The **2SB792-R** is a silicon PNP epitaxial planar transistor, primarily used for low-frequency power amplification and switching applications. It is often found in the output stages of audio amplifiers or in voltage regulation circuits. --- ### 1. Key Technical Specifications The "R" suffix typically denotes a specific **hFE (DC Current Gain)** classification, ensuring consistent performance in circuit designs. | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | -60 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | -60 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | -5 | V | | **Collector Current (DC)** | $I_C$ | -3 | A | | **Collector Dissipation** | $P_C$ | 10 - 20* | W | | **DC Current Gain (R Rank)** | $h_{FE}$ | 60 - 120 | - | *\*Note: Power dissipation depends significantly on the heatsink and mounting style.* --- ### 2. Physical and Structural Details The device is usually housed in a **TO-126** or **TO-220** style package (depending on the specific manufacturer like Panasonic or NEC), which allows for easy mounting to a heatsink. * **Polarity:** PNP (Current flows out of the base to turn the transistor on). * **Complementary Pair:** Often used alongside the **2SD992** (NPN) for push-pull amplifier configurations. * **Material:** Silicon (Si). --- ### 3. Common Applications Due to its moderate power handling and current capacity, the 2SB792-R is utilized in: 1. **Audio Amplifiers:** Serving as a power output stage or a driver stage for higher-power transistors. 2. **DC-DC Converters:** Used in switching circuits to manage power flow. 3. **Voltage Regulators:** Acting as a series pass element in linear power supplies. 4. **Relay Drivers:** Handling the 3A current required to trigger heavy-duty solenoids or relays. --- ### 4. Pin Configuration When looking at the front (labeled side) of a standard TO-126 package: 1. **Emitter (E):** Left Pin 2. **Collector (C):** Center Pin 3. **Base (B):** Right Pin ---