## 2SB1119-R: High-Current PNP Epitaxial Planar Silicon Transistor The **2SB1119-R** is a high-performance PNP power transistor designed primarily for high-current switching applications. It is part of the Sanyo (now ON Semiconductor) family of transistors and is known for its low saturation voltage and high speed. --- ### 1. General Specifications The "R" suffix typically refers to the **hFE (DC Current Gain)** classification range, ensuring specific performance characteristics within a circuit. | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | -30 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -25 | V | | Emitter-Base Voltage | $V_{EBO}$ | -7 | V | | Collector Current (DC) | $I_C$ | -4 | A | | Collector Current (Pulse) | $I_{CP}$ | -7 | A | | Total Power Dissipation | $P_C$ | 1.3 to 15* | W | | Junction Temperature | $T_j$ | 150 | °C | *\*Note: 1.3W in free air; up to 15W with a suitable heat sink.* --- ### 2. Key Features * **Low Saturation Voltage:** $V_{CE(sat)}$ is remarkably low, typically around -0.5V at $I_C = -2A$, which reduces power loss and heat generation. * **High Current Capacity:** Despite its relatively small footprint, it can handle a continuous DC current of up to 4 Amps. * **High-Speed Switching:** Optimized for applications requiring rapid transitions between ON and OFF states. * **Complementary Pair:** Its NPN counterpart is the **2SD1619**. --- ### 3. Pin Configuration (Typical TO-126 / TP Package) Most 2SB1119 transistors come in a through-hole package like the TO-126 or TP-FA. | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **Emitter** | Current exits the transistor. | | 2 | **Collector** | Connected to the load. | | 3 | **Base** | Controls the transistor's state. | --- ### 4. Common Applications Due to its high current handling and low saturation, the 2SB1119-R is frequently found in: 1. **Voltage Regulators:** Used in linear or switching power supplies. 2. **Relay Drivers:** High current capacity allows it to drive large mechanical relays. 3. **Motor Control:** Small DC motor speed and direction control (H-bridges). 4. **Audio Amplifiers:** Used in the output stage or driver stage of power amplifiers. --- ### 5. Gain Classification (hFE) The "R" designation specifies the DC current gain range: ```text Classification: R hFE Range: 100 to 200 ```