The **2PA4-R** is a specific surface-mount electronic component, typically categorized as an NPN General Purpose Transistor. It is commonly found in a SOT-23 package and is designed for low-power switching and amplification tasks. --- ### ## Technical Specifications The following table highlights the core electrical characteristics for the 2PA4-R: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Emitter Voltage** | $V_{CEO}$ | 45 | V | | **Collector-Base Voltage** | $V_{CBO}$ | 50 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 6 | V | | **Continuous Collector Current** | $I_C$ | 100 | mA | | **Power Dissipation** | $P_{tot}$ | 250 | mW | | **DC Current Gain** | $h_{FE}$ | 200 - 450 | (R Class) | --- ### ### Key Features and Classification 1. **Transistor Type:** It is an **NPN** Bipolar Junction Transistor (BJT). 2. **Gain Classification:** The suffix **"-R"** denotes a specific DC Current Gain ($h_{FE}$) range. In this series, "R" usually indicates a high-gain classification (typically between 200 and 450), ensuring efficient signal amplification. 3. **Package Style:** It utilizes the **SOT-23** plastic surface-mounted package, which is ideal for space-constrained PCB designs. 4. **Complementary Part:** The PNP counterpart for this device is often the **2PC4-R**. ### ### Typical Applications * **Small Signal Amplification:** Used in audio pre-amps or sensor signal processing. * **Switching:** Acting as a digital switch to control LEDs or small relays. * **Driver Circuits:** Driving the base of larger power transistors. --- ### ### Pinout Configuration (SOT-23) When looking at the top of the component with the single pin at the top: ```text [ 3 ] <-- Collector / \ [ 1 ] [ 2 ] Base Emitter ```