RI-23AAA Glass Body Reed Switch SPST-NO 250mA 140V Equivalent & Substitute Parts

Part Overview

The Comus International RI-23AAA is a glass body reed switch with SPST-NO configuration, rated for 250mA AC/DC at 140V AC (200V DC), and 10W power dissipation. This part is obsolete and no longer in active production. Alternative models are necessary to ensure design continuity and product availability for new applications or maintenance requirements.

Substiute Parts

RI-23AAA

Comus InternationalIn Stock: 733RI-23AAA Datasheet

Current PartRFQ

RI-23GP-1015

Comus InternationalIn Stock: 812RI-23GP-1015 Datasheet

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MDSR-4-12-23

Littelfuse Inc.In Stock: 4594MDSR-4-12-23 Datasheet

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MACD-14-10-15

Littelfuse Inc.In Stock: 1258MACD-14-10-15 Datasheet

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MACD-14-15-20

Littelfuse Inc.In Stock: 813MACD-14-15-20 Datasheet

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MACD-14-20-25

Littelfuse Inc.In Stock: 1838MACD-14-20-25 Datasheet

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MARR-5-12-23

Littelfuse Inc.In Stock: 960MARR-5-12-23 Datasheet

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MASM-14R-10-15

Littelfuse Inc.In Stock: 2070MASM-14R-10-15 Datasheet

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MDCG-4-12-18

LittelfuseIn Stock: 5534MDCG-4-12-18 Datasheet

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MDCG-4-12-23

Littelfuse Inc.In Stock: 736MDCG-4-12-23 Datasheet

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MDCG-4-12-28

Littelfuse Inc.In Stock: 1041MDCG-4-12-28 Datasheet

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MDCG-4-12-33

Littelfuse Inc.In Stock: 2316MDCG-4-12-33 Datasheet

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MDCG-4-12-38

Littelfuse Inc.In Stock: 1206MDCG-4-12-38 Datasheet

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MDCG-4-7-13

Littelfuse Inc.In Stock: 2028MDCG-4-7-13 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute selection for the RI-23AAA is determined by the following critical parameters:

• Circuit Configuration: SPST-NO operation is required for all substitutes
• Mounting Type and Termination: Through Hole with Axial termination for direct board-level compatibility
• Current Rating: Minimum 250mA switching capability at rated voltage
• Voltage Rating: AC and DC voltage specifications must meet or exceed 140V AC / 200V DC
• Power Dissipation: 10W rated power is the baseline requirement
• Operating Temperature Range: Must support -55°C minimum for legacy applications
• Compliance Status: RoHS3 compliance is required for new production alternatives

Substitutes are grouped into two categories: Direct Series Continuation (same manufacturer upgrade path) and Cross-Manufacturer Equivalents (alternative manufacturers with compatible specifications).

Parameter Comparison

Engineering Selection Recommendations

Direct Series Continuation (Preferred)

RI-23GP-1015 (Comus International) provides the most seamless transition path from the obsolete RI-23AAA. This part maintains identical electrical specifications (250mA AC/DC, 140V AC / 200V DC, 10W), identical response times (0.1ms operate / 0.07ms release), and identical Through Hole Axial mounting. The part is in active production status with RoHS3 compliance. The narrower operate range (10~15AT vs 8~16AT) is acceptable for applications originally designed for the lower threshold sensitivity of the RI-23AAA. Current inventory is 766 units.

Cross-Manufacturer Alternatives

Littelfuse reed switch series provide active, RoHS3-compliant alternatives with enhanced current ratings. Selection within this family depends on operate range requirements:

• MACD-14 Series (Littelfuse Inc.): Available in 10~15AT, 15~20AT, and 20~25AT operate ranges. All models support 140V AC / 200V DC with 350mA AC / 500mA DC capability. Appropriate for low-to-moderate operate range applications.

• MDCG-4 Series (Littelfuse): Available in 12~18AT, 12~23AT, and 12~28AT operate ranges. All models support 140V AC / 200V DC with 350mA AC / 500mA DC capability. Suitable for mid-range operate sensitivity applications.

• MDSR-4-12-23 (Littelfuse Inc.): Supports 500mA DC operation but requires 200V DC operation only (no AC rating). Use only for DC-only applications.

• MARR-5-12-23 (Littelfuse Inc.): Extended voltage rating (265V AC / 1000V DC) for higher-voltage applications. Slower response times (0.75ms operate / 0.3ms release) require circuit timing validation.

All active alternatives carry RoHS3 certification and sufficient inventory for production requirements.

Frequently Asked Questions (FAQ)

Q: Can RI-23GP-1015 directly replace RI-23AAA in existing designs?

A: Yes. The RI-23GP-1015 maintains identical current rating (250mA), voltage specifications (140V AC / 200V DC), power dissipation (10W), response times, and mounting configuration. The 10~15AT operate range overlaps the original 8~16AT range, providing compatibility for applications within that overlap window.

Q: What is the difference between AC and DC current ratings in substitute parts?

A: The current rating represents the maximum current the reed switch can handle at the specified voltage without contact degradation. Littelfuse MACD-14 and MDCG-4 series specify 350mA AC and 500mA DC because contact materials handle AC and DC differently. Applications using 250mA AC or DC are within specification for all rated substitutes except MDSR-4-12-23, which operates in DC mode only.

Q: Why do some substitutes have different response times?

A: Littelfuse alternatives (0.6ms operate / 0.2ms release) have slower response compared to the original RI-23AAA and RI-23GP-1015 (0.1ms operate / 0.07ms release). Circuit designs dependent on sub-millisecond switching should retain the Comus International RI-23GP-1015. Applications with timing tolerances exceeding 0.6ms can use Littelfuse alternatives.

Q: Are surface mount alternatives available for the RI-23AAA?

A: MASM-14R-10-15 (Littelfuse) is a surface mount equivalent with identical electrical specifications (140V AC / 200V DC, 350mA AC / 500mA DC, 10W). PCB design modifications are required for mounting transition from Through Hole Axial to Surface Mount Gull Wing.

Q: Which substitute is recommended for high-voltage DC applications?

A: MARR-5-12-23 supports 1000V DC with 265V AC, exceeding the original 200V DC specification. Operating temperature range extends to -75°C, providing broader environmental capability. Response times are slower (0.75ms operate / 0.3ms release). Use only when higher voltage and wider temperature requirements justify timing differences.

Q: How do operate range specifications affect substitution?

A: Operate range (measured in Ampere-Turns) defines the magnetic field strength required to close the switch. Original RI-23AAA specification is 8~16AT. Substitute selection should match the magnetic circuit design of the actuating magnet. For applications with tighter coupling margins, narrower operate ranges such as MACD-14-10-15 (10~15AT) provide better reliability. For applications with generous spacing, wider ranges such as MDCG-4-12-28 (12~28AT) offer tolerance for component variations.