MDSR-4-17-28 Equivalent & Substitute Parts

Part Overview

The MDSR-4-17-28 is a glass body reed switch manufactured by Littelfuse Inc., configured as a single-pole single-throw normally open (SPST-NO) device. This component is designed for applications requiring low-power switching with a 500mA DC switching capacity and 10W rated power. The part is currently in active production status with 841 units available in inventory. Substitute parts are identified when equivalent functional performance can be maintained within the specified electrical and mechanical parameter ranges for this reed switch category.

Substiute Parts

MDSR-4-17-28

Littelfuse Inc.In Stock: 890MDSR-4-17-28 Datasheet

Current PartRFQ

MDCG-4-17-28

Littelfuse Inc.In Stock: 1540MDCG-4-17-28 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDSR-4-17-28 is determined by strict equivalence across the following critical parameters:

Circuit configuration must remain SPST-NO to maintain functional compatibility with existing circuit designs. The operate range of 17 ~ 28AT establishes the magnetic sensitivity threshold and must be preserved. Switching current capacity (500mA DC) and switching voltage (200V DC) define the maximum load-handling capability and cannot be reduced. Rated power (10W) establishes the thermal dissipation limit. Mounting type (Through Hole) and termination style (Axial) ensure mechanical compatibility with printed circuit board layouts. Operating temperature range (-40°C ~ 125°C) must be maintained or exceeded. RoHS3 compliance and active product status are required for current procurement.

The MDCG-4-17-28 meets all these criteria and is identified as the manufacturer-recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the MDSR-4-17-28 and MDCG-4-17-28 are active products from Littelfuse Inc. with identical electrical and mechanical specifications. Both components maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Selection between these parts may be based on inventory availability, supply chain considerations, or design documentation requirements. The MDCG-4-17-28 currently has higher inventory availability (1477 units versus 841 units for the MDSR-4-17-28).

Frequently Asked Questions (FAQ)

Q: Can the MDCG-4-17-28 be used as a direct replacement for the MDSR-4-17-28?

A: Yes. Both parts share identical electrical specifications (500mA DC switching current, 200V DC switching voltage, 10W rated power), identical magnetic operate range (17 ~ 28AT), identical mechanical dimensions, and identical mounting configuration (Through Hole, Axial termination). Both are ROHS3 compliant and active products.

Q: Are there differences in AC switching capability between these parts?

A: The MDCG-4-17-28 includes AC switching specification (350mA AC at 140V AC), while the MDSR-4-17-28 specification provided does not include AC parameters. For DC-only applications, this difference is not relevant. For applications requiring AC switching capability, the MDCG-4-17-28 provides additional functionality.

Q: Do these parts have identical physical dimensions?

A: Yes. Both parts have identical overall length (1.590" / 40.39mm), body diameter (0.090" / 2.28mm), and body length (0.600" / 15.24mm). They are mechanically interchangeable in Through Hole PCB layouts.

Q: What is the operating temperature range for both parts?

A: Both the MDSR-4-17-28 and MDCG-4-17-28 operate across the temperature range of -40°C to 125°C.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component use in regulated markets.