FR2024 Reed Switch SPST-NO - Equivalent & Substitute Parts

Part Overview

The FR2024 is a glass body reed switch manufactured by Coto Technology in the FR2 series, configured as a single-pole single-throw normally open (SPST-NO) switch. This component is rated for 500mA switching current at 200V (AC/DC) with a 10VA power rating and operates within a 10 ~ 15AT magnetic actuation range. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and component sourcing.

Substiute Parts

FR2024

Coto TechnologyIn Stock: 1213FR2024 Datasheet

Current PartRFQ

MDSM-4R-12-18

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

DirectRFQ

ORD 324/10-15 AT

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FR2024 reed switch is determined by compatibility across the following critical electrical and mechanical parameters:

Electrical Compatibility Requirements:

• Circuit configuration: SPST-NO maintained across all candidates
• Switching current: Minimum 500mA at rated voltage
• Switching voltage: 200V DC capability is required; AC voltage must support 200V or higher
• Power rating: Minimum 10VA or 10W
• Operate range: 10 ~ 15AT (exact overlap required for magnetic compatibility)

Mechanical Compatibility Requirements:

• Type: Glass body reed construction
• Mounting: Surface mount (primary requirement) or through-hole (functional alternative if footprint permits)
• Termination style: Gull wing (primary) or axial (through-hole alternatives)

Environmental & Compliance Requirements:

• Operating temperature: -40°C ~ 125°C
• RoHS3 compliance

Two substitute candidates have been identified:

1. MDSM-4R-12-18 (Littelfuse Inc.) - Direct electrical substitute with operational tradeoffs
2. ORD 324/10-15 AT (Standex-Meder Electronics) - Functional equivalent with mounting form factor difference

Parameter Comparison

Engineering Selection Recommendations

MDSM-4R-12-18 (Littelfuse Inc.) is the preferred direct substitute for surface mount applications. This part maintains ROHS3 compliance and active product status, ensuring supply chain availability. The MDSM-4R-12-18 shares identical DC switching specifications (500mA at 200V) and equivalent environmental ratings (-40°C ~ 125°C). The operate range shift from 10 ~ 15AT to 12 ~ 18AT indicates increased magnetic sensitivity; this part requires a stronger actuation field. The reduction in AC switching current from 500mA to 350mA and AC voltage from 200V to 140V limits this substitute to DC-only applications where AC switching at 200V is required.

ORD 324/10-15 AT (Standex-Meder Electronics) is a functional equivalent for through-hole mounting scenarios. This part maintains exact magnetic operate range compatibility (10 ~ 15AT) and identical DC switching parameters (500mA at 200V). ROHS3 compliance and active status are confirmed. The through-hole termination style and axial lead configuration present a significant form factor departure from the surface mount gull wing original. Implementation requires PCB redesign to accommodate axial through-hole mounting. This substitute is suitable only when PCB layout permits through-hole component placement.

Both substitutes are ROHS3 compliant and carry unlimited moisture sensitivity levels (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can MDSM-4R-12-18 replace FR2024 in all applications?

A: Direct replacement is possible for DC-only circuits. For circuits requiring AC switching at 200V, the MDSM-4R-12-18 is not suitable due to reduced AC voltage rating (140V) and reduced AC switching current rating (350mA versus 500mA). Additionally, the operate range shifts from 10 ~ 15AT to 12 ~ 18AT, requiring stronger magnetic actuation. DC applications at 500mA and 200V are fully supported.

Q: What is the magnetic operate range difference between FR2024 and its substitutes?

A: The FR2024 operates within 10 ~ 15AT. The MDSM-4R-12-18 requires 12 ~ 18AT, meaning a stronger magnetic field is required for actuation. The ORD 324/10-15 AT maintains the original 10 ~ 15AT range, requiring no adjustment to actuation circuitry.

Q: Is ORD 324/10-15 AT a suitable choice for new designs?

A: The ORD 324/10-15 AT is functionally equivalent but requires through-hole mounting, which differs from the surface mount requirement of the original FR2024. This substitution is only appropriate if PCB redesign is feasible and through-hole component placement is acceptable for the target application.

Q: Are all substitutes RoHS compliant?

A: Yes. Both MDSM-4R-12-18 and ORD 324/10-15 AT are ROHS3 compliant, matching the compliance profile of the original FR2024.

Q: Which substitute has active product status?

A: Both MDSM-4R-12-18 (Littelfuse) and ORD 324/10-15 AT (Standex-Meder) carry active product status, ensuring availability through standard component distribution channels.

Q: What is the primary limiting factor for MDSM-4R-12-18 substitution?

A: The reduced AC switching voltage rating (140V versus 200V) and reduced AC switching current (350mA versus 500mA) limit use to DC applications. Additionally, the higher operate range (12 ~ 18AT versus 10 ~ 15AT) requires stronger magnetic fields for actuation compared to the original FR2024.