MDCG-4-17-33 Equivalent & Substitute Parts

Part Overview

The MDCG-4-17-33 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This through-hole mounted component is designed for low-power switching applications requiring reliable contact closure across a wide operating temperature range. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for the application.

Substiute Parts

MDCG-4-17-33

Littelfuse Inc.In Stock: 1061MDCG-4-17-33 Datasheet

Current PartRFQ

KSK-1A35-1015

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDCG-4-17-33 is determined by the following critical parameters:

• Circuit configuration must remain SPST-NO
• Current switching capability must meet or exceed 350 mA (AC) and 500 mA (DC)
• Voltage switching capability must meet or exceed 140 V (AC) and 200 V (DC)
• Rated power must meet or exceed 10 W
• Operating temperature range must encompass or exceed -40°C ~ 125°C
• Product status must be Active
• RoHS3 compliance is required

The substitute part KSK-1A35-1015 meets these criteria with enhanced electrical performance characteristics. However, the mounting type differs from the main part (Surface Mount vs. Through Hole), which represents a mechanical incompatibility for direct board-level substitution without design modification.

Parameter Comparison

Engineering Selection Recommendations

Both the MDCG-4-17-33 and KSK-1A35-1015 maintain Active product status with full RoHS3 compliance and REACH unaffected designation. The KSK-1A35-1015 provides superior electrical performance with doubled current switching capacity (1 A vs. 350/500 mA) and increased rated power (20 W vs. 10 W), along with improved response times. The operating temperature range of the substitute extends to 130°C, exceeding the main part specification.

The primary constraint for substitution is the mounting technology difference. The MDCG-4-17-33 is configured for through-hole mounting, while the KSK-1A35-1015 is surface mount. Direct substitution on existing PCB layouts designed for through-hole components is not feasible without board redesign or the use of mechanical adapters.

Frequently Asked Questions (FAQ)

Q: Can the KSK-1A35-1015 replace the MDCG-4-17-33 in an existing circuit?

A: Electrical substitution is valid based on parameter compatibility. The KSK-1A35-1015 exceeds all critical electrical specifications (current, voltage, power). However, the mounting type difference (Surface Mount vs. Through Hole) prevents direct board-level substitution without PCB modification or mechanical adaptation.

Q: What are the key electrical differences between these parts?

A: The KSK-1A35-1015 provides higher current switching capacity (1 A vs. 350/500 mA), increased rated power (20 W vs. 10 W), and faster response times (0.5 ms operate, 0.1 ms release vs. 0.6 ms operate, 0.2 ms release). Both maintain identical DC switching voltage (200 V) and equivalent AC voltage performance.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the MDCG-4-17-33 and KSK-1A35-1015 are RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1). The KSK-1A35-1015 additionally carries REACH unaffected status.

Q: What is the operate range specification, and how does it affect substitution?

A: Operate range specifies the magnetic field strength (in Ampere-Turns, AT) required to close the reed switch contacts. The MDCG-4-17-33 requires 17 ~ 33 AT, while the KSK-1A35-1015 requires 10 ~ 15 AT. Lower operate range indicates higher sensitivity. Application compatibility depends on the magnetic field strength available in the specific circuit design.

Q: Can packaging differences affect substitution decisions?

A: Yes. The MDCG-4-17-33 is supplied in bulk through-hole format, while the KSK-1A35-1015 is surface mount. Packaging and mounting type must align with PCB design specifications and assembly capabilities.