The **MEPF-11P4-R/Q** is a high-precision, automotive-grade thin film chip resistor. It belongs to a specialized class of passive components designed for stability, low noise, and reliability in harsh environments. --- ### 1. Key Technical Specifications Below is a breakdown of the typical electronic characteristics for this series: | Property | Description | | :--- | :--- | | **Component Type** | Thin Film Precision Chip Resistor | | **Case Size** | 1206 (Metric 3216) | | **Tolerance** | ±0.1% to ±0.5% (High Precision) | | **TCR** | ±10 ppm/°C to ±50 ppm/°C (Low Temperature Coefficient) | | **Power Rating** | 0.25W (1/4 Watt) | | **Operating Temp** | -55°C to +155°C | | **Certification** | AEC-Q200 Qualified (Automotive Grade) | --- ### 2. Suffix Meaning (R/Q) The suffix in these part numbers usually denotes specific performance tiers or packaging: * **P4**: Often refers to the Temperature Coefficient of Resistance (TCR) rating (e.g., 25ppm). * **R**: Generally signifies the Resistance value or "RoHS Compliant" status. * **Q**: Typically indicates **AEC-Q200** compliance, meaning the part has undergone stress testing for automotive use (vibration, thermal shock, moisture resistance). --- ### 3. Internal Construction Thin film resistors like the MEPF series are constructed differently than standard thick film resistors: 1. **Substrate:** High-purity Alumina ($Al_2O_3$) ceramic. 2. **Resistive Layer:** A thin layer of metal film (usually Nickel-Chrome) sputtered onto the substrate. This allows for a much more uniform crystalline structure. 3. **Protective Coating:** Multiple layers of epoxy or glass to prevent oxidation and sulfur moisture. 4. **Terminations:** Multi-layer end-bands (usually Silver/Nickel/Tin) for excellent solderability. --- ### 4. Typical Applications Due to its high stability and precision, the MEPF-11P4-R/Q is found in: * **Automotive ECUs:** Engine control units where heat stability is vital. * **Medical Equipment:** Monitoring devices requiring low signal noise. * **Measurement Instruments:** Scale and sensor interfaces where accuracy is paramount. * **Industrial Automation:** Feedback loops in motor controllers. --- ### 5. Sample Part Number Logic ```text MEPF - 11 - P4 - 1002 - B - R / Q | | | | | | | Series Size TCR Value Tol RoHS Auto-Grade ```