Littelfuse 0325.031H Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325.031H is a 31 mA, 250 V AC/DC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 3AB and 3AG package formats. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Active alternatives maintain identical electrical and mechanical specifications while offering improved compliance status and extended operating temperature ranges.

Substiute Parts

0325.031H

LittelfuseIn Stock: 11170325.031H Datasheet

Current PartRFQ

0325.031HXP

Littelfuse Inc.In Stock: 11470325.031HXP Datasheet

DirectRFQ

0325.031MXP

LittelfuseIn Stock: 7920325.031MXP Datasheet

Parametric EquivalentRFQ

0325.031VXP

Littelfuse Inc.In Stock: 10740325.031VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0325.031H is based on strict equivalence across all critical electrical and mechanical parameters. The substitute parts 0325.031HXP, 0325.031MXP, and 0325.031VXP are classified as direct manufacturer equivalents because they maintain identical specifications in the following key areas:

• Current rating: 31 mA
• Voltage rating: 250 V AC
• Fuse type and response time: Ceramic, slow-blow
• Package and case designation: 3AB, 3AG, 1/4" x 1-1/4" (Axial)
• Breaking capacity: 100 A at rated voltage
• Melting I²t: 0.011
• Physical dimensions: 0.275" Dia x 1.288" L (6.99mm x 32.72mm)

All substitute parts are manufactured by Littelfuse Inc. and carry active product status, distinguishing them from the obsolete main part.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (0325.031HXP, 0325.031MXP, and 0325.031VXP) are electrically and mechanically equivalent to the 0325.031H and are suitable for direct replacement in applications requiring a 31 mA, 250 V AC ceramic slow-blow fuse in 3AB/3AG package format.

The substitute parts offer the following advantages over the obsolete main part:

• Active product status ensures continued availability and supply chain reliability
• ROHS3 compliance and CE approval certifications meet current regulatory requirements
• Specified operating temperature range of -55°C to 125°C provides documented thermal performance
• REACH unaffected status confirms compliance with chemical substance regulations
• Bulk packaging availability supports production and inventory management

Selection among the three substitute parts may be based on packaging preferences, inventory availability, or supply chain considerations, as all three maintain identical electrical and mechanical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0325.031HXP, 0325.031MXP, or 0325.031VXP be used as direct replacements for the obsolete 0325.031H?

A: Yes. All three substitute parts maintain identical current rating (31 mA), voltage rating (250 V AC), fuse type (ceramic, slow-blow), package designation (3AB, 3AG), breaking capacity (100 A), and physical dimensions (0.275" Dia x 1.288" L). They are electrically and mechanically equivalent and suitable for direct substitution.

Q: What is the difference between the three substitute parts?

A: The 0325.031HXP, 0325.031MXP, and 0325.031VXP are parametrically equivalent. Differences are limited to packaging format (all bulk) and inventory availability. All three carry identical electrical specifications, compliance certifications, and operating temperature ranges.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0325.031HXP, 0325.031MXP, and 0325.031VXP) are ROHS3 compliant, whereas the original 0325.031H is RoHS non-compliant. This makes the substitutes suitable for applications requiring RoHS compliance.

Q: What is the operating temperature range for the substitute parts?

A: The substitute parts are rated for operation from -55°C to 125°C. The original 0325.031H does not specify an operating temperature range.

Q: Do the substitute parts have regulatory approvals?

A: Yes. All three substitute parts carry CE approval and are REACH unaffected, confirming compliance with European regulatory requirements and chemical substance regulations.

Q: Is there a difference in DC cold resistance between the main part and substitutes?

A: The 0325.031H has a DC cold resistance of 330 Ohms, while all three substitute parts have a DC cold resistance of 332.5 Ohms. This minor difference (0.76% variation) does not affect functional equivalence for fuse applications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The substitute parts are mechanically and electrically equivalent to the 0325.031H. They use the same 3AB/3AG package format and through-hole mounting configuration, allowing direct substitution in existing PCB designs and fuse holders without modification.