Littelfuse 0453.750NR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0453.750NR is a 750 mA, 125 V AC/DC surface mount board mount fuse in the NANO²® 453 series. This fast-blow fuse is designed for circuit protection in applications requiring compact SMD packaging with 2-SMD square end block configuration. The part is active in production with full CSA and UL approval certifications. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits cross-manufacturer sourcing while maintaining electrical and mechanical compatibility.

Substiute Parts

0453.750NR

Littelfuse Inc.In Stock: 10990453.750NR Datasheet

Current PartRFQ

0448.750MR

Littelfuse Inc.In Stock: 73420448.750MR Datasheet

Parametric EquivalentRFQ

0451.750MRL

Littelfuse Inc.In Stock: 552290451.750MRL Datasheet

Parametric EquivalentRFQ

0451.750NRL

Littelfuse Inc.In Stock: 100720451.750NRL Datasheet

Parametric EquivalentRFQ

SF-2410FP075T-2

Bourns Inc.In Stock: 2761SF-2410FP075T-2 Datasheet

DirectRFQ

SF-2410HI075T-2

Bourns Inc.In Stock: 9089SF-2410HI075T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0453.750NR are classified into two categories based on substitution criteria:

Parametric Equivalents (Littelfuse NANO²® Series): Parts 0448.750MR, 0451.750MRL, and 0451.750NRL are direct parametric equivalents manufactured by Littelfuse. These parts share identical electrical ratings (750 mA, 125 V AC/DC), response time (fast blow), mounting configuration (surface mount, 2-SMD square end block), physical dimensions (0.240" L x 0.106" W x 0.106" H), operating temperature range (-55°C to 125°C), and approval certifications (CSA, UL). Substitution is based on matching current rating, voltage rating, fuse type, package configuration, and thermal operating range.

Direct Manufacturer Equivalents (Bourns SinglFuse™ Series): Parts SF-2410FP075T-2 and SF-2410HI075T-2 are manufactured by Bourns Inc. and provide cross-manufacturer substitution. These parts maintain identical electrical specifications (750 mA, 125 V AC/DC, fast blow response), mounting type (surface mount), package style (2-SMD square end block), breaking capacity (50 A), and operating temperature range (-55°C to 125°C). Physical dimensions are nearly identical with minor tolerance variations (0.240" L x 0.102" W x 0.102" H versus 0.106" W x 0.106" H on the main part).

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status and carry full regulatory approvals (CSA, UL, or cUL and UL). Selection among Littelfuse NANO²® series equivalents (0448.750MR, 0451.750MRL, 0451.750NRL) is based on availability and packaging format (Tape & Reel). The 0451.750MRL variant offers the highest inventory availability at 55,200 pieces.

Bourns SinglFuse™ parts (SF-2410FP075T-2 and SF-2410HI075T-2) provide cross-manufacturer alternatives with identical electrical ratings and certifications. Both parts are ROHS3 compliant. The SF-2410HI075T-2 carries REACH Affected status, while all other parts are REACH Unaffected. Physical dimensions on Bourns parts show minor width and height variations (2.59mm versus 2.69mm), which remain within standard PCB footprint tolerances for 2-SMD square end block packages.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 0453.750NR with any of the listed parts without circuit redesign?

A: Yes. All listed parts share identical current ratings (750 mA), voltage ratings (125 V AC/DC), response time (fast blow), mounting type (surface mount), package configuration (2-SMD square end block), breaking capacity (50 A), and operating temperature range (-55°C to 125°C). Physical dimensions are equivalent within standard manufacturing tolerances.

Q: What is the difference between Littelfuse NANO²® series variants (453, 448, 451)?

A: The series designation indicates different internal fuse element designs. All three series maintain identical electrical specifications for the 750 mA rating. Differences exist in melting I²t values (0.185 for 453 and 451 series, 0.206 for 448 series) and DC cold resistance (0.245 Ω for 453 and 451 series, 0.2475 Ω for 448 series). These variations are within acceptable tolerance for equivalent substitution.

Q: Are Bourns SinglFuse™ parts fully compatible with Littelfuse NANO²® footprints?

A: Bourns parts maintain the same 2-SMD square end block package style and identical length (6.10mm). Width and height dimensions are 2.59mm versus 2.69mm on Littelfuse parts. This 0.10mm difference per dimension falls within standard PCB footprint design tolerances and does not affect mechanical or electrical compatibility.

Q: What is the significance of the melting I²t parameter in fuse selection?

A: Melting I²t defines the thermal energy required to melt the fuse element. Littelfuse 0453.750NR and 0451 series parts have melting I²t of 0.185, while Bourns SF-2410HI075T-2 has 1.2632. These differences reflect different fuse element materials and designs but do not affect substitutability when current rating, voltage rating, and response time are identical. The fuse will still operate at 750 mA with fast-blow response.

Q: Which substitute part should I select for new designs?

A: For Littelfuse sourcing, the 0451.750MRL offers the highest inventory availability (55,200 pieces) with identical electrical and mechanical specifications to the 0453.750NR. For cross-manufacturer flexibility, both Bourns SinglFuse™ parts (SF-2410FP075T-2 and SF-2410HI075T-2) are qualified alternatives with full UL/cUL certifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts carry ROHS3 Compliant status. The SF-2410HI075T-2 is REACH Affected, while all other parts are REACH Unaffected. Verify REACH compliance requirements for your specific application and end-use region.