FR2S2025 Equivalent & Substitute Parts

Part Overview

The FR2S2025 is a glass body reed switch manufactured by Coto Technology, configured as SPST-NO (Single Pole Single Throw Normally Open) with a maximum switching capacity of 500mA at 200V DC/AC. This component is currently classified as Obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers to ensure continuity of supply and design support.

Substiute Parts

FR2S2025

Coto TechnologyIn Stock: 1184FR2S2025 Datasheet

Current PartRFQ

FLEX-14-20-25

Littelfuse Inc.In Stock: 36737FLEX-14-20-25 Datasheet

DirectRFQ

MLRR-4-22-28

Littelfuse Inc.In Stock: 779MLRR-4-22-28 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of reed switches requires strict equivalence across electrical switching characteristics and mechanical mounting constraints. The primary substitution criteria are:

1. Circuit Configuration: Must be SPST-NO to maintain identical switching logic
2. Switching Current: Must support minimum 500mA switching capacity
3. Switching Voltage: Must support minimum 200V DC and AC
4. Operate Range: Must accommodate the 20-25AT magnetic actuation threshold or overlap substantially with this range
5. Mounting Type: Preference for surface mount to minimize redesign; through-hole alternatives acceptable with board layout modification
6. Compliance: RoHS compliance status must match or exceed original part

Based on these criteria, the following substitutes are identified:

• FLEX-14-20-25 (Littelfuse Inc.): Direct functional equivalent with matching operate range (20-25AT), SPST-NO configuration, and equivalent power rating. Supports 500mA DC switching at 200V. Mounting transition from surface mount to through-hole required.
• MLRR-4-22-28 (Littelfuse Inc.): Similar substitute with higher switching capacity (700mA AC / 1A DC) and marginally higher operate range (22-28AT). Supports 200V DC switching. Through-hole mounting. Suitable for applications where increased current margin is beneficial.

Parameter Comparison

Engineering Selection Recommendations

FLEX-14-20-25 is the primary recommended substitute. It maintains identical electrical characteristics with the FR2S2025 across DC switching voltage and current, identical operate range, and matching power rating. Both parts are RoHS compliant with unlimited moisture sensitivity ratings. The transition from surface mount to through-hole mounting requires board redesign but presents no electrical or thermal constraints.

MLRR-4-22-28 serves as an alternative for applications requiring increased current-switching capacity. Its 700mA AC and 1A DC ratings provide margin for designs approaching the FR2S2025 current limits. The 22-28AT operate range overlaps the original specification but extends the upper actuation threshold. This part is appropriate when component robustness and thermal margin are prioritized over exact parameter matching.

Both substitutes are supplied by Littelfuse Inc., an active manufacturer with established product support, ensuring long-term availability and technical documentation.

Frequently Asked Questions (FAQ)

Q: Can FLEX-14-20-25 directly replace FR2S2025 without circuit modification?

A: Electrical compatibility is complete. However, mounting type transitions from surface mount to through-hole, requiring printed circuit board redesign and assembly process changes.

Q: Which substitute is appropriate for AC applications at 200V?

A: FR2S2025 was rated for 200V AC switching. FLEX-14-20-25 is rated for 140V AC maximum. For circuits requiring 200V AC switching, MLRR-4-22-28 maintains 140V AC and provides DC equivalent at 200V. Circuit voltage requirements must be confirmed before substitution.

Q: What is the magnetic actuation difference between FR2S2025 and MLRR-4-22-28?

A: FR2S2025 operates at 20-25AT (Ampere-Turns); MLRR-4-22-28 operates at 22-28AT. The 2AT offset in lower threshold means slightly higher magnetic field requirement to actuate the MLRR switch, which may affect circuit behavior in low-field applications.

Q: Are both substitutes RoHS compliant?

A: Both FLEX-14-20-25 and MLRR-4-22-28 are ROHS3 compliant, meeting current lead-free and hazardous substance restrictions.

Q: Can MLRR-4-22-28 be used in high-frequency switching applications?

A: Operating and release times are provided (0.6ms and 0.2ms respectively). Applications involving switching frequencies above 500 Hz require detailed analysis of reed switch performance at elevated frequencies, as these mechanical devices are optimized for DC and low-frequency AC circuits.