FR2026 Reed Switch Equivalent & Substitute Parts

Part Overview

The FR2026 is a glass body reed switch manufactured by Coto Technology, configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This surface mount component is rated for 500mA switching current at 200V (AC/DC) with a 10VA power rating and operates within a 20–25AT magnetic operate range. The FR2026 is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

FR2026

Coto TechnologyIn Stock: 898FR2026 Datasheet

Current PartRFQ

MDSM-4R-12-18

Littelfuse Inc.In Stock: 10223MDSM-4R-12-18 Datasheet

DirectRFQ

MDSM-10R-20-25

Littelfuse Inc.In Stock: 52608MDSM-10R-20-25 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FR2026 are identified based on strict alignment with the following critical parameters:

Primary Substitution Criteria:

• Circuit configuration: SPST-NO
• Type: Glass body reed switch
• Mounting type: Surface mount with gull wing termination
• Operating temperature range: −40°C to 125°C
• RoHS3 compliance and MSL 1 rating

Secondary Compatibility Parameters:

• Switching current capacity: minimum 500mA (AC/DC)
• Switching voltage: minimum 200V (DC)
• Operate range: 20–25AT (exact match required for functional equivalence)
• Power rating: 10VA or greater

The substitute parts listed below meet these criteria and are manufactured by Littelfuse Inc., an active supplier with current production status.

Parameter Comparison

Engineering Selection Recommendations

MDSM-10R-20-25 (Littelfuse Inc.) – Primary Substitute

The MDSM-10R-20-25 is the direct functional equivalent for the FR2026. Both devices share identical operate range specifications (20–25AT), matching switching voltage at 200V DC, and equivalent switching current capacity at 500mA DC. Operating time is identical at 0.5 ms. The MDSM-10R-20-25 is manufactured by Littelfuse Inc., an active supplier with current production status and full RoHS3 compliance. This part is suitable for direct replacement in applications where the FR2026 is specified.

MDSM-4R-12-18 (Littelfuse Inc.) – Conditional Substitute

The MDSM-4R-12-18 is a glass body reed switch with SPST-NO configuration and surface mount gull wing termination. However, this part operates within a 12–18AT magnetic range, which differs from the FR2026 specification of 20–25AT. AC switching current is rated at 350mA, below the FR2026's 500mA AC specification. This part is suitable only for applications where the lower operate range and reduced AC switching current are acceptable. The MDSM-4R-12-18 is manufactured by Littelfuse Inc. with active product status and full compliance certifications.

Both substitute parts are manufactured by Littelfuse Inc., an active supplier with current inventory availability, RoHS3 compliance, and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the MDSM-10R-20-25 be used as a direct replacement for the FR2026?

A: Yes. The MDSM-10R-20-25 meets all critical electrical and mechanical parameters of the FR2026, including identical operate range (20–25AT), switching voltage (200V DC), switching current (500mA DC), and operating temperature range (−40°C to 125°C). Both are surface mount glass body reed switches with gull wing termination and RoHS3 compliance.

Q: What is the key difference between the MDSM-4R-12-18 and MDSM-10R-20-25?

A: The primary differences are operate range and AC switching current. The MDSM-4R-12-18 operates within 12–18AT with 350mA AC switching current, while the MDSM-10R-20-25 operates within 20–25AT with 350mA AC switching current. The MDSM-10R-20-25 matches the FR2026 operate range specification exactly.

Q: Is the MDSM-4R-12-18 suitable for applications requiring 500mA AC switching current?

A: No. The MDSM-4R-12-18 is rated for 350mA AC switching current, which is below the FR2026's 500mA AC specification. This part is suitable only for applications where the reduced AC current rating is acceptable.

Q: Are both substitute parts RoHS3 compliant?

A: Yes. Both the MDSM-4R-12-18 and MDSM-10R-20-25 are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH unaffected status.

Q: What is the packaging format for the substitute parts?

A: Both substitute parts are supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes.

Q: Do the substitute parts have the same physical dimensions as the FR2026?

A: The substitute parts have similar but not identical physical dimensions. The MDSM-10R-20-25 has a shorter overall length (0.615" versus 0.770") and smaller body size. Physical dimensions must be verified against PCB layout requirements before implementation.

Q: What is the product status of the substitute parts?

A: Both MDSM-4R-12-18 and MDSM-10R-20-25 are manufactured by Littelfuse Inc. with active product status and current production availability, ensuring long-term supply continuity.