Littelfuse 0451007.NRL Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0451007.NRL is a 7 A 125 V AC/DC surface mount board mount fuse in the NANO²® 451 series. This fast blow fuse is designed for circuit protection in applications requiring 2-SMD, square end block packaging. The part is active and widely stocked, with 5007 units available in Tape & Reel packaging. Equivalent and substitute parts are identified for applications where packaging format, series variant, or manufacturer preference necessitates alternative component selection while maintaining electrical and mechanical compatibility.

Substiute Parts

0451007.NRL

Littelfuse Inc.In Stock: 50200451007.NRL Datasheet

Current PartRFQ

0448007.MR

Littelfuse Inc.In Stock: 171340448007.MR Datasheet

Parametric EquivalentRFQ

0451007.MRL

Littelfuse Inc.In Stock: 402850451007.MRL Datasheet

Parametric EquivalentRFQ

0453007.MR

Littelfuse Inc.In Stock: 158120453007.MR Datasheet

Parametric EquivalentRFQ

0476007.MR

Littelfuse Inc.In Stock: 25460476007.MR Datasheet

Parametric EquivalentRFQ

SF-2410FP700T-2

Bourns Inc.In Stock: 2928SF-2410FP700T-2 Datasheet

DirectRFQ

SF-2410HI700T-2

Bourns Inc.In Stock: 2069SF-2410HI700T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on substitution criteria:

Littelfuse NANO²® Series Equivalents (Parametric Equivalents): Parts 0448007.MR, 0451007.MRL, 0453007.MR, and 0476007.MR share identical electrical ratings (7 A, 125 V AC/DC, Fast Blow) and mechanical dimensions (0.240" L x 0.106" W x 0.106" H). These parts differ by series designation, packaging format (Tape & Reel versus Cut Tape & Digi-Reel®), and in the case of 0476007.MR, breaking capacity and melting I²t characteristics. All maintain the same mounting type, fuse type classification, and temperature operating range.

Bourns SinglFuse™ Series (Direct Manufacturer Alternatives): Parts SF-2410FP700T-2 and SF-2410HI700T-2 are manufactured by Bourns Inc. and provide direct functional equivalence with identical electrical ratings and response time. These parts feature slightly different mechanical dimensions (0.240" L x 0.102" W x 0.102" H) and melting I²t values but maintain compatibility with 2-SMD, square end block footprints and the same operating temperature range.

Key Parameters Determining Substitution:

• Current Rating: 7 A (all parts)
• Voltage Rating: 125 V AC / 125 V DC (all parts)
• Response Time: Fast Blow (all parts)
• Mounting Type: Surface Mount (all parts)
• Package / Case: 2-SMD, Square End Block (all parts)
• Operating Temperature: -55°C ~ 125°C (all parts)

Parameter Comparison

Engineering Selection Recommendations

Littelfuse NANO²® 451 Series (0451007.NRL / 0451007.MRL): Select these parts when maintaining the original series specification is required. Both variants are active products with CSA, PSE, and UL approvals. The 0451007.MRL offers higher inventory availability (40200 units) in Cut Tape & Digi-Reel® packaging, suitable for automated assembly environments. The 0451007.NRL maintains Tape & Reel packaging with 5007 units in stock.

Littelfuse NANO²® 448 Series (0448007.MR): This variant provides the highest inventory availability (17043 units) among Littelfuse options. It maintains identical electrical ratings and DC cold resistance to the primary part. The melting I²t value of 13.92 is higher than the 0451007.NRL (10.32), which may affect thermal response characteristics in specific circuit designs. CSA, UL, and PSE approvals are maintained.

Littelfuse NANO²® 453 Series (0453007.MR): This part offers 15723 units in stock with identical melting I²t (10.32) and DC cold resistance (0.009 Ohms) to the primary part. Available in Cut Tape & Digi-Reel® packaging. CSA, PSE, and UL approvals are maintained.

