Littelfuse 044104.6WR Surface Mount Fuse 4.6A 32VDC 0603 Equivalent & Substitute Parts

Part Overview

The Littelfuse 044104.6WR is an active surface mount board fuse rated for 4.6A at 32VDC with fast blow response characteristics. Housed in a 0603 (1608 Metric) package, this component is designed for circuit protection in compact electronic assemblies. The part maintains active product status with 3400 units in current inventory. Substitute parts may be required due to supply chain constraints, regional certification requirements, or specific application voltage specifications while maintaining equivalent electrical protection performance.

Substiute Parts

044103.5WR

Littelfuse Inc.In Stock: 3464044103.5WR Datasheet

Current PartRFQ

043803.5WRGT

Littelfuse Inc.In Stock: 2189043803.5WRGT Datasheet

Parametric EquivalentRFQ

044103.5WRA

Littelfuse Inc.In Stock: 6315044103.5WRA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 044104.6WR is determined by the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 4.6 A (exact match required)
• DC Voltage Rating: 32 V (exact match required)
• Package / Case: 0603 (1608 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)

Secondary Compatibility Parameters:

• Breaking Capacity @ Rated Voltage: 50A minimum
• Operating Temperature Range: -55°C ~ 150°C (minimum)
• RoHS Compliance: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The identified substitute parts meet all primary criteria and maintain compatibility across secondary parameters. Variations in AC voltage ratings, melting I²t values, and regional certifications do not affect DC circuit protection equivalency when primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

044104.6WR (Primary Part) Recommended for applications requiring DC-only circuit protection at 32V with 4.6A rating. Holds CSA and UL approvals. Suitable for standard industrial and consumer electronics applications.

043804.6WRGT (Substitute - Dual Voltage Capability) Provides equivalent DC protection with additional 12VAC rating capability. Holds CSA and cURus certifications. The higher DC cold resistance (0.021 Ohms vs. 0.0117 Ohms) and lower melting I²t (0.647 vs. 0.9438) indicate slightly faster thermal response. Recommended when AC voltage protection is required or when cURus certification is mandated by regional standards.

044104.6WRA (Substitute - Certification Variant) Maintains identical electrical specifications to the primary part with CE and cURus certifications. Identical DC cold resistance and melting I²t values ensure equivalent thermal performance. Recommended for applications requiring CE marking or cURus compliance in place of UL/CSA certifications. Highest inventory availability (6300 units) supports supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can 043804.6WRGT be used as a direct replacement for 044104.6WR in DC-only circuits? A: Yes. The 043804.6WRGT meets all primary substitution criteria for DC circuit protection: identical 4.6A current rating, 32V DC voltage rating, 0603 package, surface mount configuration, and fast blow response. The additional 12VAC rating does not affect DC performance.

Q: What is the significance of the different DC cold resistance values between parts? A: DC cold resistance affects thermal response characteristics. The 044104.6WR and 044104.6WRA both measure 0.0117 Ohms, while the 043804.6WRGT measures 0.021 Ohms. This difference reflects design variations in the fuse element but does not prevent substitution when current and voltage ratings match.

Q: Are all three parts suitable for the same PCB assembly process? A: Yes. All three parts share identical package specifications (0603 / 1608 Metric), surface mount configuration, and moisture sensitivity level (MSL 1 - Unlimited). They are compatible with standard reflow soldering processes without additional handling requirements.

Q: Which substitute part should be selected for maximum supply availability? A: The 044104.6WRA offers the highest current inventory at 6300 units, compared to 3400 units for the primary part and 2100 units for the 043804.6WRGT.

Q: Do certification differences affect interchangeability? A: Certification differences reflect regional approval standards but do not affect electrical interchangeability. Select based on application certification requirements: UL/CSA for North American markets, CE for European markets, or cURus for dual-region compliance.