U21MD9ASE Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The U21MD9ASE is an active production toggle switch manufactured by C&K, classified as a DPDT (Double Pole Double Throw) switch with On-On functionality. This through-hole, right-angle mounted component is rated for 5A at 120V AC and 28V DC, making it suitable for general-purpose switching applications requiring dual-circuit control. The part is in active product status with 1031 units currently in stock. Alternative equivalent parts may be required due to supply constraints, design revisions, or packaging preferences.

Substiute Parts

U21MD9ASE

C&KIn Stock: 1090U21MD9ASE Datasheet

Current PartRFQ

100DP1T2B4M6QE

E-SwitchIn Stock: 8284100DP1T2B4M6QE Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the U21MD9ASE is determined by strict equivalence across the following critical parameters:

• Circuit configuration must be DPDT
• Switch function must be On-On
• Current rating must be 5A (AC/DC)
• Voltage ratings must meet or exceed 120V AC and 28V DC
• Mounting type must be through-hole, right-angle
• Termination style must be PC Pin
• Operating temperature range must encompass -30°C to 85°C
• RoHS3 compliance is required

The substitute part 100DP1T2B4M6QE manufactured by E-Switch meets all critical electrical and mechanical parameters. Variations in actuator length (5.08mm versus 6.86mm), electrical life cycles (40,000 versus 100,000), and packaging format (bulk versus tray) do not preclude functional substitution but should be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the U21MD9ASE and 100DP1T2B4M6QE are active production components with ROHS3 compliance and equivalent electrical specifications. Selection between these parts should be based on the following factors:

The U21MD9ASE offers extended electrical life (100,000 cycles) and is supplied in tray packaging, suitable for applications requiring higher cycle durability or organized component handling. The 100DP1T2B4M6QE provides equivalent electrical performance with a shorter actuator length (5.08mm versus 6.86mm) and bulk packaging, which may be advantageous for space-constrained designs or high-volume procurement scenarios.

Both parts are suitable for direct substitution in applications operating within the specified voltage and current parameters. The choice between them should account for mechanical envelope constraints, expected operational cycle count, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the 100DP1T2B4M6QE replace the U21MD9ASE in all applications?

A: The 100DP1T2B4M6QE is electrically equivalent and mechanically compatible for through-hole, right-angle mounting. The primary consideration is actuator length: the E-Switch part is 1.78mm shorter. Verify that panel cutout geometry and actuator clearance accommodate this difference in your specific application.

Q: What is the significance of the difference in electrical life ratings?

A: The U21MD9ASE is rated for 100,000 cycles while the 100DP1T2B4M6QE is rated for 40,000 cycles. For applications with high switching frequency or extended operational life requirements, the U21MD9ASE may be the preferred choice. For standard-duty applications, both parts meet typical industrial requirements.

Q: Are there packaging implications for substitution?

A: The U21MD9ASE is supplied in tray packaging while the 100DP1T2B4M6QE is supplied in bulk packaging. This affects component organization and handling but does not impact electrical or mechanical performance. Verify that your assembly process accommodates the packaging format of the substitute part.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant. The U21MD9ASE carries REACH Affected status while the 100DP1T2B4M6QE is REACH Unaffected. Verify compliance requirements for your specific application and regulatory jurisdiction.

Q: What are the critical parameters that must match for substitution?

A: Circuit configuration (DPDT), switch function (On-On), current rating (5A AC/DC), voltage ratings (120V AC / 28V DC), mounting type (through-hole right-angle), termination style (PC Pin), and operating temperature range (-30°C to 85°C) must all be equivalent. Variations in actuator length, electrical life, and packaging do not prevent substitution but should be evaluated against application requirements.