The **2SB792-R** is a silicon PNP epitaxial planar transistor, primarily used for low-frequency power amplification and high-speed switching. It is frequently paired with its NPN complement, the 2SD947. --- ### 1. General Specifications The "R" suffix typically denotes the **hFE (DC Current Gain)** classification, ensuring the transistor operates within a specific gain range. | Characteristic | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | -20 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -20 | V | | Emitter-Base Voltage | $V_{EBO}$ | -7 | V | | Collector Current (DC) | $I_C$ | -0.7 | A | | Collector Current (Peak) | $I_{CP}$ | -1.0 | A | | Total Power Dissipation | $P_C$ | 400 | mW | | Junction Temperature | $T_j$ | 150 | °C | --- ### 2. Electrical Characteristics (at $T_a = 25°C$) The 2SB792-R is known for its low collector-to-emitter saturation voltage, making it efficient for switching. | Parameter | Conditions | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | **hFE (Gain Rank R)** | $V_{CE} = -2V, I_C = -0.1A$ | 120 | - | 240 | - | | **Saturation Voltage** | $I_C = -0.5A, I_B = -0.05A$ | - | -0.2 | -0.5 | V | | **Transition Freq.** | $V_{CE} = -2V, I_C = -0.05A$ | - | 100 | - | MHz | --- ### 3. Key Features and Applications * **Low Saturation Voltage:** Ideal for battery-powered devices where voltage drop must be minimized. * **High Speed:** Suitable for switching circuits in telecommunications and computer peripherals. * **Package Type:** Usually found in a **TO-92** (or similar small-signal plastic package) for through-hole mounting. ### 4. Pinout Configuration When looking at the flat side (front) of a standard TO-92 package: 1. **Emitter (E)** 2. **Collector (C)** 3. **Base (B)** --- ### 5. Equivalent/Replacement Parts If the 2SB792-R is unavailable, the following parts may serve as functional substitutes (always verify pinouts and voltage limits): * **2SB766** * **BC327** (Common alternative, but check specific gain and current limits) * **2N2907** (General purpose, though lower current handling in some variants)