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