## Detailed Technical Overview of 2SD882SSL-E-AE3-R The **2SD882SSL-E-AE3-R** is a specific variant of the widely used D882 NPN medium-power transistor. It is manufactured by **UTC (Unisonic Technologies)**. This component is designed for applications requiring high current and low saturation voltage. ### 1. Part Number Breakdown Understanding the suffix codes is crucial for identifying the physical and electrical characteristics of this specific variant: | Part Segment | Meaning | | :--- | :--- | | **2SD882** | Base part number (NPN Silicon Transistor) | | **SSL** | High $h_{FE}$ (Gain) classification or specific die size variant | | **E** | $h_{FE}$ Rank (typically indicates a gain range of 200–400) | | **AE3** | Package Type: **SOT-23** (Surface Mount Device) | | **R** | Tape and Reel packaging | --- ### 2. Key Electrical Specifications Below are the absolute maximum ratings and typical electrical characteristics for this transistor: | Parameter | Symbol | Maximum Rating | | :--- | :--- | :--- | | 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 (Package dependent) | | DC Current Gain | $h_{FE}$ | 200 ~ 400 (Rank E) | | Transition Frequency | $f_T$ | 100 MHz (Typ) | --- ### 3. Pinout Configuration Since this is the **AE3 (SOT-23)** package, the pinout follows the standard surface mount small-outline transistor configuration: ```text (3) Collector | ------- | | (1) B-| |- (2) Emitter ------- ``` 1. **Pin 1:** Base 2. **Pin 2:** Emitter 3. **Pin 3:** Collector --- ### 4. Features & Applications #### Features * **High Current Capacity:** Able to handle up to 3A, which is high for a small SOT-23 package. * **Low Saturation Voltage:** $V_{CE(sat)}$ is typically only 0.3V at $I_C=2A$, leading to higher efficiency and less heat. * **Complementary Pair:** Often used alongside the **2SB772** (PNP version). #### Common Applications * **Voltage Regulation:** Used in linear regulators for power management. * **Relay Drivers:** Ideal for switching magnetic coils due to high current handling. * **Audio Amplification:** Output stage for low-power portable audio devices. * **DC-DC Converters:** Used in the switching stage of small power converters. --- ### 5. Thermal Considerations Because the **AE3 (SOT-23)** package is very small, thermal management is critical. While the transistor can handle 3A of current, the package cannot dissipate significant heat (0.5W max). In high-current applications, the transistor should be used in **switching mode** (fully on or fully off) rather than linear mode to prevent thermal runaway.