0603SFP450F/32-2 Equivalent & Substitute Parts

Part Overview

The 0603SFP450F/32-2 is a surface mount board mount fuse rated at 4.5A, 32VDC in 0603 (1608 Metric) package form factor. Manufactured by Littelfuse Inc., this component is classified as obsolete product status. Due to its obsolete designation, identifying qualified substitute parts with equivalent electrical and mechanical characteristics is essential for ongoing design support and procurement continuity.

Substiute Parts

0603SFP450F/32-2

Littelfuse Inc.In Stock: 9630603SFP450F/32-2 Datasheet

Current PartRFQ

0603SFP450F/32-2

Littelfuse Inc.In Stock: 9630603SFP450F/32-2 Datasheet

Parametric EquivalentRFQ

SF-0603HI450M-2

Bourns Inc.In Stock: 9553SF-0603HI450M-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0603SFP450F/32-2 is determined by strict equivalence across the following parameters:

• Current Rating: 4.5 A (exact match required)
• Voltage Rating (DC): 32 V (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: 50A (exact match required)
• DC Cold Resistance: 0.014 Ohms (exact match required)
• RoHS Status: ROHS3 Compliant (minimum requirement)

The substitute part SF-0603HI450M-2 manufactured by Bourns Inc. meets all specified electrical and mechanical parameters and qualifies as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The SF-0603HI450M-2 from Bourns Inc. is the qualified substitute for the obsolete 0603SFP450F/32-2. This substitute maintains electrical equivalence across all critical parameters: 4.5A current rating, 32VDC voltage rating, 50A breaking capacity, and 0.014 Ohms DC cold resistance. Both components are ROHS3 compliant and feature MSL 1 moisture sensitivity rating.

The Bourns part carries active product status with UL approval agency certification, providing long-term availability and design support. The extended operating temperature range (-55°C ~ 150°C versus -55°C ~ 125°C) and UL certification present additional design margin for applications requiring higher temperature performance or formal approval documentation.

Frequently Asked Questions (FAQ)

Q: Can SF-0603HI450M-2 be used as a direct replacement for 0603SFP450F/32-2?

A: Yes. Both parts share identical electrical specifications (4.5A, 32VDC, 50A breaking capacity, 0.014 Ohms DC cold resistance) and mechanical form factor (0603 surface mount package). Dimensional tolerances are within acceptable PCB assembly margins.

Q: What is the primary reason for substitution?

A: The 0603SFP450F/32-2 is classified as obsolete. The SF-0603HI450M-2 maintains full electrical and mechanical equivalence while offering active product status and improved long-term availability.

Q: Are there packaging differences between these parts?

A: The original part is available in standard inventory. The substitute is supplied in Tape & Reel (TR) packaging, which is standard for high-volume surface mount assembly operations.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant with MSL 1 rating. The substitute carries UL approval certification, which may be required for specific applications or regulatory jurisdictions.

Q: Are there any thermal performance differences?

A: The substitute part supports an extended operating temperature range (-55°C ~ 150°C) compared to the original (-55°C ~ 125°C). This provides additional thermal margin for high-temperature applications.