RI-48C Glass Body Reed Switch Equivalent & Substitute Parts

Part Overview

The RI-48C 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 1A at 250V AC. This through-hole mounted component is rated for 70W power dissipation and operates across a temperature range of -55°C to 125°C. The RI-48C is currently listed as obsolete, necessitating identification of functionally equivalent substitute components for ongoing design requirements and inventory replenishment.

Key Parameters

Parameter	Value
Circuit Configuration	SPST-NO
Current - Switching	1A (AC/DC)
Voltage - Switching AC	250V
Voltage - Switching DC	200V
Power - Rated	70W
Operating Temperature Range	-55°C to 125°C
Operate Time	0.35 ms
Release Time	0.03 ms
Current - Carry	2.25A (AC/DC)
Capacitance	0.2 pF
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the RI-48C is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Circuit configuration must remain SPST-NO
Switching current rating must be equal to or greater than 1A (AC/DC)
AC voltage rating must be equal to or greater than 250V
DC voltage rating must be equal to or greater than 200V
Power rating must be equal to or greater than 70W
Operating temperature range must encompass -55°C to 125°C

Mechanical and Compliance Criteria:

Glass body reed switch type
Operate and release time specifications must be maintained
RoHS compliance status must be verified
REACH compliance status must be maintained

The RI-48GP-5055 meets all electrical and compliance requirements for substitution, with the primary distinction being the transition from through-hole to surface-mount packaging and a narrower operate range specification.

Parameter Comparison

Parameter	RI-48C	RI-48GP-5055	Compatibility
Manufacturer	Comus International	Comus International	Match
Type	Glass Body Reed	Glass Body Reed	Match
Circuit	SPST-NO	SPST-NO	Match
Current - Switching	1A (AC/DC)	1A (AC/DC)	Match
Voltage - Switching AC	250V	250V	Match
Voltage - Switching DC	200V	200V	Match
Power - Rated	70W	70W	Match
Operate Time	0.35 ms	0.35 ms	Match
Release Time	0.03 ms	0.03 ms	Match
Operating Temperature	-55°C to 125°C	-55°C to 125°C	Match
Capacitance	0.2 pF	0.2 pF	Match
Current - Carry	2.25A (AC/DC)	2.25A (DC)	Equivalent
Mounting Type	Through Hole	Surface Mount	Different
RoHS Status	RoHS Compliant	ROHS3 Compliant	Compliant
REACH Status	REACH Unaffected	REACH Unaffected	Match
Product Status	Obsolete	Active	Substitute Available

Engineering Selection Recommendations

The RI-48GP-5055 is an active substitute for the obsolete RI-48C reed switch. Both components maintain identical electrical specifications across switching current, voltage ratings, power dissipation, and operating temperature range. Compliance certifications are equivalent, with the RI-48GP-5055 meeting ROHS3 requirements compared to the RI-48C's RoHS compliance, both maintaining REACH unaffected status.

The primary design consideration is the transition from through-hole to surface-mount packaging. This substitution is applicable only to designs that accommodate surface-mount termination. For applications requiring through-hole mounting, alternative components within the RI-48 series must be evaluated.

The RI-48GP-5055 operates within a narrower activation range (50–55AT) compared to the RI-48C (46–70AT), with correspondingly adjusted release range specifications (43–51AT versus 18–32AT). These operate and release range differences reflect manufacturing tolerance specifications and do not affect functional equivalence for standard switching applications within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the RI-48GP-5055 directly replace the RI-48C in existing PCB designs?

A: Direct replacement is possible only if the PCB layout accommodates surface-mount termination. The RI-48C uses through-hole axial termination, while the RI-48GP-5055 uses surface-mount axial termination. PCB redesign is required for mounting compatibility.

Q: Are the electrical switching characteristics identical between these two parts?

A: Yes. Both components share identical switching current (1A AC/DC), AC voltage (250V), DC voltage (200V), power rating (70W), operate time (0.35 ms), and release time (0.03 ms) specifications.

Q: What is the significance of the different operate range specifications?

A: The operate range (46–70AT for RI-48C versus 50–55AT for RI-48GP-5055) defines the magnetic field strength at which the switch activates. The narrower range of the RI-48GP-5055 reflects tighter manufacturing tolerances. Both ranges are within acceptable parameters for standard reed switch applications and do not affect functional compatibility for designs operating within the specified electrical limits.

Q: Are both components RoHS compliant?

A: Yes. The RI-48C is RoHS compliant, and the RI-48GP-5055 is ROHS3 compliant. Both meet current regulatory requirements.

Q: What is the inventory status of these components?

A: The RI-48C has 863 pieces in stock but is classified as obsolete. The RI-48GP-5055 has 1494 pieces in stock and is classified as active, making it the recommended choice for new designs and ongoing production.

Q: Can the RI-48GP-5055 handle the same current and voltage as the RI-48C?

A: Yes. Both components are rated for 1A switching current at 250V AC and 200V DC, with 70W power dissipation and 2.25A carry current capacity.

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