The **MPSA93L-AB3-R** is a High Voltage PNP Epitaxial Silicon Transistor. It is specifically designed for applications requiring high breakdown voltages, such as telephony, video output stages, and high-voltage switching. --- ### 1. Key Technical Specifications The table below highlights the primary electrical characteristics of the MPSA93L-AB3-R: | Parameter | Symbol | Maximum Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | -200 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -200 | V | | Emitter-Base Voltage | $V_{EBO}$ | -5.0 | V | | Collector Current (Continuous) | $I_C$ | -500 | mA | | Total Power Dissipation ($T_A = 25^\circ C$) | $P_D$ | 625 | mW | | DC Current Gain ($h_{FE}$) | $h_{FE}$ | 40 - 200 | - | --- ### 2. Breakdown of the Part Number The nomenclature provides specific details regarding the manufacturing and packaging: * **MPSA93**: The base part number (PNP High Voltage Transistor). * **L**: Lead-free (RoHS compliant). * **AB3**: Refers to the **SOT-89** package type (commonly used in surface mount applications). * **R**: Tape and Reel packaging (indicates the method of delivery for automated assembly). --- ### 3. Application Areas Due to its high voltage rating (-200V), this part is commonly found in the following circuits: 1. **Telecommunications**: Used in line-switching circuits and interface modules. 2. **Display Drivers**: High-voltage video output stages in older CRT monitors or specialized industrial displays. 3. **Power Supplies**: In the startup or feedback circuits of high-voltage SMPS (Switched-Mode Power Supplies). 4. **Signal Inversion**: High-side switching in industrial control systems. --- ### 4. Circuit Symbol and Pinout (SOT-89) ```text [ SOT-89 ] _______ | 2 | <-- Collector (Large Tab) ___|_______|___ | 1 2 3 | |___|___|___|___| | | | B C E ``` * **Pin 1 (Base):** Controls the flow of current between Emitter and Collector. * **Pin 2 (Collector):** Connected to the higher negative potential in PNP configuration. * **Pin 3 (Emitter):** Usually connected to the positive rail or signal source in PNP circuits.