MRPR-3-32-38 Equivalent & Substitute Parts

Part Overview

The MRPR-3-32-38 is a glass body reed switch manufactured by Littelfuse, configured as a single-pole single-throw normally open (SPST-NO) device. This component is rated for 1.1A AC / 1.5A DC switching at 140V AC and 200V DC, with a 50W power rating and an operating range of 32–38AT. The part is mounted through-hole with axial termination and operates across a temperature range of -40°C to 125°C.

The MRPR-3-32-38 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

MRPR-3-32-38

LittelfuseIn Stock: 909MRPR-3-32-38 Datasheet

Current PartRFQ

MRPR-20-32-38

Littelfuse Inc.In Stock: 937MRPR-20-32-38 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MRPR-3-32-38 is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO
• Operate Range: Must be 32–38AT
• Current Rating: Must support minimum 1.1A (AC) and 1.5A (DC)
• Voltage Rating: Must support minimum 140V AC and 200V DC
• Power Rating: Must support minimum 50W
• Mounting and Termination: Must be through-hole with axial termination
• Operating Temperature: Must encompass or exceed -40°C to 125°C
• Compliance: Must maintain ROHS3 compliance

The MRPR-20-32-38 meets all substitution criteria. It maintains identical circuit configuration, operate range, current ratings, power rating, mounting type, and termination style. The MRPR-20-32-38 exceeds the voltage and temperature specifications of the original part, making it a direct functional substitute. The primary distinction is product status: MRPR-20-32-38 is active production, whereas MRPR-3-32-38 is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The MRPR-20-32-38 is the direct substitute for the obsolete MRPR-3-32-38. Both components are manufactured by Littelfuse and maintain identical electrical and mechanical specifications for switching current, power rating, operate and release times, and physical dimensions.

The MRPR-20-32-38 provides enhanced voltage ratings (265V AC / 250V DC versus 140V AC / 200V DC) and maintains full ROHS3 compliance. The active production status of MRPR-20-32-38 ensures long-term component availability and supply chain continuity.

For applications requiring the original -40°C lower temperature limit, verify that the MRPR-20-32-38 operating range of -20°C to 125°C meets system requirements. In all other electrical and mechanical aspects, the MRPR-20-32-38 is functionally equivalent and directly interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the MRPR-20-32-38 be used as a direct replacement for the MRPR-3-32-38?

A: Yes. Both components share identical circuit configuration (SPST-NO), operate range (32–38AT), switching current ratings (1.1A AC / 1.5A DC), power rating (50W), operate and release times, mounting type (through-hole), termination style (axial), and physical dimensions. The MRPR-20-32-38 exceeds the voltage specifications of the original part.

Q: What are the key differences between these two parts?

A: The MRPR-3-32-38 is obsolete; the MRPR-20-32-38 is in active production. The MRPR-20-32-38 has higher voltage ratings (265V AC / 250V DC versus 140V AC / 200V DC) and a higher minimum operating temperature (-20°C versus -40°C). All other parameters are identical.

Q: Are there any compatibility concerns with PCB layout or footprint?

A: No. Both components have identical overall length (2.230" / 56.64mm), body dimensions, and axial termination style. PCB layouts designed for the MRPR-3-32-38 accommodate the MRPR-20-32-38 without modification.

Q: Does the MRPR-20-32-38 meet the same compliance standards?

A: Yes. The MRPR-20-32-38 is ROHS3 compliant, maintains MSL 1 (Unlimited) moisture sensitivity rating, and carries the same ECCN (EAR99) classification as the original part.

Q: What should be verified before substitution in low-temperature applications?

A: The MRPR-20-32-38 operates down to -20°C, whereas the MRPR-3-32-38 operates to -40°C. Applications requiring operation below -20°C must confirm that the MRPR-20-32-38 meets system temperature requirements.