MDSR-4-32-38 Glass Body Reed Switch Equivalent & Substitute Parts

Part Overview

The MDSR-4-32-38 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) contact arrangement. This through-hole component is rated for 500mA DC switching at 200V with a 10W power rating and operates within a 32–38AT magnetic operate range. The component is Active in product status and ROHS3 compliant, making it suitable for industrial control, instrumentation, and automation applications where reed switch technology is specified. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across different manufacturers while meeting the same functional requirements.

Substiute Parts

MDSR-4-32-38

Littelfuse Inc.In Stock: 1064MDSR-4-32-38 Datasheet

Current PartRFQ

ORD 324/10-15 AT

Standex-Meder ElectronicsIn Stock: 17699ORD 324/10-15 AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDSR-4-32-38 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO to maintain identical switching behavior
• Current - Switching: Must support minimum 500mA (DC) switching capacity
• Voltage - Switching DC: Must support minimum 200V DC switching voltage
• Power - Rated: Must support minimum 10W power rating
• Mounting Type: Must be Through Hole for PCB compatibility
• Termination Style: Must be Axial for lead-based connection
• Operating Temperature Range: Must encompass −40°C to 125°C
• RoHS Status: Must be ROHS3 Compliant for regulatory alignment

The ORD 324/10-15 AT from Standex-Meder Electronics meets all mandatory electrical and mechanical substitution criteria. While the operate range differs (10–15AT versus 32–38AT), this represents a distinct functional variant rather than a direct drop-in replacement. Selection between these parts depends on the specific magnetic field strength requirements of the application.

Parameter Comparison

Engineering Selection Recommendations

Both the MDSR-4-32-38 and ORD 324/10-15 AT are Active products with ROHS3 compliance and REACH unaffected status, confirming regulatory alignment for current manufacturing and deployment. Selection between these parts is determined by application-specific magnetic operate range requirements:

• MDSR-4-32-38: Select when the application requires a higher magnetic operate threshold (32–38AT). This part exhibits longer operate time (0.6 ms) and higher DC carry current (1.2A).
• ORD 324/10-15 AT: Select when the application requires a lower magnetic operate threshold (10–15AT). This part exhibits faster operate time (0.4 ms) and faster release time (0.05 ms), with slightly higher capacitance (0.3 pF).

Both parts support identical switching current (500mA DC), voltage (200V DC), and power rating (10W). Physical dimensions differ slightly; verify PCB layout compatibility before substitution.

Frequently Asked Questions (FAQ)

Q: Can the ORD 324/10-15 AT directly replace the MDSR-4-32-38 in an existing design?

A: Direct replacement is possible only if the application's magnetic field strength aligns with the ORD's 10–15AT operate range. The MDSR-4-32-38 requires a stronger magnetic field (32–38AT). Verify the magnetic activation threshold of your application before substitution.

Q: Are there differences in switching speed between these parts?

A: Yes. The ORD 324/10-15 AT operates faster (0.4 ms operate time, 0.05 ms release time) compared to the MDSR-4-32-38 (0.6 ms operate time, 0.2 ms release time). Applications with strict timing requirements should account for these differences.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MDSR-4-32-38 and ORD 324/10-15 AT are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for industrial and consumer applications.

Q: What is the significance of the operate range (AT) specification?

A: The operate range in Ampere-Turns (AT) defines the magnetic field strength required to close the reed switch contacts. The MDSR-4-32-38 requires 32–38AT, while the ORD requires 10–15AT. Selection depends on the magnetic field strength available in your application circuit.

Q: Are there physical dimension differences that affect PCB layout?

A: Yes. The MDSR-4-32-38 is 1.590" (40.39mm) overall length with a 0.090" diameter body, while the ORD 324/10-15 AT is 1.744" (44.30mm) overall length with a 0.087" diameter body. Verify PCB hole spacing and component clearance before substitution.

Q: Can I use the ORD 324/10-15 AT in applications requiring 1.2A DC carry current?

A: The ORD 324/10-15 AT is rated for 1.0A DC carry current, which is lower than the MDSR-4-32-38 (1.2A). If your application requires sustained carry current above 1.0A, the MDSR-4-32-38 is the appropriate selection.