MDSR-7-20-25 Equivalent & Substitute Parts

Part Overview

The MDSR-7-20-25 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 designed for applications requiring reliable switching at moderate current and voltage levels, with a rated power of 10W and switching capability up to 350mA (AC) or 500mA (DC) at 140V AC / 200V DC. The part is currently in active production status with 1917 units in stock. Equivalent and substitute parts are identified when they maintain functional compatibility across critical electrical and mechanical parameters while meeting the same compliance and reliability standards.

Substiute Parts

MDSR-7-20-25

Littelfuse Inc.In Stock: 2004MDSR-7-20-25 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

The ORD 324/10-15 AT from Standex-Meder Electronics qualifies as a functional substitute for the MDSR-7-20-25 based on the following critical parameters:

Matching Parameters:

• Circuit configuration: Both are SPST-NO reed switches
• Type: Both are glass body reed switches
• Mounting type: Both are through-hole devices
• Termination style: Both use axial termination
• Rated power: Both are rated at 10W
• Operating temperature range: Both operate from -40°C to 125°C
• DC switching voltage: Both support 200V DC
• RoHS compliance: Both are ROHS3 compliant
• Moisture sensitivity: Both are MSL 1 (Unlimited)

Substitution Logic: The ORD 324/10-15 AT operates at a lower actuation range (10 ~ 15AT versus 20 ~ 25AT) and provides higher DC switching current capability (500mA DC versus 350mA AC / 500mA DC). The substitute maintains electrical safety margins and mechanical compatibility while offering improved current handling in DC applications. Both devices are active production items with full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the MDSR-7-20-25 and ORD 324/10-15 AT are active production components with full ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for current and future applications. Selection between these parts should be based on the specific actuation force requirement of the application. The MDSR-7-20-25 requires a higher magnetic field (20 ~ 25AT) for actuation, making it suitable for applications where a stronger activation signal is available. The ORD 324/10-15 AT requires a lower magnetic field (10 ~ 15AT), providing sensitivity advantage in applications with limited magnetic force. Both devices maintain identical DC voltage and power ratings, ensuring electrical compatibility in standard switching applications. The ORD 324/10-15 AT offers faster response times (0.4 ms operate, 0.05 ms release versus 0.6 ms and 0.2 ms respectively), which may be advantageous in time-critical applications.

Frequently Asked Questions (FAQ)

Q: Can the ORD 324/10-15 AT directly replace the MDSR-7-20-25 in my circuit?

A: Direct replacement is possible if your application's magnetic actuation field falls within the 10 ~ 15AT range. If your design relies on the 20 ~ 25AT actuation range of the MDSR-7-20-25, the substitute will not function as intended. Verify the magnetic field strength available in your application before substitution.

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

A: The MDSR-7-20-25 actuates at 20 ~ 25AT (Ampere-Turns), while the ORD 324/10-15 AT actuates at 10 ~ 15AT. This means the substitute requires a weaker magnetic field to switch. Applications must provide the appropriate magnetic field strength for the selected component.

Q: Are both parts physically compatible with my PCB layout?

A: Both parts use through-hole axial termination and are mechanically compatible with standard PCB footprints designed for reed switches. However, the ORD 324/10-15 AT is slightly longer (1.744" versus 1.590"), which may affect board layout in space-constrained designs. Verify clearance in your specific application.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MDSR-7-20-25 and ORD 324/10-15 AT are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both are suitable for applications requiring regulatory compliance.

Q: What is the difference in switching speed between these parts?

A: The ORD 324/10-15 AT operates faster, with a 0.4 ms operate time and 0.05 ms release time compared to the MDSR-7-20-25 at 0.6 ms and 0.2 ms respectively. This faster response may be beneficial in applications requiring rapid switching cycles.

Q: Can I use the ORD 324/10-15 AT in AC applications?

A: The provided specifications for the ORD 324/10-15 AT list only DC switching current (500mA DC). The MDSR-7-20-25 explicitly supports both AC (350mA) and DC (500mA) switching. If your application requires AC switching capability, confirm AC ratings for the substitute with the manufacturer before implementation.