MML21KA2ADK Equivalent & Substitute Parts

Part Overview

The MML21KA2ADK is a pushbutton switch manufactured by Honeywell Sensing and Productivity Solutions, classified as a DPDT (Double Pole Double Throw) standard panel mount switch rated for 1A at 125V AC. This component features a rectangular black button actuator with tactile feedback and solder lug termination, designed for front panel mounting applications.

The MML21KA2ADK is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this switch configuration.

Substiute Parts

MML21KA2ADK

Honeywell Sensing and Productivity SolutionsIn Stock: 978MML21KA2ADK Datasheet

Current PartRFQ

MML21KA3ADK

Honeywell Sensing and Productivity SolutionsIn Stock: 969MML21KA3ADK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MML21KA2ADK are identified based on strict electrical and mechanical parameter matching within the MML21 series. The following parameters define substitution eligibility:

Critical Matching Parameters:

• Circuit Configuration: DPDT
• Switch Function: On-On
• Current Rating: 1A (AC)
• Voltage Rating: 125V AC
• Mounting Type: Panel Mount, Front
• Actuator Type: Rectangular, Button
• Panel Cutout Dimensions: 15.20mm x 10.24mm
• Operating Temperature Range: -18°C to 65°C
• Mechanical Life: 100,000 Cycles
• Electrical Life: 25,000 Cycles
• RoHS Compliance: Required

Variable Parameters (Allowed to Differ):

• Termination Style (Solder Lug vs. PC Pin)
• Product Status (Obsolete vs. Active)

The MML21KA3ADK qualifies as a substitute because it maintains all critical electrical and mechanical parameters while differing only in termination style and product status.

Parameter Comparison

Engineering Selection Recommendations

The MML21KA3ADK serves as a direct functional substitute for the obsolete MML21KA2ADK. Both components are manufactured by Honeywell Sensing and Productivity Solutions and maintain identical electrical ratings, mechanical specifications, and panel mounting dimensions.

The primary distinction between these parts is the termination style: the MML21KA2ADK uses solder lug termination, while the MML21KA3ADK uses PC pin termination. This difference requires corresponding modifications to the circuit board or wiring harness design to accommodate the alternative connection method.

The MML21KA3ADK holds active product status, ensuring ongoing availability and manufacturer support. Both parts maintain RoHS compliance and identical performance characteristics across all critical operating parameters, including current rating, voltage rating, temperature range, and mechanical/electrical life cycles.

Frequently Asked Questions (FAQ)

Q: Can the MML21KA3ADK directly replace the MML21KA2ADK without any modifications?

A: The MML21KA3ADK is electrically and mechanically equivalent to the MML21KA2ADK. However, the termination style differs: MML21KA2ADK uses solder lug termination while MML21KA3ADK uses PC pin termination. Circuit board or connector modifications are required to accommodate this difference.

Q: Are the panel cutout dimensions identical between these two parts?

A: Yes. Both the MML21KA2ADK and MML21KA3ADK require a rectangular panel cutout of 15.20mm x 10.24mm. No mechanical redesign of the panel mounting interface is necessary.

Q: What is the significance of the product status difference?

A: The MML21KA2ADK is obsolete, meaning Honeywell no longer manufactures or supports this part. The MML21KA3ADK is active, ensuring continued availability, technical support, and compliance with current manufacturing standards.

Q: Do both parts meet the same electrical specifications?

A: Yes. Both parts are rated for 1A at 125V AC, feature DPDT On-On switching function, and maintain identical mechanical life (100,000 cycles) and electrical life (25,000 cycles) specifications.

Q: Are there any differences in operating temperature range?

A: No. Both parts operate across the identical temperature range of -18°C to 65°C.

Q: Is RoHS compliance maintained in the substitute part?

A: Yes. The MML21KA3ADK is RoHS compliant, matching the compliance status of the MML21KA2ADK.