Littelfuse 0326.375H Ceramic Cartridge Fuse – Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326.375H is a 375 mA, 250 V AC ceramic cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder applications. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and new design implementations. Substitute parts must maintain identical current ratings, voltage specifications, physical dimensions, and holder compatibility while meeting modern compliance standards.

Substiute Parts

0326.375H

Littelfuse Inc.In Stock: 9150326.375H Datasheet

Current PartRFQ

0326.375HXP

Littelfuse Inc.In Stock: 7720326.375HXP Datasheet

DirectRFQ

0326.375MXP

Littelfuse Inc.In Stock: 7840326.375MXP Datasheet

Parametric EquivalentRFQ

0326.375VXP

LittelfuseIn Stock: 9670326.375VXP Datasheet

Parametric EquivalentRFQ

MDA-3/8-R

Eaton - Electronics DivisionIn Stock: 683MDA-3/8-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating – AC: 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)
• Holder Compatibility: 3AB, 3AG (exact match required)

All identified substitute parts meet these core electrical and mechanical criteria. Additional parameters such as DC voltage rating, operating temperature range, and RoHS compliance status are provided for system-level design considerations but do not disqualify substitution eligibility when the primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts satisfy the core electrical and mechanical substitution criteria for the obsolete 0326.375H. Selection among active alternatives should be based on the following considerations:

Littelfuse 0326.375HXP, 0326.375MXP, and 0326.375VXP are direct Littelfuse equivalents with identical melting I²t values (1.2), matching DC cold resistance specifications (2.155 Ohms), and expanded approval certifications including CE compliance. These parts are active products with extended operating temperature ranges (-55°C ~ 125°C) and DC voltage ratings (125 V), providing enhanced system flexibility. All three carry ROHS3 compliance and REACH unaffected status.

Eaton MDA-3/8-R is a parametric equivalent from an alternative manufacturer. This part maintains the required 375 mA current rating, 250 V AC voltage, and identical physical dimensions. The MDA-3/8-R exhibits a lower melting I²t value (0.64 versus 1.2) and higher DC cold resistance (4.5 Ohms versus 2.155 Ohms), which may affect thermal response characteristics in specific circuit applications. This part is active and ROHS3 compliant with full CE, CSA, and UL approvals.

For direct replacement in existing designs, Littelfuse 0326.375HXP, 0326.375MXP, or 0326.375VXP are preferred due to parametric alignment. For multi-source supply chain strategies, the Eaton MDA-3/8-R provides an alternative from a different manufacturer, subject to circuit-level thermal analysis validation.

Frequently Asked Questions (FAQ)

Q: Can the 0326.375HXP, 0326.375MXP, and 0326.375VXP be used interchangeably with the obsolete 0326.375H?

A: Yes. All three parts maintain identical current ratings (375 mA), AC voltage ratings (250 V), fuse type (ceramic cartridge), response time (slow blow), and physical dimensions (0.250" Dia x 1.250" L). They are compatible with 3AB and 3AG holders. The primary advantage is active product status and modern compliance certifications (CE, ROHS3).

Q: What is the difference between the Littelfuse 0326.375HXP, 0326.375MXP, and 0326.375VXP variants?

A: These three parts are parametrically identical across all electrical and mechanical specifications. Differences are limited to packaging format and inventory availability. Selection among them is based on procurement and supply chain requirements rather than technical performance.

Q: Is the Eaton MDA-3/8-R a suitable replacement for the 0326.375H?

A: The Eaton MDA-3/8-R meets the core substitution criteria: 375 mA current rating, 250 V AC voltage, ceramic cartridge type, slow-blow response, and 3AB/3AG holder compatibility. However, the MDA-3/8-R exhibits a lower melting I²t (0.64 versus 1.2) and higher DC cold resistance (4.5 Ohms versus 2.155 Ohms). Circuit-level thermal analysis is required to confirm suitability in applications where these parameters influence system behavior.

Q: Why do the Littelfuse substitutes include DC voltage ratings when the original 0326.375H does not?

A: The 0326.375HXP, 0326.375MXP, and 0326.375VXP are rated for both AC and DC operation (250 V AC, 125 V DC), providing expanded application flexibility. The original 0326.375H specification does not include a DC rating. Systems operating exclusively in AC mode are unaffected by this difference.

Q: Are all substitute parts RoHS compliant?

A: The original 0326.375H is RoHS non-compliant. All four substitute parts (0326.375HXP, 0326.375MXP, 0326.375VXP, and MDA-3/8-R) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and manufacturing.

Q: What approval certifications apply to these fuses?

A: The original 0326.375H carries CSA and UL approvals. All substitute parts carry CE, CSA, and UL certifications, providing broader regulatory coverage for global applications.