Littelfuse Manufacturer Skill

Use this skill when working with Littelfuse circuit protection components - TVS diodes, fuses, varistors, and MOVs.

Overview

Littelfuse is a leading manufacturer of circuit protection components. The handler supports:

• •TVS Diodes: Transient voltage suppressors for ESD and surge protection
• •Fuses: SMD and through-hole fuses for overcurrent protection
• •Varistors: Metal oxide varistors (MOVs) for voltage clamping

MPN Structure

TVS Diodes - SM Series (VR-Based Naming)

The SM series uses reverse standoff voltage (VR) in the part number:

SMXJ[Voltage][A/CA]

Power Ratings by Package:

Examples:

• •SMAJ5.0A - 400W, 5V standoff, unidirectional, SMA package
• •SMBJ33CA - 600W, 33V standoff, bidirectional, SMB package

TVS Diodes - P Series (VBR-Based Naming)

The P series uses breakdown voltage (VBR) in the part number:

P[Power][Package][Voltage][A/CA]

Examples:

• •P6KE6.8A - 600W, 6.8V breakdown, unidirectional, axial DO-15
• •P6KE15CA - 600W, 15V breakdown, bidirectional, axial DO-15
• •1.5KE33CA - 1500W, 33V breakdown, bidirectional, axial

Fuses - NANO2 Series

[Series][Current].[Suffix]

Suffixes:

• •.MRL - Mini Reel (1,000 pcs tape & reel)
• •.NRL - Full Reel (5,000 pcs tape & reel)

Examples:

• •0452005.MRL - Slow blow, 5A, mini reel
• •0451002.MRL - Very fast acting, 2A, mini reel
• •0448.125 - Nano2 SMF, 125mA

Varistors - V Series MOVs

Radial Lead MOVs:

V[Voltage][E/P][Size]

Multilayer SMD Varistors (MLE Series):

V[Voltage]MLE[Package][Options]

Examples:

• •V07E130P - 130V, 7mm disc, epoxy/phenolic
• •V18MLE0603N - 18V, multilayer, 0603 package
• •V26MLE0805N - 26V, multilayer, 0805 package

Supported ComponentTypes

• •DIODE - Base type for all TVS diodes
• •TVS_DIODE_LITTELFUSE - Specific TVS diode type
• •FUSE_LITTELFUSE - Fuse type
• •VARISTOR_LITTELFUSE - Varistor type

Handler Methods

Core Methods

// Pattern matching
boolean matches(String mpn, ComponentType type, PatternRegistry patterns)

// Extraction methods
String extractPackageCode(String mpn)  // Returns package (SMA, SMB, NANO2, etc.)
String extractSeries(String mpn)       // Returns series (SMAJ, P6KE, 0452, etc.)

Littelfuse-Specific Methods

// TVS Diode specific
String extractVoltage(String mpn)      // Returns voltage rating
boolean isBidirectional(String mpn)    // True for CA suffix parts
int getPowerRating(String mpn)         // Returns power in watts

// Fuse specific
String extractCurrentRating(String mpn) // Returns current rating

Usage Examples

LittelfuseHandler handler = new LittelfuseHandler();
PatternRegistry registry = new PatternRegistry();
handler.initializePatterns(registry);

// TVS Diode detection
handler.matches("SMAJ15A", ComponentType.TVS_DIODE_LITTELFUSE, registry); // true
handler.extractPackageCode("SMAJ15A");  // "SMA"
handler.extractVoltage("SMAJ15A");      // "15"
handler.isBidirectional("SMAJ15CA");    // true
handler.getPowerRating("SMAJ15A");      // 400

// Fuse detection
handler.matches("0452005.MRL", ComponentType.FUSE_LITTELFUSE, registry); // true
handler.extractPackageCode("0452005.MRL");  // "NANO2"
handler.extractCurrentRating("0452005.MRL"); // "5"

// Varistor detection
handler.matches("V18MLE0603N", ComponentType.VARISTOR_LITTELFUSE, registry); // true
handler.extractPackageCode("V18MLE0603N");  // "0603"
handler.extractVoltage("V18MLE0603N");      // "18"

Common Selection Guide

TVS Diode Selection by Application

Fuse Selection by Characteristics

Learnings & Quirks

VR vs VBR Naming Systems

• •VR-based (SMAJ, SMBJ, etc.): Part number shows standoff voltage
• •VBR-based (P4KE, P6KE, etc.): Part number shows breakdown voltage
• •Important: SMAJ10A and P4SMA10A have DIFFERENT voltage characteristics!
  • •SMAJ10A has 10V standoff (VR), breakdown is higher
  • •P4SMA10A has 10V breakdown (VBR), standoff is lower (~8.5V)

Bidirectional vs Unidirectional

• •A suffix = Unidirectional (cathode band marking)
• •CA suffix = Bidirectional (no polarity)
• •Gotcha: CA parts have ~2x the capacitance of A parts

Fuse Current Ratings

• •Current in 045x series is in the middle: 0452005 = 5A
• •Leading zeros are significant for sub-1A ratings: 0452.250 = 250mA

Package Cross-Reference

Related Skills

• •/semiconductor - General semiconductor handling
• •/similarity-diode - TVS diode similarity calculations
• •/component - Base component operations

Test Examples

// Test file: LittelfuseHandlerTest.java
// Location: src/test/java/no/cantara/electronic/component/lib/handlers/

@Test
void shouldDetectSMAJVariants() {
    assertTrue(handler.matches("SMAJ15A", ComponentType.TVS_DIODE_LITTELFUSE, registry));
    assertTrue(handler.matches("SMAJ33CA", ComponentType.TVS_DIODE_LITTELFUSE, registry));
}

@Test
void shouldExtractTVSInfo() {
    assertEquals("SMA", handler.extractPackageCode("SMAJ15A"));
    assertEquals("15", handler.extractVoltage("SMAJ15A"));
    assertEquals(400, handler.getPowerRating("SMAJ15A"));
}