Littelfuse 0453003.NR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0453003.NR is a 3 A, 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, high-density PCB integration. The part is active and in production with full regulatory compliance (CSA, PSE, UL). Substitute parts are identified when original stock is unavailable, when alternative packaging formats are required, or when equivalent performance characteristics from alternative manufacturers meet application requirements.

Substiute Parts

0453003.NR

Littelfuse Inc.In Stock: 7390453003.NR Datasheet

Current PartRFQ

0448003.MR

Littelfuse Inc.In Stock: 171320448003.MR Datasheet

Parametric EquivalentRFQ

0451003.MRL

Littelfuse Inc.In Stock: 302130451003.MRL Datasheet

Parametric EquivalentRFQ

0451003.NRL

Littelfuse Inc.In Stock: 103060451003.NRL Datasheet

Parametric EquivalentRFQ

0453003.MR

Littelfuse Inc.In Stock: 566290453003.MR Datasheet

Parametric EquivalentRFQ

SF-2410FP300T-2

Bourns Inc.In Stock: 2653SF-2410FP300T-2 Datasheet

DirectRFQ

SF-2410HI300T-2

Bourns Inc.In Stock: 3429SF-2410HI300T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0453003.NR are grouped into two categories based on substitution criteria:

Littelfuse NANO²® Series (Parametric Equivalents): Parts 0448003.MR, 0451003.MRL, 0451003.NRL, and 0453003.MR share identical electrical specifications (3 A, 125 V AC/DC, fast-blow response, 50 A breaking capacity) and mechanical form factor (2-SMD, Square End Block, 6.10mm x 2.69mm x 2.69mm). These parts differ only in packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®) and series designation within the NANO²® product line. Substitution is valid when packaging compatibility with assembly equipment is confirmed.

Bourns SinglFuse™ Series (Direct Manufacturer Equivalents): Parts SF-2410FP300T-2 and SF-2410HI300T-2 are from an alternative manufacturer and meet the same electrical requirements (3 A, 125 V AC/DC, fast-blow, 50 A breaking capacity) and mechanical specifications (2-SMD, Square End Block, 6.10mm x 2.59mm x 2.59mm). These parts have slightly different dimensional tolerances and DC cold resistance values but maintain functional equivalence for circuit protection applications.

Key Parameters Determining Substitution:

• Current Rating: 3 A (mandatory match)
• Voltage Rating: 125 V AC and 125 V DC (mandatory match)
• Response Time: Fast Blow (mandatory match)
• Package / Case: 2-SMD, Square End Block (mandatory match)
• Breaking Capacity: 50 A (mandatory match)
• Mounting Type: Surface Mount (mandatory match)

Parameter Comparison

Engineering Selection Recommendations

Littelfuse NANO²® Series Substitutes (0448003.MR, 0451003.MRL, 0451003.NRL, 0453003.MR): These parts maintain identical electrical performance and regulatory compliance (CSA, PSE, UL certifications). Selection among these options is determined by packaging format compatibility with assembly equipment. The 0451003.MRL and 0448003.MR are available in Cut Tape & Digi-Reel® format, suitable for automated pick-and-place systems with reel-based feeders. The 0451003.NRL and 0453003.MR are supplied in Tape & Reel format. All four parts are active products with established supply chains.

Bourns SinglFuse™ Series Substitutes (SF-2410FP300T-2, SF-2410HI300T-2): These parts meet all mandatory electrical and mechanical requirements and carry UL and cUL certifications. The SF-2410FP300T-2 exhibits lower melting I²t (1.548 vs. 1.65), indicating faster thermal response. The SF-2410HI300T-2 has significantly higher melting I²t (24.99), indicating slower thermal response and is subject to REACH compliance requirements. Selection between Bourns alternatives depends on thermal response characteristics required by the application circuit.

Primary Selection Criteria:

• Verify assembly equipment compatibility with packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®)
• Confirm thermal response requirements (melting I²t values) for circuit protection timing
• Validate regulatory compliance requirements for target application region
• Confirm PCB layout accommodates dimensional tolerances (Littelfuse: 6.10mm x 2.69mm x 2.69mm; Bourns: 6.10mm x 2.59mm x 2.59mm)

Frequently Asked Questions (FAQ)

Q: Can I substitute 0453003.NR with 0451003.NRL? A: Yes. Both parts have identical electrical specifications (3 A, 125 V AC/DC, fast-blow, 50 A breaking capacity), identical melting I²t (1.65), identical DC cold resistance (0.0227 Ω), and identical physical dimensions (6.10mm x 2.69mm x 2.69mm). Both are supplied in Tape & Reel packaging and carry CSA, PSE, and UL certifications. Substitution is direct.

Q: What is the difference between 0448003.MR and 0451003.MRL? A: Both parts are electrically equivalent (3 A, 125 V AC/DC, fast-blow, 50 A breaking capacity) with identical physical dimensions. The primary difference is packaging format: 0448003.MR is supplied in Cut Tape & Digi-Reel® format, while 0451003.MRL is supplied in Cut Tape & Digi-Reel® format. The 0448003.MR has slightly higher melting I²t (1.72 vs. 1.65) and higher DC cold resistance (0.02445 Ω vs. 0.0227 Ω). Selection depends on assembly equipment compatibility and thermal response requirements.

Q: Can I use Bourns SF-2410FP300T-2 as a direct replacement? A: Yes, with dimensional verification. The SF-2410FP300T-2 meets all electrical requirements (3 A, 125 V AC/DC, fast-blow, 50 A breaking capacity) and carries UL and cUL certifications. The physical dimensions are 6.10mm x 2.59mm x 2.59mm (vs. Littelfuse 6.10mm x 2.69mm x 2.69mm). Verify PCB layout accommodates the 0.10mm width and height reduction. The melting I²t is 1.548, indicating faster thermal response than the 0453003.NR (1.65).

Q: What does melting I²t indicate? A: Melting I²t is a thermal characteristic that indicates the fuse element's thermal response time. Lower values indicate faster thermal response and quicker fuse operation. Higher values indicate slower thermal response. When selecting substitutes, confirm the melting I²t value is appropriate for the circuit protection timing requirements of your application.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (Littelfuse NANO²® and Bourns SinglFuse™ series) are RoHS3 compliant. The SF-2410HI300T-2 is subject to REACH compliance requirements; all other parts are REACH unaffected.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging? A: Tape & Reel (TR) packaging supplies components on a continuous reel suitable for standard pick-and-place equipment. Cut Tape & Digi-Reel® packaging provides components on cut tape segments and is compatible with specific automated feeders. Selection depends on your assembly equipment's feeder compatibility. Verify your equipment specifications before selecting packaging format.

Q: Can I mix different substitute parts in the same production run? A: All listed substitute parts meet identical electrical specifications and are functionally equivalent. However, verify that your assembly equipment can handle different packaging formats and that PCB layout accommodates any dimensional variations (particularly the Bourns parts, which have slightly different width and height dimensions).