Littelfuse 0315.700H Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0315.700H is a 700 mA, 250 V AC/DC slow-blow glass cartridge fuse with 3AB/3AG package configuration and 1/4" x 1-1/4" axial dimensions. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing circuit protection applications. Active alternatives maintain identical electrical and mechanical specifications while offering improved compliance status and availability.

Substiute Parts

0315.700H

Littelfuse Inc.In Stock: 11520315.700H Datasheet

Current PartRFQ

0315.700HXP

Littelfuse Inc.In Stock: 12090315.700HXP Datasheet

DirectRFQ

0315.700MXP

Littelfuse Inc.In Stock: 11130315.700MXP Datasheet

Parametric EquivalentRFQ

0315.700VXP

Littelfuse Inc.In Stock: 8840315.700VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0315.700H are qualified based on strict electrical and mechanical parameter matching:

Qualifying Parameters for Substitution:

• Current Rating: 700 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Physical Dimensions: 0.275" Dia x 1.275" L (exact match required)

All three substitute parts—0315.700HXP, 0315.700MXP, and 0315.700VXP—meet these criteria and are direct functional equivalents to the obsolete 0315.700H.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—0315.700HXP, 0315.700MXP, and 0315.700VXP—are functionally equivalent to the obsolete 0315.700H and provide direct replacement capability. Selection among these active alternatives should be based on the following factors:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and supply chain continuity compared to the obsolete main part.

Compliance Certifications: All substitutes include CE certification in addition to CSA and UL approvals present on the main part, providing expanded regulatory coverage for international applications.

RoHS Compliance: All substitute parts are ROHS3 compliant, meeting current environmental and hazardous substance restrictions. The main part is RoHS non-compliant and should be replaced in new designs or applications requiring RoHS compliance.

DC Cold Resistance: Substitute parts exhibit 0.7 Ohms DC cold resistance compared to 0.695 Ohms on the main part. This minor variation (0.005 Ohms difference) is within acceptable tolerance for circuit protection applications and does not affect functional equivalence.

Inventory Availability: 0315.700HXP (1182 Pcs), 0315.700MXP (1060 Pcs), and 0315.700VXP (836 Pcs) all maintain active stock levels, with 0315.700HXP offering the highest current availability.

Frequently Asked Questions (FAQ)

Q: Can the 0315.700HXP, 0315.700MXP, or 0315.700VXP be used as direct replacements for the 0315.700H?

A: Yes. All three substitute parts are direct functional equivalents. They match the main part in current rating (700 mA), voltage rating (250 V AC), response time (slow blow), package configuration (3AB/3AG), physical dimensions (0.275" Dia x 1.275" L), and all other critical electrical and mechanical parameters.

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

A: The 0315.700HXP, 0315.700MXP, and 0315.700VXP are parametrically equivalent. All three share identical electrical specifications, package configuration, and approval certifications. Differences are limited to inventory levels and internal Littelfuse product line designations. Selection can be based on availability or internal procurement preferences.

Q: Why is the main part 0315.700H classified as obsolete?

A: The 0315.700H is obsolete and has been superseded by active alternatives. The substitute parts offer improved compliance status (ROHS3 compliant vs. RoHS non-compliant) and expanded certifications (CE, CSA, UL vs. CSA, UL only).

Q: Are there any compatibility concerns when substituting these parts?

A: No. The substitute parts are mechanically and electrically identical to the main part. They use the same 3AB/3AG package configuration, fit identical through-hole mounting positions, and operate within the same temperature range (-55°C to 125°C). No circuit modifications are required.

Q: What is the significance of the DC cold resistance difference (0.695 Ohms vs. 0.7 Ohms)?

A: The 0.005 Ohms difference in DC cold resistance between the main part and substitutes is negligible for circuit protection applications. This minor variation does not affect fuse performance, trip characteristics, or functional equivalence.

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

A: For new designs, any of the three active substitute parts is acceptable. However, designs requiring RoHS compliance must use one of the substitute parts, as the main part is RoHS non-compliant. Selection among substitutes can be based on availability, internal part numbering conventions, or procurement preferences.