KSC321G Equivalent & Substitute Parts

Part Overview

The KSC321G is a tactile switch manufactured by C&K, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.05A at 32VDC. This surface mount component features top actuation, gull wing termination, and IP67 ingress protection. The KSC321G is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

KSC321G

C&KIn Stock: 2344KSC321G Datasheet

Current PartRFQ

KSC321GLFS

C&KIn Stock: 45490KSC321GLFS Datasheet

DirectRFQ

FSM2JSSMTR

TE Connectivity ALCOSWITCH SwitchesIn Stock: 4983FSM2JSSMTR Datasheet

SimilarRFQ

TL3304AF160QG

E-SwitchIn Stock: 23988TL3304AF160QG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KSC321G is determined by the following critical parameters: circuit configuration (SPST-NO), contact rating voltage capability, mounting type (surface mount), actuator orientation (top actuated), termination style (gull wing), and physical footprint compatibility. The substitute parts identified maintain the same circuit topology and mounting characteristics. Variations in contact rating voltage, actuator height, operating force, switch travel, and mechanical life are documented to enable informed selection based on specific application requirements.

Key Parameters for Substitution Assessment:

• Circuit Configuration: SPST-NO
• Mounting Type: Surface Mount
• Actuator Orientation: Top Actuated
• Termination Style: Gull Wing
• Outline Dimensions: 6.20mm x 6.20mm (primary); 7.60mm x 7.30mm (secondary consideration)

Parameter Comparison

Engineering Selection Recommendations

KSC321GLFS (Direct Equivalent): This C&K part maintains identical electrical and mechanical specifications to the KSC321G, including contact rating (0.05A @ 32VDC), outline dimensions (6.20mm x 6.20mm), actuator height (4.60mm), operating force (200gf), and mechanical life (300,000 cycles). The primary distinction is product status: KSC321GLFS is active and ROHS3 compliant, whereas KSC321G is obsolete and RoHS non-compliant. Packaging differs (Tape & Reel versus Cut Tape). This part is the preferred direct replacement.

FSM2JSSMTR (TE Connectivity): This substitute maintains SPST-NO circuit configuration, surface mount topology, top actuation, and gull wing termination. The contact rating is reduced to 0.05A @ 24VDC. Physical footprint differs (7.60mm x 7.30mm versus 6.20mm x 6.20mm), and actuator height is increased to 4.30mm. Operating force is reduced to 160gf, and switch travel is increased to 0.35mm. Mechanical life is significantly higher at 1,000,000 cycles. This part is suitable only for applications where the larger footprint and reduced voltage rating are acceptable.

TL3304AF160QG (E-Switch): This substitute maintains SPST-NO circuit configuration, surface mount topology, top actuation, and gull wing termination with matching outline dimensions (6.20mm x 6.20mm). The contact rating is increased to 0.05A @ 50VDC, providing higher voltage capability. Actuator height is slightly reduced to 3.40mm, and operating force is reduced to 160gf. Switch travel is increased to 0.25mm. Mechanical life is significantly lower at 100,000 cycles. Operating temperature range is narrower (-20°C ~ 70°C). Ingress protection is not specified. This part is suitable for applications requiring higher voltage rating but with lower cycle life requirements.

Frequently Asked Questions (FAQ)

Q: Can KSC321GLFS be used as a direct replacement for KSC321G?

A: Yes. KSC321GLFS is electrically and mechanically identical to KSC321G across all critical parameters: contact rating (0.05A @ 32VDC), outline dimensions (6.20mm x 6.20mm), actuator height (4.60mm), operating force (200gf), and mechanical life (300,000 cycles). The primary differences are product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). Packaging format differs (Tape & Reel versus Cut Tape).

Q: What are the key differences between KSC321G and FSM2JSSMTR?

A: FSM2JSSMTR differs in several parameters: contact rating voltage is reduced to 24VDC (versus 32VDC), outline dimensions are larger at 7.60mm x 7.30mm (versus 6.20mm x 6.20mm), actuator height is increased to 4.30mm (versus 4.60mm), operating force is reduced to 160gf (versus 200gf), switch travel is increased to 0.35mm (versus 0.20mm), and mechanical life is significantly higher at 1,000,000 cycles (versus 300,000 cycles). These differences may impact PCB layout compatibility and application performance.

Q: Is TL3304AF160QG suitable for high-temperature applications?

A: TL3304AF160QG has an operating temperature range of -20°C ~ 70°C, which is narrower than KSC321G (-40°C ~ 85°C). Applications requiring operation below -20°C or above 70°C should not use this substitute.

Q: What is the impact of reduced mechanical life in TL3304AF160QG?

A: TL3304AF160QG has a mechanical life rating of 100,000 cycles, compared to 300,000 cycles for KSC321G. This represents a 67% reduction in rated cycle life. Applications with high actuation frequency or long service life requirements should account for this limitation.

Q: Does FSM2JSSMTR maintain IP67 ingress protection?

A: Yes. FSM2JSSMTR maintains IP67 ingress protection and is specified as sealed fully, providing equivalent environmental protection to KSC321G.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. KSC321GLFS, FSM2JSSMTR, and TL3304AF160QG are all ROHS3 compliant. The original KSC321G is RoHS non-compliant.

Q: What packaging formats are available for these parts?

A: KSC321G is supplied in Cut Tape (CT) format. KSC321GLFS, FSM2JSSMTR, and TL3304AF160QG are supplied in Tape & Reel (TR) format, which is standard for high-volume production applications.