The part number **WRPPB-JM7K5R-R** refers to a high-precision **SMD (Surface Mount Device) Thin Film Chip Resistor**, typically manufactured by **Walsin Technology Corporation** (or similar precision resistor manufacturers like Susumu/RoyalOhm depending on the specific series prefix). These components are designed for high-reliability applications where stability and low noise are critical. --- ### 1. Technical Specifications Below are the typical technical parameters associated with this specific part code structure: | Parameter | Specification | | :--- | :--- | | **Resistance Value** | 7.5 kΩ (7K5) | | **Tolerance** | ±0.1% (Ultra-Precision) | | **Power Rating** | 0.1W (1/10W) to 0.125W (1/8W) | | **Package Size** | 0603 (Inch) / 1608 (Metric) | | **Technology** | Thin Film (Metal Film) | | **Temperature Coefficient (TCR)** | ±25 ppm/°C | | **Operating Temperature** | -55°C to +155°C | --- ### 2. Breakdown of the Part Number The alphanumeric string follows a standardized coding system for precision resistors: * **WR**: Series Code (Walsin Resistor / Wide Terminal or Precision Series). * **PPB**: Material/TCR Type (Often signifies Thin Film with high stability). * **JM**: Package Size code (In this context, J/M usually maps to 0603/0805 dimensions). * **7K5**: The resistance value. "7K5" = 7.5 kilo-ohms. * **R**: Packaging Type (Tape & Reel). --- ### 3. Key Electronic Characteristics #### A. Thin Film Construction Unlike standard "Thick Film" resistors (which are made by screen-printing paste), **Thin Film** resistors are created using vacuum deposition (sputtering) of a metal layer onto a ceramic substrate. * **Benefit:** Provides much lower noise and significantly better accuracy. #### B. High Precision (±0.1%) The "B" or "R" designations often indicate a tight tolerance. A 0.1% tolerance means the actual resistance will be between **7,492.5 Ω and 7,507.5 Ω**. This is essential for voltage dividers and feedback loops in Op-Amp circuits. #### C. Low Temperature Coefficient (TCR) With a TCR of ±25 ppm/°C, the resistance value changes very little as the device heats up or as the ambient temperature fluctuates. --- ### 4. Common Applications * **Medical Equipment:** Precision sensing and monitoring. * **Industrial Automation:** Control systems requiring stable reference voltages. * **Audio Equipment:** High-end DACs and amplifiers where low thermal noise is required. * **Telecommunications:** Signal processing and base station hardware. ---