The **FCR-35W-R** is a specific electronic component, typically categorized as a **High-Power Thick Film Chip Resistor**. These components are designed to handle significant power loads while maintaining a small surface-mount footprint. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Technical Specifications The part number "FCR-35W-R" generally follows a standardized coding system used by manufacturers like **Kamaya** or **Rohm**. | Parameter | Specification | | :--- | :--- | | **Component Type** | Thick Film Chip Resistor | | **Power Rating** | 35 Watts (Requires proper heat sinking) | | **Resistance Range** | Usually 0.1 $\Omega$ to 1 M$\Omega$ (depending on sub-series) | | **Tolerance** | Typically ±1% or ±5% | | **Package Style** | TO-220 or TO-247 (Power package) | | **Operating Temperature** | -55°C to +155°C | --- ### 2. Key Electronic Features * **High Power Density:** Unlike standard SMD resistors (like 0805 or 1206) which handle fractions of a watt, the FCR-35 series is designed for power-heavy applications, offering up to **35 Watts** of dissipation. * **Non-Inductive Design:** Because it uses thick film technology rather than wire-wound coils, it has very low inductance. This makes it ideal for high-frequency switching applications. * **Thermal Management:** The "R" in the suffix often denotes the packaging style or RoHS compliance. These parts usually feature a metal backplate to be bolted directly to a heatsink. --- ### 3. Circuit Applications Because of its high power rating and precision, the FCR-35W-R is commonly found in the following circuits: 1. **Snubber Circuits:** Used to suppress voltage spikes in switching power supplies. 2. **Current Sensing:** Acting as a shunt resistor to monitor high-current paths. 3. **Dummy Loads:** Used in testing power amplifiers or battery discharge circuits. 4. **Motor Control:** Providing braking resistance or current limiting for industrial motors. --- ### 4. Installation Requirements To achieve the rated **35W** performance, the following electronic conditions must be met: * **Thermal Paste:** A thermal interface material (TIM) must be applied between the resistor and the heatsink. * **Derating Curve:** If the ambient temperature exceeds 25°C, the allowable power dissipation decreases. Engineers must refer to the "Derating Curve" in the datasheet to avoid component failure. ---