The **TIP107L-TN3-R** is an epitaxial silicon PNP Darlington transistor. It is widely used in medium-power switching and amplification applications where high current gain is required. --- ## 1. Technical Specifications The following table summarizes the key electrical characteristics of the TIP107L-TN3-R: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **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 (Peak)** | $I_{CP}$ | -15 | A | | **DC Current Gain** | $h_{FE}$ | 1000 (Min) | - | | **Total Power Dissipation** | $P_D$ | 2 ($T_A=25^\circ C$) | W | | **Package Type** | TO-252 | (D-PAK) | - | --- ## 2. Key Internal Features The "Darlington" configuration means this part contains two transistors connected in a specific way to provide extremely high gain. ### Internal Components: * **Two PNP Transistors:** Cascaded so that the emitter of the first drives the base of the second. * **Base-Emitter Shunt Resistors:** Integrated to help the device turn off faster and improve thermal stability. * **Integrated Anti-Parallel Diode:** A built-in diode between the Collector and Emitter protects the transistor against inductive back-EMF (useful when driving motors or relays). --- ## 3. Package and Ordering Logic The Part Number **TIP107L-TN3-R** breaks down as follows: * **TIP107:** The base model (PNP Darlington, 100V, 8A). * **L:** Lead-free/Halogen-free (Environmentally compliant). * **TN3:** Refers to the **TO-252** (D-PAK) surface mount package. * **R:** Tape and Reel packaging for automated assembly. --- ## 4. Typical Applications Due to its high gain and current handling, it is commonly used in: 1. **Industrial Controls:** Driving heavy solenoids and relays. 2. **Motor Drivers:** High-side switching in DC motor circuits. 3. **Power Linear Amplifiers:** Audio output stages. 4. **Voltage Regulators:** Pass transistors for power supplies. --- ## 5. Equivalent Circuit Representation The Darlington pair can be visualized as a single "super" transistor: ```text C (Collector) | --+-- | | | | [R1]| <--- Integrated Resistors | | | B--|--+--|-- E (Emitter) (Base) | [R2] ```