The part number **04025K8R2ABSTR** refers to a high-precision Thin-Film Surface Mount Capacitor, typically manufactured by **AVX (Kyocera AVX)**. This specific component is part of the **Accu-P®** series, which is designed for high-frequency (RF and Microwave) applications. --- ### 1. Part Number Breakdown The alphanumeric string provides specific details about the component's physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **0402** | Case Size | 0402 (Standard Imperial: 0.04" x 0.02" / 1.0mm x 0.5mm) | | **5** | Voltage Rating | 50 Volts DC | | **K** | Temperature Coeff. | Thin Film (specifically tuned for RF stability) | | **8R2** | Capacitance Value | 8.2 pF (Picofarads) | | **A** | Tolerance | ±0.05 pF (Ultra-tight tolerance) | | **B** | Termination | Nickel/Solder Coated (Standard Sn/Pb or Lead-Free Sn) | | **STR** | Packaging | Tape and Reel (Large quantities for pick-and-place) | --- ### 2. Technical Specifications This component is engineered for performance in the Gigahertz (GHz) range where standard MLCCs (Multi-Layer Ceramic Capacitors) often fail due to parasitic inductance. * **Capacitance:** 8.2 pF * **Tolerance:** ±0.05 pF (This is an extremely precise value, necessary for tuning circuits). * **Voltage:** 50V * **Operating Temperature:** -55°C to +125°C * **Quality Factor (Q):** High Q (Low loss) at high frequencies. * **SRF (Self-Resonant Frequency):** Very high, typically in the multi-GHz range. --- ### 3. Key Features and Applications The **Accu-P** series uses thin-film technology (similar to semiconductor manufacturing) rather than the "pressed powder" method used in standard capacitors. This results in superior copper trace precision. #### Common Uses: * **RF Matching Networks:** Ensuring impedance matching between antennas and power amplifiers. * **VCOs:** Voltage Controlled Oscillators where frequency stability is critical. * **Filters:** High-pass, low-pass, and band-pass filters in telecommunications. * **Mobile Devices:** Used in 4G/5G circuitry due to the small 0402 footprint. --- ### 4. Why use this over a standard capacitor? Standard ceramic capacitors (MLCCs) have high "ESR" (Equivalent Series Resistance) and "ESL" (Equivalent Series Inductance) at high frequencies. The **04025K8R2ABSTR** is designed to have: 1. **Low ESR:** Minimizes signal loss and heat generation. 2. **High Stability:** The capacitance value remains constant even as temperature and frequency change. 3. **Predictable Performance:** Precise modeling for RF simulation software like ADS or HFSS.