MLRR-3-22-28 Reed Switch Equivalent & Substitute Parts

Part Overview

The MLRR-3-22-28 is a glass body reed switch manufactured by Littelfuse, configured as a single-pole single-throw normally open (SPST-NO) contact arrangement. This through-hole mounted component operates within a 22–28 AT (Ampere-Turn) range and is rated for 700mA AC / 1A DC switching at 140V AC and 200V DC, with a maximum power dissipation of 20W. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across different mounting technologies or dimensional configurations, provided all critical switching parameters remain within acceptable operational limits.

Substiute Parts

MLRR-3-22-28

LittelfuseIn Stock: 1657MLRR-3-22-28 Datasheet

Current PartRFQ

KSK-1A35-1015

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MLRR-3-22-28 is determined by the following critical parameters:

• Circuit Configuration: Must remain SPST-NO
• Switching Current Capacity: Must support minimum 700 mA AC or 1 A DC
• Switching Voltage: Must support minimum 140 V AC and 200 V DC
• Rated Power: Must support minimum 20 W
• Glass Body Reed Type: Must maintain glass body construction
• RoHS3 Compliance: Required for regulatory equivalence
• Operating Temperature Range: Must encompass −40°C to 125°C minimum

The identified substitute KSK-1A35-1015 meets these criteria with enhanced electrical ratings (1 A AC/DC at 200 V) and improved switching speed characteristics. The primary difference is mounting technology: the substitute uses surface mount configuration versus the original through-hole design. This distinction requires circuit board layout compatibility assessment during selection.

Parameter Comparison

Engineering Selection Recommendations

Both the MLRR-3-22-28 and KSK-1A35-1015 maintain active production status with full RoHS3 compliance and REACH unaffected designation, ensuring regulatory equivalence for industrial and commercial applications.

The KSK-1A35-1015 substitute provides enhanced electrical performance: increased AC switching current capacity (1 A versus 700 mA), improved switching response times (0.5 ms operate / 0.1 ms release versus 0.7 ms / 0.2 ms), and extended temperature operating range (−40°C to 130°C versus −40°C to 125°C). DC switching current and voltage ratings remain equivalent at 1 A and 200 V respectively.

Selection between these parts depends on mounting technology requirements. The original MLRR-3-22-28 is specified for through-hole PCB assembly, while the KSK-1A35-1015 is configured for surface mount technology. Circuit board design and assembly process capabilities must align with the selected mounting type. Both components carry identical rated power (20 W) and moisture sensitivity classification, supporting equivalent reliability in sealed or controlled-environment applications.

Frequently Asked Questions (FAQ)

Q: Can the KSK-1A35-1015 directly replace the MLRR-3-22-28 in existing designs?

A: Electrical substitution is valid provided the circuit board supports surface mount termination. The substitute meets or exceeds all critical switching parameters (current, voltage, power rating). Through-hole to surface-mount conversion requires PCB layout modification and assembly process compatibility assessment.

Q: What are the key differences between these two reed switches?

A: The primary difference is mounting technology: MLRR-3-22-28 uses through-hole axial termination, while KSK-1A35-1015 uses surface-mount axial/flat termination. The substitute offers faster switching response (0.5 ms vs. 0.7 ms operate time) and higher AC current capacity (1 A vs. 700 mA). Both maintain identical 20 W power rating and 200 V DC switching voltage.

Q: Are both parts suitable for the same operating temperature range?

A: The MLRR-3-22-28 operates from −40°C to 125°C, while the KSK-1A35-1015 extends to −40°C to 130°C. The substitute accommodates a wider upper temperature limit. For applications requiring operation above 125°C, only the KSK-1A35-1015 is suitable.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both components are RoHS3 compliant, REACH unaffected, and carry EAR99 export classification. Moisture sensitivity level is identical (MSL 1 – Unlimited) for both parts, supporting equivalent reliability in standard industrial packaging and storage conditions.

Q: What is the operate range specification, and how does it affect substitution?

A: Operate range (measured in Ampere-Turns or AT) defines the magnetic field strength required to close the reed switch contacts. The MLRR-3-22-28 operates at 22–28 AT, while the KSK-1A35-1015 operates at 10–15 AT. This difference affects coil design in relay applications. For direct reed switch replacement without coil modification, operate range compatibility must be confirmed with the application circuit.