RI-70CTA Glass Body Reed Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The RI-70CTA 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 120V AC and 170V DC. This component is rated for 10W power dissipation with an operate range of 7 to 14AT and features through-hole axial termination suitable for PCB integration.

The RI-70CTA is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this reed switch.

Substiute Parts

RI-70CTA

Comus InternationalIn Stock: 941RI-70CTA Datasheet

Current PartRFQ

RI-70GP0710

Comus InternationalIn Stock: 41859RI-70GP0710 Datasheet

SimilarRFQ

MDCG-4-7-13

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RI-70CTA is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Circuit configuration (SPST-NO)
• Switching current capacity (500mA minimum for AC/DC operation)
• Switching voltage ratings (120V AC / 170V DC minimum)
• Rated power (10W)
• Mounting type (Through Hole)
• Termination style (Axial)
• Operating temperature range compatibility (-55°C ~ 125°C)

Secondary Compatibility Factors:

• Operate range overlap (7 ~ 14AT for RI-70CTA)
• Response time characteristics (operate and release times)
• Physical dimensions and body size
• Compliance certifications (RoHS, REACH)

Two substitute parts meet the core electrical and mechanical requirements of the RI-70CTA:

1. RI-70GP0710 (Comus International) - Same series, active product status, identical electrical ratings
2. MDCG-4-7-13 (Littelfuse Inc.) - Cross-manufacturer equivalent with comparable electrical performance

Parameter Comparison

Engineering Selection Recommendations

RI-70GP0710 (Recommended Primary Substitute)

The RI-70GP0710 is the preferred substitute for the obsolete RI-70CTA. Both components share identical electrical specifications (500mA switching current, 120V AC / 170V DC switching voltage, 10W rated power) and mechanical characteristics (through-hole axial termination, identical body dimensions, matching response times). The RI-70GP0710 is manufactured by the same supplier (Comus International) within the same RI-70 series, ensuring design compatibility. The component holds active product status with substantial inventory availability (41,822 pcs), providing supply chain continuity. Both components meet RoHS3 compliance and REACH unaffected status. The operate range of RI-70GP0710 (7 ~ 10AT) is a subset of the RI-70CTA (7 ~ 14AT), making it suitable for applications within the 7 ~ 10AT threshold.

MDCG-4-7-13 (Alternative Cross-Manufacturer Substitute)

The MDCG-4-7-13 manufactured by Littelfuse Inc. serves as a cross-manufacturer alternative when RI-70GP0710 is unavailable. This component maintains SPST-NO circuit configuration, through-hole axial termination, and 10W rated power. The MDCG-4-7-13 offers higher switching voltage ratings (140V AC / 200V DC) and superior DC carry current (1.2A versus 400mA), providing enhanced electrical margin. However, the AC switching current is limited to 350mA, which is below the RI-70CTA specification of 500mA. The operate range (7 ~ 13AT) overlaps substantially with the RI-70CTA. Physical dimensions differ (1.590" overall length versus 1.811"), requiring PCB layout verification. Response times are slower (0.6 ms operate, 0.2 ms release versus 0.15 ms and 0.03 ms). The operating temperature minimum is -40°C, which is higher than the RI-70CTA specification of -55°C. The MDCG-4-7-13 holds active product status with ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can RI-70GP0710 directly replace RI-70CTA in all applications?

A: RI-70GP0710 is electrically and mechanically compatible with RI-70CTA for applications requiring operate ranges between 7 and 10AT. The RI-70CTA specifies an operate range of 7 ~ 14AT. Applications requiring magnetic field strengths above 10AT cannot use RI-70GP0710. Verify the magnetic field strength requirement of your application before substitution.

Q: What are the limitations of MDCG-4-7-13 as a substitute?

A: MDCG-4-7-13 has three key limitations: (1) AC switching current is 350mA, below the RI-70CTA specification of 500mA AC/DC; (2) operating temperature minimum is -40°C versus RI-70CTA at -55°C, unsuitable for cryogenic applications; (3) physical dimensions differ, requiring PCB layout verification for through-hole mounting compatibility.

Q: Are there packaging differences between these substitutes?

A: RI-70CTA packaging is listed as "-" (unspecified). RI-70GP0710 is supplied in Bulk packaging. MDCG-4-7-13 is supplied in Bulk packaging. Confirm packaging requirements with your procurement specifications.

Q: Do all three components meet current environmental compliance standards?

A: RI-70CTA is RoHS Compliant. Both RI-70GP0710 and MDCG-4-7-13 are ROHS3 Compliant, representing updated compliance certification. All three components are REACH Unaffected. Both substitutes meet or exceed the compliance status of the obsolete RI-70CTA.

Q: What is the primary difference in response time between RI-70CTA and MDCG-4-7-13?

A: RI-70CTA operates with 0.15 ms operate time and 0.03 ms release time. MDCG-4-7-13 operates with 0.6 ms operate time and 0.2 ms release time. Applications requiring fast switching response should use RI-70GP0710 or RI-70CTA, not MDCG-4-7-13.

Q: Can MDCG-4-7-13 be used in applications requiring 500mA AC switching current?

A: No. MDCG-4-7-13 is rated for 350mA AC switching current, which is insufficient for applications requiring 500mA AC operation. Use RI-70GP0710 for 500mA AC/DC switching current requirements.

Q: Are the body dimensions critical for PCB layout?

A: Yes. RI-70CTA and RI-70GP0710 share identical body dimensions (0.071" Dia x 0.276" L). MDCG-4-7-13 has larger body dimensions (0.090" Dia x 0.600" L). Verify PCB footprint and clearance requirements before selecting MDCG-4-7-13 as a substitute.