resistor

# Resistor Component Skill Guidance for working with resistor components in the lib-electronic-components library. ## Supported Manufacturers & Patterns | Manufacturer | Handler | MPN Patterns | Example | |--------------|---------|--------------|---------| | Vishay | `VishayHandler` | `CRCW####...`, `RCG#...`, `WSL#...` | `CRCW060310K0FKEA` | | Yageo | `YageoHandler` | `RC####...`, `RT####...`, `RL####...` | `RC0603FR-0710KL` | | Panasonic | `PanasonicHandler` | `ERJ...`, `ERJP...`, `ERJG...` | `ERJ-3EKF1001V` | | Bourns | `BournsHandler` | `CR...`, `CRM...`, `CRH...` | `CR0603-FX-1001ELF` | ## ComponentTypes ```java // Base type ComponentType.RESISTOR // Manufacturer-specific types ComponentType.RESISTOR_CHIP_VISHAY ComponentType.RESISTOR_THT_VISHAY ComponentType.RESISTOR_CHIP_YAGEO ComponentType.RESISTOR_THT_YAGEO ComponentType.RESISTOR_CHIP_PANASONIC ComponentType.RESISTOR_CHIP_BOURNS ``` ## MPN Structure ### Vishay CRCW Series ``` CRCW 0603 10K0 F K EA │ │ │ │ │ │ │ │ │ │ │ └── Packaging (EA=Tape & Reel) │ │ │ │ └──── Termination (K=Standard) │ │ │ └────── Tolerance (F=1%, J=5%) │ │ └─────────── Value (10K0 = 10kΩ) │ └──────────────── Size (0603) └───────────────────── Series ``` ### Yageo RC Series ``` RC 0603 FR -07 10K L │ │ │ │ │ │ │ │ │ │ │ └── Packaging (L=7" Reel) │ │ │ │ └────── Value (10K = 10kΩ) │ │ │ └───────── TCR Code (07=±100ppm) │ │ └───────────── Tolerance (F=1%, J=5%) │ └────────────────── Size (0603) └───────────────────── Series (RC=Thick Film) ``` ## Key Handler Methods ### Extract Package Code ```java // Returns "0603" from "CRCW060310K0FKEA" handler.extractPackageCode("CRCW060310K0FKEA"); // Returns "0805" from "RC0805JR-0710KL" handler.extractPackageCode("RC0805JR-0710KL"); ``` ### Extract Series ```java // Returns "CRCW" from Vishay handler.extractSeries("CRCW060310K0FKEA"); // Returns "RC0603" from Yageo (includes size) handler.extractSeries("RC0603FR-0710KL"); ``` ## Adding New Resistor Patterns 1. In the manufacturer handler's `initializePatterns()`: ```java registry.addPattern(ComponentType.RESISTOR, "^NEWPFX[0-9]{4}.*"); registry.addPattern(ComponentType.RESISTOR_CHIP_MANUFACTURER, "^NEWPFX[0-9]{4}.*"); ``` 2. Add to `getSupportedTypes()`: ```java types.add(ComponentType.RESISTOR); types.add(ComponentType.RESISTOR_CHIP_MANUFACTURER); ``` 3. Implement `matches()` for direct pattern matching (faster than regex fallback) ## Similarity Calculation `ResistorSimilarityCalculator` compares: - Resistance value (extracted from MPN) - Package size (0402, 0603, 0805, etc.) - Tolerance class (1%, 5%, etc.) - Power rating (if determinable) ## Common Package Sizes | Code | Metric | Size (mm) | |------|--------|-----------| | 0402 | 1005 | 1.0 x 0.5 | | 0603 | 1608 | 1.6 x 0.8 | | 0805 | 2012 | 2.0 x 1.25 | | 1206 | 3216 | 3.2 x 1.6 | | 2512 | 6332 | 6.3 x 3.2 | --- ## Learnings & Quirks <!-- Record component-specific discoveries, edge cases, and quirks here -->