RI-25AA Glass Body Reed Switch SPST-NO Equivalent and Substitute Parts

Part Overview

The RI-25AA is a glass body reed switch manufactured by Comus International, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a rated switching capacity of 1A at 140V AC and 200V DC. The RI-25AA operates within a 14 ~ 23AT activation range with a maximum power rating of 15W and is designed for through-hole mounting applications. This product is currently obsolete, necessitating identification of functionally equivalent alternatives that meet the same electrical and mechanical requirements for continued system support and new design implementations.

Substiute Parts

RI-25AA

Comus InternationalIn Stock: 769RI-25AA Datasheet

Current PartRFQ

MLRR-3-17-23

Littelfuse Inc.In Stock: 1091MLRR-3-17-23 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MLRR-3-17-23 manufactured by Littelfuse Inc. is classified as a direct substitute for the RI-25AA based on the following critical electrical and mechanical parameters:

Electrical Compatibility Parameters:

• Circuit Configuration: Both parts are SPST-NO reed switches
• Voltage Switching Rating: Both support 140V AC and 200V DC operation
• Mounting Architecture: Both utilize through-hole axial termination

Mechanical Compatibility Parameters:

• Body Type: Both are glass body reed switches
• Overall Length: Similar dimensional profile (RI-25AA: 1.811"; MLRR-3-17-23: 2.230")
• Body Diameter: Compatible dimensions (RI-25AA: 0.100" Dia; MLRR-3-17-23: 0.105" Dia)

Operating Range Compatibility:

• RI-25AA Operate Range: 14 ~ 23AT
• MLRR-3-17-23 Operate Range: 17 ~ 23AT (subset of original range, but covers upper activation threshold band)

The MLRR-3-17-23 satisfies substitution criteria for applications operating within the 17 ~ 23AT range where the RI-25AA would have been specified.

Parameter Comparison

Engineering Selection Recommendations

The MLRR-3-17-23 is available as an active, in-stock alternative to the obsolete RI-25AA. Both parts maintain compliance with RoHS and REACH regulatory standards. The MLRR-3-17-23 carries ROHS3 certification, representing current regulatory alignment.

Selection of the MLRR-3-17-23 as a substitute is appropriate for applications where the following conditions are met: the magnetic activation threshold operates within the 17 ~ 23AT band, DC switching at 1A satisfies the current requirement, and the operating temperature does not fall below -40°C. Where applications require AC switching at the full 1A rating or operate below -40°C, the dimensional and electrical characteristics of the MLRR-3-17-23 must be evaluated against the specific system requirements.

Frequently Asked Questions (FAQ)

Q: What is the primary reason for identifying substitute parts for the RI-25AA? A: The RI-25AA is classified as obsolete. The MLRR-3-17-23 from Littelfuse Inc. is maintained as an active product with equivalent electrical performance and mechanical compatibility for continued system support.

Q: Are the voltage and circuit ratings identical between the RI-25AA and MLRR-3-17-23? A: Yes. Both parts are rated for 140V AC and 200V DC switching operation and are configured as SPST-NO reed switches. Both maintain identical voltage handling specifications.

Q: What is the difference in activation range between these parts? A: The RI-25AA operates across a 14 ~ 23AT range, while the MLRR-3-17-23 operates within a 17 ~ 23AT range. The substitute part covers the upper activation threshold band but does not extend to the lower 14 ~ 17AT activation threshold.

Q: How do the current ratings compare? A: For DC switching, both parts are rated at 1A. For AC switching, the RI-25AA is rated at 1A while the MLRR-3-17-23 is rated at 700mA. Applications requiring full 1A AC switching capacity must evaluate this difference against system specifications.

Q: Are there temperature operating range differences? A: Yes. The RI-25AA operates from -55°C to 125°C, while the MLRR-3-17-23 operates from -40°C to 125°C. Applications requiring operation below -40°C cannot use the MLRR-3-17-23 as a direct substitute.

Q: Are both parts physically compatible for through-hole mounting? A: Yes. Both parts utilize through-hole axial termination with compatible body dimensions. The MLRR-3-17-23 has a slightly larger overall length (2.230" vs 1.811") and body diameter (0.105" vs 0.100" Dia), but both conform to standard PCB through-hole mounting specifications.

Q: Do both parts meet current regulatory compliance standards? A: Yes. Both the RI-25AA (RoHS Compliant) and MLRR-3-17-23 (ROHS3 Compliant) meet RoHS and REACH requirements. The MLRR-3-17-23 carries current-generation ROHS3 certification.