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M2018SS1W01-BA Toggle Switch SPDT Equivalent & Substitute Parts
Part Overview
The M2018SS1W01-BA is an NKK Switches toggle switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 6A at 125V AC and 3A at 30V DC. This component features a momentary-off-momentary (Mom-Off-Mom) switch function with panel mount installation and solder lug termination. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | M2018SS1W01-BA |
| Manufacturer | NKK Switches |
| Circuit Configuration | SPDT |
| Switch Function | Mom-Off-Mom |
| Current Rating (AC) | 6A |
| Current Rating (DC) | 3A |
| Voltage Rating (AC) | 125V |
| Voltage Rating (DC) | 30V |
| Mounting Type | Panel Mount |
| Termination Style | Solder Lug |
| Panel Cutout Diameter | 6.50mm |
| Bushing Thread | 1/4-40 |
| Operating Temperature Range | -30°C to 85°C |
| Electrical Life | 25,000 Cycles |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the M2018SS1W01-BA is determined by the following critical parameters:
Primary Compatibility Criteria:
- Circuit configuration: SPDT
- Switch function: Mom-Off-Mom
- Mounting type: Panel Mount
- Termination style: Solder Lug
- Panel cutout diameter: 6.35mm or 6.50mm (circular)
- Bushing thread: 1/4-40
- Operating temperature range: -30°C to 85°C minimum
Electrical Performance Criteria:
- Current rating: Minimum 5A AC/DC (original part rated 6A AC / 3A DC)
- Voltage rating: Minimum 120V AC / 28V DC (original part rated 125V AC / 30V DC)
Compliance Criteria:
- RoHS3 compliance preferred for new designs
- REACH status noted for regulatory tracking
Substitute parts from C&K Electronics (7000 series) meet the mechanical and electrical compatibility requirements. The MN18SS1W01-BA from NKK Switches serves as the manufacturer-recommended equivalent. Parts with reduced electrical ratings (7105L2PHZBE at 0.4VA / 20V) are not suitable for applications requiring the full 6A / 125V performance envelope.
Parameter Comparison
| Parameter | M2018SS1W01-BA (Main) | MN18SS1W01-BA | 7105L1PH3ZQE | 7105L1PH3ZQI | 7105L1PY1ZGE | 7105L3H3ZQE2 | 7105L41H3ZQE2 | 7105L41H3ZQE22 | 7105LH3ZQE2 | 7105LHZQE2 |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | NKK Switches | NKK Switches | C&K | C&K | C&K | C&K | C&K | C&K | C&K | C&K |
| Circuit | SPDT | SPDT | SPDT | SPDT | SPDT | SPDT | SPDT | SPDT | SPDT | SPDT |
| Switch Function | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom | Mom-Off-Mom |
| Current Rating | 6A (AC), 3A (DC) | Not specified | 5A (AC/DC) | 5A (AC/DC) | 5A (AC/DC) | 5A (AC/DC) | 5A (AC/DC) | 5A (AC/DC) | 5A (AC/DC) | 5A (AC/DC) |
| Voltage Rating (AC) | 125V | Not specified | 120V | 120V | 120V | 120V | 120V | 120V | 120V | 120V |
| Voltage Rating (DC) | 30V | Not specified | 28V | 28V | 28V | 28V | 28V | 28V | 28V | 28V |
| Mounting Type | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount |
| Termination Style | Solder Lug | Solder Lug | Solder Lug | Solder Lug | Solder Lug | Solder Lug | Solder Lug | Solder Lug | Solder Lug | Solder Lug |
| Panel Cutout Diameter | 6.50mm | Not specified | 6.35mm | 6.35mm | 6.35mm | 6.35mm | 6.35mm | 6.35mm | 6.35mm | 6.35mm |
| Bushing Thread | 1/4-40 | 1/4-40 | 1/4-40 | 1/4-40 | 1/4-40 | 1/4-40 | 1/4-40 | 1/4-40 | 1/4-40 | 1/4-40 |
| Operating Temperature | -30°C to 85°C | Not specified | -30°C to 85°C | -30°C to 85°C | -30°C to 85°C | -30°C to 85°C | -30°C to 85°C | -30°C to 85°C | -30°C to 85°C | -30°C to 85°C |
| Electrical Life | 25,000 Cycles | Not specified | 40,000 Cycles | 40,000 Cycles | 40,000 Cycles | 40,000 Cycles | 40,000 Cycles | 40,000 Cycles | 40,000 Cycles | 40,000 Cycles |
| RoHS Status | ROHS3 Compliant | Not specified | ROHS3 Compliant | RoHS non-compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Recommendation: MN18SS1W01-BA
The MN18SS1W01-BA is the manufacturer-recommended equivalent from NKK Switches. As an active product from the original manufacturer, this part provides direct compatibility with the obsolete M2018SS1W01-BA. Selection of this part eliminates design re-qualification requirements and maintains consistency with the original component family.
