Equivalent & Substitute Parts for Honeywell 21SM284-T2 Snap Action Switch

Part Overview

The Honeywell 21SM284-T2 is a snap action switch with Single Pole Double Throw (SPDT) configuration, rated for 5A at 115V AC and 28V DC. This chassis-mounted switch features a round pin plunger actuator and solder turret termination, designed for on-momentary switching applications. The part is currently in active production status with 803 units in stock. Substitute parts may be required due to supply chain constraints, manufacturing discontinuation of alternative models, or specific application requirements necessitating equivalent electrical and mechanical characteristics.

Substiute Parts

21SM284-T2

Honeywell Sensing and Productivity SolutionsIn Stock: 90921SM284-T2 Datasheet

Current PartRFQ

DB1C-A1AA

Hirose Electric Co LtdIn Stock: 919DB1C-A1AA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the Honeywell 21SM284-T2 is based on the following critical parameters:

Electrical Compatibility Parameters:

• Circuit type must be SPDT
• Current rating must support 5A minimum
• Voltage ratings must accommodate 115V AC and 28V DC operation
• Operating temperature range must encompass -55°C to 125°C

Mechanical Compatibility Parameters:

• Actuator type must be round pin plunger configuration
• Mounting type must be chassis mount
• Termination style must be solder turret

Regulatory and Quality Parameters:

• RoHS compliance status must be maintained
• Moisture Sensitivity Level (MSL) classification must be 1 or equivalent
• ECCN and HTSUS classifications should align for supply chain consistency

The substitute part DB1C-A1AA from Hirose Electric Co Ltd shares the same MSL rating, ECCN code, and HTSUS classification as the primary part. However, detailed electrical and mechanical specifications for the DB1C-A1AA are not provided in the available data, limiting direct parameter-to-parameter comparison.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The Honeywell 21SM284-T2 remains the preferred selection due to its active product status, full technical specification availability, and confirmed RoHS compliance. With 803 units in current inventory, supply availability is established.

Substitute Part Consideration: The Hirose DB1C-A1AA is listed as an equivalent substitute; however, its obsolete product status presents a significant constraint. The part shares identical MSL, ECCN, and HTSUS classifications with the primary part, indicating regulatory and supply chain alignment. The absence of detailed electrical and mechanical specifications for the DB1C-A1AA prevents full parameter verification against the substitution criteria outlined above.

Selection Criteria:

• For new designs or active production: Select Honeywell 21SM284-T2 (active status, full specifications available)
• For legacy system maintenance: DB1C-A1AA may be considered only if historical documentation confirms electrical and mechanical equivalence
• Regulatory compliance: Both parts maintain EAR99 classification and MSL 1 rating

Frequently Asked Questions (FAQ)

Q: What makes the Hirose DB1C-A1AA a valid substitute for the Honeywell 21SM284-T2?

A: The DB1C-A1AA is listed as an equivalent substitute based on shared regulatory classifications (ECCN EAR99, HTSUS 8536.50.7000) and identical Moisture Sensitivity Level (MSL 1). However, complete electrical and mechanical specification data for the DB1C-A1AA is not available in the provided documentation. Substitution should be confirmed through detailed specification comparison before implementation.

Q: Can I use the Hirose DB1C-A1AA in new production designs?

A: The DB1C-A1AA carries an obsolete product status, making it unsuitable for new production designs. The Honeywell 21SM284-T2, with active status and confirmed availability, is the appropriate choice for new applications.

Q: What are the critical parameters that determine if another switch can substitute for the 21SM284-T2?

A: Substitutes must match the following parameters: SPDT circuit configuration, 5A current rating (AC/DC), 115V AC and 28V DC voltage ratings, round pin plunger actuator, chassis mount configuration, solder turret termination, -55°C to 125°C operating temperature range, and RoHS compliance status.

Q: Does the 21SM284-T2 meet RoHS requirements?

A: Yes, the Honeywell 21SM284-T2 is RoHS compliant, meeting regulatory requirements for hazardous substance restrictions.

Q: What is the mechanical life expectancy of the 21SM284-T2?

A: The switch is rated for 80,000 mechanical cycles, indicating the expected operational lifespan under normal switching conditions.

Q: Are there any packaging or inventory considerations when selecting between the primary part and substitutes?

A: The Honeywell 21SM284-T2 is available in bulk packaging with 803 units currently in stock, ensuring supply availability. The Hirose DB1C-A1AA, being obsolete, presents limited availability and should not be relied upon for ongoing supply requirements.