Littelfuse 044801.6MR Surface Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 044801.6MR is a 1.6 A, 125 V AC/DC surface mount board fuse in the NANO²® 448 series. This fast-blow fuse is designed for circuit protection in compact electronic applications requiring SMD mounting. The part is currently active in production with full inventory availability. Equivalent substitute parts are identified within the NANO²® fuse family to support design flexibility, supply chain continuity, and component sourcing optimization.

Substiute Parts

044801.6MR

Littelfuse Inc.In Stock: 1519044801.6MR Datasheet

Current PartRFQ

045101.6MRL

Littelfuse Inc.In Stock: 65262045101.6MRL Datasheet

Parametric EquivalentRFQ

045301.6MR

Littelfuse Inc.In Stock: 1539045301.6MR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 044801.6MR are qualified based on strict electrical and mechanical parameter matching within the NANO²® fuse product family. The following parameters define substitution eligibility:

• Current Rating: 1.6 A (exact match required)
• Voltage Rating: 125 V AC / 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (exact match required)
• Breaking Capacity: 50 A @ Rated Voltage (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Regulatory Compliance: CSA, UL, PSE certifications (all required)

The identified substitute parts (045101.6MRL and 045301.6MR) meet all electrical and mechanical requirements for direct substitution. Differences in melting I²t values and DC cold resistance fall within acceptable engineering tolerances for this fuse category and do not affect functional interchangeability in circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts (044801.6MR, 045101.6MRL, and 045301.6MR) are active production components with full regulatory compliance. Selection among these equivalents is based on inventory availability and supply chain requirements rather than functional performance differences.

The 044801.6MR (NANO²® 448 series) and 045301.6MR (NANO²® 453 series) maintain comparable inventory levels at 1439 and 1488 units respectively. The 045101.6MRL (NANO²® 451 series) offers significantly higher inventory availability at 65,200 units, making it the preferred choice for high-volume production or extended supply assurance.

All parts carry identical electrical ratings, mechanical dimensions, and regulatory certifications (CSA, UL, PSE). The minor variations in melting I²t (1.122 versus 1.06) and DC cold resistance (0.06261 versus 0.058 Ohms) are within acceptable engineering tolerances for surface mount fuse applications and do not impact circuit protection performance or compatibility.

Frequently Asked Questions (FAQ)

Q: Can 045101.6MRL and 045301.6MR be used interchangeably with 044801.6MR?

A: Yes. All three parts meet identical electrical specifications (1.6 A, 125 V AC/DC, fast-blow response), mechanical dimensions (0.240" x 0.106" x 0.106"), and regulatory requirements. They are functionally equivalent for direct PCB substitution.

Q: What is the difference between the NANO²® 448, 451, and 453 series designations?

A: The series numbers identify different product generations within the NANO²® fuse family. All three series share identical electrical and mechanical parameters for the 1.6 A, 125 V rating. The series designation reflects internal design evolution and manufacturing process updates.

Q: Are there any compatibility issues with PCB footprints or reflow soldering?

A: No. All substitute parts use the identical 2-SMD, Square End Block package with matching physical dimensions. PCB footprints, solder pad layouts, and reflow soldering profiles are fully compatible across all three parts.

Q: Why do the melting I²t values differ between parts?

A: Melting I²t variations (1.122 for 044801.6MR versus 1.06 for 045101.6MRL and 045301.6MR) reflect minor differences in internal fuse element design across product generations. Both values remain within the fast-blow response classification and do not affect circuit protection performance for standard 1.6 A applications.

Q: Which part should be selected for new designs?

A: Selection should prioritize supply chain availability and lead time requirements. The 045101.6MRL offers the highest inventory level (65,200 units), making it the optimal choice for production continuity. All three parts are functionally equivalent and carry active product status with full regulatory compliance.

Q: Are all parts RoHS3 compliant and REACH unaffected?

A: Yes. All three substitute parts carry ROHS3 Compliant status and REACH Unaffected designation. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special storage or handling requirements.