Littelfuse 0452002.MR NANO²® 452 Surface Mount Fuse – Equivalent & Substitute Parts

Part Overview

The Littelfuse 0452002.MR is a 2 A, 125 V AC/DC surface mount board fuse in the NANO²® 452 series, featuring a 2-SMD square end block package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The electrical and mechanical specifications remain consistent across the substitute part family, enabling direct functional replacement based on packaging and compliance requirements.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow 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 × 0.106" W × 0.106" H (6.10 mm × 2.69 mm × 2.69 mm)
DC Cold Resistance	0.0625 Ohms
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Current Rating: Must be 2 A
Voltage Rating: Must be 125 V AC and 125 V DC
Response Time: Must be Slow Blow
Mounting Type: Must be Surface Mount
Package / Case: Must be 2-SMD, Square End Block
Physical Dimensions: Must be 0.240" L × 0.106" W × 0.106" H (6.10 mm × 2.69 mm × 2.69 mm)
Breaking Capacity: Must be 50 A @ Rated Voltage
Operating Temperature: Must support -55°C to 125°C range

All substitute parts listed below meet these core electrical and mechanical requirements. Differences in packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®), RoHS compliance status, and regulatory approvals do not affect functional interchangeability in the circuit.

Parameter Comparison

Part Number	Series	Current Rating	Voltage (AC/DC)	Response Time	Melting I²t	DC Cold Resistance	Breaking Capacity	Product Status	Packaging	RoHS Status
0452002.MR	NANO²® 452	2 A	125 V / 125 V	Slow Blow	8.2	0.0625 Ω	50 A	Obsolete	Bulk	Non-compliant
0449002.MR	NANO²® 449	2 A	125 V / 125 V	Slow Blow	6.76	0.0708 Ω	50 A	Active	Tape & Reel (TR)	ROHS3 Compliant
0452002.MRL	NANO²® 452	2 A	125 V / 125 V	Slow Blow	8.2	0.0625 Ω	50 A	Active	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
0452002.MRSN	NANO²® 452	2 A	125 V / 125 V	Slow Blow	8.2	0.0625 Ω	50 A	Active	Tape & Reel (TR)	ROHS3 Compliant
0452002.NRL	NANO²® 452	2 A	125 V / 125 V	Slow Blow	8.2	0.0625 Ω	50 A	Active	Tape & Reel (TR)	ROHS3 Compliant
0454002.MR	NANO²® 454	2 A	125 V / 125 V	Slow Blow	8.2	0.0625 Ω	50 A	Active	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
0454002.NR	NANO²® 454	2 A	125 V / 125 V	Slow Blow	8.2	0.0625 Ω	50 A	Active	Tape & Reel (TR)	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

0452002.MRL is the preferred substitute for the obsolete 0452002.MR. Both parts belong to the NANO²® 452 series and share identical electrical characteristics (Melting I²t of 8.2, DC Cold Resistance of 0.0625 Ω). The 0452002.MRL is active in production, ROHS3 compliant, and available in Cut Tape & Digi-Reel® packaging with high inventory (141,490 pcs).

Alternative Options:

0452002.MRSN and 0452002.NRL: Both are active NANO²® 452 series parts with identical electrical specifications. Available in Tape & Reel packaging. 0452002.MRSN carries REACH Affected status; 0452002.NRL is REACH Unaffected.
0454002.MR and 0454002.NR: Active NANO²® 454 series parts with identical electrical and mechanical specifications. Suitable for applications where series designation is not a design constraint. Both are ROHS3 compliant.
0449002.MR: Active NANO²® 449 series part with slightly different thermal characteristics (Melting I²t of 6.76 vs. 8.2). DC Cold Resistance is 0.0708 Ω compared to 0.0625 Ω. Suitable only if thermal response differences are acceptable for the application.

All substitute parts maintain the same 2 A current rating, 125 V AC/DC voltage rating, 50 A breaking capacity, and physical dimensions required for board-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use 0449002.MR as a direct replacement for 0452002.MR?

A: 0449002.MR is electrically and mechanically compatible but exhibits different thermal characteristics. The Melting I²t value is 6.76 compared to 8.2 for the original part, and DC Cold Resistance is 0.0708 Ω versus 0.0625 Ω. Use this part only if your circuit design accommodates these thermal differences.

Q: What is the difference between the packaging options (Tape & Reel vs. Cut Tape & Digi-Reel®)?

A: Packaging format affects procurement and assembly processes only. Tape & Reel (TR) is standard reel packaging for automated pick-and-place equipment. Cut Tape (CT) & Digi-Reel® provides flexibility for smaller quantities or mixed component orders. Electrical and mechanical performance are identical.

Q: Is the 0454002 series interchangeable with the 0452002 series?

A: Yes. Both 0454002.MR and 0454002.NR meet all electrical and mechanical substitution criteria. The series designation reflects manufacturing lineage but does not affect functional performance in the circuit.

Q: Why is 0452002.MR marked as obsolete?

A: The original part is no longer in production. Active equivalents in the same series (0452002.MRL, 0452002.MRSN, 0452002.NRL) provide continued design support with improved compliance status (ROHS3 compliant).

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The original 0452002.MR is RoHS non-compliant. If RoHS compliance is a design requirement, select from the active substitute parts.

Q: What is the inventory status for each substitute part?

A: 0452002.MRL has the highest inventory (141,490 pcs), followed by 0454002.MR (13,200 pcs) and 0452002.NRL (12,715 pcs). Lower inventory parts include 0452002.MRSN (1,851 pcs), 0449002.MR (1,900 pcs), and 0454002.NR (707 pcs).

Q: Do all substitute parts support the same operating temperature range?

A: Yes. All substitute parts operate across -55°C to 125°C, matching the original part specification.

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