The **2SA1415-R-HF** is a high-speed switching, PNP epitaxial silicon transistor designed primarily for high-voltage control and switching applications. Below is a detailed technical breakdown of this electronic component. ### 1. Key Specifications & Ratings The "R" in the part number typically refers to the DC Current Gain ($h_{FE}$) classification, and "HF" signifies that the component is **Halogen-Free**. | Parameter | Symbol | Maximum Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | -180 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -160 | V | | Emitter-Base Voltage | $V_{EBO}$ | -6 | V | | Collector Current (DC) | $I_C$ | -0.14 | A (140mA) | | Collector Dissipation | $P_C$ | 500 | mW | | Junction Temperature | $T_j$ | 150 | °C | --- ### 2. Physical and Material Characteristics * **Polarity:** PNP (Complementary to 2SC3645). * **Package Type:** Usually found in a small-signal plastic package (like SOT-89 or TO-92MOD depending on the specific manufacturer series). * **Environmental Standard:** Halogen-free and RoHS compliant, making it suitable for modern eco-friendly manufacturing. --- ### 3. Electrical Characteristics ($T_a = 25°C$) The transistor is characterized by its low capacitance and high-frequency performance. | Characteristic | Conditions | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | **Current Gain ($h_{FE}$)** | $V_{CE} = -5V, I_C = -10mA$ | 100 | - | 400 | - | | **Saturation Voltage ($V_{CE(sat)}$)** | $I_C = -50mA, I_B = -5mA$ | - | - | -0.5 | V | | **Gain Bandwidth ($f_T$)** | $V_{CE} = -10V, I_C = -20mA$ | - | 120 | - | MHz | | **Output Capacitance ($C_{ob}$)** | $V_{CB} = -10V, f = 1MHz$ | - | 3.5 | - | pF | --- ### 4. Primary Applications The 2SA1415-R-HF is optimized for specific electronic circuits: 1. **High-Voltage Switching:** Used in circuits requiring a breakdown voltage up to 160V. 2. **Video Output:** Often utilized in CRT displays or high-definition video processing due to its low output capacitance ($C_{ob}$). 3. **Driver Circuits:** Acts as a driver for high-voltage power transistors or relay control. 4. **Audio Amplification:** Suitable for the voltage gain stages in high-fidelity audio amplifiers. --- ### 5. Circuit Symbol & Pinout ```text C (Collector) | --| B --| < (Emitter Arrow pointing IN for PNP) --| | E (Emitter) ```