KSR251G Equivalent & Substitute Parts

Part Overview

The KSR251G 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 is designed for applications requiring momentary switching functionality. The KSR251G is currently listed as obsolete, making identification of equivalent substitute parts essential for ongoing production and maintenance applications.

Substiute Parts

KSR251G

C&KIn Stock: 2756KSR251G Datasheet

Current PartRFQ

KSR251GLFS

C&KIn Stock: 39854KSR251GLFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSR251G is determined by strict equivalence across the following critical parameters:

Electrical Compatibility: Circuit configuration (SPST-NO), switch function (Off-Mom), and contact rating (0.05A @ 32VDC) must remain identical.

Mechanical Compatibility: Mounting type (Surface Mount), actuator height (2.50mm vertical), actuator orientation (Top Actuated), termination style (Gull Wing), and outline dimensions (6.00mm x 3.80mm) must match exactly to ensure PCB layout compatibility.

Environmental & Operational Specifications: Operating temperature range (-40°C ~ 85°C), operating force (450gf), switch travel (0.50mm), mechanical life (100,000 cycles), and ingress protection (IP50) must be maintained.

Series Consistency: The substitute part must belong to the KSR series to ensure design continuity.

The KSR251GLFS meets all these criteria and is identified as a direct substitute for the obsolete KSR251G.

Parameter Comparison

Engineering Selection Recommendations

The KSR251GLFS is the direct substitute for the obsolete KSR251G. Both parts are electrically and mechanically identical across all functional parameters. The primary distinction is product status and regulatory compliance.

For New Designs and Production: The KSR251GLFS is the appropriate selection. It maintains active product status with C&K and carries ROHS3 compliance certification, meeting current regulatory requirements. The part is available in standard packaging formats (Cut Tape and Digi-Reel®), supporting both prototype and high-volume production workflows.

For Legacy System Maintenance: The KSR251GLFS provides full functional equivalence to the KSR251G without requiring circuit redesign or PCB layout modification. The identical mechanical and electrical specifications ensure drop-in compatibility.

Compliance Consideration: Designs transitioning from KSR251G to KSR251GLFS benefit from improved RoHS compliance status (ROHS3 vs. non-compliant), supporting long-term supply chain sustainability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can KSR251GLFS be used as a direct replacement for KSR251G in existing designs?

A: Yes. The KSR251GLFS is electrically and mechanically identical to the KSR251G. All critical parameters—circuit configuration, contact rating, mounting type, actuator dimensions, operating force, temperature range, and mechanical life—are equivalent. No circuit redesign or PCB layout modification is required.

Q: What is the primary difference between KSR251G and KSR251GLFS?

A: The KSR251G is obsolete, while the KSR251GLFS maintains active product status. Additionally, the KSR251GLFS is ROHS3 compliant, whereas the KSR251G is RoHS non-compliant. Functionally and mechanically, both parts are identical.

Q: Are there packaging differences between these parts?

A: The KSR251G packaging specification is not defined in available documentation. The KSR251GLFS is available in Cut Tape (CT) and Digi-Reel® packaging formats, supporting both prototype and production-scale applications.

Q: What parameters determine substitution eligibility for KSR251G?

A: Substitution is determined by equivalence in circuit configuration (SPST-NO), contact rating (0.05A @ 32VDC), mounting type (Surface Mount), actuator dimensions (2.50mm height, top actuated), termination style (Gull Wing), outline dimensions (6.00mm x 3.80mm), operating force (450gf), temperature range (-40°C ~ 85°C), switch travel (0.50mm), mechanical life (100,000 cycles), and ingress protection (IP50).

Q: Is the KSR251GLFS suitable for applications requiring RoHS compliance?

A: Yes. The KSR251GLFS carries ROHS3 compliance certification, making it suitable for applications and supply chains requiring RoHS compliance. The KSR251G is RoHS non-compliant.

Q: Can KSR251GLFS handle the same electrical load as KSR251G?

A: Yes. Both parts have identical contact ratings of 0.05A @ 32VDC and are designed for the same electrical load specifications.