Littelfuse 045201.5NRL Surface Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 045201.5NRL is a 1.5 A, 125 V AC/DC surface mount board fuse in the NANO²® 452 series. This slow-blow fuse is designed for circuit protection in applications requiring board-level mounting with SMD packaging. The part is currently active in production with full inventory availability. Equivalent and substitute parts are identified for applications where alternative series options, packaging formats, or inventory considerations necessitate component selection alternatives.

Substiute Parts

045201.5NRL

Littelfuse Inc.In Stock: 5404045201.5NRL Datasheet

Current PartRFQ

044901.5MR

Littelfuse Inc.In Stock: 2443044901.5MR Datasheet

Parametric EquivalentRFQ

045201.5MRL

Littelfuse Inc.In Stock: 40254045201.5MRL Datasheet

Parametric EquivalentRFQ

045401.5MR

Littelfuse Inc.In Stock: 4359045401.5MR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 045201.5NRL are qualified based on strict electrical and mechanical parameter matching. All substitute parts maintain identical current ratings (1.5 A), voltage ratings (125 V AC/DC), response time (Slow Blow), mounting type (Surface Mount), package configuration (2-SMD, Square End Block), physical dimensions (0.240" L x 0.106" W x 0.106" H), breaking capacity (50 A), operating temperature range (-55°C ~ 125°C), and regulatory compliance status (ROHS3 Compliant, MSL 1).

Substitution is determined by the following key parameters:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)

Variations in series designation (NANO²® 452, NANO²® 449, NANO²® 454), packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®), approval agency certifications, and DC cold resistance do not preclude substitution when all primary electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active product status and full regulatory compliance. Selection between the main part (045201.5NRL) and substitute parts should be based on the following factors:

045201.5MRL: Identical electrical and mechanical specifications to the main part with matching DC cold resistance (0.093 Ohms) and melting I²t (3.65). Maintains the same NANO²® 452 series designation and approval agencies (CSA, PSE, UR). Significantly higher inventory availability (40,200 pcs) supports supply chain continuity.

044901.5MR: Functionally equivalent with identical current, voltage, and mechanical parameters. Differs in DC cold resistance (0.1186 Ohms vs. 0.093 Ohms) and melting I²t (4.7 vs. 3.65), reflecting NANO²® 449 series characteristics. Approval agencies include cULus and PSE. Lower inventory (2,360 pcs) may impact availability.

045401.5MR: Electrically and mechanically equivalent with matching DC cold resistance (0.093 Ohms) and melting I²t (3.65). Packaged in Cut Tape (CT) & Digi-Reel® format rather than Tape & Reel. NANO²® 454 series designation with CSA, PSE, and UL approvals. Suitable for applications where alternative packaging formats are acceptable.

Frequently Asked Questions (FAQ)

Q: Can 045201.5MRL be used as a direct replacement for 045201.5NRL?

A: Yes. Both parts are identical in all critical electrical and mechanical parameters: 1.5 A current rating, 125 V AC/DC voltage rating, slow-blow response, 2-SMD square end block package, 0.240" x 0.106" x 0.106" dimensions, 50 A breaking capacity, and -55°C to 125°C operating range. The primary difference is packaging format (both Tape & Reel) and higher inventory availability for 045201.5MRL.

Q: What is the difference between 044901.5MR and the main part?

A: The 044901.5MR maintains identical electrical and mechanical specifications for circuit protection applications. The NANO²® 449 series exhibits different thermal characteristics: DC cold resistance of 0.1186 Ohms (vs. 0.093 Ohms) and melting I²t of 4.7 (vs. 3.65). Approval agencies differ (cULus, PSE vs. CSA, PSE, UR). These differences do not affect substitution eligibility when electrical and mechanical parameters match.

Q: Can I use 045401.5MR if my design specifies Tape & Reel packaging?

A: The 045401.5MR is packaged in Cut Tape (CT) & Digi-Reel® format rather than standard Tape & Reel. If your assembly process requires Tape & Reel packaging, 045201.5MRL or 045201.5NRL are appropriate selections. If your process accommodates alternative packaging formats, 045401.5MR is electrically and mechanically equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed—045201.5NRL, 045201.5MRL, 044901.5MR, and 045401.5MR—are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: Which part should I select for maximum inventory availability?

A: The 045201.5MRL offers the highest inventory level at 40,200 pcs, compared to 5,300 pcs for 045201.5NRL, 4,300 pcs for 045401.5MR, and 2,360 pcs for 044901.5MR. All parts maintain active product status.