MRPR-3-22-28 Equivalent & Substitute Parts

Part Overview

The MRPR-3-22-28 is a glass body reed switch manufactured by Littelfuse, configured as SPST-NO (Single Pole Single Throw - Normally Open) with a switching capacity of 1.1A AC and 1.5A DC at 140V AC / 200V DC. This component is rated for 50W power dissipation with an operate range of 22–28AT and is designed for through-hole mounting applications. The product is currently obsolete, making identification of compatible alternatives essential for ongoing system support and component procurement.

Substiute Parts

MRPR-3-22-28

LittelfuseIn Stock: 820MRPR-3-22-28 Datasheet

Current PartRFQ

MRPR-20-22-28

Littelfuse Inc.In Stock: 1944MRPR-20-22-28 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MRPR-20-22-28 qualifies as a direct substitute for the MRPR-3-22-28 based on the following critical parameters:

• Circuit Configuration: Both parts are SPST-NO reed switches with identical switching behavior
• Operate Range: Both maintain the 22–28AT operate range, ensuring equivalent magnetic sensitivity
• Switching Current: Both support 1.1A AC and 1.5A DC switching capacity
• Power Rating: Both are rated for 50W power dissipation
• Timing Characteristics: Both exhibit 0.75 ms operate time and 0.3 ms release time
• Mounting and Termination: Both use through-hole mounting with axial termination
• Physical Dimensions: Overall length is identical at 2.230" (56.64mm); body diameter is 0.112" (2.84mm) for both
• Environmental Compliance: Both are ROHS3 compliant with MSL 1 rating
• Operating Temperature: Both support -20°C to 125°C range (MRPR-20-22-28 has a higher minimum temperature of -20°C versus -40°C for MRPR-3-22-28)

The primary difference is voltage rating: MRPR-20-22-28 supports 265V AC / 250V DC versus 140V AC / 200V DC for MRPR-3-22-28. This represents an upgrade in voltage capability.

Parameter Comparison

Engineering Selection Recommendations

The MRPR-20-22-28 is the designated substitute for the obsolete MRPR-3-22-28. Selection of this alternative is supported by:

• Active Product Status: MRPR-20-22-28 is currently in active production, ensuring long-term availability and supply chain continuity
• Functional Equivalence: Identical circuit configuration, switching current, power rating, timing characteristics, and mounting specifications ensure drop-in compatibility in applications designed for MRPR-3-22-28
• Enhanced Voltage Rating: The higher voltage capability (265V AC / 250V DC versus 140V AC / 200V DC) provides margin for applications operating at or near the original part's voltage limits
• Regulatory Compliance: Both parts maintain ROHS3 compliance and identical environmental ratings (MSL 1, EAR99 classification)
• Minimal Physical Variation: Body diameter and overall length are identical; body length difference of 0.025" (0.63mm) is negligible for through-hole mounting applications

Applications operating below 140V AC or 200V DC can substitute MRPR-20-22-28 without functional impact. Applications requiring operation at temperatures below -20°C should evaluate the reduced minimum operating temperature of MRPR-20-22-28 (-20°C versus -40°C for the original part).

Frequently Asked Questions (FAQ)

Q: Can MRPR-20-22-28 be used as a direct replacement for MRPR-3-22-28 in existing designs?

A: Yes. Both parts share identical circuit configuration (SPST-NO), switching current (1.1A AC / 1.5A DC), power rating (50W), operate range (22–28AT), timing characteristics (0.75 ms operate / 0.3 ms release), and through-hole axial termination. Physical dimensions are effectively identical for PCB mounting purposes.

Q: What is the primary difference between these two parts?

A: The MRPR-20-22-28 has a higher voltage rating (265V AC / 250V DC) compared to the MRPR-3-22-28 (140V AC / 200V DC). The MRPR-20-22-28 also has a higher minimum operating temperature (-20°C versus -40°C).

Q: Is the voltage upgrade from 140V to 265V AC a concern for existing applications?

A: No. Higher voltage rating does not negatively impact applications designed for lower voltages. The substitute part will function identically in circuits operating at or below the original voltage specifications.

Q: Are there packaging differences between these parts?

A: The MRPR-3-22-28 packaging information is not specified in available data. The MRPR-20-22-28 is supplied in bulk packaging. Confirm packaging requirements with your procurement department.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both MRPR-3-22-28 and MRPR-20-22-28 are ROHS3 compliant with MSL 1 rating and EAR99 classification.

Q: What is the body size difference between these parts?

A: Body length differs by 0.025" (0.63mm): MRPR-3-22-28 is 0.775" L (19.69mm) and MRPR-20-22-28 is 0.800" L (20.32mm). This minimal difference does not affect through-hole mounting compatibility.

Q: Can MRPR-20-22-28 be used in applications requiring -40°C operation?

A: The MRPR-20-22-28 minimum operating temperature is -20°C. Applications requiring -40°C operation should verify that the reduced temperature range is acceptable for the intended use case.