The **MPSA92ML-T92-R** is a high-voltage, PNP epitaxial silicon transistor designed primarily for high-voltage switching and amplification applications. It is frequently used in circuits involving telephone lines, video output stages, and power supply regulators. --- ### 1. Technical Specifications Below are the key electrical characteristics and absolute maximum ratings for 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 (Continuous)** | $I_C$ | -500 | mA | | **Power Dissipation ($T_a = 25^\circ C$)** | $P_D$ | 625 | mW | | **DC Current Gain** | $h_{FE}$ | 25 - 40 (min) | - | | **Current Gain Bandwidth Product** | $f_T$ | 50 | MHz | --- ### 2. Breakdown of the Part Number The nomenclature typically follows manufacturer-specific coding (often UTC or similar): * **MPSA92**: The industry-standard base part number for a PNP high-voltage transistor. * **ML**: Often indicates a specific lead-free or "Green" halogen-free material compliance. * **T92**: Refers to the **TO-92** package style (standard through-hole plastic package). * **R**: Generally denotes the tape-and-reel (or Ammo) packaging format for automated assembly. --- ### 3. Pin Configuration The TO-92 package has three leads. Viewed from the flat side with leads pointing down: 1. **Emitter (E):** Current exits the transistor here. 2. **Base (B):** Controls the state of the transistor. 3. **Collector (C):** High-voltage side where current enters. --- ### 4. Typical Applications Due to its high voltage rating (-300V), this component is ideal for: * **Inverters:** High-voltage switching circuits. * **Telecommunications:** Signal processing on 48V or higher phone lines. * **Video Stages:** Driving CRT cathode outputs or high-voltage displays. * **Level Shifters:** Moving signals between low-voltage logic and high-voltage rails. --- ### 5. Complementary Pair The NPN (Negative-Positive-Negative) complement to the MPSA92 is the **MPSA42**. Designers often use these together in push-pull configurations or balanced high-voltage amplifiers.