Littelfuse 04483.15MR Surface Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 04483.15MR is a 3.15 A, 125 V AC/DC surface mount board fuse in the NANO²® 448 series. This fast-blow fuse is designed for circuit protection in applications requiring compact, high-reliability fusing solutions. The part is active in production with full inventory availability. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and approval certifications to ensure direct functional interchangeability in board-level applications.

Substiute Parts

04483.15MR

Littelfuse Inc.In Stock: 168404483.15MR Datasheet

Current PartRFQ

04513.15MRL

Littelfuse Inc.In Stock: 12250204513.15MRL Datasheet

Parametric EquivalentRFQ

04533.15MR

Littelfuse Inc.In Stock: 2008604533.15MR Datasheet

Parametric EquivalentRFQ

SF-2410FP315T-2

Bourns Inc.In Stock: 2492SF-2410FP315T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 04483.15MR is determined by the following critical parameters:

• Current Rating: 3.15 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Breaking Capacity: 50 A (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Approval Agencies: CSA, UL, PSE certifications (equivalent or superset required)

All identified substitute parts meet these criteria. Variations in melting I²t, DC cold resistance, and dimensional tolerances within the specified range do not affect functional interchangeability in standard circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active production components with full regulatory compliance. Selection among equivalent parts should be based on the following factors:

Littelfuse NANO²® Series (04483.15MR, 04513.15MRL, 04533.15MR): These parts share identical electrical ratings, voltage specifications, and approval certifications (CSA, UL, PSE). The primary differences are melting I²t values and DC cold resistance, which reflect design variations across the NANO²® 448, 451, and 453 series generations. All three are suitable for direct substitution in applications where the original part is specified.

Bourns SinglFuse™ SF-2410FP315T-2: This part meets all critical electrical and mechanical requirements with UL and cUL certifications. The dimensional variation (0.102" W x 0.102" H versus 0.106" W x 0.106" H) and higher melting I²t value (2.6485 versus 1.81–1.92) represent design differences in the SinglFuse™ platform. This part is suitable for applications where board layout accommodates the slightly smaller footprint and where the thermal response characteristics are compatible with circuit protection requirements.

All parts are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1) ratings, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 04513.15MRL (NANO²® 451) be used as a direct replacement for the 04483.15MR (NANO²® 448)?

A: Yes. Both parts share identical current ratings (3.15 A), 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). The difference in melting I²t (1.92 versus 1.81) reflects design improvements in the 451 series and does not affect functional interchangeability.

Q: What is the difference between the Littelfuse NANO²® series and the Bourns SinglFuse™ SF-2410FP315T-2?

A: Both product lines meet the same electrical specifications (3.15 A, 125 V AC/DC, fast blow, 50 A breaking capacity). The primary differences are manufacturer-specific design implementations reflected in melting I²t values (1.81–1.92 for NANO²® versus 2.6485 for SinglFuse™) and minor dimensional variations (0.106" versus 0.102" width and height). Both are approved by UL; NANO²® parts carry CSA and PSE approvals, while SinglFuse™ carries cUL approval.

Q: Are there any board layout considerations when substituting the Bourns SF-2410FP315T-2 for a Littelfuse part?

A: The Bourns SF-2410FP315T-2 has a slightly smaller footprint (0.102" W x 0.102" H) compared to Littelfuse NANO²® parts (0.106" W x 0.106" H). This 0.004" reduction in width and height is within standard PCB design tolerances and does not require layout modifications for most applications. Verify pad spacing and clearance requirements for your specific board design.

Q: Do all substitute parts carry the same regulatory approvals?

A: Littelfuse NANO²® parts (04483.15MR, 04513.15MRL, 04533.15MR) carry CSA, UL, and PSE approvals. The Bourns SF-2410FP315T-2 carries cUL and UL approvals. For applications requiring CSA or PSE certification, use Littelfuse parts. For applications requiring only UL certification, all parts are suitable.

Q: What is the significance of DC cold resistance variations among these parts?

A: DC cold resistance values (0.023 Ohms for 04483.15MR, 0.0215 Ohms for 04513.15MRL and 04533.15MR, and 0.033 Ohms for SF-2410FP315T-2) reflect design differences in fuse element construction. These variations are within acceptable ranges for 3.15 A fuses and do not affect circuit protection performance in standard applications. All values remain well below thresholds that would cause thermal issues in typical board-level circuits.

Q: Can these fuses be used interchangeably in both AC and DC circuits?

A: Yes. All listed parts are rated for both 125 V AC and 125 V DC operation. The fast-blow response time and 50 A breaking capacity apply to both AC and DC applications within the specified voltage range.