The **13005BAL-T92-R** is a high-voltage, high-speed switching NPN power transistor. It is part of the "13005" family, which is industry-standard for applications involving AC-to-DC power conversion. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics for this specific part: | Parameter | Symbol | Typical Value | | :--- | :--- | :--- | | **Collector-Emitter Voltage** | $V_{CEO}$ | 400V | | **Collector-Base Voltage** | $V_{CBO}$ | 700V | | **Collector Current (DC)** | $I_C$ | 2.0A | | **Collector Current (Pulse)** | $I_{CP}$ | 4.0A | | **Total Power Dissipation** | $P_D$ | 1.0W - 1.5W (varies by heatsink) | | **Package Type** | TO-92 | (Small plastic package) | --- ### 2. Part Number Breakdown Understanding the suffix helps identify the specific variant: * **13005**: The base model number (MJE13005 family). * **BAL**: Often indicates a specific gain ($h_{FE}$) range or internal construction (Base-Emitter resistor/diode configurations). * **T92**: Refers to the **TO-92** physical package (three-lead plastic). * **R**: Usually denotes "Tape & Reel" or "Ammo Pack" packaging for automated assembly. --- ### 3. Applications Due to its high voltage rating and fast switching speeds, this transistor is commonly found in: 1. **Electronic Ballasts:** Used in fluorescent lighting. 2. **Switch Mode Power Supplies (SMPS):** Used as the primary switching element in low-power adapters (e.g., cell phone chargers). 3. **DC-DC Converters:** High-speed power conversion circuits. 4. **Motor Controls:** Small motor driving applications requiring high voltage tolerance. --- ### 4. Pin Configuration (TO-92) When looking at the flat side of the transistor with the leads pointing down: 1. **Pin 1:** Emitter (E) 2. **Pin 2:** Collector (C) 3. **Pin 3:** Base (B) > **Warning:** Always verify the specific manufacturer's datasheet (e.g., UTC, Silicore) as pinouts can occasionally vary between brands in the TO-92 form factor.