The **B772SS-X-AE3-R** is a specific variant of a PNP epitaxial silicon transistor, commonly known as the **2SB772**. This component is designed for applications requiring high current and low saturation voltage. --- ## 1. Part Number Breakdown Understanding the suffix codes helps identify the packaging and electrical grading: | Component | Description | | :--- | :--- | | **B772** | The base part number (PNP Transistor). | | **SS** | Low Voltage / High Current High-Speed switching variant. | | **X** | Represents the **hFE (Gain)** classification (typically 60–400, depending on the specific range code). | | **AE3** | Package type, typically referring to the **SOT-23** surface-mount package. | | **R** | Packaging style (Tape & Reel). | --- ## 2. Key Technical Specifications Below are the typical absolute maximum ratings for this transistor: | Parameter | Symbol | Maximum Rating | | :--- | :--- | :--- | | 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 | | Collector Dissipation | $P_C$ | 350 mW (Package dependent) | | Junction Temperature | $T_j$ | +150 °C | --- ## 3. Core Features * **High Collector Current:** Capability to handle up to 3A DC, which is very high for a small surface-mount package. * **Low Saturation Voltage:** Typically $V_{CE(sat)} = -0.5V$ at $I_C = -2A$, which ensures high efficiency and low heat generation. * **Complementary Pair:** Often used alongside the **D882 (NPN)** for push-pull amplification stages. * **Excellent Linearity:** Suitable for audio frequency power amplification. --- ## 4. Typical Applications 1. **Voltage Regulation:** Used in linear regulators for power management. 2. **Relay/Motor Driving:** Capable of switching inductive loads due to high current capacity. 3. **Audio Amplifiers:** Used in the output stage of small portable audio devices. 4. **DC-DC Converters:** Employed in switching circuits where low loss is critical. --- ## 5. Pin Configuration (SOT-23) In the SOT-23 (AE3) package, the pinout is usually standard, but always verify with the manufacturer datasheet: 1. **Base (B)** 2. **Emitter (E)** 3. **Collector (C)** ---