The **2SB1202-R-TM3-K** is a high-current, low-saturation voltage PNP epitaxial planar silicon transistor. It is widely used in power management and switching applications due to its high efficiency and compact form factor. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the device: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | -60 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | -50 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | -6 | V | | **Collector Current (DC)** | $I_C$ | -3 | A | | **Collector Current (Pulse)** | $I_{CP}$ | -6 | A | | **Power Dissipation ($T_c=25^\circ C$)** | $P_C$ | 15 | W | | **DC Current Gain** | $h_{FE}$ | 100 to 200 (R-Rank) | - | | **Saturation Voltage (Max)** | $V_{CE(sat)}$ | -0.7 | V | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the manufacturing and electrical grading: * **2SB1202**: The base model number (PNP Transistor). * **R**: The **hFE (Gain) Classification**. The "R" rank typically signifies a DC current gain range of 100 to 200. * **TM3**: Refers to the **Package Type**. In this case, it usually denotes a **TO-251 (IPAK)** package, which is a vertical, through-hole variant of the DPAK. * **K**: Often indicates a specific packing style (e.g., Tube or Bulk) or a Halogen-free/Lead-free requirement depending on the manufacturer (typically UTC - Unisonic Technologies). --- ### 3. Features and Advantages 1. **High Current Capacity**: Capable of handling up to 3A continuously, making it suitable for medium-power driving. 2. **Low Saturation Voltage**: It minimizes power loss during the "ON" state, which reduces heat generation and improves circuit efficiency. 3. **Fast Switching**: High-speed transition capabilities allow it to be used in high-frequency converters. 4. **Complementary Pair**: Its NPN counterpart is the **2SD1802**, often used together in push-pull amplifier configurations. --- ### 4. Common Applications * **Voltage Regulators**: Used in linear and switching power supplies. * **Relay/Solenoid Drivers**: High current capability allows it to drive mechanical components easily. * **DC-DC Converters**: Efficiency in low-voltage power conversion. * **Motor Control**: Small DC motor speed and direction control. ---