The part number **04021J8R2ABSTR\500** refers to a high-precision, high-frequency Thin-Film Capacitor manufactured by **Kyocera AVX**. These components are specifically engineered for RF (Radio Frequency) and microwave applications where low loss and high stability are critical. --- ### 1. Part Number Breakdown To understand the component, we can decode the alphanumeric string based on the AVX Accu-P series datasheet: | Segment | Code | Meaning | | :--- | :--- | :--- | | **Series** | 0402 | Case Size (0.04" x 0.02" / 1.0mm x 0.5mm) | | **Voltage** | 1 | 100 Volts | | **Dielectric** | J | Silicon Dioxide / Silicon Nitride (Thin Film) | | **Capacitance** | 8R2 | 8.2 pF (Picofarads) | | **Tolerance** | A | ±0.05 pF (Ultra-Tight Tolerance) | | **Termination** | B | Nickel / Solder Coated (Sn/Pb) | | **Packaging** | STR\500 | Standard Tape & Reel (500 pieces) | --- ### 2. Key Technical Specifications The **Accu-P** series is known for its "near-ideal" capacitor characteristics. * **Capacitance:** 8.2 pF * **Tolerance:** ±0.05 pF (This is an extremely high precision rating). * **Rated Voltage:** 100V DC. * **Operating Temperature:** -55°C to +125°C. * **Q-Factor:** Extremely high (Low ESR/ESL), making it suitable for frequencies into the Gigahertz (GHz) range. --- ### 3. Applications Because of the thin-film technology used in this part, it provides much better performance at high frequencies than standard multilayer ceramic capacitors (MLCCs). Common uses include: 1. **Mobile Communications:** Base stations, cellular handsets, and satellite antennas. 2. **RF Circuitry:** Matching networks, filters, and high-frequency coupling/decoupling. 3. **Instrumentation:** Precision measurement equipment and VCOs (Voltage Controlled Oscillators). 4. **Military/Aerospace:** Telemetry and radar systems requiring high reliability. --- ### 4. Why use Thin-Film (04021J) over standard MLCCs? * **Tight Tolerances:** Thin-film processes allow for tolerances as low as ±0.01pF, which is impossible for standard ceramic manufacturing. * **Stability:** The capacitance remains extremely stable across a wide range of frequencies and temperatures. * **Low Parasitics:** Reduced Equivalent Series Resistance (ESR) means less signal loss in RF paths.