The **MPSA92G-AB3-R** is a High Voltage PNP Epitaxial Silicon Transistor manufactured by UTC (Unisonic Technologies). It is widely used in applications requiring high voltage switching and amplification. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the device: | Parameter | Symbol | Maximum Rating | Unit | | :--- | :---: | :---: | :---: | | Collector-Base Voltage | $V_{CBO}$ | -300 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -300 | V | | Emitter-Base Voltage | $V_{EBO}$ | -5.0 | V | | Collector Current (DC) | $I_C$ | -500 | mA | | Power Dissipation ($T_a = 25^\circ C$) | $P_D$ | 625 (varies by package) | mW | | DC Current Gain | $h_{FE}$ | 25 ~ 40 (min) | - | ### 2. Part Number Breakdown The suffixing in the part number provides specific information about the packaging and material: * **MPSA92**: The base model number (PNP High Voltage Transistor). * **G**: Halogen-free and RoHS compliant (Green). * **AB3**: Refers to the **SOT-89** package type (a small surface-mount plastic package). * **R**: Tape and Reel packaging. ### 3. Physical Attributes & Pinout The **SOT-89** package is a surface-mount device with three leads and a large heat-sink tab. 1. **Pin 1 (Emitter):** Current exits here in a PNP configuration. 2. **Pin 2 (Collector):** Connected to the larger center tab for heat dissipation. 3. **Pin 3 (Base):** The control pin for the transistor. ### 4. Typical Applications Due to its high voltage rating (-300V), this part is commonly found in: * **Telecommunications:** Line switching and interface circuits. * **Video Output:** Used in CRT displays and high-voltage drivers. * **Power Supplies:** High-voltage regulators and converters. * **Signal Amplification:** Low-current, high-voltage signal processing. ### 5. Complementary Part The NPN (Negative-Positive-Negative) counterpart to the MPSA92 is the **MPSA42**. Designers often use these two together in push-pull amplifier stages or balanced switching circuits. ---