The **TIP107G-TN3-R** is a specific variant of the TIP107 series, which is a **PNP Epitaxial Silicon Darlington Transistor**. This component is designed for general-purpose amplifier and low-speed switching applications where high current gain is required. --- ### 1. Key Technical Specifications The "Darlington" configuration means it contains two transistors connected such that the current amplified by the first is further amplified by the second, resulting in a very high DC current gain ($h_{FE}$). | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Transistor Type** | Type | PNP Darlington | - | | **Collector-Emitter Voltage** | $V_{CEO}$ | -100 | V | | **Collector-Base Voltage** | $V_{CBO}$ | -100 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | -5 | V | | **Collector Current (DC)** | $I_C$ | -8 | A | | **Collector Current (Pulse)** | $I_{CP}$ | -15 | A | | **DC Current Gain** | $h_{FE}$ | 1000 (Min) | @ $I_C = -3A$ | | **Total Power Dissipation** | $P_D$ | 80 | W (at $T_C = 25°C$) | --- ### 2. Breakdown of the Part Number The suffix and prefix provide information about the packaging and material standards: * **TIP107**: The base model number (PNP, 100V, 8A). * **G**: Usually indicates "Green" (Halogen-free and RoHS compliant). * **TN3**: Typically refers to the package type, often **TO-252 (DPAK)** for surface mount applications. * **R**: Generally signifies "Tape & Reel" packaging for automated assembly. --- ### 3. Internal Schematic and Features Inside the TIP107G, there are integrated resistors and a diode to protect the component and improve switching performance: * **Integrated Base-Emitter Resistors**: Help the transistor turn off faster by providing a path for stored charges. * **Built-in Monolithic Free-Wheeling Diode**: Protects the transistor from reverse current spikes when driving inductive loads (like motors or relays). --- ### 4. Common Applications Due to its high gain and power handling, it is frequently used in: * **Motor Control**: Driving DC motors where small microcontrollers need to control high-current loads. * **Solenoid/Relay Drivers**: Handling the inductive kickback and high current requirements. * **Audio Amplifiers**: Functioning as an output stage power transistor. * **Power Switching**: General low-speed high-current switching. --- ### 5. Equivalent/Substitute Parts If the TIP107G-TN3-R is unavailable, the following are common alternatives (ensure package compatibility): 1. **TIP127**: Lower voltage (80V) but similar current/gain. 2. **MJD127**: The SMD (DPAK) equivalent of the TIP127. 3. **BDW94C**: A high-power PNP Darlington alternative.