FR2S1525

Part Overview

The FR2S1525 is a glass body reed switch manufactured by Coto Technology, configured as a single-pole, single-throw normally-open (SPST-NO) device. This component is rated for 500mA switching current and 200V switching voltage with a 10VA power rating. The product status is obsolete, necessitating the identification of equivalent substitute components for ongoing design requirements and procurement needs.

Substiute Parts

FR2S1525

Coto TechnologyIn Stock: 1185FR2S1525 Datasheet

Current PartRFQ

MLRR-4-17-23

Littelfuse Inc.In Stock: 2776MLRR-4-17-23 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FR2S1525 is evaluated based on the following critical electrical and mechanical parameters:

• Circuit Configuration: Both the main part and substitute must maintain SPST-NO switching topology.
• Switching Current: Substitute minimum current rating must accommodate the 500mA requirement.
• Switching Voltage: Substitute voltage rating must support 200V operation in both AC and DC modes.
• Power Rating: Substitute power handling must meet or exceed the 10VA specification.
• Operating Temperature: Substitute must function across the -40°C ~ 125°C operating range.
• Glass Body Reed Type: Substitute must be a glass body reed switch to maintain form factor and reliability characteristics.

The MLRR-4-17-23 from Littelfuse Inc. qualifies as a substitute based on its SPST-NO configuration, superior current-switching capability (700mA AC / 1A DC), and higher power rating (20W), which exceeds the FR2S1525 requirements. The matching operating temperature range (-40°C ~ 125°C) and glass body reed construction confirm compatibility for functional substitution.

Parameter Comparison

Engineering Selection Recommendations

The MLRR-4-17-23 is available as an active product from Littelfuse Inc., with current inventory support and ROHS3 compliance certification. The FR2S1525, classified as obsolete, presents sourcing constraints for new designs and ongoing production requirements.

Selection of the MLRR-4-17-23 as a substitute is supported by:

• Product Availability: Active status ensures reliable supply and long-term component availability.
• Regulatory Compliance: ROHS3 Compliant certification meets current environmental and manufacturing standards.
• Electrical Margin: Higher current-switching ratings (700mA AC / 1A DC) and increased power handling (20W) provide operational headroom above the original 500mA / 10VA specification.
• Temperature Performance: Identical operating range (-40°C ~ 125°C) confirms thermal compatibility.
• Circuit Topology: Identical SPST-NO configuration ensures functional equivalence.

The mounting type change from Surface Mount to Through Hole requires PCB layout re-evaluation but does not impact electrical performance or functional behavior.

Frequently Asked Questions (FAQ)

Q: Can the MLRR-4-17-23 directly replace the FR2S1525 without design modifications? A: Electrical substitution is valid based on matching circuit configuration (SPST-NO), operating temperature range, and DC switching voltage. However, the mounting type change from Surface Mount to Through Hole requires PCB footprint revision.

Q: Why is the AC switching voltage rating lower for the substitute (140V vs. 200V)? A: The MLRR-4-17-23 maintains 200V DC switching voltage, which covers DC-only applications. For AC applications exceeding 140V, alternative substitutes with higher AC voltage ratings should be evaluated. The DC switching voltage remains at the required 200V specification.

Q: What is the significance of the ROHS3 vs. RoHS Compliant designation? A: Both designations indicate compliance with RoHS (Restriction of Hazardous Substances) directives. ROHS3 represents the current standard for new component designs. Both parts meet environmental compliance requirements for manufacturing and distribution.

Q: Does the higher power rating (20W vs. 10VA) of the MLRR-4-17-23 affect circuit design? A: No. The substitute's higher power rating provides additional operational margin and does not introduce compatibility issues. Components are selected for minimum required specifications; exceeding this requirement improves reliability.

Q: Are there differences in switching speed between these components? A: The MLRR-4-17-23 has a slightly longer operate time (0.6 ms vs. 0.5 ms) and equal release time (0.2 ms). For applications requiring sub-millisecond response characteristics, timing differences should be verified against circuit requirements.

Q: How should the operate range difference (15-25AT vs. 17-23AT) be evaluated? A: The MLRR-4-17-23 operate range is narrower but remains within the overlap of the FR2S1525 specification. Applications operating outside the 17-23AT range may require alternative substitutes.