The **TIP41C** (often suffixed with **E3** for RoHS compliance/lead-free finishes) is a widely used NPN power transistor designed for general-purpose switching and amplification applications. --- ## 1. Technical Specifications The "C" version of the TIP41 series is the high-voltage variant, capable of handling higher collector-emitter voltages compared to the TIP41A or TIP41B. | Parameter | Value | | :--- | :--- | | **Transistor Type** | NPN | | **Collector-Emitter Voltage ($V_{CEO}$)** | 100V | | **Collector-Base Voltage ($V_{CBO}$)** | 100V | | **Continuous Collector Current ($I_C$)** | 6A | | **Peak Collector Current ($I_{CP}$)** | 10A | | **Power Dissipation ($P_D$)** | 65W (at $T_C = 25^\circ C$) | | **DC Current Gain ($h_{FE}$)** | 15 to 75 | | **Package Type** | TO-220 | --- ## 2. Pinout Configuration When looking at the front of the transistor (the side with the text/labeling) with the pins pointing downwards, the pinout is as follows: 1. **Pin 1 (Left):** Base (Control trigger) 2. **Pin 2 (Middle):** Collector (Connected to the load) 3. **Pin 3 (Right):** Emitter (Usually connected to Ground) --- ## 3. Key Features of the TIP41CE3 * **RoHS Compliant (E3):** The "E3" suffix indicates that the part uses matte tin (Sn) lead finish, meeting environmental standards for being lead-free. * **Complementary Pair:** It is often paired with the **TIP42C** (the PNP version) for use in push-pull amplifier circuits. * **High Current Handling:** Capable of driving motors, solenoids, and high-power LEDs. * **Thermal Management:** The TO-220 package features a metal tab with a hole, allowing it to be easily bolted to a heatsink to dissipate the heat generated during high-current operation. --- ## 4. Common Applications * **Power Switching:** Used in DC-DC converters and relay drivers. * **Audio Amplification:** Acts as an output stage in medium-power audio amplifiers. * **Motor Control:** Used in H-bridge circuits or as a simple on/off switch for DC motors. * **Voltage Regulation:** Can be used as a pass transistor in linear power supplies. ---