Littelfuse 831/835 Cartridge Fuse Holder 6.3A 250V - Equivalent & Substitute Parts

Part Overview

The Littelfuse 831/835 is a through-hole mounted cartridge fuse holder rated for 6.3 A at 250V, designed for single-circuit PCB applications using 5mm x 20mm fuse cartridges. This product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

Substiute Parts

831/835

Littelfuse Inc.In Stock: 1175831/835 Datasheet

Current PartRFQ

3101.0045

SCHURTER Inc.In Stock: 11253101.0045 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 831/835 is determined by the following critical parameters:

• Fuse Size Compatibility: Substitute must accept 5mm x 20mm cartridge fuses
• Mounting Configuration: Through-hole mounting with vertical orientation and PC pin termination
• Circuit Count: Single-circuit design
• Contact Materials & Finish: Copper alloy with tin finish for electrical compatibility
• Mechanical Fit: Identical footprint and pin spacing for direct PCB replacement

The SCHURTER 3101.0045 qualifies as a substitute based on matching all mechanical and interface parameters. While the SCHURTER part features higher electrical ratings (16A at 500V versus 6.3A at 250V), these represent design margins that do not prevent substitution in applications requiring the original 6.3A/250V performance envelope.

Parameter Comparison

Engineering Selection Recommendations

The SCHURTER 3101.0045 is the designated manufacturer-recommended substitute for the Littelfuse 831/835. Selection of this alternative is supported by:

• Active Product Status: The SCHURTER part maintains active production status, ensuring long-term availability and supply chain continuity
• RoHS3 Compliance: The substitute meets ROHS3 requirements, addressing regulatory compliance gaps present in the obsolete Littelfuse design
• Mechanical Compatibility: Identical fuse cartridge size, mounting footprint, and termination configuration enable direct PCB replacement without layout modification
• Electrical Margin: Higher current and voltage ratings provide design margin while remaining compatible with applications specified for 6.3A/250V operation

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 3101.0045 be used as a direct replacement on existing PCBs designed for the Littelfuse 831/835?

A: Yes. Both parts share identical mechanical dimensions, fuse cartridge size (5mm x 20mm), mounting type (through-hole vertical), and PC pin termination. No PCB layout modification is required.

Q: Why does the substitute have higher current and voltage ratings?

A: The SCHURTER 3101.0045 is rated for 16A at 500V, compared to the original 6.3A at 250V. These higher ratings do not prevent substitution in applications requiring the original specifications. The substitute will operate safely within the lower electrical envelope of the original design.

Q: Are there compatibility concerns with fuse cartridges?

A: No. Both the Littelfuse 831/835 and SCHURTER 3101.0045 accept standard 5mm x 20mm cartridge fuses. Fuse selection should be based on the application's actual current and voltage requirements, not the holder's maximum ratings.

Q: What is the significance of the RoHS compliance difference?

A: The Littelfuse 831/835 is RoHS non-compliant, while the SCHURTER 3101.0045 is ROHS3 compliant. For new designs or applications subject to RoHS regulations, the SCHURTER substitute is the appropriate choice.

Q: Is the SCHURTER part available in the same packaging as the original?

A: The SCHURTER 3101.0045 is supplied in bulk packaging, whereas the original Littelfuse part packaging specification was not provided. Confirm packaging requirements with your procurement process.