provide high-density cell design for low on-state resistance ($R_{DS(ON)}$), making it efficient for switching applications. | Feature | Specification | | :--- | :--- | | **Part Number** | UD9926L-S08-R | | **Transistor Polarity** | N-Channel (Dual) | | **Package Type** | SOP-8 | | **Configuration** | Two independent MOSFETs in one package | | **Mounting Type** | Surface Mount (SMD) | --- ## 2. Technical Specifications The typical electrical characteristics for this component are as follows: ### Electrical Ratings | Parameter | Value | | :--- | :--- | | Drain-Source Voltage ($V_{DSS}$) | 20V | | Gate-Source Voltage ($V_{GSS}$) | ±12V | | Continuous Drain Current ($I_D$) | 6.0A | | Pulsed Drain Current ($I_{DM}$) | 25A | | Max Power Dissipation ($P_D$) | 2.0W (Total) | ### Performance Characteristics * **Low $R_{DS(ON)}$:** Typically around $21m\Omega$ to $30m\Omega$ at $V_{GS} = 4.5V$. This ensures minimal heat generation during high-current operation. * **Gate Threshold Voltage ($V_{GS(th)}$):** Generally between $0.5V$ and $1.2V$, allowing it to be driven by low-voltage logic circuits. --- ## 3. Pin Configuration (SOP-8) In the SOP-8 package, the pins are typically assigned to two separate MOSFETs (M1 and M2): 1. **Pin 1:** Source 1 (S1) 2. **Pin 2:** Gate 1 (G1) 3. **Pin 3:** Source 2 (S2) 4. **Pin 4:** Gate 2 (G2) 5. **Pin 5 & 6:** Drain 2 (D2) 6. **Pin 7 & 8:** Drain 1 (D1) --- ## 4. Key Applications Because of its dual configuration and high efficiency, it is commonly used in: * **Battery Protection:** Li-ion battery pack protection circuits. * **Load Switching:** Turning on/off specific power rails in laptops or handheld devices. * **DC-DC Converters:** Small power conversion modules. * **Motor Control:** Small DC motor drivers. --- ## 5. Decoding the Part Number * **UD9926:** The basic model number for the Dual N-Channel MOSFET. * **L:** Lead-free/Halogen-free plating (RoHS compliant). * **S08:** Refers to the **SOP-8** package style. * **R:** Tape and Reel (Packaging method for automated assembly).