RI-29A Reed Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The RI-29A is a glass body reed switch manufactured by Comus International, classified as a SPST-NO (Single Pole Single Throw - Normally Open) configuration. This through-hole mounted component is rated for 1A switching current at 140V AC and 200V DC, with a maximum power rating of 20W. The RI-29A operates within a 20 to 34AT magnetic field range and is currently listed as obsolete. Due to its obsolete status, identifying equivalent substitute parts is necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

RI-29A

Comus InternationalIn Stock: 834RI-29A Datasheet

Current PartRFQ

RI-29GP2025

Comus InternationalIn Stock: 1097RI-29GP2025 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RI-29A is determined by the following critical parameters:

Mandatory Matching Parameters:

• Circuit Configuration: SPST-NO
• Current - Switching: 1A (AC/DC)
• Voltage - Switching AC: 140V
• Voltage - Switching DC: 200V
• Power - Rated: 20W
• Mounting Type: Through Hole
• Termination Style: Axial
• Type: Glass Body Reed
• Operating Temperature Range: -55°C to 75°C

Allowable Variation Parameters:

• Operate Range: The RI-29A operates within 20 to 34AT. Substitute parts with narrower operate ranges (such as 20 to 25AT) remain functionally compatible provided the specified range encompasses the application's magnetic field requirements.
• Product Status: Active substitute parts are preferred for obsolete components to ensure long-term availability and supply chain continuity.

The RI-29GP2025 meets all mandatory matching parameters and is classified as an active product, making it a direct substitute for the obsolete RI-29A.

Parameter Comparison

Engineering Selection Recommendations

The RI-29GP2025 is the direct substitute for the obsolete RI-29A. Both components share identical electrical ratings, mechanical dimensions, and environmental specifications. The RI-29GP2025 is manufactured by the same supplier (Comus International) and maintains full compatibility with applications originally designed for the RI-29A.

The primary distinction between these parts is product status and compliance certification. The RI-29A is obsolete, whereas the RI-29GP2025 is an active product with current manufacturing support. The RI-29GP2025 carries ROHS3 compliance, representing an updated regulatory certification compared to the RI-29A's RoHS Compliant designation. Both parts maintain REACH Unaffected status and identical export classification (EAR99).

The operate range difference (RI-29A: 20 to 34AT versus RI-29GP2025: 20 to 25AT) represents a narrower magnetic field sensitivity window for the substitute part. This difference is acceptable for applications where the magnetic field strength remains within the 20 to 25AT range. For applications requiring operation above 25AT, the narrower range of the RI-29GP2025 must be evaluated against specific system requirements.

Frequently Asked Questions (FAQ)

Q: Can the RI-29GP2025 directly replace the RI-29A in existing designs?

A: Yes. The RI-29GP2025 is electrically and mechanically identical to the RI-29A. Both components feature the same switching current (1A AC/DC), voltage ratings (140V AC / 200V DC), power rating (20W), through-hole mounting, and axial termination. Physical dimensions and operating temperature ranges are identical.

Q: What is the significance of the different operate ranges?

A: The RI-29A operates within a 20 to 34AT magnetic field range, while the RI-29GP2025 operates within 20 to 25AT. The operate range defines the magnetic field strength at which the reed switch closes. The RI-29GP2025 has a narrower range. If your application's magnetic field strength falls within 20 to 25AT, both parts are interchangeable. If your application requires operation above 25AT, the RI-29GP2025 may not function as intended.

Q: Why is the RI-29A listed as obsolete?

A: The RI-29A is no longer in active production. The RI-29GP2025 represents the current active equivalent from Comus International's RI-29 series. For new designs and ongoing production, the RI-29GP2025 is the recommended selection.

Q: Are there packaging differences between these parts?

A: The RI-29A packaging information is listed as not specified. The RI-29GP2025 is supplied in bulk packaging. Both parts are through-hole mounted components with axial termination, suitable for standard PCB assembly processes.

Q: Do both parts meet current regulatory requirements?

A: Both the RI-29A and RI-29GP2025 are RoHS compliant. The RI-29GP2025 carries the updated ROHS3 certification. Both parts maintain REACH Unaffected status and are classified under ECCN EAR99 for export purposes.

Q: What is the moisture sensitivity level for these components?

A: Both the RI-29A and RI-29GP2025 have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without special moisture control measures.