### MPSA43-AB3-R: High Voltage NPN Transistor The **MPSA43-AB3-R** is a high-voltage NPN silicon planar epitaxial transistor. It is primarily designed for applications requiring high breakdown voltages and low current switching, such as video output stages and high-voltage drivers. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics for the MPSA43-AB3-R: | Parameter | Symbol | Maximum Rating | | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 200 V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 200 V | | **Emitter-Base Voltage** | $V_{EBO}$ | 6.0 V | | **Collector Current (DC)** | $I_C$ | 500 mA | | **Power Dissipation** | $P_D$ | 500 mW (SOT-89) | | **DC Current Gain** | $h_{FE}$ | 40 - 200 | | **Operating Junction Temp** | $T_j$ | -55 to +150 °C | --- ### 2. Physical and Ordering Information The suffix **AB3-R** specifically denotes the package type and the tape-and-reel shipping format used by manufacturers like **UTC (Unisonic Technologies)**. * **Package Type:** SOT-89 (Small Outline Transistor). * **Mounting Type:** Surface Mount (SMD). * **Configuration:** Single NPN. * **RoHS Status:** Lead-free and Halogen-free (denoted by the "R" suffix in many naming conventions). --- ### 3. Pin Configuration (SOT-89) The SOT-89 package typically follows this pinout when looking at the branded side: 1. **Emitter (E):** The output lead for the current. 2. **Collector (C):** The middle lead (and the large thermal tab). 3. **Base (B):** The input/control lead. --- ### 4. Typical Applications Due to its high voltage rating ($200V$), this part is commonly used in: * **Telecommunications:** Line switching and ringing circuits. * **Display Drivers:** Video output stages in CRT monitors or high-voltage LED drivers. * **Industrial Controls:** Interfacing low-voltage logic with high-voltage loads. * **Power Supplies:** Startup circuits and voltage regulators. --- ### 5. Part Number Breakdown ```text MPSA43 - AB3 - R | | | | | +-- R: Tape and Reel (Packaging) | +------- AB3: Package Code (SOT-89) +--------------- Base Part Number (High Voltage NPN) ```