The **2SD882SS-P-AE3-R** is a specific variant of the popular 2SD882 NPN medium power transistor. It is widely used in power management and signal amplification circuits due to its high current capacity and low saturation voltage. ### 1. Part Number Breakdown The suffixing on this part indicates specific manufacturing standards (likely from UTC - Unisonic Technologies): | Part Segment | Meaning | | :--- | :--- | | **2SD882** | Basic part number (NPN Silicon Transistor) | | **SS** | Small Form Factor / Package Variation | | **P** | DC Current Gain ($h_{FE}$) Classification (usually 160–320) | | **AE3** | Package Type (typically SOT-23) | | **R** | Tape and Reel packaging | --- ### 2. Technical Specifications Below are the typical absolute maximum ratings and electrical characteristics for this transistor: | Parameter | Symbol | Rating | | :--- | :--- | :--- | | **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 Current (Pulse)** | $I_{CP}$ | 7 A | | **Collector Dissipation** | $P_C$ | 500 mW (Package dependent) | | **DC Current Gain** | $h_{FE}$ | 160 ~ 320 (P-Rank) | | **Transition Frequency** | $f_T$ | 150 MHz (Typ) | --- ### 3. Key Features * **High Current Capacity:** Despite its small footprint, it can handle a continuous collector current of up to 3A. * **Low Saturation Voltage:** Typically $V_{CE(sat)} \leq 0.5V$ at $I_C = 2A$, which reduces power loss and heat generation. * **Complementary Pair:** Its PNP counterpart is the **2SB772**, often used together in push-pull amplifier stages. --- ### 4. Common Applications Due to its high current and low voltage characteristics, it is found in: 1. **Voltage Regulators:** Used in linear power supply circuits. 2. **Relay Drivers:** Handling the surge currents required to energize coils. 3. **DC-DC Converters:** Acting as a switching element. 4. **Audio Amplifiers:** Specifically in the output or driver stages of small portable devices. --- ### 5. Pinout Configuration (SOT-23) For the **AE3 (SOT-23)** package, the pin mapping is usually: ```text [ 3 ] <-- Collector / \ [ 1 ] [ 2 ] ^ ^ Base Emitter ```