The **2SD882SL-P-AB3-R** is a specific variant of the widely used 2SD882 NPN medium-power transistor. This part is commonly manufactured by UTC (Unisonic Technologies Co.) and is designed for applications requiring high current and low saturation voltage. ### 1. Part Number Breakdown Understanding the suffix helps identify the package and electrical characteristics: | Code Segment | Meaning | | :--- | :--- | | **2SD882** | Basic part number (NPN Silicon Transistor) | | **SL** | Low saturation voltage version | | **-P** | hFE (Current Gain) Rank: 160 – 320 | | **-AB3** | Package Type: SOT-89 | | **-R** | Tape & Reel packaging | --- ### 2. Key Specifications These parameters define the operational limits of the transistor: | Parameter | Symbol | Value | | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | 40 V | | Collector-Emitter Voltage | $V_{CEO}$ | 30 V | | Emitter-Base Voltage | $V_{EBO}$ | 5 V | | Collector Current (DC) | $I_C$ | 3 A | | Collector Current (Peak) | $I_{CP}$ | 7 A | | Power Dissipation ($T_a = 25^\circ C$) | $P_D$ | 0.5 W (Up to 2W on heatsink) | | DC Current Gain | $h_{FE}$ | 160 ~ 320 (P Rank) | --- ### 3. Electrical Characteristics * **Low Saturation Voltage:** The "SL" designation indicates a low $V_{CE(sat)}$, typically around **0.3V at 2A**. This reduces heat generation and improves efficiency in switching circuits. * **High Current Capacity:** Despite its small SOT-89 surface-mount footprint, it can handle a continuous 3A, making it suitable for power management. * **Complementary Pair:** The PNP equivalent for this transistor is the **2SB772**. --- ### 4. Typical Applications The 2SD882SL is versatile and usually found in the following circuits: 1. **Voltage Regulators:** Used in linear regulators for small electronic devices. 2. **Relay Drivers:** High current handling allows it to drive mechanical relays and solenoids. 3. **DC-DC Converters:** Low saturation voltage makes it efficient for switching power supplies. 4. **Audio Amplifiers:** Used in the output stage of small portable audio devices. --- ### 5. Pin Configuration (SOT-89) When looking at the labeled side of the SOT-89 package with pins pointing down: 1. **Pin 1:** Base (B) 2. **Pin 2:** Collector (C) - *Also connected to the large center tab for heat dissipation* 3. **Pin 3:** Emitter (E)