M2018SD4G02 Equivalent & Substitute Parts

Part Overview

The M2018SD4G02 is a toggle switch manufactured by NKK Switches, classified as a SPDT (Single Pole Double Throw) panel mount switch with a current rating of 0.4VA at 28V AC/DC. The switch features a momentary-off-momentary (Mom-Off-Mom) function with a standard round actuator and quick connect termination. This part is currently listed as obsolete, necessitating identification of active equivalent models to maintain design continuity and ensure ongoing component availability for production and maintenance applications.

Substiute Parts

M2018SD4G02

NKK SwitchesIn Stock: 984M2018SD4G02 Datasheet

Current PartRFQ

M2018SD1G01

NKK SwitchesIn Stock: 1156M2018SD1G01 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M2018SD4G02 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence: Circuit configuration (SPDT), switch function (Mom-Off-Mom), current rating (0.4VA AC/DC), and voltage ratings (28V AC and DC) must remain identical.

Mechanical Equivalence: Mounting type (panel mount), actuator type (standard round), actuator length (10.50mm), and panel cutout dimensions (circular 6.50mm diameter) must be preserved to ensure physical compatibility with existing panel designs.

Environmental and Operational Equivalence: Operating temperature range (-30°C ~ 85°C), electrical life (50,000 cycles), and RoHS compliance status must match.

Termination Consideration: While termination style may differ between the main part and substitutes, the electrical and mechanical interfaces must support direct functional replacement within the application circuit.

The M2018SD1G01 qualifies as a substitute based on full alignment with all critical electrical, mechanical, and environmental parameters, despite differences in termination style and bushing thread specification.

Parameter Comparison

Engineering Selection Recommendations

The M2018SD1G01 is the manufacturer-recommended substitute for the obsolete M2018SD4G02. Both parts maintain identical electrical performance specifications, mechanical form factors, and environmental operating parameters. The M2018SD1G01 carries active product status, ensuring continued availability and supply chain reliability.

Both parts are RoHS compliant and share the same base product number (M2018SD), confirming functional equivalence within the NKK Switches M series toggle switch family. The primary differences—termination style (quick connect versus solder lug) and bushing thread specification (M6 x 0.75 versus 1/4-40)—represent design variations that do not affect electrical or core mechanical compatibility when properly integrated into the application circuit.

Selection of the M2018SD1G01 eliminates obsolescence risk while maintaining full functional parity with the original M2018SD4G02 specification.

Frequently Asked Questions (FAQ)

Q: Can the M2018SD1G01 directly replace the M2018SD4G02 in existing designs?

A: The M2018SD1G01 provides electrical and mechanical equivalence across all critical parameters. The primary consideration is termination style: the M2018SD4G02 uses quick connect terminals, while the M2018SD1G01 uses solder lug termination. Circuit integration must accommodate this termination difference.

Q: Are the panel cutout dimensions identical between these parts?

A: Yes. Both parts require a circular panel cutout of 6.50mm diameter, ensuring mechanical compatibility with existing panel designs.

Q: What is the significance of the different bushing thread specifications?

A: The M2018SD4G02 uses M6 x 0.75 metric threading, while the M2018SD1G01 uses 1/4-40 UNC threading. Panel mounting hardware and bushing selection must correspond to the chosen part's thread specification.

Q: Do both parts meet the same environmental and operational standards?

A: Yes. Both parts operate across the identical temperature range (-30°C ~ 85°C), maintain 50,000 electrical life cycles, and are RoHS compliant.

Q: Why is the M2018SD4G02 listed as obsolete?

A: The M2018SD4G02 has been superseded by the M2018SD1G01 within the NKK Switches product portfolio. The M2018SD1G01 maintains full functional equivalence while offering active production status and ongoing supply availability.

Q: Are there inventory considerations when selecting between these parts?

A: The M2018SD1G01 is currently in active production with 1,071 units in stock, while the M2018SD4G02 is obsolete with limited remaining inventory (877 units). For new designs and ongoing production, the M2018SD1G01 is the appropriate selection.