Littelfuse NANO²® 476 Series (0476007.MR): This variant features enhanced breaking capacity (100A AC, 300A DC versus 50A) and lower melting I²t (7.8 versus 10.32). The DC cold resistance is higher at 0.0116 Ohms. This part carries cURus approval rather than CSA/PSE/UL. Select this variant only when higher breaking capacity is a design requirement.

Bourns SinglFuse™ SF-2410FP700T-2: This part provides direct manufacturer equivalence with 2834 units available. Mechanical dimensions are slightly reduced (0.102" W x 0.102" H versus 0.106" W x 0.106" H). Melting I²t is 9.016, lower than the primary part. cUL and UL approvals are maintained. REACH status is unaffected.

Bourns SinglFuse™ SF-2410HI700T-2: This variant offers 2006 units in stock with significantly higher melting I²t (100.06) and lower DC cold resistance (0.0083 Ohms). Mechanical dimensions match the SF-2410FP700T-2. cUL and UL approvals are maintained. REACH status is affected.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0451007.NRL with 0451007.MRL? A: Yes. Both parts are from the NANO²® 451 series with identical electrical ratings, melting I²t (10.32), and DC cold resistance (0.009 Ohms). The primary difference is packaging format: 0451007.NRL is Tape & Reel, while 0451007.MRL is Cut Tape & Digi-Reel®. Selection depends on assembly equipment compatibility and inventory requirements.

Q: What is the difference between Littelfuse and Bourns fuses in this list? A: Littelfuse parts (0451007.NRL, 0448007.MR, 0451007.MRL, 0453007.MR, 0476007.MR) are from the NANO²® series. Bourns parts (SF-2410FP700T-2, SF-2410HI700T-2) are from the SinglFuse™ series. All maintain identical electrical ratings (7 A, 125 V AC/DC, Fast Blow). Bourns parts have slightly smaller mechanical dimensions (0.102" versus 0.106" width and height). Both manufacturers provide cUL/UL approvals.

Q: Why does 0476007.MR have different breaking capacity? A: The 0476007.MR is specified with 100A AC and 300A DC breaking capacity, compared to 50A for other parts. This is a design characteristic of the NANO²® 476 series. The melting I²t is also lower (7.8 versus 10.32). This part should be selected only when higher breaking capacity is a circuit design requirement.

Q: What does melting I²t indicate? A: Melting I²t is a thermal characteristic that indicates the energy required to melt the fuse element. Lower values indicate faster thermal response. The primary part (0451007.NRL) has a melting I²t of 10.32. Alternatives with different values (such as 0448007.MR at 13.92 or SF-2410HI700T-2 at 100.06) will have different thermal response characteristics and should be evaluated against circuit protection requirements.

Q: Are all these parts RoHS3 compliant? A: Yes. All parts listed are ROHS3 compliant. Moisture Sensitivity Level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging? A: Tape & Reel (TR) packaging is continuous reel format suitable for high-speed automated pick-and-place equipment. Cut Tape & Digi-Reel® (CT) is pre-cut tape on a reel, suitable for lower-volume production or manual assembly. Both formats contain the same components; selection depends on assembly process requirements and equipment compatibility.

Q: Which part has the highest inventory availability? A: The 0451007.MRL (NANO²® 451, Cut Tape & Digi-Reel®) has the highest inventory with 40200 units in stock. The 0448007.MR (NANO²® 448, Tape & Reel) is the second highest with 17043 units.

Q: Can I use SF-2410HI700T-2 as a direct replacement for 0451007.NRL? A: Electrical substitution is possible due to identical current rating (7 A), voltage rating (125 V AC/DC), and response time (Fast Blow). However, the SF-2410HI700T-2 has significantly different melting I²t (100.06 versus 10.32) and lower DC cold resistance (0.0083 versus 0.009 Ohms). Mechanical dimensions are also slightly smaller (0.102" versus 0.106" width and height). Verify circuit protection requirements and PCB footprint compatibility before substitution.