C&K 7103MD9A2LE Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The C&K 7103MD9A2LE is a toggle switch with SPDT (Single Pole Double Throw) configuration rated for 5A at 120V AC and 28V DC. This through-hole, right-angle mounted switch features an On-Off-On function with epoxy sealed terminals and a 40,000-cycle electrical life. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

7103MD9A2LE

C&KIn Stock: 12097103MD9A2LE Datasheet

Current PartRFQ

7103MD9A2RE

C&KIn Stock: 11727103MD9A2RE Datasheet

DirectRFQ

100SP3T2B4M6QE

E-SwitchIn Stock: 917100SP3T2B4M6QE Datasheet

SimilarRFQ

100SP3T2B4M6RE

E-SwitchIn Stock: 8887100SP3T2B4M6RE Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters:

• Circuit configuration (SPDT)
• Switch function (On-Off-On)
• Current rating (5A AC/DC minimum)
• Voltage rating (120V AC / 28V DC minimum)
• Mounting type (Through Hole, Right Angle)
• Termination style (PC Pin)
• Operating temperature range (-30°C to 85°C)
• Electrical life (40,000 cycles)

Direct Equivalent: 7103MD9A2RE (C&K) matches all critical parameters and differs only in product status (Active vs. Obsolete) and packaging format.

Similar Substitutes: 100SP3T2B4M6QE (E-Switch) matches all critical parameters with identical electrical and mechanical specifications. The 100SP3T2B4M6RE (E-Switch) shares the same mounting and termination characteristics but operates at reduced voltage (20V AC/DC) and current (0.4VA), making it unsuitable for the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

7103MD9A2RE (C&K): This is the primary direct equivalent. It maintains identical electrical ratings (5A, 120V AC, 28V DC), mechanical configuration, and actuator dimensions. The part is currently in active production status with ROHS3 compliance and REACH affected designation. This substitution requires no circuit redesign.

100SP3T2B4M6QE (E-Switch): This part provides full electrical and functional equivalence with identical current and voltage ratings. It is active in production with ROHS3 compliance and REACH unaffected status. The actuator length differs (5.08mm vs. 6.86mm), which may affect panel cutout alignment and operator feel. Physical verification of mounting clearance is necessary before implementation.

100SP3T2B4M6RE (E-Switch): This part does not meet the electrical requirements of the original application. The reduced voltage rating (20V AC/DC) and current capacity (0.4VA) make it unsuitable as a substitute for the 7103MD9A2LE in circuits requiring 120V AC or 5A operation.

Frequently Asked Questions (FAQ)

Q: Can 7103MD9A2RE be used as a direct replacement for 7103MD9A2LE?

A: Yes. Both parts share identical electrical ratings (5A, 120V AC, 28V DC), circuit configuration (SPDT), switch function (On-Off-On), mounting type (Through Hole, Right Angle), and actuator dimensions (6.86mm). The primary difference is product status: 7103MD9A2LE is obsolete while 7103MD9A2RE is active. No circuit modifications are required.

Q: What is the key difference between 100SP3T2B4M6QE and 100SP3T2B4M6RE?

A: Both are E-Switch products with identical mounting and termination characteristics. However, 100SP3T2B4M6QE maintains the full 5A/120V AC electrical specification matching the original part, while 100SP3T2B4M6RE is rated for only 0.4VA at 20V AC/DC. The 100SP3T2B4M6RE cannot substitute for applications requiring higher voltage or current.

Q: Does the actuator length difference between 7103MD9A2LE and 100SP3T2B4M6QE affect compatibility?

A: The actuator length differs by 1.78mm (6.86mm vs. 5.08mm). This may impact panel cutout alignment and operator feel. Physical verification of the mounting panel and actuator clearance is necessary before implementation in existing designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts—7103MD9A2LE, 7103MD9A2RE, 100SP3T2B4M6QE, and 100SP3T2B4M6RE—are ROHS3 compliant.

Q: Which substitute part has the best availability?

A: 100SP3T2B4M6RE has the highest inventory (8,787 pcs), followed by 7103MD9A2RE (1,114 pcs) and 100SP3T2B4M6QE (852 pcs). However, 100SP3T2B4M6RE does not meet the electrical requirements of the original application.

Q: What is the difference in REACH status between the substitute parts?

A: 7103MD9A2LE and 100SP3T2B4M6QE are REACH Unaffected. 7103MD9A2RE is REACH Affected. 100SP3T2B4M6RE is REACH Unaffected. Regulatory requirements for your application region should determine which designation is acceptable.