MARR-5-12-18 Equivalent & Substitute Parts

Part Overview

The MARR-5-12-18 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This component is rated for 350mA AC / 500mA DC switching at 265V AC and 1000V DC, with a 10W power rating and 12–18AT operate range. The part is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

MARR-5-12-18

Littelfuse Inc.In Stock: 928MARR-5-12-18 Datasheet

Current PartRFQ

MVSR-20-12-18

Littelfuse Inc.In Stock: 824MVSR-20-12-18 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MVSR-20-12-18 qualifies as a direct substitute for the MARR-5-12-18 based on the following critical electrical and mechanical parameters:

Matching Parameters:

• Circuit configuration: SPST-NO
• Operate range: 12–18AT
• Current switching ratings: 350mA (AC), 500mA (DC)
• Voltage ratings: 265V AC, 1000V DC
• Power rating: 10W
• Operating temperature range: -75°C to 125°C
• Mounting type: Through Hole
• Termination style: Axial
• Physical dimensions: 2.235" overall length, 0.105" diameter body
• Capacitance: 0.2 pF
• Current carry capacity: 1.3A (DC)
• RoHS compliance: ROHS3 Compliant
• MSL rating: 1 (Unlimited)

The MVSR-20-12-18 maintains identical electrical performance and mechanical compatibility while offering active product status and current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

The MVSR-20-12-18 is the appropriate selection for applications currently using or specifying the MARR-5-12-18. Both components are manufactured by Littelfuse Inc. and maintain identical electrical and mechanical specifications across all critical parameters. The MVSR-20-12-18 offers the advantage of active product status, ensuring continued availability and manufacturing support. Both parts carry ROHS3 compliance and MSL 1 rating, meeting environmental and reliability standards. The transition from MARR-5 series to MVSR-20 series represents a standard product line evolution within the Littelfuse reed switch portfolio, with no functional or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the MVSR-20-12-18 be used as a direct replacement for the MARR-5-12-18 in existing designs?

A: Yes. The MVSR-20-12-18 is electrically and mechanically identical to the MARR-5-12-18 across all specified parameters, including switching current, voltage ratings, operate range, temperature range, and physical dimensions. No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The MARR-5-12-18 is classified as obsolete. The MVSR-20-12-18 is an active equivalent that provides continued supply chain availability and manufacturing support.

Q: Are the physical dimensions identical?

A: Yes. Both components have an overall length of 2.235" (56.77mm), body diameter of 0.105" (2.66mm), and body length of 0.775" (19.69mm). Through-hole mounting and axial termination are identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MARR-5-12-18 and MVSR-20-12-18 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the packaging difference?

A: The MVSR-20-12-18 is supplied in box packaging. Packaging format does not affect electrical or mechanical performance.

Q: Are the switching characteristics identical?

A: Yes. Both components have identical operate time (0.75 ms), release time (0.3 ms), and switching current/voltage ratings for AC and DC applications.