Secondary Recommendations: C&K 7000 Series (5A / 120V Rating)
The following C&K parts meet mechanical and electrical compatibility criteria:
- 7105L1PH3ZQE (ROHS3 Compliant, Epoxy Sealed Terminals)
- 7105L1PH3ZQI (RoHS non-compliant, Epoxy Potted)
- 7105L1PY1ZGE (RoHS non-compliant, Epoxy Sealed Terminals)
- 7105L3H3ZQE2 (ROHS3 Compliant, Black Actuator)
- 7105L41H3ZQE2 (ROHS3 Compliant, Flat Anti-Rotation Actuator)
- 7105L41H3ZQE22 (ROHS3 Compliant, Flat Anti-Rotation Actuator)
- 7105LH3ZQE2 (ROHS3 Compliant, Extended Actuator Length)
- 7105LHZQE2 (RoHS non-compliant, Extended Actuator Length)
For new designs requiring RoHS3 compliance, select from: 7105L1PH3ZQE, 7105L3H3ZQE2, 7105L41H3ZQE2, 7105L41H3ZQE22, or 7105LH3ZQE2.
Not Recommended: 7105L2PHZBE
The 7105L2PHZBE operates at 0.4VA / 20V, which is insufficient for applications requiring the original part's 6A / 125V performance envelope. This part is suitable only for low-power signal switching applications.
Electrical Performance Note
C&K 7000 series substitutes are rated at 5A AC/DC and 120V AC / 28V DC, which is slightly lower than the original M2018SS1W01-BA specification (6A AC / 3A DC at 125V AC / 30V DC). Applications operating at or near the original part's maximum ratings require verification that the 5A / 120V substitute rating is acceptable for the intended circuit.
Frequently Asked Questions (FAQ)
Q: Can the MN18SS1W01-BA directly replace the M2018SS1W01-BA?
A: Yes. The MN18SS1W01-BA is the manufacturer-recommended equivalent and is the preferred replacement for the obsolete M2018SS1W01-BA. Both parts are from NKK Switches and maintain the same mechanical interface and functional characteristics.
Q: What is the difference between the C&K 7000 series substitutes?
A: The C&K 7000 series parts differ in actuator type, actuator length, and terminal sealing method. 7105L1 variants feature anti-rotation actuators; 7105L3 and 7105L4 variants feature standard round or flat anti-rotation actuators with black coloring; 7105LH variants feature extended actuator lengths. Terminal sealing varies between epoxy sealed and epoxy potted configurations. All maintain the same SPDT Mom-Off-Mom circuit function, 5A / 120V electrical rating, and 1/4-40 panel mount interface.
Q: Are there mechanical compatibility issues with the 6.35mm cutout diameter of C&K parts versus the 6.50mm cutout of the original?
A: The 0.15mm difference in panel cutout diameter is within standard manufacturing tolerances for panel mount switches. Existing panel cutouts designed for the 6.50mm M2018SS1W01-BA will accommodate the 6.35mm C&K parts without modification. Both use the same 1/4-40 bushing thread for secure panel mounting.
Q: Which substitute part should I select for new designs?
A: For new designs, the MN18SS1W01-BA is the primary choice. If MN18SS1W01-BA availability is limited, select from C&K 7000 series parts with ROHS3 compliance: 7105L1PH3ZQE, 7105L3H3ZQE2, 7105L41H3ZQE2, 7105L41H3ZQE22, or 7105LH3ZQE2. Verify that the 5A / 120V electrical rating meets your circuit requirements.
Q: What is the impact of the electrical life difference (25,000 cycles vs. 40,000 cycles)?
A: The C&K 7000 series substitutes provide extended electrical life (40,000 cycles) compared to the original M2018SS1W01-BA (25,000 cycles). This represents improved durability and is not a limitation for substitution. Applications with high cycle count requirements benefit from this enhanced specification.
Q: Can I use the 7105L2PHZBE as a substitute?
A: No. The 7105L2PHZBE is rated at 0.4VA / 20V, which is insufficient for applications requiring the M2018SS1W01-BA's 6A / 125V performance. This part is suitable only for low-power signal switching and is not electrically compatible with the original design.
Q: What is the difference between ROHS3 compliant and RoHS non-compliant parts?
A: ROHS3 compliant parts meet the Restriction of Hazardous Substances Directive and are required for applications subject to EU regulations or customer specifications mandating RoHS compliance. RoHS non-compliant parts may contain restricted substances and are suitable only for applications without RoHS requirements. For new designs, ROHS3 compliant parts are recommended.
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