1206SFP450F/32-2 Equivalent & Substitute Parts

Part Overview

The 1206SFP450F/32-2 is a surface mount board mount fuse manufactured by Littelfuse Inc., rated for 4.5 A at 32 V DC. This component is classified as Obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. Substitute parts must maintain identical electrical ratings and mechanical compatibility within the 1206 (3216 Metric) package form factor.

Substiute Parts

1206SFP450F/32-2

Littelfuse Inc.In Stock: 49641206SFP450F/32-2 Datasheet

Current PartRFQ

TR/3216FF4.5-R

Eaton - Electronics DivisionIn Stock: 6266TR/3216FF4.5-R Datasheet

DirectRFQ

SF-1206HI450M-2

Bourns Inc.In Stock: 953SF-1206HI450M-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1206SFP450F/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: 1206 (3216 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)
• RoHS Compliance: ROHS3 Compliant (minimum requirement)

The identified substitute parts meet all mandatory electrical and mechanical parameters. Variations in melting I²t, response time classification, and operating temperature upper limits do not preclude substitution when all primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both TR/3216FF4.5-R (Eaton) and SF-1206HI450M-2 (Bourns) are qualified substitutes for the obsolete 1206SFP450F/32-2. Selection between these alternatives is based on the following factors:

TR/3216FF4.5-R (Eaton - Electronics Division):

• Active product status with established supply chain
• Dual voltage rating (32 V AC/DC) provides broader application compatibility
• Fast Blow response time classification
• CSA and UL approvals
• Higher inventory availability (6185 units)
• Tape & Reel packaging standard for automated assembly

SF-1206HI450M-2 (Bourns Inc.):

• Active product status with established supply chain
• Extended operating temperature range (-55°C ~ 150°C) for high-temperature applications
• Melting I²t value (3.2) matches the original part specification
• UL approval
• Tape & Reel packaging standard for automated assembly
• REACH Unaffected status

Both parts satisfy all mandatory electrical and mechanical substitution criteria. Selection should be based on application-specific requirements including voltage type (AC/DC), temperature environment, and response time characteristics.

Frequently Asked Questions (FAQ)

Q: Can TR/3216FF4.5-R replace 1206SFP450F/32-2 in all applications? A: TR/3216FF4.5-R meets all mandatory electrical and mechanical parameters. The Fast Blow response time and dual AC/DC voltage rating provide equivalent or enhanced functionality. Verify application-specific response time requirements before substitution.

Q: What is the difference between the melting I²t values of the substitute parts? A: Melting I²t (3.2 for Littelfuse and Bourns; 0.405 for Eaton) indicates thermal energy required to melt the fuse element. The Eaton part exhibits faster thermal response. Both values are within the 50 A breaking capacity specification. Application thermal characteristics determine which value is appropriate.

Q: Are the physical dimensions of substitute parts identical? A: All parts conform to the 1206 (3216 Metric) package standard. Littelfuse and Bourns parts share identical dimensions (0.126" L x 0.063" W x 0.038" H). Eaton's TR/3216FF4.5-R has a slightly reduced height (0.035" vs 0.038"), which remains compatible with standard 1206 footprints.

Q: Do substitute parts require different PCB footprints? A: No. All substitute parts use the 1206 (3216 Metric) surface mount package and are compatible with existing PCB designs for the original part.

Q: Which substitute part has better long-term availability? A: Both TR/3216FF4.5-R (Eaton) and SF-1206HI450M-2 (Bourns) are classified as Active products. Eaton currently maintains higher inventory (6185 units vs 922 units). Consult with component distributors for current lead times and allocation status.

Q: Can I use these substitutes in high-temperature environments? A: SF-1206HI450M-2 (Bourns) supports operating temperatures to 150°C, exceeding the original specification of 125°C. TR/3216FF4.5-R (Eaton) maintains the original 125°C upper limit. Select based on application temperature requirements.