KSC521G Equivalent & Substitute Parts

Part Overview

The KSC521G 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 a sealed design with IP50 dust protection and is rated for 10,000 mechanical cycles. The KSC521G is currently listed as obsolete, making identification of compatible substitute parts essential for ongoing production and maintenance applications. The primary substitute addresses RoHS compliance requirements while maintaining identical electrical and mechanical specifications.

Substiute Parts

KSC521G

C&KIn Stock: 1007KSC521G Datasheet

Current PartRFQ

KSC521G ROHS

C&KIn Stock: 10623KSC521G ROHS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The KSC521G ROHS serves as a direct substitute based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Circuit configuration remains SPST-NO
• Contact rating matches 0.05A @ 32VDC
• Surface mount footprint and outline dimensions are 6.20mm x 6.20mm
• Actuator height is 5.60mm with gull wing termination
• Operating force is 200gf
• Mechanical life specification is 10,000 cycles
• Operating temperature range is -40°C ~ 85°C
• Ingress protection level is IP50

The primary distinction between the main part and its substitute is product status and RoHS compliance. The KSC521G ROHS variant is actively manufactured and complies with RoHS3 requirements, whereas the original KSC521G is obsolete and non-compliant.

Parameter Comparison

Engineering Selection Recommendations

The KSC521G ROHS is the appropriate selection for new designs and production applications. This variant maintains full electrical and mechanical compatibility with the original KSC521G while offering two critical advantages: active product status with guaranteed supply availability and ROHS3 compliance, which is required for applications subject to environmental regulations in the EU and other jurisdictions.

For legacy systems currently using the obsolete KSC521G, direct substitution with KSC521G ROHS is permissible without circuit modification or PCB redesign, as all functional parameters and physical dimensions are identical. The gull wing termination and surface mount footprint ensure compatibility with existing assembly processes.

Frequently Asked Questions (FAQ)

Q: Can KSC521G ROHS be used as a direct replacement for KSC521G in existing designs?

A: Yes. The KSC521G ROHS is electrically and mechanically identical to the KSC521G. All critical parameters—contact rating, actuator height, outline dimensions, operating force, and mechanical life—are unchanged. The component can be substituted without PCB modification.

Q: What is the primary reason to transition from KSC521G to KSC521G ROHS?

A: The original KSC521G is obsolete and no longer manufactured. The KSC521G ROHS is the active production equivalent and is ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Are there packaging differences between these parts?

A: The KSC521G ROHS is supplied in Tape & Reel (TR) packaging, which is standard for high-volume surface mount assembly. The original KSC521G packaging specification was not provided. Tape & Reel packaging is compatible with automated pick-and-place equipment.

Q: Do these switches have identical mechanical specifications?

A: Yes. Both variants have a 5.60mm actuator height, 6.20mm x 6.20mm outline, 200gf operating force, 0.25mm and 0.50mm switch travel options, and 10,000-cycle mechanical life rating.

Q: What is the operating temperature range for both parts?

A: Both the KSC521G and KSC521G ROHS operate across -40°C to 85°C, making them suitable for industrial and consumer applications within this thermal envelope.

Q: Are both parts sealed against environmental contamination?

A: Yes. Both variants feature sealed construction with IP50 ingress protection, providing dust protection suitable for general industrial environments.