The part number **04021J8R2ABSTR** refers to a high-precision, high-frequency Thin-Film Capacitor manufactured by **AVX (Kyocera AVX)**. This component is specifically designed for RF (Radio Frequency) and microwave applications where low loss and tight tolerances are critical. --- ### 1. Part Number Breakdown The alphanumeric string follows the standard AVX naming convention for the "Accu-P" series: | Code | Segment | Meaning | | :--- | :--- | :--- | | **0402** | Case Size | 0.04 x 0.02 inches (1.0 x 0.5 mm) | | **1** | Voltage | 100 Volts | | **J** | Dielectric | Accu-P (Silicon Dioxide/Oxynitride) | | **8R2** | Capacitance | 8.2 pF (R acts as decimal point) | | **A** | Tolerance | ±0.05 pF (Ultra-tight tolerance) | | **B** | Failure Rate | Standard | | **S** | Termination | Nickel/Solder Coated (Sn63/Pb37) | | **TR** | Packaging | Tape & Reel | --- ### 2. Technical Specifications These parts are distinct from standard multilayer ceramic capacitors (MLCCs) because they use thin-film technology similar to semiconductor manufacturing. * **Capacitance:** 8.2 pF * **Voltage Rating:** 100V DC * **Operating Temperature:** -55°C to +125°C * **Q-Factor:** Extremely high (Low ESR/ESL at GHz frequencies) * **Stability:** High stability under varying voltage and temperature conditions. --- ### 3. Key Applications Because of the **±0.05 pF tolerance**, this part is used in circuits where even a tiny deviation in capacitance would cause the circuit to fail or lose signal integrity. * **RF Power Amplifiers:** Used for matching networks. * **Filters:** High-precision low-pass, high-pass, and band-pass filters. * **VCOs:** Voltage Controlled Oscillators requiring stable frequency tuning. * **Telecommunications:** Base stations (5G/4G), satellite communications, and GPS modules. --- ### 4. Why "Thin-Film" instead of "MLCC"? Standard MLCCs (like X7R or NP0) have higher variations in their physical structure. **Thin-film** capacitors (Accu-P) provide: 1. **Lower ESR:** Lower energy loss at high frequencies. 2. **Higher Precision:** Tighter tolerances (down to ±0.01pF) than standard ceramics. 3. **Predictability:** Better modeling for RF simulation software (like ADS or HFSS).