The **B772SSG-X-AE3-R** is a specific part number for a PNP epitaxial silicon transistor. It is widely used for power amplification and switching applications. Below is a detailed breakdown of its specifications, pinout, and characteristics. --- ### 1. General Overview This component is a **PNP Power Transistor**. It is designed for circuits requiring high current handling in a small surface-mount package. | Feature | Specification | | :--- | :--- | | **Transistor Type** | PNP | | **Material** | Silicon (Epitaxial) | | **Package Type** | SOT-223 | | **Primary Application** | Voltage Regulation, Relay Drivers, Audio Amplifier Output | --- ### 2. Absolute Maximum Ratings These values represent the stress limits of the device. Exceeding these may cause permanent damage. | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | -40 | V | | Collector-Emitter Voltage | $V_{CEO}$ | -30 | V | | Emitter-Base Voltage | $V_{EBO}$ | -5 | V | | Collector Current (DC) | $I_C$ | -3 | A | | Collector Current (Pulse) | $I_{CP}$ | -7 | A | | Total Power Dissipation | $P_D$ | 1.0 - 2.0* | W | *\*Note: Power dissipation depends heavily on PCB copper area for heat sinking.* --- ### 3. Electrical Characteristics Key performance metrics at room temperature ($25^\circ C$): | Characteristic | Symbol | Test Conditions | Min | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | **DC Current Gain** | $h_{FE}$ | $V_{CE} = -2V, I_C = -1A$ | 160 | 320 | - | | **Saturation Voltage** | $V_{CE(sat)}$ | $I_C = -2A, I_B = -0.2A$ | - | -0.5 | V | | **Transition Frequency** | $f_T$ | $V_{CE} = -5V, I_C = -0.1A$ | 80 | - | MHz | --- ### 4. Pin Configuration (SOT-223) The SOT-223 package has four terminals (three leads and one large thermal tab). ```text [ TAB ] <-- Pin 4 (Collector) _________ | _ | | |_| | |_________| | | | 1 2 3 ``` 1. **Base (B)**: Controls the flow of current between Emitter and Collector. 2. **Collector (C)**: Connected to the large Tab (Pin 4) for heat dissipation. 3. **Emitter (E)**: The source of the current carriers. --- ### 5. Part Number Decoder (UTC Convention) * **B772**: The base model (PNP complement to D882). * **SSG**: Indicates specific gain grading (usually "High" gain) and Green/Halogen-free material. * **AE3**: Refers to the **SOT-223** package type. * **R**: Tape and Reel packaging. ---