MARR-5-27-33 Equivalent & Substitute Parts

Part Overview

The MARR-5-27-33 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 27–33AT operate range. The part is classified as obsolete, making identification of active equivalent models essential for ongoing procurement and system maintenance.

Substiute Parts

MARR-5-27-33

Littelfuse Inc.In Stock: 1104MARR-5-27-33 Datasheet

Current PartRFQ

MVSR-20-27-33

LittelfuseIn Stock: 984MVSR-20-27-33 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MVSR-20-27-33 qualifies as a direct substitute for the MARR-5-27-33 based on the following critical parameters:

• Circuit Configuration: Both parts are SPST-NO reed switches
• Operate Range: Identical 27–33AT specification
• Current Ratings: Matching 350mA AC / 500mA DC switching capacity
• Voltage Ratings: Identical 265V AC and 1000V DC switching voltages
• Power Rating: Both rated at 10W
• Switching Times: Identical 0.75ms operate time and 0.3ms release time
• Physical Dimensions: Matching overall length (2.235" / 56.77mm) and body size (0.105" Dia × 0.775" L)
• Temperature Range: Identical −75°C to 125°C operating window
• Electrical Properties: Matching 0.2pF capacitance and 1.3A DC carry current
• Compliance: Both ROHS3 compliant with MSL 1 rating

The MVSR-20-27-33 is an active product from the same manufacturer, providing functional and mechanical equivalence with improved availability.

Parameter Comparison

Engineering Selection Recommendations

The MVSR-20-27-33 is the appropriate selection for applications currently specified with the MARR-5-27-33. All electrical, mechanical, and thermal parameters are identical. The MVSR-20-27-33 carries active product status from Littelfuse Inc., ensuring ongoing availability and supply chain continuity. Both parts maintain ROHS3 compliance and MSL 1 rating, satisfying regulatory and environmental requirements. The transition from the obsolete MARR-5 series to the active MVSR-20 series presents no functional or compatibility constraints for through-hole PCB assembly applications.

Frequently Asked Questions (FAQ)

Q: Can the MVSR-20-27-33 be used as a direct replacement for the MARR-5-27-33?

A: Yes. All critical electrical parameters (switching current, voltage ratings, power capacity, operate/release times), mechanical dimensions (overall length, body diameter), and thermal specifications are identical. Both are glass body SPST-NO reed switches with 27–33AT operate range and through-hole axial termination.

Q: What is the primary reason to transition from MARR-5-27-33 to MVSR-20-27-33?

A: The MARR-5-27-33 is classified as obsolete. The MVSR-20-27-33 is an active product from the same manufacturer, providing equivalent functionality with assured long-term availability.

Q: Are there any differences in PCB footprint or mounting between these parts?

A: No. Both parts share identical overall length (2.235" / 56.77mm), body dimensions (0.105" Dia × 0.775" L), and through-hole axial termination style. PCB layout and assembly procedures remain unchanged.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MARR-5-27-33 and MVSR-20-27-33 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What switching capacity should be verified for my application?

A: Confirm that your application does not exceed 350mA AC or 500mA DC switching current, and operates within 265V AC or 1000V DC switching voltage limits. Both parts are rated for 10W maximum power dissipation.

Q: Are there any temperature or environmental constraints?

A: Both parts operate across −75°C to 125°C. Verify that your application environment falls within this range and that MSL 1 storage and handling requirements are met.