MRPR-8-22-33 Equivalent & Substitute Parts

Part Overview

The MRPR-8-22-33 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This through-hole component is rated for 700mA AC / 1A DC switching at 265V AC and 250V DC, with a 50W power rating. The product is currently obsolete, necessitating identification of functionally compatible alternatives for ongoing system support and new designs requiring equivalent switching performance.

Substiute Parts

MRPR-8-22-33

Littelfuse Inc.In Stock: 1007MRPR-8-22-33 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-8-22-33 based on the following critical parameters:

Matching Parameters:

• Circuit configuration: SPST-NO (identical switching topology)
• Voltage ratings: 265V AC / 250V DC (identical electrical stress limits)
• Power rating: 50W (identical power dissipation capability)
• Mounting type: Through Hole (identical PCB integration method)
• Termination style: Axial (identical lead configuration)
• Operating temperature range: -20°C ~ 125°C (identical thermal operating window)
• Physical dimensions: 2.230" overall length, 0.112" diameter body (identical form factor)
• Timing characteristics: 0.75ms operate time, 0.3ms release time (identical switching speed)
• Capacitance: 0.2pF (identical parasitic characteristics)
• RoHS compliance: ROHS3 Compliant (identical regulatory status)

Differentiation: The MRPR-20-22-28 operates within a tighter actuation range (22 ~ 28AT versus 22 ~ 33AT) and provides higher switching current capacity (1.1A AC / 1.5A DC versus 700mA AC / 1A DC). These characteristics make the MRPR-20-22-28 suitable for applications requiring the MRPR-8-22-33's electrical and mechanical specifications, with enhanced current handling capability.

Parameter Comparison

Engineering Selection Recommendations

The MRPR-20-22-28 is the designated substitute for the obsolete MRPR-8-22-33. Selection is based on:

Product Status: The MRPR-20-22-28 maintains Active product status, ensuring ongoing availability and manufacturer support, whereas the MRPR-8-22-33 is Obsolete.

Regulatory Compliance: Both components maintain ROHS3 compliance. The MRPR-20-22-28 additionally carries REACH Unaffected status, providing extended regulatory coverage.

Electrical Compatibility: The MRPR-20-22-28 operates within identical voltage and power parameters (265V AC / 250V DC, 50W), with enhanced current-switching capacity (1.1A AC / 1.5A DC) compared to the MRPR-8-22-33 (700mA AC / 1A DC). This increased capacity provides design margin without compromising compatibility.

Physical and Functional Equivalence: Identical mounting type (Through Hole), termination style (Axial), physical dimensions, and switching timing ensure direct PCB integration without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the MRPR-20-22-28 directly replace the MRPR-8-22-33 in existing designs?

A: Yes. The MRPR-20-22-28 maintains identical circuit configuration (SPST-NO), voltage ratings (265V AC / 250V DC), power rating (50W), mounting type (Through Hole), termination style (Axial), and physical dimensions. No PCB layout changes are required.

Q: What is the difference in actuation range between these parts?

A: The MRPR-8-22-33 operates within 22 ~ 33AT, while the MRPR-20-22-28 operates within 22 ~ 28AT. The MRPR-20-22-28 has a narrower upper actuation threshold. Applications requiring actuation above 28AT must retain the MRPR-8-22-33 or identify alternative solutions.

Q: Does the MRPR-20-22-28 provide higher current capacity?

A: Yes. The MRPR-20-22-28 switches 1.1A AC / 1.5A DC compared to the MRPR-8-22-33's 700mA AC / 1A DC. The MRPR-20-22-28 also carries 3A DC versus 2.5A DC. These increased ratings provide additional design margin for current-limited applications.

Q: Are there packaging differences between these parts?

A: The MRPR-8-22-33 is listed with "-" packaging designation. The MRPR-20-22-28 is supplied in Bulk packaging. Confirm packaging requirements with procurement specifications.

Q: What is the regulatory status of the MRPR-20-22-28?

A: The MRPR-20-22-28 is ROHS3 Compliant and REACH Unaffected, providing comprehensive regulatory coverage for EU and international markets.