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Use when working with capacitor similarity calculations - comparing ceramic/electrolytic/film capacitor MPNs, understanding value/voltage/dielectric matching, or capacitor-specific similarity logic.
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SOC 職業分類に基づく
Use when refactoring, cleaning up, or enhancing the lib-electronic-components codebase. Provides guidance on architecture patterns, known issues, duplication hotspots, and recommended improvements.
Base skill for working with electronic components in this library. Use when adding new component types, manufacturer handlers, or working with MPN (Manufacturer Part Number) operations, BOM entries, or component classification.
Use this skill BEFORE creating a PR to ensure all documentation, skills, and learnings are updated. Critical for preserving institutional knowledge and preventing documentation drift.
Use when working with component similarity calculations - comparing MPNs, finding equivalent parts, implementing new similarity calculators, or understanding how component matching works.
Use when working with connector similarity calculations - comparing connector MPNs, understanding pin count/pitch/family matching, or connector-specific similarity logic.
Use when working with diode similarity calculations - comparing signal/rectifier/zener/Schottky diode MPNs, understanding equivalent groups like 1N4148/1N914, or diode-specific similarity logic.
| name | similarity-capacitor |
| description | Use when working with capacitor similarity calculations - comparing ceramic/electrolytic/film capacitor MPNs, understanding value/voltage/dielectric matching, or capacitor-specific similarity logic. |
Guidance for working with CapacitorSimilarityCalculator in the lib-electronic-components library.
For metadata-driven similarity architecture, see /similarity-metadata:
The CapacitorSimilarityCalculator compares capacitors based on:
ComponentType.CAPACITOR
ComponentType.CAPACITOR_CERAMIC_MURATA
ComponentType.CAPACITOR_CERAMIC_TDK
ComponentType.CAPACITOR_CERAMIC_SAMSUNG
ComponentType.CAPACITOR_CERAMIC_YAGEO
ComponentType.CAPACITOR_ELECTROLYTIC_NICHICON
// Any type starting with "CAPACITOR_"
Returns false for null type.
| Condition | Score |
|---|---|
| Same value, same package, same voltage | ~0.8+ |
| Same value, different package | ~0.5-0.7 |
| Same package, different value | ~0.3 |
| Different everything | ~0.0-0.3 |
| MPN Pattern | Value |
|---|---|
104 in MPN | 100nF (10×10⁴ pF) |
103 in MPN | 10nF (10×10³ pF) |
100N | 100nF |
10U | 10µF |
GRM 188 R 71 H 104 K A01 D
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ └── Packaging
│ │ │ │ │ │ │ └────── Termination
│ │ │ │ │ │ └──────── Tolerance (K=10%)
│ │ │ │ │ └──────────── Value (104=100nF)
│ │ │ │ └────────────── Voltage (H=50V)
│ │ │ └───────────────── Dielectric (71=X7R)
│ │ └──────────────────── Thickness
│ └──────────────────────── Size (188=0603)
└──────────────────────────── Series
CL 10 B 104 K B8 NNNC
│ │ │ │ │ │ │
│ │ │ │ │ │ └── Packaging
│ │ │ │ │ └───── Voltage (B8=25V)
│ │ │ │ └─────── Tolerance (K=10%)
│ │ │ └─────────── Value (104=100nF)
│ │ └────────────── Dielectric (B=X7R)
│ └───────────────── Size (10=0603)
└──────────────────── Series
CC 0603 KRX 7R 9 BB 104
│ │ │ │ │ │ │
│ │ │ │ │ │ └── Value (104=100nF)
│ │ │ │ │ └───── Voltage (BB=50V)
│ │ │ │ └─────── TCC code
│ │ │ └────────── Dielectric (7R=X7R)
│ │ └────────────── Tolerance (K=10%)
│ └─────────────────── Size (0603)
└────────────────────── Series
// Murata vs Samsung same value/size
calculator.calculateSimilarity("GRM188R71H104KA01D", "CL10B104KB8NNNC", registry);
// Returns >= 0.5 (both 100nF, 0603)
| Type | Characteristics | Temp Range |
|---|---|---|
| C0G/NP0 | Stable, low loss | -55 to +125°C |
| X5R | Higher capacity | -55 to +85°C |
| X7R | General purpose | -55 to +125°C |
| Y5V | High capacity, variable | -30 to +85°C |
// Same Murata capacitor
calculator.calculateSimilarity("GRM188R71H104KA01D", "GRM188R71H104KA01D", registry);
// Returns ~0.8
// Same value, different package
calculator.calculateSimilarity("GRM188R71H104KA01D", "GRM21BR71H104KA01D", registry);
// Returns ~0.5-0.7
// Different values
calculator.calculateSimilarity("GRM188R71H104KA01D", "GRM188R71H103KA01D", registry);
// Returns ~0.3 (100nF vs 10nF)
// Cross-manufacturer
calculator.calculateSimilarity("GRM188R71H104KA01D", "CL10B104KB8NNNC", registry);
// Returns >= 0.5
104 = 10×10⁴ pF = 100nF473 = 47×10³ pF = 47nF| Imperial | Metric | Murata Code |
|---|---|---|
| 0402 | 1005 | 155 |
| 0603 | 1608 | 188 |
| 0805 | 2012 | 21 |
| 1206 | 3216 | 31 |
Critical Bug: The micro sign µ (U+00B5) becomes Greek capital MU Μ (U+039C) when uppercased:
"0.1µF".toUpperCase() // Returns "0.1ΜF" NOT "0.1µF"!
Impact: If parseCapacitanceValue() uses toUpperCase() before checking for "µF", the check fails silently, returning null. This causes capacitance comparison to be skipped, reducing similarity from ~1.0 to ~0.33 (package match only).
Solution: Replace µ→u and Μ→u before normalizing:
String normalized = value.replace("µ", "u").replace("Μ", "u");
normalized = normalizeValue(normalized); // Now safe to toUpperCase
if (normalized.contains("UF")) { // Matches both µF and plain UF
Lesson: Always handle Greek-origin SI prefixes (µ, Ω) carefully in string normalization logic.