The **13003ADGP-T92-R** is a specific variant of the 13003 series high-voltage NPN power transistor. These transistors are widely used in power conversion circuits due to their high switching speed and high voltage tolerance. ### 1. Technical Specifications The "13003" family is part of the MJE13003 lineage. Below are the typical electrical characteristics for this specific part: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Emitter Voltage** | $V_{CEO}$ | 400 - 450 | Volts | | **Collector-Base Voltage** | $V_{CBO}$ | 700 | Volts | | **Collector Current (DC)** | $I_C$ | 1.5 | Amperes | | **Power Dissipation** | $P_{tot}$ | 1.0 - 1.1 | Watts | | **Junction Temperature** | $T_j$ | 150 | °C | | **Package Type** | TO-92 | Through-hole | - | --- ### 2. Decoding the Part Number The suffix codes usually refer to manufacturer-specific standards or packaging details: * **13003A**: High-voltage NPN power transistor core. * **DGP**: Often indicates a specific gain ($h_{FE}$) grouping or internal diode protection (depending on the manufacturer, such as UTC or Fairchild). * **T92**: Refers to the **TO-92** plastic package style (small, 3-pin). * **R**: Generally stands for "RoHS Compliant" or "Reel" (packaging format). --- ### 3. Key Features * **High Voltage Capability**: Designed to handle mains voltage after rectification (up to 700V peak). * **Fast Switching**: Optimized for high-frequency switching environments. * **Small Footprint**: The TO-92 package is compact, making it ideal for space-constrained electronics. * **NPN Polarity**: Controlled by a positive base current. --- ### 4. Common Applications This transistor is predominantly found in low-power AC-to-DC conversion devices: 1. **LED Drivers**: Used as the primary switching element in small LED bulbs and strips. 2. **Compact Chargers**: Found in mobile phone chargers and small power adapters. 3. **Electronic Ballasts**: Used in fluorescent lamp starters. 4. **Energy Saving Lamps (CFL)**: A staple component in the oscillation circuit of CFL bulbs. --- ### 5. Pin Configuration (TO-92) Looking at the flat side of the transistor with the pins pointing down: 1. **Pin 1: Emitter (E)** 2. **Pin 2: Collector (C)** 3. **Pin 3: Base (B)** *(Note: Always verify with the specific manufacturer datasheet, as some variants may swap Emitter and Base).*