Equivalent & Substitute Parts for 0453012.MR

Part Overview

The 0453012.MR is a 12 A, 65 V AC/DC surface mount board mount fuse manufactured by Littelfuse Inc. as part of the NANO²® 453 series. This fast-blow fuse is designed for SMD applications requiring compact form factor protection in the 2-SMD, Square End Block package. The part is currently active in production with full RoHS3 compliance and CSA/UL approvals. Alternative equivalent parts may be required due to inventory constraints, design revisions, or supply chain considerations.

Key Parameters

Parameter	Value
Current Rating	12 A
Voltage Rating (AC)	65 V
Voltage Rating (DC)	65 V
Response Time	Fast Blow
Mounting Type	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	2-SMD, Square End Block
Operating Temperature Range	-55°C to 125°C
Approval Agencies	CSA, UL

Substitute Part Grouping Explanation

Substitute parts for the 0453012.MR are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are: current rating (12 A), response time (Fast Blow), mounting type (Surface Mount), and package configuration (2-SMD, Square End Block). Voltage ratings and breaking capacity are secondary considerations that determine the scope of application compatibility.

The 0451012.MRL from Littelfuse Inc. is a parametric equivalent within the same manufacturer family, differing only in series designation (NANO²® 451 versus NANO²® 453) while maintaining identical electrical and mechanical specifications.

The SF-2410F1200T-2 from Bourns Inc. is a direct manufacturer alternative that maintains the same current rating, response time, mounting type, and package configuration. This substitute operates at higher voltage ratings (86 V AC/DC versus 65 V AC/DC) and exhibits different breaking capacity and melting I²t characteristics, making it suitable for applications where the higher voltage specification does not create design conflicts.

Parameter Comparison

Parameter	0453012.MR (Main)	0451012.MRL (Littelfuse)	SF-2410F1200T-2 (Bourns)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.
Current Rating (Amps)	12 A	12 A	12 A
Voltage Rating - AC	65 V	65 V	86 V
Voltage Rating - DC	65 V	65 V	86 V
Response Time	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block
Breaking Capacity @ Rated Voltage	50 A	50 A	200 A
Melting I²t	47.97	47.97	52.91
DC Cold Resistance (Ohms)	0.0049	0.0049	0.0045
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agencies	CSA, UL	CSA, UL	cUL, UL
Product Status	Active	Active	Active

Engineering Selection Recommendations

The 0451012.MRL is the preferred parametric equivalent for direct replacement of the 0453012.MR. Both parts are manufactured by Littelfuse Inc., maintain identical electrical and mechanical specifications, and carry equivalent CSA and UL certifications. Selection between these two Littelfuse parts should be based on inventory availability and supply chain considerations, as no functional differences exist.

The SF-2410F1200T-2 from Bourns Inc. is suitable as an alternative where circuit design permits operation at higher voltage ratings (86 V AC/DC). This substitute provides increased breaking capacity (200 A versus 50 A) and lower DC cold resistance (0.0045 Ohms versus 0.0049 Ohms). The SF-2410F1200T-2 carries cUL and UL certifications and is ROHS3 compliant. Selection of this substitute requires verification that the higher voltage rating does not conflict with circuit design specifications or component derating requirements.

Frequently Asked Questions (FAQ)

Q: Can the 0451012.MRL be used as a direct replacement for the 0453012.MR?

A: Yes. The 0451012.MRL is a parametric equivalent with identical current rating, voltage ratings, response time, package configuration, and operating temperature range. Both parts are manufactured by Littelfuse Inc. and carry the same regulatory approvals.

Q: What are the key differences between the 0453012.MR and the SF-2410F1200T-2?

A: The SF-2410F1200T-2 operates at higher voltage ratings (86 V AC/DC versus 65 V AC/DC), has increased breaking capacity (200 A versus 50 A), and exhibits lower DC cold resistance (0.0045 Ohms versus 0.0049 Ohms). Current rating, response time, mounting type, and package configuration remain identical.

Q: Is the SF-2410F1200T-2 compatible with circuits designed for the 0453012.MR?

A: Compatibility depends on circuit design specifications. The higher voltage rating of the SF-2410F1200T-2 makes it suitable for applications where the 0453012.MR's 65 V rating is not a limiting factor. The increased breaking capacity and lower resistance may affect circuit behavior and require design review.

Q: Are all three parts RoHS3 compliant?

A: Yes. The 0453012.MR, 0451012.MRL, and SF-2410F1200T-2 are all ROHS3 compliant.

Q: What regulatory approvals apply to these fuses?

A: The 0453012.MR and 0451012.MRL carry CSA and UL approvals. The SF-2410F1200T-2 carries cUL and UL approvals. All three parts meet the regulatory requirements for their respective applications.

Q: Can these parts be used interchangeably in high-reliability applications?

A: The 0451012.MRL is fully interchangeable with the 0453012.MR. The SF-2410F1200T-2 requires design verification due to differences in voltage rating, breaking capacity, and melting I²t characteristics before use in high-reliability applications.

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