## Overview of the 2SA2029-R The **2SA2029-R** is a high-performance PNP silicon epitaxial planar transistor. It is primarily designed for general-purpose amplification and switching applications. Due to its ultra-small surface-mount package, it is commonly found in compact consumer electronics like smartphones, tablets, and portable modules. --- ### Technical Specifications The following table outlines the absolute maximum ratings and electrical characteristics for the **R** grade variant: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | -60 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | -50 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | -6 | V | | **Collector Current** | $I_C$ | -150 | mA | | **Power Dissipation** | $P_D$ | 150 | mW | | **DC Current Gain (hFE)** | $h_{FE}$ | 180 to 390 | (Rank R) | | **Transition Frequency** | $f_T$ | 140 | MHz | | **Package Type** | SOT-416 / SC-75 | EMT3 | - | --- ### Key Features * **Small Package:** Housed in an EMT3 (SOT-416) package, making it ideal for high-density circuit designs. * **Low Collector-Emitter Saturation Voltage:** Typically $V_{CE(sat)} = -0.5V$ (max) at $I_C = -50mA$, ensuring efficient switching. * **Complementary Pair:** Its NPN counterpart is the **2SC5658**. * **High Reliability:** Excellent linearity of DC current gain ($h_{FE}$). --- ### Pin Configuration | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **Base** | Controls the bias of the transistor | | 2 | **Emitter** | Current exit point for PNP | | 3 | **Collector** | Current entry point for PNP | --- ### Common Applications 1. **Small Signal Amplification:** Used in audio pre-amps or sensor signal processing. 2. **Switching:** Acting as a digital switch for low-current loads (LEDs, relays). 3. **Interface Circuits:** Level shifting between different logic voltages. 4. **Battery Powered Devices:** Due to its small footprint and low power consumption.