Lib-electronic-components resistor

Use when working with resistor components - adding resistor patterns, parsing resistor MPNs, extracting resistance values, tolerance, or package codes from resistor part numbers.

install

source · Clone the upstream repo

git clone https://github.com/Cantara/lib-electronic-components

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/Cantara/lib-electronic-components "$T" && mkdir -p ~/.claude/skills && cp -r "$T/.claude/skills/resistor" ~/.claude/skills/cantara-lib-electronic-components-resistor && rm -rf "$T"

manifest: .claude/skills/resistor/SKILL.md

source content

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

// 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

In the manufacturer handler's
```
initializePatterns()
```
:

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

Add to
```
getSupportedTypes()
```
:

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