Littelfuse 044804.6MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 044804.6MR is a 4.6 A, 125 V AC/DC surface mount board mount fuse in the NANO²® 448 series. This fast-blow fuse is designed for circuit protection in applications requiring compact SMD packaging with a 2-SMD square end block configuration. The part is active in production and widely stocked, with 1480 units available in inventory. Equivalent and substitute parts are identified for applications where alternative manufacturers, packaging formats, or series variants are required while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	4.6 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	2-SMD, Square End Block
Breaking Capacity @ Rated Voltage	50 A
Operating Temperature Range	-55°C to 125°C
Size / Dimension	0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 044804.6MR are grouped into two categories based on substitution criteria:

Parametric Equivalents (Littelfuse Series Variants):

045104.6MRL (NANO²® 451 series, Cut Tape & Digi-Reel® packaging)
045304.6MR (NANO²® 453 series, Cut Tape & Digi-Reel® packaging)

These parts maintain identical electrical specifications: 4.6 A current rating, 125 V AC/DC voltage rating, fast-blow response, 50 A breaking capacity, and identical physical dimensions. Differences are limited to series designation, packaging format (Cut Tape vs. Tape & Reel), and minor variations in melting I²t and DC cold resistance within acceptable tolerances.

Direct Manufacturer Equivalents (Bourns SingleFuse™ Series):

SF-2410FP350T-2 (SingleFuse™ SF-2410FP-T series)
SF-2410HI350T-2 (SingleFuse™ SF-2410HI-T series)

These parts are manufactured by Bourns Inc. and provide electrical equivalence with identical current rating, voltage rating, response time, breaking capacity, and operating temperature range. Physical dimensions are functionally equivalent with minor tolerance variations (0.102" vs. 0.106" width and height). Both are supplied in Tape & Reel packaging.

Parameter Comparison

Parameter	044804.6MR (Littelfuse)	045104.6MRL (Littelfuse)	045304.6MR (Littelfuse)	SF-2410FP350T-2 (Bourns)	SF-2410HI350T-2 (Bourns)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Bourns Inc.
Series	NANO²® 448	NANO²® 451	NANO²® 453	SingleFuse™ SF-2410FP-T	SingleFuse™ SF-2410HI-T
Current Rating (A)	4.6	4.6	4.6	4.6	4.6
Voltage Rating AC (V)	125	125	125	125	125
Voltage Rating DC (V)	125	125	125	125	125
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Breaking Capacity @ Rated Voltage (A)	50	50	50	50	50
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Size / Dimension (mm)	6.10 x 2.69 x 2.69	6.10 x 2.69 x 2.69	6.10 x 2.69 x 2.69	6.10 x 2.59 x 2.59	6.10 x 2.59 x 2.59
DC Cold Resistance (Ohms)	0.021	0.02	0.02	0.029	0.0196
Melting I²t	2.3	2.469	2.469	2.695	24.908
Approval Agency	CSA, UL, PSE	CSA, PSE, UL	CSA, PSE, UL	cUL, UL	cUL, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)
Inventory (Pcs)	1480	9535	5450	2975	2814

Engineering Selection Recommendations

Littelfuse NANO²® Series Variants (045104.6MRL, 045304.6MR): These parts are recommended as primary substitutes for the 044804.6MR. All three Littelfuse variants maintain identical electrical performance and physical dimensions. Selection between 044804.6MR, 045104.6MRL, and 045304.6MR depends on packaging requirements and inventory availability. The 045104.6MRL offers the highest inventory level (9535 units) in Cut Tape & Digi-Reel® format, suitable for applications requiring smaller order quantities or reel formats. All three parts carry CSA, PSE, and UL approvals and are ROHS3 compliant.

Bourns SingleFuse™ Series (SF-2410FP350T-2, SF-2410HI350T-2): These parts provide electrical equivalence and are suitable for applications where Bourns components are preferred or specified. Both maintain the required 4.6 A current rating, 125 V AC/DC voltage rating, and 50 A breaking capacity. Physical dimensions are functionally equivalent with minor tolerance variations in width and height (2.59mm vs. 2.69mm). Both carry UL and cUL approvals and are ROHS3 compliant. The SF-2410HI350T-2 exhibits significantly higher melting I²t (24.908 vs. 2.3), indicating different thermal response characteristics; this difference must be evaluated against specific application requirements. The SF-2410HI350T-2 is subject to REACH regulations, whereas the 044804.6MR is REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can the 045104.6MRL and 045304.6MR be used interchangeably with the 044804.6MR?

A: Yes. All three Littelfuse parts maintain identical electrical specifications (4.6 A, 125 V AC/DC, fast-blow response, 50 A breaking capacity) and physical dimensions (6.10mm x 2.69mm x 2.69mm). Differences are limited to series designation and packaging format. Selection is based on packaging availability and inventory requirements.

Q: What are the key differences between Littelfuse and Bourns substitutes?

A: Littelfuse NANO²® variants (045104.6MRL, 045304.6MR) maintain identical physical dimensions and electrical performance. Bourns SingleFuse™ parts (SF-2410FP350T-2, SF-2410HI350T-2) provide electrical equivalence with minor physical dimension variations (2.59mm vs. 2.69mm width/height). The SF-2410HI350T-2 exhibits significantly different melting I²t characteristics and is subject to REACH regulations.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. However, the SF-2410HI350T-2 is subject to REACH regulations, whereas the 044804.6MR and other Littelfuse variants are REACH unaffected.

Q: What packaging formats are available?

A: The 044804.6MR is supplied in Tape & Reel (TR) format. Littelfuse alternatives 045104.6MRL and 045304.6MR are available in Cut Tape (CT) & Digi-Reel® format. Bourns equivalents SF-2410FP350T-2 and SF-2410HI350T-2 are supplied in Tape & Reel (TR) format.

Q: Do all substitute parts carry the same regulatory approvals?

A: Littelfuse parts carry CSA, PSE, and UL approvals. Bourns parts carry cUL and UL approvals. All parts meet the required safety standards for 125 V AC/DC circuit protection applications.

Q: What is the significance of the melting I²t difference in the SF-2410HI350T-2?

A: The SF-2410HI350T-2 exhibits a melting I²t of 24.908 compared to 2.3 for the 044804.6MR, indicating substantially different thermal response characteristics. This part exhibits slower thermal response and is classified as a different fuse type variant. Application-specific thermal and response time requirements must be evaluated before selection.

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