The **FCR-B2-R** refers to a high-precision, thin-film chip resistor array (often associated with manufacturers like Susumu or similar precision component providers). These parts are designed for applications requiring high stability, tight tolerances, and space-saving layouts. --- ### 1. Key Technical Specifications The "FCR" series generally follows a specific architecture designed for surface mount technology (SMT). | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | Thin-film Chip Resistor Array | | **Resistance Tolerance** | ±0.1% to ±0.5% | | **Temperature Coefficient (TCR)** | ±25ppm/°C to ±100ppm/°C | | **Power Rating** | 0.063W to 0.1W per element | | **Operating Temperature** | -55°C to +125°C | | **Number of Resistors** | Usually 2 or 4 resistors per package | --- ### 2. Internal Electronic Structure The "B2" designation typically refers to the physical configuration and the number of resistive elements integrated into the single ceramic substrate. * **Thin-Film Technology:** Unlike thick-film resistors, thin-film (sputtered metal) provides much lower noise and higher precision. * **Ratio Matching:** Because the resistors are etched onto the same substrate, they track each other thermally. If one resistor heats up, the others do as well, maintaining a consistent resistance **ratio**. * **Termination:** Usually features "Convex" or "Concave" terminations (leads) for soldering onto a PCB. --- ### 3. Benefits of using FCR-B2-R Using a resistor array instead of discrete individual resistors offers several engineering advantages: 1. **High Density:** Reduces the number of pick-and-place operations during manufacturing and saves PCB real estate. 2. **Excellent Matching:** Ideal for voltage dividers or operational amplifier gain circuits where the relationship between two resistors is more important than their absolute values. 3. **Reliability:** Reduced solder joints compared to multiple discrete parts can improve the Mean Time Between Failures (MTBF). --- ### 4. Common Applications These parts are found in precision electronics where drift must be minimized: * **Instrumentation:** Signal conditioning and data acquisition systems. * **Medical Equipment:** High-stability monitoring devices. * **Automotive:** Engine control units (ECU) and sensor interfaces. * **Telecommunications:** Network base stations and switching equipment.