Equivalent & Substitute Parts: RI-01CA

Part Overview

The RI-01CA is a Glass Body Reed Switch manufactured by Comus International, configured as SPST-NO (Single Pole Single Throw - Normally Open) with a switching capacity of 500mA at 140V AC and 200V DC. The RI-01CA operates at 10W rated power with an operate range of 16 ~ 25AT and is mounted through hole with axial termination.

The RI-01CA is listed as Obsolete product status. Identifying equivalent and substitute parts is necessary to support ongoing applications and ensure supply chain continuity for systems currently utilizing this component.

Key Parameters

Parameter	Value
Manufacturer Part Number	RI-01CA
Manufacturer	Comus International
Circuit Type	SPST-NO
Current - Switching	500mA (AC/DC)
Voltage - Switching AC	140 V
Voltage - Switching DC	200 V
Power - Rated	10W
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
Product Status	Obsolete
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of reed switches requires strict alignment of electrical and mechanical parameters. The critical parameters governing substitutability for the RI-01CA are:

Electrical Parameters:

Circuit configuration (SPST-NO)
Current rating: minimum 500mA switching capacity
Voltage rating: minimum 140V AC / 200V DC switching capability
Power rating: minimum 10W

Mechanical Parameters:

Mounting style compatibility (Through Hole vs. Surface Mount)
Overall dimensions and body size

The substitute parts identified meet the core electrical requirements (SPST-NO circuit, 500mA+ current handling, 140V AC / 200V DC voltage rating, 10W+ power rating) but differ in mounting type, physical dimensions, operate range specifications, and product status. These differences must be evaluated within the constraints of the target application.

Parameter Comparison

Parameter	RI-01CA (Main)	RI-07GP-2025 (Substitute)	MLRR-3-17-23 (Substitute)
Manufacturer	Comus International	Comus International	Littelfuse Inc.
Circuit Type	SPST-NO	SPST-NO	SPST-NO
Current - Switching	500mA (AC/DC)	500mA (AC/DC)	700mA (AC), 1A (DC)
Voltage - Switching AC	140 V	140 V	140 V
Voltage - Switching DC	200 V	200 V	200 V
Power - Rated	10W	10W	20W
Operate Range	16 ~ 25AT	20 ~ 25AT	17 ~ 23AT
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Surface Mount	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RI-07GP-2025 (Comus International): This substitute maintains the same manufacturer (Comus International), identical voltage and power ratings, and equivalent current switching capacity. The part is Active status, ensuring ongoing availability and support. ROHS3 compliance exceeds the RoHS Compliant status of the RI-01CA. The primary design consideration is the transition from Through Hole to Surface Mount mounting, which requires PCB redesign. The operate range of 20 ~ 25AT overlaps the RI-01CA range, though the lower bound is shifted higher.

MLRR-3-17-23 (Littelfuse Inc.): This Littelfuse substitute offers higher current capacity (700mA AC / 1A DC) and double the power rating (20W), providing increased performance margin. Active product status and ROHS3 compliance support long-term availability. The Through Hole mounting preserves mechanical compatibility with existing PCB layouts. The operate range of 17 ~ 23AT overlaps the RI-01CA specification. The higher performance characteristics and mechanical compatibility make this option suitable for applications where the design footprint must remain unchanged.

Frequently Asked Questions (FAQ)

Q: Why is the RI-01CA being replaced? A: The RI-01CA is listed as Obsolete, meaning Comus International has discontinued production and ongoing availability cannot be assured. Active substitute parts ensure supply chain continuity.

Q: Can RI-07GP-2025 be used as a direct replacement for RI-01CA? A: RI-07GP-2025 meets all electrical requirements (500mA, 140V AC, 200V DC, 10W, SPST-NO) but uses Surface Mount instead of Through Hole packaging. This requires PCB redesign. The operate range of 20 ~ 25AT is compatible with applications using the upper portion of the RI-01CA's 16 ~ 25AT range.

Q: Can MLRR-3-17-23 be used as a direct replacement for RI-01CA? A: MLRR-3-17-23 exceeds the RI-01CA electrical specifications (700mA AC / 1A DC vs. 500mA, and 20W vs. 10W) while maintaining SPST-NO circuit configuration and Through Hole mounting. The part is mechanically compatible with existing Through Hole designs. The higher ratings provide increased margin without introducing incompatibility.

Q: What are the key electrical differences between these parts? A: All three parts share SPST-NO configuration and 140V AC / 200V DC voltage ratings. Current and power ratings increase from the main part (500mA, 10W) to the substitutes (RI-07GP-2025: 500mA, 10W; MLRR-3-17-23: 700mA/1A, 20W). Operating temperature ranges differ slightly, with MLRR-3-17-23 rated to -40°C minimum versus -55°C for the others.

Q: Does operate range compatibility matter? A: The operate range specifies the magnetic field strength required to activate the switch. RI-01CA operates at 16 ~ 25AT. RI-07GP-2025 operates at 20 ~ 25AT, requiring a stronger magnetic field. MLRR-3-17-23 operates at 17 ~ 23AT. Substitution is valid only if the application's magnetic field strength falls within the substitute part's operate range.

Q: Are there any compliance or regulatory differences? A: All parts are RoHS-compliant. The RI-01CA is RoHS Compliant (RoHS 2), while both substitutes are ROHS3 Compliant (RoHS 3), which represents a more recent standard with additional restricted substances. Both substitutes are REACH Unaffected and EAR99 classified, matching the RI-01CA.

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