SB221NC/C Equivalent & Substitute Parts

Part Overview

The SB221NC/C is a pushbutton switch manufactured by NKK Switches, classified as a SPST-NC (Single Pole Single Throw - Normally Closed) standard panel mount component rated for 3A at 125V AC. This part is currently in Last Time Buy status, indicating discontinued production with limited remaining inventory. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

SB221NC/C

NKK SwitchesIn Stock: 1047SB221NC/C Datasheet

Current PartRFQ

SB221NC/CUL

NKK SwitchesIn Stock: 965SB221NC/CUL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SB221NC/C is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NC to maintain identical electrical behavior
• Current Rating: Must support minimum 3A AC
• Voltage Rating: Must support minimum 125V AC
• Mounting Type: Must be Panel Mount, Rear to ensure mechanical compatibility
• Termination Style: Must be Solder Lug for PCB integration compatibility
• Panel Cutout Dimensions: Must be Circular 12.50mm Dia for mechanical fit
• Operating Temperature Range: Must encompass -10°C ~ 70°C minimum
• Mechanical and Electrical Life: Must meet or exceed 50,000 cycles (mechanical) and 10,000 cycles (electrical)

The SB221NC/CUL variant meets all substitution criteria and is classified as an MFR Recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

The SB221NC/CUL is the designated MFR Recommended substitute for the SB221NC/C. Both components are manufactured by NKK Switches within the SB series and maintain identical electrical and mechanical specifications across all critical parameters.

The primary distinction is product status: the SB221NC/C is in Last Time Buy status with 968 units in stock, while the SB221NC/CUL is Active with 894 units available. For new designs or long-term production requirements, the SB221NC/CUL is the appropriate selection to ensure sustained supply chain availability.

Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Frequently Asked Questions (FAQ)

Q: Can the SB221NC/CUL be used as a direct replacement for the SB221NC/C?

A: Yes. Both components share identical electrical ratings (3A, 125V AC, SPST-NC), mechanical specifications (50,000 cycle life, 12.50mm panel cutout), and termination style (Solder Lug). No circuit modifications or mechanical adjustments are required.

Q: What is the difference between SB221NC/C and SB221NC/CUL?

A: The primary difference is product status. The SB221NC/C is Last Time Buy (discontinued), while SB221NC/CUL is Active (current production). The "/CUL" suffix indicates UL certification compliance. Electrical and mechanical performance are equivalent.

Q: Why is the SB221NC/C being discontinued?

A: The SB221NC/C is in Last Time Buy status, indicating NKK Switches has transitioned production to the SB221NC/CUL variant. This is a standard product lifecycle management practice.

Q: Are there any compatibility concerns when switching from SB221NC/C to SB221NC/CUL?

A: No compatibility concerns exist. Both components have identical panel cutout dimensions (12.50mm circular), termination style (Solder Lug), and electrical specifications. PCB layouts and mechanical mounting require no modification.

Q: What certifications apply to these components?

A: Both parts are ROHS3 compliant and REACH unaffected. The SB221NC/CUL carries UL certification (indicated by the "/CUL" designation).