KSC521J Equivalent & Substitute Parts

Part Overview

The KSC521J 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 or side actuation with a 5.60mm actuator height and sealed construction rated IP50 for dust protection. The KSC521J 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

KSC521J

C&KIn Stock: 1626KSC521J Datasheet

Current PartRFQ

KSC521J ROHS

C&KIn Stock: 11044KSC521J ROHS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The KSC521J ROHS serves as a direct substitute based on identical electrical and mechanical parameters. Substitution eligibility is determined by the following criteria:

• Circuit Configuration: Must be SPST-NO
• Contact Rating: Must be 0.05A @ 32VDC
• Mounting Type: Must be Surface Mount
• Actuator Height: Must be 5.60mm
• Outline Dimensions: Must be 6.20mm x 6.20mm
• Operating Force: Must be 200gf
• Switch Travel: Must support 0.25mm and 0.50mm options
• Mechanical Life: Must be 10,000 Cycles minimum
• Operating Temperature: Must cover -40°C ~ 85°C range
• Ingress Protection: Must be IP50 or equivalent
• Termination Style: Must be J Lead

The KSC521J ROHS variant maintains all specified parameters while providing RoHS3 compliance, addressing regulatory requirements for new designs and procurement.

Parameter Comparison

Engineering Selection Recommendations

The KSC521J ROHS is the appropriate selection for new designs and procurement activities. While the original KSC521J remains electrically and mechanically equivalent, its obsolete status and non-compliant RoHS classification present supply chain and regulatory constraints. The KSC521J ROHS maintains full functional parity across all specified parameters while providing ROHS3 compliance and active product status. For applications requiring the KSC521J, direct substitution with KSC521J ROHS is supported without design modification. Packaging availability in Tape & Reel format for the substitute part accommodates high-volume manufacturing requirements.

Frequently Asked Questions (FAQ)

Q: Can KSC521J ROHS be used as a direct replacement for KSC521J?

A: Yes. The KSC521J ROHS maintains identical electrical specifications (0.05A @ 32VDC), mechanical dimensions (6.20mm x 6.20mm outline, 5.60mm actuator height), operating force (200gf), switch travel (0.25mm, 0.50mm), and temperature range (-40°C ~ 85°C). No circuit design changes are required.

Q: What is the primary difference between KSC521J and KSC521J ROHS?

A: The KSC521J ROHS is ROHS3 compliant, whereas the original KSC521J is non-compliant. The substitute part is also listed as active product status compared to the obsolete status of the original. All functional and mechanical parameters remain identical.

Q: Are there packaging differences between these parts?

A: The KSC521J ROHS is supplied in Tape & Reel (TR) packaging, which is standard for surface mount component procurement. The original KSC521J packaging specification was not provided.

Q: Does the MSL rating differ between the parts?

A: No. Both parts carry MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture control requirements during storage or handling.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the KSC521J and KSC521J ROHS operate across -40°C ~ 85°C, supporting identical thermal application requirements.

Q: What certifications apply to both parts?

A: Both parts carry REACH Unaffected status and EAR99 ECCN classification. The HTSUS code is identical (8536.50.9031) for tariff purposes.