DA09T DIP Switch SPST 9 Position Equivalent & Substitute Parts

Part Overview

The DA09T is a slide-actuated DIP switch manufactured by APEM Inc., configured as a single-pole single-throw (SPST) switch with 9 positions. This component is rated for 50mA at 24VDC and features through-hole, right-angle mounting with gold-plated phosphor bronze contacts. The DA09T is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

DA09T

APEM Inc.In Stock: 847DA09T Datasheet

Current PartRFQ

KAS2109E

E-SwitchIn Stock: 678KAS2109E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DA09T is determined by the following critical parameters:

• Circuit Configuration: Must be SPST to maintain single-pole single-throw functionality
• Number of Positions: Must be 9 positions to ensure pin-count compatibility
• Voltage Rating: Must support minimum 24VDC operation
• Current Rating: Must support minimum 50mA continuous current
• Mounting Type: Must be through-hole, right-angle to fit existing PCB layouts
• Pitch: Must maintain 0.100" (2.54mm) spacing for footprint compatibility
• Height Above Board: Must not exceed 0.390" (9.90mm) to avoid mechanical interference
• Termination Style: Must use PC Pin termination for direct board insertion

The KAS2109E from E-Switch meets all mandatory substitution criteria with the exception of current rating, which is specified at 25mA versus the DA09T's 50mA rating.

Parameter Comparison

Engineering Selection Recommendations

The KAS2109E from E-Switch provides functional substitution for the DA09T in applications where the reduced current rating of 25mA is acceptable. Both components are ROHS3 compliant and carry MSL 1 moisture sensitivity ratings, indicating equivalent environmental handling requirements.

The KAS2109E offers an extended operating temperature range (-40°C to 85°C) compared to the DA09T (-20°C to 70°C), providing broader thermal performance. However, the KAS2109E exhibits reduced mechanical life (2,000 cycles versus 5,000 cycles for the DA09T) and lower current capacity.

Selection of the KAS2109E is appropriate for applications where circuit current requirements do not exceed 25mA at 24VDC. Applications requiring the full 50mA current rating of the DA09T require alternative sourcing or component redesign.

Frequently Asked Questions (FAQ)

Q: Can the KAS2109E directly replace the DA09T in existing designs?

A: Direct replacement is possible only if the application circuit current does not exceed 25mA. The KAS2109E maintains identical mechanical footprint, pitch, height, and mounting configuration. If the circuit requires 50mA operation, the KAS2109E is not suitable.

Q: What are the key differences between these two components?

A: The primary differences are current rating (DA09T: 50mA, KAS2109E: 25mA), mechanical life (DA09T: 5,000 cycles, KAS2109E: 2,000 cycles), and operating temperature range (DA09T: -20°C to 70°C, KAS2109E: -40°C to 85°C). All other electrical and mechanical parameters are equivalent.

Q: Are both components RoHS compliant?

A: Yes, both the DA09T and KAS2109E are ROHS3 compliant and carry MSL 1 moisture sensitivity ratings.

Q: What is the pitch specification and why does it matter?

A: Both components use 0.100" (2.54mm) pitch, which is the standard spacing between switch positions. This specification ensures compatibility with existing PCB layouts designed for the DA09T.

Q: Does the KAS2109E require different handling or storage procedures?

A: No. Both components carry identical MSL 1 (Unlimited) moisture sensitivity levels, requiring no special moisture control during storage or handling.