The **FCR-0B-R** is a specific electronic component, typically categorized as a **Surface Mount Device (SMD) Fused Resistor** or a **Chip Resistor** often used in automotive and industrial power electronics. These components are designed to serve two purposes: acting as a standard resistor under normal conditions and acting as a fuse under fault conditions. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. Technical Specifications The "FCR" series generally refers to **Flame-proof Chip Resistors**. While specific manufacturer data can vary (common manufacturers include Kamaya or KOA Speer), the general technical profile is as follows: | Parameter | Typical Value / Description | | :--- | :--- | | **Component Type** | Fused Chip Resistor (SMD) | | **Power Rating** | 0.1W to 0.25W (depending on case size) | | **Resistance Range** | Typically low-ohm (1Ω) to mid-range (100kΩ) | | **Tolerance** | ±1%, ±2%, or ±5% | | **Operating Temp** | -55°C to +155°C | | **Coating** | Flame-retardant epoxy / Silicone resin | --- ### 2. Key Electronic Features The FCR-0B-R is engineered with specific safety and performance behaviors: * **Fusing Characteristic:** If the current exceeds a specific threshold (overload), the resistor element melts or opens without generating flames or excessive heat that could damage the PCB. * **Pulse Withstanding:** These parts are designed to handle short-duration high-energy pulses better than standard film resistors. * **Anti-Sulfuration:** The "R" or "B" designations often imply a specific coating or material choice (like Gold or specialized alloys) to prevent corrosion in harsh environments. --- ### 3. Internal Construction The device is built using a layered approach to ensure reliability: 1. **Substrate:** High-purity Alumina (Ceramic) base for heat dissipation. 2. **Resistive Element:** Metal glaze or thick film layer. 3. **Protective Layer:** A specialized non-flammable glass or epoxy coating. 4. **Terminations:** Tin (Sn) over Nickel (Ni) barrier to prevent solder leaching. --- ### 4. Application Areas Because of its protective nature, the FCR-0B-R is found in circuits where safety is a priority: * **Automotive ECU:** Protecting sensors from short circuits. * **Power Supplies:** Serving as a "soft-start" or "inrush" protection component. * **Consumer Electronics:** Preventing fire hazards in battery-operated devices. --- ### 5. Identification Code Breakdown While codes vary by brand, the syntax usually follows: * **FCR:** Series Name (Flame-proof Chip Resistor). * **0B:** Size code (often corresponds to EIA 0603 or 0805 metrics). * **R:** Packaging code (Tape and Reel) or specialized tolerance/material indicator. ---