ST21F2YZN Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The ST21F2YZN is a panel-mount toggle switch manufactured by APEM Inc., configured as a double-pole double-throw (DPDT) switch with On-On functionality. This component is rated for 0.4VA at 20V AC/DC and features a flatted brass actuator with nickel plating. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

ST21F2YZN

APEM Inc.In Stock: 960ST21F2YZN Datasheet

Current PartRFQ

7201L1YZBE

C&KIn Stock: 9057201L1YZBE Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST21F2YZN is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: DPDT (double-pole double-throw)
• Switch Function: On-On operation
• Electrical Ratings: 0.4VA at 20V AC/DC
• Mounting Interface: Panel mount with 6.35mm circular cutout and 1/4-40 bushing thread
• Termination: Solder lug connections
• Operating Temperature: -30°C ~ 85°C range
• Electrical Life: 100,000 cycles minimum
• Regulatory Compliance: ROHS3 compliance

The substitute part 7201L1YZBE from C&K meets all these critical parameters, enabling direct functional replacement in applications requiring DPDT toggle switch functionality at the specified electrical and mechanical interfaces.

Parameter Comparison

Engineering Selection Recommendations

The 7201L1YZBE from C&K represents a functionally equivalent substitute for the obsolete ST21F2YZN. Both components satisfy identical electrical specifications, mechanical interfaces, and regulatory requirements. The primary distinction is product status: the ST21F2YZN is obsolete while the 7201L1YZBE maintains active production status, ensuring long-term availability and supply chain continuity.

Both parts maintain ROHS3 compliance and operate across the identical temperature range with equivalent electrical life ratings. The mechanical interface—panel cutout diameter, bushing thread specification, and solder lug termination—is identical, enabling direct installation without panel modification or circuit redesign.

Selection between these components should prioritize the 7201L1YZBE for new designs and ongoing production due to its active status and guaranteed availability. For legacy system maintenance where original part specifications must be preserved, the 7201L1YZBE provides complete functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the 7201L1YZBE directly replace the ST21F2YZN in existing applications?

A: Yes. Both components share identical electrical ratings (0.4VA at 20V AC/DC), circuit configuration (DPDT On-On), and mechanical interfaces (6.35mm panel cutout, 1/4-40 bushing thread, solder lug termination). No circuit modification or panel rework is required.

Q: What is the primary reason for seeking a substitute for the ST21F2YZN?

A: The ST21F2YZN is classified as obsolete. The 7201L1YZBE is an active production part, ensuring availability for replacement stock, repair operations, and new system implementations.

Q: Are there differences in actuator design between these parts?

A: The ST21F2YZN features a flatted brass actuator with nickel plating (16.51mm length), while the 7201L1YZBE uses a standard round brass actuator with chrome plating (16.26mm length). Both actuator designs function identically within the DPDT On-On switching mechanism and are compatible with standard toggle switch panel cutouts.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the ST21F2YZN and 7201L1YZBE are ROHS3 compliant. The 7201L1YZBE is REACH Affected, while the ST21F2YZN is REACH Unaffected; however, both meet applicable regulatory requirements for their respective markets.

Q: What is the electrical life expectancy for these switches?

A: Both components are rated for 100,000 electrical cycles, providing equivalent operational longevity under specified load conditions.

Q: Are there inventory considerations when selecting between these parts?

A: The ST21F2YZN has 919 pieces in stock as new original inventory. The 7201L1YZBE has 812 pieces in stock. For long-term applications, the 7201L1YZBE is recommended due to its active production status, ensuring continued availability beyond current inventory levels.