Resistor

Resistor Component Skill

Guidance for working with resistor components in the lib-electronic-components library.

Supported Manufacturers & Patterns

ComponentTypes

// 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

// Returns "0603" from "CRCW060310K0FKEA"
handler.extractPackageCode("CRCW060310K0FKEA");

// Returns "0805" from "RC0805JR-0710KL"
handler.extractPackageCode("RC0805JR-0710KL");

Extract Series

// 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():

registry.addPattern(ComponentType.RESISTOR, "^NEWPFX[0-9]{4}.*");
registry.addPattern(ComponentType.RESISTOR_CHIP_MANUFACTURER, "^NEWPFX[0-9]{4}.*");

2. Add to getSupportedTypes():

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

Learnings & Quirks