Equivalent & Substitute Parts for C1S 5 Surface Mount Fuse

Part Overview

The C1S 5 is a 5A 63V AC/DC board mount surface mount fuse in 1206 (3216 Metric) package manufactured by Bel Fuse Inc. This fuse is designed for circuit protection in applications requiring slow blow response characteristics. The product is currently obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Substiute Parts

C1S 5

Bel Fuse Inc.In Stock: 1193C1S 5 Datasheet

Current PartRFQ

0685T5000-01

Bel Fuse Inc.In Stock: 23640685T5000-01 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0685T5000-01 qualifies as a direct substitute for the C1S 5 based on the following critical electrical and mechanical parameters:

• Current Rating: 5 A (identical)
• Voltage Rating AC: 63 V (identical)
• Voltage Rating DC: 63 V (identical)
• Response Time: Slow Blow (identical)
• Package / Case: 1206 (3216 Metric) (identical)
• Mounting Type: Surface Mount (identical)
• Fuse Type: Board Mount (Cartridge Style Excluded) (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)
• Breaking Capacity @ Rated Voltage: 50 A (identical)

The substitute part maintains full electrical and mechanical compatibility with the original design specification.

Parameter Comparison

Engineering Selection Recommendations

The 0685T5000-01 is the recommended substitute for the obsolete C1S 5. Both parts are manufactured by Bel Fuse Inc. and maintain identical electrical specifications and package dimensions. The substitute part carries active product status, ensuring continued availability and supply chain support.

The 0685T5000-01 includes AEC-Q200 automotive qualification in addition to CE and cURus certifications, providing enhanced reliability documentation. Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the 0685T5000-01 be used as a direct replacement for the C1S 5?

A: Yes. Both parts share identical current rating (5 A), voltage ratings (63 V AC/DC), response time (Slow Blow), package (1206), and mounting type (Surface Mount). Electrical and mechanical compatibility is complete.

Q: What is the difference in melting I²t values between the two parts?

A: The C1S 5 has a melting I²t of 3.1, while the 0685T5000-01 has 5.3. Both values fall within the acceptable range for 5 A slow blow fuses and do not affect substitution eligibility based on the specified parameters.

Q: Are there packaging differences between these parts?

A: The C1S 5 is listed with standard packaging, while the 0685T5000-01 is available in Cut Tape (CT) and Digi-Reel® packaging options. Physical dimensions are nearly identical (height difference of 0.002" / 0.05mm is negligible for PCB assembly).

Q: What certifications does the substitute part carry?

A: The 0685T5000-01 carries AEC-Q200, CE, and cURus certifications. The original C1S 5 carries CE and cURus certifications. Both meet the compliance requirements for standard industrial applications.

Q: Is the DC cold resistance difference significant?

A: The DC cold resistance values (0.022 Ohms for C1S 5 versus 0.021 Ohms for 0685T5000-01) are functionally equivalent for circuit protection applications and do not impact substitution compatibility.