CTS Electrocomponents 209-7MST DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The CTS Electrocomponents 209-7MST is a 7-position DIP switch with SPST circuit configuration, rated for 100mA at 20VDC. This through-hole mounted component features a slide actuator with gold-plated beryllium copper contacts and is designed for applications requiring reliable switching in compact form factors. The part is currently active in production with 1022 units in stock.

Equivalent and substitute parts are identified when design requirements allow for higher electrical ratings, alternative actuator types, or when primary part availability is constrained. Substitutes must maintain functional compatibility through matching circuit topology, position count, mounting style, and pitch specifications.

Substiute Parts

209-7MST

CTS ElectrocomponentsIn Stock: 1117209-7MST Datasheet

Current PartRFQ

76SB07ST

Grayhill Inc.In Stock: 111376SB07ST Datasheet

SimilarRFQ

78B07ST

Grayhill Inc.In Stock: 161878B07ST Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 209-7MST are qualified based on the following criteria:

Core Compatibility Requirements (Non-Negotiable):

• Circuit configuration: SPST
• Number of positions: 7
• Mounting type: Through hole
• Pitch: 0.100" (2.54mm)
• Termination style: PC pin
• Operating temperature range: -40°C ~ 85°C minimum
• RoHS3 compliance

Allowable Parameter Variations:

• Current rating: Equal to or greater than 100mA
• Voltage rating: Equal to or greater than 20VDC
• Actuator type: Slide or rocker configurations acceptable
• Contact material: Copper alloy or beryllium copper
• Height above board: Variation acceptable if PCB clearance permits

Identified Substitutes:

1. Grayhill Inc. 76SB07ST – Rocker actuator variant with enhanced electrical ratings (150mA, 30VDC)
2. Grayhill Inc. 78B07ST – Slide actuator variant with enhanced electrical ratings (150mA, 30VDC)

Both substitutes meet all core compatibility requirements and provide higher current and voltage capacity than the primary part.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (209-7MST): Select the CTS Electrocomponents 209-7MST when application requirements specify 100mA maximum current and 20VDC maximum voltage. This part offers the lowest profile at 0.190" height above board and uses beryllium copper contacts. All units are ROHS3 compliant and REACH unaffected.

Substitute Selection Criteria:

Grayhill Inc. 78B07ST is the preferred substitute when:

• Application requires higher current capacity (up to 150mA) or higher voltage (up to 30VDC)
• Slide actuator operation is required
• PCB layout accommodates increased height (0.315" vs. 0.190")
• Copper alloy contacts are acceptable

Grayhill Inc. 76SB07ST is the preferred substitute when:

• Application requires higher current capacity (up to 150mA) or higher voltage (up to 30VDC)
• Rocker actuator operation is preferred over slide
• PCB layout accommodates increased height (0.315" vs. 0.190")
• Copper alloy contacts are acceptable

Both substitutes maintain ROHS3 compliance, REACH unaffected status, and identical electrical life ratings (2,000 cycles). All three parts share identical pitch, termination style, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the Grayhill 78B07ST directly replace the CTS 209-7MST on an existing PCB?

A: Direct replacement is possible if PCB clearance permits the increased height (0.315" vs. 0.190"). The pitch, termination style, and mounting type are identical. Verify that the higher profile does not interfere with adjacent components or enclosure constraints.

Q: What is the difference between the Grayhill 76SB07ST and 78B07ST?

A: Both parts are functionally equivalent with identical electrical ratings (150mA, 30VDC). The primary difference is actuator type: 76SB07ST uses a rocker actuator, while 78B07ST uses a slide actuator. Select based on user interface preference and available PCB space.

Q: Are the contact materials interchangeable between the CTS and Grayhill parts?

A: Yes. The CTS 209-7MST uses beryllium copper contacts while the Grayhill substitutes use copper alloy contacts. Both materials are gold-plated and provide equivalent electrical performance for the specified current and voltage ratings. Contact material selection does not affect functional compatibility.

Q: What happens if I use a substitute part rated for higher voltage/current in a lower-voltage application?

A: Using a higher-rated part in a lower-voltage application is acceptable. The substitute will operate within its design margins. No performance degradation occurs when operating below maximum ratings.

Q: Are all three parts washable?

A: Yes. The CTS 209-7MST, Grayhill 76SB07ST, and Grayhill 78B07ST are all washable. The CTS part features epoxy sealed terminals and tape seal, while the Grayhill parts feature tape seal.

Q: Do these parts require different PCB footprints?

A: No. All three parts share identical pitch (0.100" / 2.54mm), termination style (PC pin), and mounting type (through hole). The footprint is identical. The only layout consideration is the increased height of the Grayhill substitutes.