Littelfuse 0234005.M Ceramic Fuse 5A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0234005.M is a 5A 250VAC ceramic cartridge fuse in 5x20mm form factor, designed for general-purpose circuit protection applications requiring a medium-blow response characteristic. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing procurement and system maintenance. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional compatibility within defined parameter tolerances.

Substiute Parts

0234005.M

LittelfuseIn Stock: 11860234005.M Datasheet

Current PartRFQ

0234005.MXBP

Littelfuse Inc.In Stock: 13050234005.MXBP Datasheet

Parametric EquivalentRFQ

0234005.MXP

Littelfuse Inc.In Stock: 76000234005.MXP Datasheet

Parametric EquivalentRFQ

0034.2523

SCHURTER Inc.In Stock: 53180034.2523 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0234005.M is determined by strict equivalence across the following critical parameters: current rating (5A), AC voltage rating (250V), fuse type (cartridge ceramic), physical dimensions (5x20mm), response characteristic (medium blow), and mounting requirement (holder-based installation). All identified substitutes maintain these core specifications, ensuring direct functional replacement without circuit redesign or holder modification.

The substitute parts are grouped into two categories based on manufacturer and product status:

Category 1: Littelfuse Active Equivalents — Parts 0234005.MXBP and 0234005.MXP represent active production variants of the original 0234005.M specification, differing only in packaging configuration (bulk) and enhanced compliance certifications.

Category 2: Cross-Manufacturer Equivalent — Part 0034.2523 (SCHURTER) provides functional equivalence with identical electrical ratings and mechanical form factor, though with different DC voltage capability and breaking capacity specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Littelfuse 0234005.MXBP and 0234005.MXP): These parts are recommended as direct replacements for the obsolete 0234005.M. Both maintain identical electrical specifications and mechanical form factor while offering active product status and enhanced compliance certifications (ROHS3, CE, PSE). The 0234005.MXP variant offers superior inventory availability (7567 units) compared to 0234005.MXBP (1238 units). Both parts are suitable for applications requiring RoHS3 compliance and extended operating temperature ranges (-55°C to 125°C).

Secondary Substitute (SCHURTER 0034.2523): This cross-manufacturer equivalent provides functional compatibility for AC-rated applications. The part maintains identical current, AC voltage, and mechanical specifications. However, the SCHURTER part exhibits a higher melting I²t value (52.5 versus 20.645), indicating a slower thermal response. This characteristic may affect nuisance trip behavior in circuits with transient current conditions. The SCHURTER part is suitable only for applications where the higher I²t value does not compromise circuit protection objectives. DC applications requiring voltage ratings above 125V cannot use this substitute.

Compliance Considerations: Applications requiring RoHS3 compliance must use 0234005.MXBP, 0234005.MXP, or 0034.2523. The original 0234005.M is RoHS non-compliant and unsuitable for new designs or regulated environments.

Frequently Asked Questions (FAQ)

Q: Can 0234005.MXBP and 0234005.MXP be used interchangeably with 0234005.M?

A: Yes. Both parts maintain identical electrical ratings (5A, 250VAC), fuse type (ceramic cartridge), physical dimensions (5x20mm), and response characteristic (medium blow). The primary differences are packaging configuration (bulk versus original) and enhanced certifications. Both are direct functional replacements.

Q: What is the difference between 0234005.MXBP and 0234005.MXP?

A: Both parts are electrically and mechanically identical. The distinction is packaging and inventory availability. 0234005.MXP has significantly higher stock (7567 units) compared to 0234005.MXBP (1238 units). Selection should be based on procurement lead time and packaging requirements.

Q: Can the SCHURTER 0034.2523 replace the Littelfuse 0234005.M in all applications?

A: The SCHURTER part is functionally equivalent for AC-rated circuits. However, the higher melting I²t value (52.5 versus 21.2) results in slower thermal response. This may cause delayed protection in circuits sensitive to transient overcurrent conditions. Verify circuit protection requirements before substitution. DC applications cannot use this part if DC voltage exceeds 125V.

Q: Are all substitute parts compatible with existing fuse holders?

A: Yes. All substitute parts maintain the 5x20mm form factor and require holder-based mounting, identical to the original 0234005.M. No holder modification or replacement is necessary.

Q: Which substitute part should be selected for new designs?

A: For new designs, select either 0234005.MXBP or 0234005.MXP (Littelfuse active equivalents). Both offer RoHS3 compliance, extended operating temperature ranges, and active production status. The 0234005.MXP variant is preferred due to superior inventory availability.

Q: What is the significance of the melting I²t parameter in substitute selection?

A: The melting I²t value determines the thermal energy required to melt the fuse element. Lower I²t values (0234005.M: 21.2, Littelfuse equivalents: 20.645) indicate faster response to overcurrent. The SCHURTER part (52.5) responds more slowly. In circuits with sensitive loads or strict protection requirements, the faster-responding Littelfuse parts are preferred.

Q: Are the Littelfuse substitutes suitable for applications requiring RoHS compliance?

A: Yes. Both 0234005.MXBP and 0234005.MXP are ROHS3 compliant. The original 0234005.M is RoHS non-compliant and cannot be used in regulated environments requiring RoHS certification.