FR2S1020 Equivalent & Substitute Parts

Part Overview

The FR2S1020 is a glass body reed switch manufactured by Coto Technology, configured as a single-pole single-throw normally open (SPST-NO) device. This component operates at 500mA switching current with 200V AC/DC rating and 10VA power capacity. The FR2S1020 is classified as obsolete, necessitating identification of active equivalent components for ongoing design requirements and production continuity.

Substiute Parts

FR2S1020

Coto TechnologyIn Stock: 914FR2S1020 Datasheet

Current PartRFQ

MDSR-4-12-23

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

SimilarRFQ

MDSR-7-10-20

Littelfuse Inc.In Stock: 44222MDSR-7-10-20 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FR2S1020 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Circuit configuration must be SPST-NO
• Switching current must support 500mA minimum
• Voltage rating must support 200V DC operation
• Operating temperature range must encompass -40°C to 125°C
• Glass body reed switch type

Secondary Considerations:

• Operate range overlap (10 ~ 20AT for FR2S1020)
• Power rating compatibility
• Switching time performance
• RoHS and REACH compliance status

The identified substitute parts MDSR-4-12-23 and MDSR-7-10-20 from Littelfuse Inc. meet the core electrical requirements but differ in mounting type (Through Hole versus Surface Mount) and specific voltage/current operating ranges. These differences require engineering evaluation based on application-specific constraints.

Parameter Comparison

Engineering Selection Recommendations

MDSR-7-10-20 (Littelfuse Inc.) provides the closest functional alignment to the FR2S1020:

• Identical operate range (10 ~ 20AT)
• Matching DC switching voltage (200V)
• Equivalent capacitance (0.3 pF)
• Active product status with ROHS3 compliance
• Through Hole mounting requires PCB redesign from Surface Mount configuration

MDSR-4-12-23 (Littelfuse Inc.) offers alternative compatibility:

• Higher operate range (12 ~ 23AT) with partial overlap
• Matching DC switching voltage (200V)
• DC-only switching current specification (500mA DC)
• Active product status with ROHS3 compliance
• Through Hole mounting requires PCB redesign from Surface Mount configuration
• No AC voltage rating specification

Both substitute parts are active products with current manufacturing support and enhanced RoHS compliance (ROHS3). Selection between these options depends on application-specific requirements for operate range tolerance and AC/DC voltage operation. Mounting type conversion from Surface Mount to Through Hole requires circuit board layout modification.

Frequently Asked Questions (FAQ)

Q: Can the MDSR-7-10-20 directly replace the FR2S1020 without circuit modification?

A: The MDSR-7-10-20 meets the core electrical specifications (500mA DC switching current, 200V DC voltage, 10 ~ 20AT operate range). However, mounting type differs: FR2S1020 is Surface Mount while MDSR-7-10-20 is Through Hole. PCB footprint and assembly process changes are required.

Q: What is the key difference between MDSR-4-12-23 and MDSR-7-10-20?

A: MDSR-4-12-23 operates at 12 ~ 23AT (higher threshold) and supports DC-only switching at 500mA. MDSR-7-10-20 operates at 10 ~ 20AT (matching FR2S1020) and supports both AC (350mA) and DC (500mA) switching. MDSR-7-10-20 provides broader voltage compatibility with 140V AC rating.

Q: Is the FR2S1020 still available for procurement?

A: The FR2S1020 is classified as obsolete. Current inventory of 807 pieces exists in stock, but long-term availability is not guaranteed. Active substitute parts from Littelfuse Inc. are recommended for new designs and production continuity.

Q: Do the substitute parts meet the same compliance standards?

A: Both MDSR-4-12-23 and MDSR-7-10-20 are ROHS3 compliant and REACH unaffected, meeting or exceeding the FR2S1020 RoHS compliance status. Moisture Sensitivity Level remains 1 (Unlimited) across all three parts.

Q: What is the impact of switching time differences?

A: FR2S1020 operates at 0.5 ms, while both substitutes operate at 0.6 ms. This 0.1 ms difference is negligible for most applications but should be verified for time-critical switching circuits.

Q: Can the FR2S1020 be used in AC applications with the substitute parts?

A: FR2S1020 supports 200V AC switching. MDSR-7-10-20 supports 140V AC switching (reduced rating). MDSR-4-12-23 has no AC specification. For AC applications at 200V, MDSR-7-10-20 requires voltage derating or circuit redesign.