Cantara/similarity-mosfet
.claude/skills/similarity-mosfet/SKILL.md
Use when working with MOSFET similarity calculations - comparing MOSFET MPNs, understanding N-channel/P-channel matching, equivalent groups like IRF530/STF530, or MOSFET-specific similarity logic.
$ install --global
skillsauthnpx skillsauth add Cantara/lib-electronic-components similarity-mosfetInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- similarity-mosfet
- description:
- Use when working with MOSFET similarity calculations - comparing MOSFET MPNs, understanding N-channel/P-channel matching, equivalent groups like IRF530/STF530, or MOSFET-specific similarity logic.
MOSFET Similarity Calculator Skill
Guidance for working with MosfetSimilarityCalculator in the lib-electronic-components library.
For metadata-driven similarity architecture, see /similarity-metadata:
- SpecImportance levels (CRITICAL, HIGH, MEDIUM, LOW, OPTIONAL)
- ToleranceRule types (exactMatch, percentageTolerance, minimumRequired, etc.)
- SimilarityProfile contexts (DESIGN_PHASE, REPLACEMENT, COST_OPTIMIZATION, etc.)
- Calculator integration patterns and gotchas
Overview
The MosfetSimilarityCalculator compares MOSFETs based on:
- Equivalent groups - Cross-manufacturer equivalents
- Channel type - N-channel vs P-channel
- Electrical characteristics - Voltage, current ratings
Applicable Types
ComponentType.MOSFET
ComponentType.MOSFET_INFINEON
ComponentType.MOSFET_ST
ComponentType.MOSFET_NXP
// Any type starting with "MOSFET_"
Note: Returns true for null type to handle unrecognized MOSFETs.
Similarity Thresholds
HIGH_SIMILARITY = 0.9; // Equivalent parts
MEDIUM_SIMILARITY = 0.7; // Similar specs
LOW_SIMILARITY = 0.3; // Different channel type or specs
Equivalent Groups
The calculator knows these cross-manufacturer equivalents:
| IRF Part | Equivalents | |----------|-------------| | IRF530 | STF530, IRF530N, STF530N | | IRF540 | STF540, IRF540N, STF540N | | IRF9530 | STF9530, IRF9530N (P-channel) | | IRF9540 | STF9540, IRF9540N (P-channel) |
Channel Type Rules
N-channel and P-channel MOSFETs always return LOW_SIMILARITY (0.3)
| Part | Channel | Note | |------|---------|------| | IRF530 | N-channel | Standard power MOSFET | | IRF9530 | P-channel | The "9" indicates P-channel | | IRF540 | N-channel | Higher current than IRF530 | | IRF9540 | P-channel | Higher current P-channel |
calculator.calculateSimilarity("IRF530", "IRF9530", registry);
// Returns 0.3 (N vs P channel)
Manufacturer Prefix Handling
The calculator normalizes manufacturer prefixes:
| Manufacturer | Prefix | Example | |--------------|--------|---------| | International Rectifier | IRF | IRF530 | | STMicroelectronics | STF | STF530 | | Vishay | IRF, SIF | SIF530 | | Infineon | IPD, IPB | IPD530 |
calculator.calculateSimilarity("IRF530", "STF530", registry);
// Returns 0.9 (same part, different manufacturer)
Suffix Handling
Common suffixes that don't affect equivalence:
N- Updated version (IRF530N ≈ IRF530)PBF- Lead-freeL- Logic level gate
calculator.calculateSimilarity("IRF530", "IRF530N", registry);
// Returns 0.9 (same MOSFET, N is just version)
Test Examples
// Cross-manufacturer equivalent
calculator.calculateSimilarity("IRF530", "STF530", registry);
// Returns 0.9
// N-channel vs P-channel
calculator.calculateSimilarity("IRF530", "IRF9530", registry);
// Returns 0.3
// Different current ratings
calculator.calculateSimilarity("IRF530", "IRF540", registry);
// Returns < 0.9 (14A vs 28A)
// Non-MOSFET parts
calculator.calculateSimilarity("LM358", "LM324", registry);
// Returns 0.0
Implementation Notes
- Returns 0.0 for non-MOSFET MPNs
- The
9in part number typically indicates P-channel - Symmetry:
sim(A,B) == sim(B,A)
Learnings & Quirks
Part Number Patterns
- IRF5xx/IRF6xx: N-channel power MOSFETs
- IRF95xx/IRF96xx: P-channel equivalents
- The xx number often indicates Vds rating (e.g., 530 ≈ 100V)
Cross-Manufacturer Equivalence
- STF = ST equivalent to IRF
- Many manufacturers make "drop-in" replacements
- Check Vds, Rds(on), and Id specs for true equivalence
Package Variants
- TO-220: Standard through-hole
- TO-220F: Isolated tab
- D-PAK: Surface mount
- Same electrical part in different package = HIGH_SIMILARITY
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