The **2SD882SL-P-T92-R** is a specific part number for a NPN medium power transistor. It is widely used in voltage regulation, relay drivers, and generic switching applications due to its high current capacity relative to its size. --- ### 1. Part Number Breakdown The nomenclature reveals specific characteristics defined by the manufacturer (likely UTC - Unisonic Technologies): | Segment | Meaning | | :--- | :--- | | **2SD882** | The core transistor model (NPN Medium Power). | | **SL** | Low saturation voltage version. | | **P** | Rank/hFE (Current Gain) classification. | | **T92** | Package type (TO-92). | | **R** | Packing type (usually Tape & Reel or Ammo Pack). | --- ### 2. Technical Specifications Below are the typical absolute 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 | $V_{EBO}$ | 6 V | | Collector Current (DC) | $I_C$ | 3 A | | Collector Dissipation | $P_C$ | 750 mW (in TO-92 package) | | DC Current Gain | $h_{FE}$ | 160 – 320 (P Rank) | | Transition Frequency | $f_T$ | 90 MHz (Typ) | --- ### 3. Key Features * **High Current Capacity:** Despite the small TO-92 form factor, it can handle up to 3A of collector current, making it much more powerful than a standard 2N2222 or BC547. * **Low Saturation Voltage:** The "SL" variant ensures that the voltage drop across the collector and emitter ($V_{CE(sat)}$) is minimized when the transistor is fully ON, reducing heat and power loss. * **NPN Polarity:** It is a negative-positive-negative transistor, meaning it is activated by a positive current at the base. --- ### 4. Pin Configuration (TO-92) When looking at the flat side of the transistor with the leads pointing down, the pinout is typically: 1. **Emitter (E)** 2. **Collector (C)** 3. **Base (B)** --- ### 5. Common Applications * **Power Management:** Used in DC-DC converters and voltage regulators. * **Motor Control:** Driving small DC motors or actuators. * **Audio Amplification:** Output stages for low-power audio amplifiers. * **Relay Switching:** Triggering high-current relays from low-power microcontroller pins.