The **2KB4004-R** is a specific electronic component typically identified as a **Single-Phase Bridge Rectifier**. These components are essential in power supply circuits for converting Alternating Current (AC) into Direct Current (DC). --- ## 1. Core Technical Specifications The part number follows a standard industry naming convention where the numbers often indicate current and voltage ratings. | Feature | Specification | Description | |:---|:---|:---| | **Component Type** | Bridge Rectifier | Full-wave rectification using 4 diodes. | | **Max Average Forward Current** | 2.0 Amperes | The maximum continuous DC output current. | | **Peak Reverse Voltage (VRRM)** | 400 Volts | The maximum voltage it can withstand in reverse bias. | | **Configuration** | Single Phase | 4-pin arrangement (2 AC inputs, 2 DC outputs). | | **Package Style** | Inline (e.g., KBJ or KBP) | Usually a flat, rectangular plastic case with 4 leads. | --- ## 2. Pin Configuration and Internal Logic The device contains four diodes internally connected in a bridge bridge circuit. * **AC Pins (~):** Two central or outer pins (depending on the specific brand's layout) where the transformer output or mains AC is connected. * **Positive (+) Pin:** The terminal where the rectified positive DC voltage is output. * **Negative (-) Pin:** The ground or return path for the DC circuit. ### Internal Circuit Representation ```text AC Input (1) | +----|----+ | v | (-) <---[D]---+---[D]---> (+) | ^ | +----|----+ | AC Input (2) ``` --- ## 3. Key Applications Because of its 2A/400V rating, the 2KB4004-R is commonly found in: 1. **AC/DC Adapters:** Converting wall outlet power for small electronics. 2. **LED Drivers:** Providing steady DC current for lighting arrays. 3. **Battery Chargers:** Initial rectification stage before voltage regulation. 4. **Home Appliances:** Powering control boards in fans, microwaves, or blenders. --- ## 4. Selection Considerations * **Heat Dissipation:** At 2A, the component may become warm. Ensure adequate airflow or trace thickness on the PCB to manage thermal energy. * **Surge Current:** Check the "Ifsm" rating (Peak Forward Surge Current) to ensure it can handle the initial "inrush" when capacitors first charge. * **Voltage Margin:** It is rated for 400V, making it suitable for 110V/220V AC mains applications with a safe safety margin.