The **MPSA92L-AB3-R** is a High Voltage PNP Epitaxial Silicon Transistor. It is widely used in applications requiring high voltage handling and fast switching, particularly in telecommunications and power supply circuits. --- ### 1. Key Technical Specifications The following table outlines the fundamental electrical characteristics of the MPSA92L-AB3-R: | Parameter | Symbol | Maximum Rating | | :--- | :---: | :--- | | **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 | | **Collector Power Dissipation** | $P_C$ | 625 mW (varies by package) | | **Junction Temperature** | $T_j$ | +150 °C | --- ### 2. Package and Part Suffix Breakdown The part number **MPSA92L-AB3-R** contains specific information about its manufacturing and packaging: * **MPSA92**: The base model number (PNP High Voltage Transistor). * **L**: Often denotes "Lead-Free" or specific low-power/low-noise characteristics depending on the manufacturer (e.g., UTC). * **AB3**: Typically refers to the **SOT-89** package type (a small, surface-mount plastic package with a heat sink tab). * **R**: Generally indicates the packaging method, such as **Tape and Reel**. --- ### 3. Pin Configuration (SOT-89) When looking at the front of the SOT-89 package (pins pointing down), the layout is usually: 1. **Emitter (E)** 2. **Collector (C)** - Also connected to the large center tab for heat dissipation. 3. **Base (B)** --- ### 4. Typical Applications Due to its high voltage rating (-300V), this transistor is commonly found in: * **Telephony:** Line switching and ring detection circuits. * **Power Supplies:** High-voltage regulators and DC-DC converters. * **Display Drivers:** Driving gas-discharge displays or high-voltage LED strings. * **Amplifiers:** High-voltage video output stages. --- ### 5. Complementary NPN Part In many push-pull or symmetrical circuit designs, the MPSA92 (PNP) is paired with its NPN counterpart: * **Complementary NPN:** MPSA42