MDCG-4-17-23 Equivalent & Substitute Parts

Part Overview

The MDCG-4-17-23 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) contact arrangement. This through-hole mounted component is designed for low-power switching applications with a rated power of 10W and switching current capacity of 350mA (AC) / 500mA (DC) at 140V AC / 200V DC. The component is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when design requirements permit variations in mounting type, switching current capacity, voltage rating, or operate/release timing characteristics while maintaining functional compatibility within the SPST-NO reed switch category.

Substiute Parts

MDCG-4-17-23

Littelfuse Inc.In Stock: 712MDCG-4-17-23 Datasheet

Current PartRFQ

KSK-1A35-1015

Standex-Meder ElectronicsIn Stock: 3690KSK-1A35-1015 Datasheet

MFR RecommendedRFQ

KSK-1A66-1520

Standex-Meder ElectronicsIn Stock: 1882KSK-1A66-1520 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDCG-4-17-23 are identified from the Standex-Meder Electronics KSK series based on the following substitution criteria:

Primary Compatibility Parameters:

• Circuit configuration: SPST-NO (maintained across all substitutes)
• Component type: Glass body reed switch (maintained across all substitutes)
• RoHS compliance: ROHS3 Compliant (maintained across all substitutes)
• Product status: Active (maintained across all substitutes)

Allowable Variation Parameters:

• Mounting type: Through hole or surface mount configurations
• Switching current capacity: 350mA to 1A range
• Voltage rating: 140V to 200V range
• Operate range: 10AT to 23AT
• Power rating: 10W to 20W
• Operating temperature: -40°C to 125°C or higher

The KSK-1A35-1015 and KSK-1A66-1520 are qualified substitutes when application requirements permit surface mount or through-hole mounting alternatives, higher current handling capacity, or enhanced voltage ratings compared to the original MDCG-4-17-23 specification.

Parameter Comparison

Engineering Selection Recommendations

KSK-1A35-1015 Substitution Suitability: This surface-mount alternative provides enhanced switching current capacity (1A AC/DC) and voltage rating (200V AC/DC) compared to the MDCG-4-17-23. The KSK-1A35-1015 is suitable for applications where the original through-hole mounting constraint can be accommodated by surface-mount technology, and where the higher current and voltage specifications provide design margin. Both components maintain ROHS3 compliance and active product status. The faster release time (0.1 ms vs. 0.2 ms) and higher power rating (20W vs. 10W) represent performance enhancements.

KSK-1A66-1520 Substitution Suitability: This through-hole alternative maintains the same mounting type as the MDCG-4-17-23 while providing equivalent switching current capacity (500mA AC/DC) and comparable voltage rating (180V AC/DC). The KSK-1A66-1520 is directly compatible with existing through-hole PCB layouts. Both components maintain ROHS3 compliance and active product status. The faster operate and release times (0.5 ms and 0.1 ms respectively) represent performance improvements over the original specification.

Frequently Asked Questions (FAQ)

Q: Can the KSK-1A35-1015 be used as a direct replacement for the MDCG-4-17-23?

A: The KSK-1A35-1015 is functionally equivalent in circuit configuration (SPST-NO) and component type (glass body reed switch). However, it requires surface-mount PCB layout and assembly processes, whereas the MDCG-4-17-23 uses through-hole mounting. Substitution is valid only when the application design permits surface-mount implementation.

Q: What are the key differences between the two substitute parts?

A: The KSK-1A35-1015 is surface-mount with higher current capacity (1A) and power rating (20W), while the KSK-1A66-1520 is through-hole mounted with 500mA switching current matching the DC rating of the original part. The KSK-1A66-1520 provides a more direct form-factor replacement for through-hole applications.

Q: Are all three parts compliant with the same regulatory standards?

A: Yes. The MDCG-4-17-23, KSK-1A35-1015, and KSK-1A66-1520 all carry ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification. All three maintain MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the significance of the operate and release range specifications?

A: The operate range (measured in Ampere-Turns, AT) defines the magnetic field strength required to close the reed switch contacts. The MDCG-4-17-23 requires 17-23AT, while substitutes require 10-15AT (KSK-1A35-1015) or 15-20AT (KSK-1A66-1520). Substitution is valid only when the magnetic actuation source in the application can provide the required operate range for the selected substitute part.

Q: Can these parts be used interchangeably in existing designs?

A: Interchangeability depends on specific application requirements. The KSK-1A66-1520 offers the highest compatibility for through-hole designs due to matching mounting type and similar electrical specifications. The KSK-1A35-1015 requires design modification to accommodate surface-mount technology but offers enhanced electrical performance margins.