The **2SD882SL-X-AB3-R** is a specific variant of the widely used 2SD882 (or D882) NPN medium-power transistor. It is designed for applications requiring high current and low saturation voltage. ### 1. Part Number Breakdown Understanding the suffix codes helps identify the specific physical and electrical characteristics: | Part Segment | Meaning | | :--- | :--- | | **2SD882** | Base part number (NPN Silicon Transistor) | | **SL** | Low Saturation Voltage variant | | **X** | HFE (Gain) classification (typically 60–400 range, specific to X) | | **AB3** | Package Type: **SOT-89** (Surface Mount) | | **R** | Packing style (Tape & Reel) | --- ### 2. Technical Specifications Below are the typical maximum ratings and electrical characteristics for this component: | Parameter | Symbol | Value | | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 40 V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 30 V | | **Emitter-Base Voltage** | $V_{EBO}$ | 5.0 V | | **Collector Current (DC)** | $I_C$ | 3.0 A | | **Collector Current (Pulse)** | $I_{CP}$ | 7.0 A | | **Collector Dissipation ($T_a=25°C$)** | $P_C$ | 0.5 W (SOT-89) | | **DC Current Gain** | $h_{FE}$ | 160 – 320 (X rank) | | **Saturation Voltage** | $V_{CE(sat)}$ | 0.5 V Max (@ 2A $I_C$) | --- ### 3. Key Features * **High Current Capacity:** Can handle up to 3A of continuous current, which is high for its small SOT-89 footprint. * **Low Saturation Voltage:** The "SL" designation indicates optimized performance for switching, resulting in lower heat dissipation during the "ON" state. * **Complementary Pair:** Often used alongside the **2SB772** (PNP version) for push-pull amplifier circuits. * **Surface Mount:** The AB3 (SOT-89) package is ideal for automated assembly in compact electronic devices. --- ### 4. Common Applications * **Voltage Regulation:** Used in linear regulators and power supply circuits. * **Relay/Motor Drivers:** Its 3A capacity makes it suitable for driving small DC motors or high-current relays. * **Audio Amplifiers:** Used in the output stage of low-power amplifiers or as a driver for high-power stages. * **DC-DC Converters:** Utilized in switching power circuits due to its low $V_{CE(sat)}$. --- ### 5. Pin Configuration (SOT-89) When looking at the front of the transistor (part markings visible, pins pointing down): 1. **Pin 1:** Emitter 2. **Pin 2/Tab:** Collector (The large center tab is also the Collector for heat sinking) 3. **Pin 3:** Base