0603SFS450F/32-2 Equivalent & Substitute Parts

Part Overview

The 0603SFS450F/32-2 is a surface mount board mount fuse manufactured by Littelfuse Inc., rated for 4.5 A at 32 V DC with slow blow response characteristics. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The part is housed in a 0603 (1608 Metric) package suitable for automated assembly processes.

Substiute Parts

0603SFS450F/32-2

Littelfuse Inc.In Stock: 171490603SFS450F/32-2 Datasheet

Current PartRFQ

SF-0603SP450M-2

Bourns Inc.In Stock: 5714SF-0603SP450M-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0603SFS450F/32-2 is determined by strict equivalence across the following critical parameters:

• Current Rating: 4.5 A (exact match required)
• Voltage Rating (DC): 32 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 0603 (1608 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)
• Melting I²t: 2.7 (exact match required)
• DC Cold Resistance: 0.015 Ohms (exact match required)

The SF-0603SP450M-2 manufactured by Bourns Inc. meets all substitution criteria and is classified as an active product, providing continuity for applications currently using the obsolete 0603SFS450F/32-2.

Parameter Comparison

Engineering Selection Recommendations

The SF-0603SP450M-2 is the qualified substitute for the obsolete 0603SFS450F/32-2. Both components are ROHS3 compliant and carry identical electrical and mechanical specifications across all critical parameters. The Bourns part maintains active product status, ensuring long-term availability and supply chain continuity. The extended operating temperature range of the SF-0603SP450M-2 (-55°C ~ 150°C versus -55°C ~ 125°C) provides additional thermal margin without compromising compatibility. Both parts are suitable for automated surface mount assembly and carry MSL 1 moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Can the SF-0603SP450M-2 be used as a direct replacement for the 0603SFS450F/32-2?

A: Yes. Both components share identical current rating (4.5 A), voltage rating (32 V DC), response time (Slow Blow), package (0603 / 1608 Metric), and all electrical parameters including breaking capacity, melting I²t, and DC cold resistance.

Q: What is the primary reason for substitution?

A: The 0603SFS450F/32-2 is classified as obsolete. The SF-0603SP450M-2 is an active product from Bourns Inc., providing assured long-term availability and supply chain support.

Q: Are there any differences in compliance or certifications?

A: Both parts are ROHS3 compliant and carry MSL 1 moisture sensitivity classification. The SF-0603SP450M-2 includes REACH Unaffected status. Both share identical ECCN (EAR99) and HTSUS (8536.10.0040) classifications.

Q: Does the extended operating temperature range of the substitute affect compatibility?

A: No. The SF-0603SP450M-2 operating range (-55°C ~ 150°C) encompasses the original part's range (-55°C ~ 125°C), providing additional thermal margin without introducing incompatibility.

Q: Are there packaging differences between the two parts?

A: The 0603SFS450F/32-2 packaging information is not specified in the original data. The SF-0603SP450M-2 is supplied in Tape & Reel (TR) format, standard for surface mount 0603 components in automated assembly environments.