## Detailed Overview of the 2SB1182-R Transistor The **2SB1182-R** is a high-performance **PNP Epitaxial Planar Silicon Transistor** primarily used for power amplification and high-current switching applications. It is often paired with its NPN complement, the 2SD1758. --- ### 1. Key Technical Specifications The "R" suffix typically denotes the **hFE (DC Current Gain)** classification, which usually falls in the range of 100 to 200. | Parameter | Symbol | Maximum Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | -40 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -32 | V | | Emitter-Base Voltage | $V_{EBO}$ | -5 | V | | Collector Current (DC) | $I_C$ | -2 | A | | Collector Current (Pulse) | $I_{CP}$ | -3 | A | | Collector Power Dissipation | $P_C$ | 1 to 10* | W | | Junction Temperature | $T_j$ | 150 | °C | *\*Note: Power dissipation varies based on mounting (e.g., on a PCB vs. a heat sink).* --- ### 2. Physical Characteristics and Packaging The 2SB1182-R is commonly found in the **ATV** or **DPAK (TO-252)** surface-mount packages, making it suitable for automated assembly. * **Low Saturation Voltage:** Typically $V_{CE(sat)} = -0.5V$ (max) at $I_C = -1A$. * **High Current Capacity:** Despite its small footprint, it handles up to 2A of continuous current. * **Complementary Pair:** 2SD1758 (NPN). --- ### 3. Pin Configuration For the standard TO-252 (DPAK) package, the pinout is generally as follows: | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **Base** | Controls the biasing of the transistor | | 2 | **Collector** | Connected to the load (connected to the large tab) | | 3 | **Emitter** | Usually connected to the supply rail in PNP circuits | --- ### 4. Common Applications * **Voltage Regulation:** Used in linear regulators for low-voltage drop applications. * **Switching:** Driving solenoids, motors, or high-power LEDs. * **Power Amplification:** Audio output stages or signal amplification in industrial equipment. * **DC-DC Converters:** Serving as a pass transistor. ---