Equivalent & Substitute Parts for MRPR-8-22-38

Part Overview

The MRPR-8-22-38 is a glass body reed switch manufactured by Littelfuse Inc., configured as a single-pole single-throw normally open (SPST-NO) device. This through-hole mounted component operates within a 22–38 AT (Ampere-Turn) range and is rated for 700 mA AC / 1 A DC switching at 265 V AC and 250 V DC, with a maximum power rating of 50 W. The product is currently classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

MRPR-8-22-38

Littelfuse Inc.In Stock: 1249MRPR-8-22-38 Datasheet

Current PartRFQ

MRPR-20-22-38

Littelfuse Inc.In Stock: 1726MRPR-20-22-38 Datasheet

DirectRFQ

KSK-1A35-1015

Standex-Meder ElectronicsIn Stock: 3690KSK-1A35-1015 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MRPR-8-22-38 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Circuit configuration (SPST-NO)
• Operate range compatibility (22–38 AT for direct substitutes)
• Current switching capacity (minimum 700 mA AC / 1 A DC)
• Voltage switching rating (minimum 265 V AC / 250 V DC)
• Power rating (minimum 50 W)
• Mounting compatibility (through-hole or surface-mount with appropriate board integration)
• Operating temperature range overlap (−20°C to 125°C)
• RoHS3 compliance

Substitute Classification:

1. Direct Manufacturer Substitute (MRPR-20-22-38): Same manufacturer (Littelfuse Inc.), identical circuit configuration and operate range, enhanced current and power ratings, through-hole mounting, active product status.

2. Cross-Manufacturer Substitute (KSK-1A35-1015): Different manufacturer (Standex-Meder Electronics), same circuit configuration, different operate range (10–15 AT), different mounting type (surface mount), reduced power rating (20 W), active product status.

Parameter Comparison

Engineering Selection Recommendations

MRPR-20-22-38 (Littelfuse Inc.): This is the primary direct substitute for the MRPR-8-22-38. Both components share identical circuit configuration, operate range, voltage ratings, power rating, and mounting type. The MRPR-20-22-38 offers enhanced current switching capacity (1.1 A AC / 1.5 A DC versus 700 mA AC / 1 A DC) and higher current carry rating (3 A DC versus 2.5 A DC), making it suitable for applications requiring equal or greater switching performance. The MRPR-20-22-38 maintains active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

KSK-1A35-1015 (Standex-Meder Electronics): This cross-manufacturer substitute is applicable only when design constraints permit surface-mount integration and reduced power handling. The KSK-1A35-1015 operates within a different activate range (10–15 AT versus 22–38 AT), features lower voltage ratings (200 V AC/DC versus 265 V AC / 250 V DC), and reduced power rating (20 W versus 50 W). This component is suitable for lower-power applications with compatible magnetic activation requirements. The KSK-1A35-1015 is active and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can the MRPR-20-22-38 directly replace the MRPR-8-22-38 in existing designs?

A: Yes. The MRPR-20-22-38 maintains identical electrical specifications for voltage and power rating, the same circuit configuration (SPST-NO), identical operate range (22–38 AT), and identical through-hole mounting. The enhanced current ratings of the MRPR-20-22-38 are backward compatible with applications designed for the MRPR-8-22-38.

Q: What are the limitations of using the KSK-1A35-1015 as a substitute?

A: The KSK-1A35-1015 differs in three critical parameters: operate range (10–15 AT versus 22–38 AT), voltage rating (200 V versus 265 V AC / 250 V DC), and power rating (20 W versus 50 W). Additionally, it uses surface-mount termination rather than through-hole. This component is suitable only for applications with compatible magnetic activation thresholds and lower power requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The MRPR-20-22-38 and KSK-1A35-1015 are both ROHS3 compliant, matching the compliance status of the MRPR-8-22-38.

Q: What is the difference between the operate range specifications?

A: The operate range, measured in Ampere-Turns (AT), defines the magnetic field strength required to activate the reed switch. The MRPR-8-22-38 and MRPR-20-22-38 both require 22–38 AT for activation. The KSK-1A35-1015 requires 10–15 AT, making it sensitive to weaker magnetic fields. Selection must align with the magnetic activation source in the application.

Q: Can the MRPR-8-22-38 be used in new production designs?

A: No. The MRPR-8-22-38 is classified as obsolete. New designs should specify either the MRPR-20-22-38 (for equivalent performance with enhanced ratings) or the KSK-1A35-1015 (for surface-mount applications with compatible electrical requirements).