### Technical Overview: 2SB956-R The **2SB956-R** is a Silicon PNP Epitaxial Planar Type Transistor. It is primarily designed for low-frequency power amplification and driver stage applications in electronic circuits. --- ### 1. Key Features * **High Current Capacity:** Designed to handle moderate current levels for its size. * **Low Saturation Voltage:** Ensures efficiency in switching applications. * **Complementary Pair:** Its NPN counterpart is typically the **2SD1276**. * **Package Type:** Usually comes in a **TO-92L** (Longer version of TO-92) or similar through-hole package, though specific surface-mount variants may exist under different suffixes. --- ### 2. Absolute Maximum Ratings ($T_a = 25^\circ C$) | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | -30 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -20 | V | | Emitter-Base Voltage | $V_{EBO}$ | -7 | V | | Collector Current (DC) | $I_C$ | -5 | A | | Collector Power Dissipation | $P_C$ | 1 | W | | Junction Temperature | $T_j$ | 150 | $^\circ C$ | --- ### 3. Electrical Characteristics & The "R" Suffix The **"R"** in 2SB956-R denotes the **hFE (DC Current Gain) classification**. Transistors are sorted into ranks based on their gain range: | Rank | hFE Range | | :--- | :--- | | **R** | **180 to 390** | | Q | 120 to 270 | | S | 270 to 520 | --- ### 4. Typical Applications 1. **Audio Amplifiers:** Used in the driver stage of low-power audio equipment. 2. **Voltage Regulators:** Functions as a pass transistor in linear power supplies. 3. **Relay Drivers:** Because of its -5A collector current rating, it can easily drive solenoids and relays. 4. **DC-DC Converters:** Useful in small-scale power conversion circuits. --- ### 5. Simple Switching Circuit Example To use this PNP transistor as a switch (active low), the load is connected between the Collector and Ground. ```markdown -Vcc (Power) | [Emitter] | [Base]--[Resistor]-- (Control Signal) | [Collector] | [Load] | Ground ```