Bel Fuse Inc. C1S 2.5 Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. C1S 2.5 is a 2.5 A surface mount board fuse rated for 63 V AC/DC operation in a 1206 (3216 Metric) package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The substitute part maintains identical electrical ratings and mechanical compatibility while offering active product status and expanded certification coverage.

Substiute Parts

C1S 2.5

Bel Fuse Inc.In Stock: 1104C1S 2.5 Datasheet

Current PartRFQ

0685T2500-01

Bel Fuse Inc.In Stock: 1545910685T2500-01 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 0685T2500-01 qualifies as a direct functional equivalent based on the following criteria:

• Current Rating: Identical at 2.5 A
• Voltage Rating: Identical at 63 V AC and 63 V DC
• Fuse Type: Identical board mount classification
• Mounting Type: Identical surface mount configuration
• Package / Case: Identical 1206 (3216 Metric) footprint
• Response Time: Identical slow blow characteristic
• Operating Temperature Range: Identical -55°C ~ 125°C specification
• Breaking Capacity: Identical 50 A @ rated voltage
• DC Cold Resistance: Identical 0.072 Ohms
• Regulatory Compliance: Both ROHS3 compliant and REACH unaffected

The substitute part differs in product status (active vs. obsolete), series designation (C1T vs. C1S), packaging format (Tape & Reel vs. standard), and melting I²t value (1.07 vs. 0.4). These differences do not affect electrical or mechanical substitutability.

Parameter Comparison

Engineering Selection Recommendations

The 0685T2500-01 is the direct substitute for the obsolete C1S 2.5. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications. The substitute part carries active product status, ensuring continued availability and manufacturing support. Both components meet ROHS3 compliance and REACH requirements, with approval from CE and cURus certification bodies. The substitute part additionally carries AEC-Q200 qualification, providing enhanced reliability documentation for automotive and high-reliability applications. Selection of the substitute part eliminates obsolescence risk while maintaining full functional compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 0685T2500-01 be used as a direct replacement for the C1S 2.5 in existing designs?

A: Yes. Both parts share identical current rating (2.5 A), voltage rating (63 V AC/DC), package footprint (1206), mounting type (surface mount), response time (slow blow), and operating temperature range (-55°C ~ 125°C). No circuit modifications are required.

Q: What is the difference between the C1S 2.5 and 0685T2500-01?

A: The primary differences are product status (obsolete vs. active), series designation (C1S vs. C1T), packaging format (standard vs. Tape & Reel), and melting I²t value (0.4 vs. 1.07). Electrical and mechanical performance are identical.

Q: Does the substitute part fit the same PCB footprint?

A: Yes. Both parts use the 1206 (3216 Metric) package with identical dimensions of 0.126" L x 0.062" W. The substitute part height is 0.025" compared to 0.023" for the main part, a negligible difference that does not affect PCB assembly compatibility.

Q: Are there any certification differences between the two parts?

A: Both parts are CE and cURus approved. The substitute part additionally carries AEC-Q200 qualification. Both are ROHS3 compliant and REACH unaffected.

Q: What is the inventory status of these parts?

A: The C1S 2.5 has 1,076 pieces in stock with obsolete status. The 0685T2500-01 has 154,568 pieces in stock with active product status, ensuring long-term availability.