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

code

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

code

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

•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}.*");

•Add to getSupportedTypes():

java

types.add(ComponentType.RESISTOR);
types.add(ComponentType.RESISTOR_CHIP_MANUFACTURER);

•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