majiayu000 Diode Similarity Calculator Skill
Guidance for working with DiodeSimilarityCalculator 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 DiodeSimilarityCalculator compares diodes based on:
- Diode type - Signal, rectifier, zener, Schottky
- Equivalent groups - Known interchangeable parts
- Voltage ratings - For rectifier and zener diodes
Applicable Types
ComponentType.DIODE
// Any type starting with "DIODE_"
Returns false for null type.
Similarity Thresholds
HIGH_SIMILARITY = 0.9; // Equivalent parts
MEDIUM_SIMILARITY = 0.7; // Same family, compatible
LOW_SIMILARITY = 0.3; // Same type, different specs
Signal Diode Equivalents
| Group | Members | Notes |
|---|---|---|
| 1N4148/1N914 | 1N4148, 1N914 | Classic signal diodes, equivalent |
calculator.calculateSimilarity("1N4148", "1N914", registry);
// Returns 0.9 (equivalent signal diodes)
Rectifier Diode Equivalents
1N400x Series (1A Rectifiers)
| Part | Voltage | Equivalent |
|---|---|---|
| 1N4001 | 50V | RL201 |
| 1N4002 | 100V | RL202 |
| 1N4003 | 200V | RL203 |
| 1N4004 | 400V | RL204 |
| 1N4005 | 600V | RL205 |
| 1N4006 | 800V | RL206 |
| 1N4007 | 1000V | RL207 |
// Same voltage equivalents
calculator.calculateSimilarity("1N4007", "RL207", registry);
// Returns 0.9 (both 1000V rectifiers)
// Same family, different voltage
calculator.calculateSimilarity("1N4001", "1N4007", registry);
// Returns 0.9 (same family, all rectifiers)
calculator.calculateSimilarity("1N4001", "1N4004", registry);
// Returns >= 0.7 (same family)
Zener Diode Rules
Zener diodes are compared by voltage rating:
| Part | Voltage |
|---|---|
| 1N4728 | 3.3V |
| 1N4733 | 5.1V |
| 1N4742 | 12V |
| 1N4744 | 15V |
// Same voltage zener
calculator.calculateSimilarity("1N4733", "1N4733", registry);
// Returns 0.9
// Different voltage zeners
calculator.calculateSimilarity("1N4733", "1N4742", registry);
// Returns 0.3 (5.1V vs 12V - not interchangeable)
Schottky Diode Equivalents
| Group | Members |
|---|---|
| BAT54 | BAT54, BAT54S (series dual) |
calculator.calculateSimilarity("BAT54", "BAT54S", registry);
// Returns 0.9 (same Schottky, different configuration)
Test Examples
// Equivalent signal diodes
calculator.calculateSimilarity("1N4148", "1N914", registry);
// Returns 0.9
// Same rectifier diode
calculator.calculateSimilarity("1N4007", "1N4007", registry);
// Returns 0.9
// Cross-manufacturer rectifier
calculator.calculateSimilarity("1N4007", "RL207", registry);
// Returns 0.9
// Same zener voltage
calculator.calculateSimilarity("1N4733", "1N4733", registry);
// Returns 0.9
// Different zener voltage
calculator.calculateSimilarity("1N4733", "1N4742", registry);
// Returns 0.3
// Non-diode parts
calculator.calculateSimilarity("LM358", "LM324", registry);
// Returns 0.0
Learnings & Quirks
1N400x Series Pattern
- 1N = JEDEC prefix
- 400x = 1A rectifier series
- x = voltage code (1=50V through 7=1000V)
Zener Voltage Codes
- 1N47xx series: xx roughly indicates voltage
- Need lookup table for exact voltage
Schottky Configurations
- BAT54 = Single diode
- BAT54S = Series dual (2 diodes in series)
- BAT54A = Common anode
- BAT54C = Common cathode
- These are same diode, different configurations
Signal vs Rectifier
- Signal diodes (1N4148): Fast switching, low current
- Rectifier diodes (1N4007): Higher current, slower