RI-01BAA Glass Body Reed Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The RI-01BAA is a glass body reed switch manufactured by Comus International, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a switching capacity of 500mA at 140V AC and 200V DC. This component is rated for 10W power handling with an operate range of 14–23AT and is designed for through-hole mounting with axial termination.

The RI-01BAA is currently obsolete. Active equivalent and substitute parts are available from both Comus International and Littelfuse Inc. that provide comparable electrical and mechanical characteristics suitable for design continuity and production support.

Substiute Parts

RI-01BAA

Comus InternationalIn Stock: 728RI-01BAA Datasheet

Current PartRFQ

RI-03GP2025

Comus InternationalIn Stock: 8775RI-03GP2025 Datasheet

SimilarRFQ

FLEX-14-15-20

LittelfuseIn Stock: 3978FLEX-14-15-20 Datasheet

SimilarRFQ

MDSR-4-12-23

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

SimilarRFQ

MDSR-4-12-28

Littelfuse Inc.In Stock: 1123MDSR-4-12-28 Datasheet

SimilarRFQ

MDSR-4-17-23

Littelfuse Inc.In Stock: 876MDSR-4-17-23 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RI-01BAA is determined by the following key parameters:

• Circuit Configuration: Must be SPST-NO
• Current Capacity: Minimum 500mA switching capacity
• Voltage Ratings: AC switching at 140V and DC switching at 200V
• Power Rating: 10W rated power
• Mounting Type: Through-hole configuration
• Termination Style: Axial leads
• Operating Range: Operate range must overlap or encompass the 14–23AT range

Five substitute parts from Comus International and Littelfuse Inc. meet these criteria. Substitutes are grouped by operate range overlap with the original specification, ensuring functional compatibility in switching applications requiring this magnetic actuation sensitivity.

Parameter Comparison

Engineering Selection Recommendations

RI-03GP2025 (Comus International): This part is the closest functional equivalent, offering the same manufacturer lineage and backward compatibility. Both AC and DC switching specifications align with the RI-01BAA at 140V AC and 200V DC. Product status is active, ensuring ongoing supply and RoHS3 compliance.

FLEX-14-15-20 (Littelfuse): Acceptable substitute for applications requiring 140V AC operation. The operate range of 15–20AT provides overlap within the original 14–23AT specification. AC switching current is 350mA; DC switching is 500mA. Operating temperature range is -40°C, one temperature degree lower than the original specification. Active status with RoHS3 compliance.

MDSR-4-12-23 (Littelfuse Inc.): Suitable for DC applications where AC voltage switching is not required. The operate range of 12–23AT encompasses the original specification. DC switching voltage is 200V with 500mA capacity. Operating temperature minimum is -40°C. Active product status with RoHS3 compliance.

MDSR-4-12-28 (Littelfuse Inc.): Wide operate range of 12–28AT provides maximum flexibility for magnetic field sensitivity variations. Specified for DC applications only. Active product status with RoHS3 compliance. Lowest inventory availability among substitutes.

MDSR-4-17-23 (Littelfuse Inc.): Operate range of 17–23AT provides direct overlap with the upper half of the original specification. Specified for DC applications only. Active product status with RoHS3 compliance.

All substitutes are ROHS3 compliant and maintain through-hole, axial-lead configurations for direct PCB layout compatibility. Selection should account for application requirements regarding AC versus DC operation and specific operate range constraints.

Frequently Asked Questions (FAQ)

Q: Can RI-03GP2025 be used as a direct replacement for RI-01BAA in all applications? A: Yes. RI-03GP2025 provides the same SPST-NO circuit configuration, identical voltage specifications (140V AC, 200V DC), and matching 500mA switching current capacity. The operate range shifts to 20–25AT compared to the original 14–23AT; applications dependent on the lower operate sensitivity must confirm suitability.

Q: Which substitutes support both AC and DC voltage switching? A: RI-03GP2025 and FLEX-14-15-20 both specify 140V AC switching. All other substitutes are DC-only. Applications requiring 140V AC switching capability are limited to these two options.

Q: What is the operating temperature difference between RI-01BAA and its substitutes? A: RI-01BAA operates from -55°C to 125°C. RI-03GP2025 matches this range. FLEX-14-15-20, MDSR-4-12-23, MDSR-4-12-28, and MDSR-4-17-23 operate from -40°C to 125°C, a difference of 15°C at the minimum temperature.

Q: Are all substitutes compatible with the original PCB layout? A: All substitutes maintain through-hole mounting with axial termination, ensuring footprint compatibility. Physical dimensions vary slightly; length overall ranges from 1.590" to 1.811" and body diameter from 0.090" to 0.100". Confirmation of PCB trace spacing and component height clearance is required for applications with tight geometric constraints.

Q: Which substitute is most suitable for new design applications? A: RI-03GP2025 maintains the same manufacturer and all critical specifications. MDSR-4 series alternatives from Littelfuse provide active product status with extended operate range options for design flexibility.

Q: What are the key parameter differences between Comus International and Littelfuse substitutes? A: Comus International substitutes (RI-03GP2025) support AC voltage switching at 140V. Littelfuse substitutes are specified for DC applications only. Operating response times differ: Comus maintains 0.25 ms operate time and 0.03 ms release time, while Littelfuse parts specify 0.6 ms operate and 0.2 ms release time for MDSR series, and 0.55 ms operate and 0.2 ms release for FLEX-14-15-20.