KSR221J Equivalent & Substitute Parts

Part Overview

The KSR221J 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 with a 2.50mm actuator height and is designed for applications requiring momentary switching functionality. The KSR221J is currently listed as obsolete, making identification of equivalent substitute parts essential for ongoing production and maintenance applications.

Substiute Parts

KSR221J

C&KIn Stock: 796KSR221J Datasheet

Current PartRFQ

KSR221GLFS

C&KIn Stock: 9080KSR221GLFS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSR221J is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must remain SPST-NO
• Contact Rating: Must maintain 0.05A @ 32VDC
• Mounting Type: Must be Surface Mount
• Actuator Height: Must be 2.50mm vertical
• Actuator Orientation: Must be Top Actuated
• Outline Dimensions: Must be 6.00mm x 3.80mm
• Operating Force: Must be 200gf
• Switch Travel: Must be 0.30mm
• Operating Temperature Range: Must support -40°C ~ 85°C
• Ingress Protection: Must be IP50 - Dust Protected

The primary distinction between the main part and its substitute relates to termination style (J Lead versus Gull Wing), packaging format, product status, and compliance certifications. These differences do not affect electrical or mechanical functionality within the specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The KSR221GLFS serves as a direct functional equivalent to the KSR221J across all critical electrical and mechanical parameters. Selection between these parts should be based on the following factors:

Product Status: The KSR221J is obsolete, while the KSR221GLFS maintains active product status with significantly higher inventory availability (9065 units versus 693 units). For new designs or long-term production requirements, the KSR221GLFS is the appropriate selection.

Compliance and Certifications: The KSR221GLFS is ROHS3 compliant, whereas the KSR221J is RoHS non-compliant. Applications subject to RoHS regulations require the KSR221GLFS. Both parts are REACH Unaffected and classified as EAR99.

Termination and Packaging: The KSR221J uses J Lead termination, while the KSR221GLFS employs Gull Wing termination. PCB layout and assembly process compatibility must be verified for the specific application. The KSR221GLFS is supplied in Cut Tape packaging format.

Mechanical Life: The KSR221J specifies 200,000 mechanical cycles, while the KSR221GLFS specifies 100,000 cycles. Applications requiring extended cycle life should account for this difference in component selection.

Frequently Asked Questions (FAQ)

Q: Can the KSR221GLFS directly replace the KSR221J in existing designs?

A: The KSR221GLFS matches all critical electrical and mechanical parameters of the KSR221J, including circuit configuration, contact rating, actuator height, operating force, and temperature range. However, the termination style differs (Gull Wing versus J Lead), requiring PCB layout verification and potential assembly process adjustments.

Q: What is the significance of the termination style difference?

A: Termination style affects solder joint geometry and PCB pad design. J Lead termination creates solder joints on the side of the component, while Gull Wing termination creates solder joints on the underside. PCB footprints must be designed or verified to accommodate the specific termination style.

Q: Why is the KSR221J listed as obsolete?

A: The KSR221J is no longer in active production. The KSR221GLFS represents the current active equivalent within the KSR series, offering improved compliance status and higher availability.

Q: Are there compliance differences between these parts?

A: Yes. The KSR221GLFS is ROHS3 compliant, while the KSR221J is RoHS non-compliant. Applications subject to RoHS directives must use the KSR221GLFS. Both parts are REACH Unaffected.

Q: What is the difference in mechanical life specifications?

A: The KSR221J specifies 200,000 mechanical cycles, while the KSR221GLFS specifies 100,000 cycles. Applications with high cycle count requirements should evaluate this parameter against actual usage patterns.

Q: How does packaging format affect component selection?

A: The KSR221GLFS is supplied in Cut Tape (CT) packaging, which is standard for automated assembly processes. Packaging format affects inventory management, component handling, and assembly line compatibility but does not impact electrical or mechanical performance.

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

A: Yes. Both the KSR221J and KSR221GLFS operate across the identical temperature range of -40°C to 85°C, ensuring thermal compatibility in equivalent applications.