Equivalent & Substitute Parts for C&K 8121SD9A3LE Pushbutton Switch

Part Overview

The C&K 8121SD9A3LE is a pushbutton switch with Single Pole Double Throw (SPDT) configuration, rated for 1A at 120V AC and 28V DC. This component features a standard through-hole, right-angle mounting design with a round plunger actuator and white cap. The part is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure ongoing component availability for production and service applications.

Substiute Parts

8121SD9A3LE

C&KIn Stock: 10268121SD9A3LE Datasheet

Current PartRFQ

8121SD9A3RE

C&KIn Stock: 11338121SD9A3RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete C&K 8121SD9A3LE is based on electrical and mechanical parameter equivalence within the C&K 8020 series. The substitute part must maintain identical specifications across the following critical parameters:

Circuit configuration (SPDT), switch function (On-Mom), current rating (1A AC/DC), voltage ratings (120V AC / 28V DC), mounting type (through hole, right angle), actuator type (round plunger), actuator color (white), termination style (PC pin), and operating temperature range (-30°C ~ 75°C). The electrical life rating of 60,000 cycles and moisture sensitivity level (MSL 1) establish the baseline performance envelope for functional equivalence.

The C&K 8121SD9A3RE satisfies all substitution criteria as an active product within the same series, offering identical electrical and mechanical characteristics with enhanced compliance status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The C&K 8121SD9A3RE is the direct equivalent substitute for the obsolete 8121SD9A3LE. Both components share identical electrical ratings, mechanical specifications, and functional characteristics. The substitute part offers the following advantages:

The 8121SD9A3RE maintains active product status, ensuring continued availability and supply chain reliability. The component carries ROHS3 compliance certification, representing an enhanced regulatory standard compared to the base RoHS compliance of the original part. Both components are classified under identical ECCN (EAR99) and HTSUS (8536.50.9031) codes, confirming equivalent trade and export classification. The substitute part includes tactile feedback as an additional feature, providing enhanced user interface feedback without altering electrical or mechanical performance parameters.

Selection of the C&K 8121SD9A3RE eliminates obsolescence risk while maintaining full functional and mechanical compatibility with existing circuit designs and PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the C&K 8121SD9A3RE be used as a direct replacement for the 8121SD9A3LE in existing designs?

A: Yes. Both components share identical electrical ratings (1A at 120V AC / 28V DC), circuit configuration (SPDT), mounting type (through hole, right angle), actuator specifications (round plunger, white), and operating temperature range (-30°C ~ 75°C). No circuit modifications or PCB layout changes are required.

Q: What is the primary difference between these two part numbers?

A: The 8121SD9A3LE is classified as obsolete, while the 8121SD9A3RE is an active product. The substitute part carries enhanced ROHS3 compliance certification and includes tactile feedback as a feature. All electrical and mechanical parameters remain identical.

Q: Are there packaging differences between the main part and substitute?

A: The 8121SD9A3LE is supplied in standard packaging, while the 8121SD9A3RE is supplied in tray packaging. Both packaging formats are suitable for through-hole component assembly processes.

Q: Do both parts have the same moisture sensitivity level?

A: Yes. Both the 8121SD9A3LE and 8121SD9A3RE are rated at MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: What is the electrical life rating for these components?

A: Both components are rated for 60,000 electrical cycles, establishing the expected operational lifespan under specified electrical load conditions.

Q: Are export and trade classifications identical for both parts?

A: Yes. Both components carry identical ECCN (EAR99) and HTSUS (8536.50.9031) classifications, confirming equivalent regulatory and trade status.