SCHURTER 3404.0049.11 Equivalent & Substitute Parts

Part Overview

The SCHURTER 3404.0049.11 is a 125 mA, 125 V AC/DC surface mount board mount fuse in 2-SMD J-Lead package configuration. This component is classified as Active product status and is designed for circuit protection applications requiring fast-blow response characteristics. Equivalent and substitute parts are identified to provide procurement flexibility, accommodate supply chain variations, and support design standardization across manufacturing environments.

Substiute Parts

3404.0049.11

SCHURTER Inc.In Stock: 6773404.0049.11 Datasheet

Current PartRFQ

3404.0049.22

SCHURTER Inc.In Stock: 6803404.0049.22 Datasheet

SimilarRFQ

0451.125MRL

Littelfuse Inc.In Stock: 309340451.125MRL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 3404.0049.11 are qualified based on the following electrical and mechanical parameters:

• Current Rating: 125 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Fuse Type: Board Mount, Cartridge Style Excluded (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Packaging format (Bulk, Tape & Reel, Cut Tape) and package case style (J-Lead vs. Square End Block) are permitted variations within the substitute group, as these do not affect electrical performance or circuit protection function.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical and mechanical substitution criteria: 125 mA current rating, 125 V AC/DC voltage rating, fast-blow response, surface mount configuration, and ROHS3 compliance.

The SCHURTER 3404.0049.11 and 3404.0049.22 are functionally identical, differing only in packaging format (Bulk vs. Tape & Reel). Selection between these two SCHURTER variants depends on manufacturing process requirements and inventory management practices.

The Littelfuse 0451.125MRL (NANO²® 451 series) is electrically equivalent but features a Square End Block package case instead of J-Lead. This part carries dual certification (CSA and UL) compared to cURus certification on the SCHURTER variants. The breaking capacity is rated at 50A versus 100A for SCHURTER parts, and the melting I²t value is 0.00286 versus 0.0011 for SCHURTER parts. These differences do not affect substitutability for the specified 125 mA, 125 V application.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 3404.0049.22 directly replace SCHURTER 3404.0049.11 on the PCB?

A: Yes. Both parts are identical in electrical performance, current rating, voltage rating, response time, and physical dimensions. The only difference is packaging format (Bulk vs. Tape & Reel). PCB footprint and soldering requirements are identical.

Q: Is the Littelfuse 0451.125MRL compatible with the same PCB footprint?

A: The Littelfuse part uses a Square End Block package case versus the J-Lead configuration of SCHURTER parts. Physical dimensions differ: 0.240" L x 0.106" W x 0.106" H (Littelfuse) versus 0.291" L x 0.122" W x 0.102" H (SCHURTER). PCB footprint compatibility must be verified before substitution.

Q: What is the significance of the different breaking capacity ratings (100A vs. 50A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Both ratings exceed typical circuit protection requirements for 125 mA fuses. Selection should be based on actual circuit fault current levels and system design specifications.

Q: Are all three parts RoHS compliant?

A: Yes. All three parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: Which certifications apply to each part?

A: SCHURTER 3404.0049.11 and 3404.0049.22 carry cURus certification. Littelfuse 0451.125MRL carries CSA and UL certification. Certification selection depends on end-application regulatory requirements.