MDA-V-1/2-R Equivalent & Substitute Parts

Part Overview

The MDA-V-1/2-R is a 500 mA ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated for 250 V AC operation with slow-blow response characteristics. This fuse is designed for through-hole mounting in 3AB, 3AG form factor (1/4" x 1-1/4" axial configuration). The part maintains active product status and is RoHS3 compliant with CE, CSA, and UL approvals. Substitute parts are identified to support circuit protection applications where the original part may be unavailable or where equivalent electrical and mechanical specifications are required.

Substiute Parts

MDA-V-1/2-R

Eaton - Electronics DivisionIn Stock: 948MDA-V-1/2-R Datasheet

Current PartRFQ

0325.500HXP

Littelfuse Inc.In Stock: 12240325.500HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MDA-V-1/2-R is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

• Current Rating: 500 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)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)

The substitute part 0325.500HXP from Littelfuse Inc. meets all critical matching parameters. Additional electrical characteristics such as breaking capacity, melting I²t, and DC cold resistance may vary within acceptable engineering tolerances for the fuse category, provided the AC voltage rating and current rating remain identical. Dimensional tolerances within the 3AB, 3AG standard are acceptable for through-hole mounting compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the MDA-V-1/2-R and 0325.500HXP maintain active product status and carry identical regulatory approvals (CE, CSA, UL). Both parts are RoHS3 compliant, meeting environmental compliance requirements for electronic component applications.

The 0325.500HXP substitute provides additional DC voltage rating (125 V DC) not specified in the MDA-V-1/2-R datasheet. This extended DC rating does not compromise AC circuit protection performance and may provide operational flexibility in mixed AC/DC applications.

Dimensional variation between the two parts (0.266" vs. 0.275" diameter; 1.292" vs. 1.288" length) falls within standard 3AB, 3AG tolerance ranges and does not affect through-hole mounting compatibility or electrical performance in standard fuse holders.

Selection between these parts should be based on availability, supply chain requirements, and any application-specific constraints related to breaking capacity or melting I²t characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0325.500HXP directly replace the MDA-V-1/2-R in existing circuits?

A: Yes. Both parts share identical current rating (500 mA), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (slow blow), and package configuration (3AB, 3AG, 1/4" x 1-1/4" axial). Through-hole mounting compatibility is maintained within standard dimensional tolerances.

Q: What is the significance of the DC voltage rating difference?

A: The MDA-V-1/2-R does not specify a DC voltage rating, while the 0325.500HXP is rated for 125 V DC. In AC-only applications, this difference is not relevant. In circuits with DC components, the 0325.500HXP provides documented DC protection capability.

Q: Are there dimensional concerns with the substitute part?

A: Dimensional differences (0.009" diameter increase, 0.004" length decrease) are within 3AB, 3AG standard tolerances. These variations do not affect mounting in standard fuse holders or electrical performance.

Q: Do both parts carry the same regulatory approvals?

A: Yes. Both the MDA-V-1/2-R and 0325.500HXP carry CE, CSA, and UL approvals and are RoHS3 compliant.

Q: What is the difference in breaking capacity between these parts?

A: The MDA-V-1/2-R has a breaking capacity of 35A at rated voltage. The 0325.500HXP has 100A AC and 10kA DC breaking capacity. Higher breaking capacity indicates greater ability to safely interrupt fault currents without component damage.

Q: How do melting I²t values affect substitution?

A: Melting I²t (1.2 for MDA-V-1/2-R vs. 2.5 for 0325.500HXP) indicates thermal energy required to melt the fuse element. The MDA-V-1/2-R melts at lower energy levels, providing faster response in some fault conditions. The 0325.500HXP requires higher energy, which may affect response time in specific circuit topologies. Application requirements determine which characteristic is appropriate.

Q: Is the operating temperature range important for substitution?

A: The 0325.500HXP specifies -55°C ~ 125°C operating temperature. The MDA-V-1/2-R does not specify this parameter. If the application requires operation outside standard ambient conditions, the documented temperature range of the 0325.500HXP should be evaluated against circuit requirements.