DA03T DIP Switch SPST 24V Equivalent & Substitute Parts

Part Overview

The DA03T is a slide-actuated DIP switch manufactured by APEM Inc., designed for through-hole, right-angle mounting applications requiring low-current switching at 24VDC. This component features a 3-position SPST configuration with a 50mA current rating and gold-plated phosphor bronze contacts. The DA03T is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

DA03T

APEM Inc.In Stock: 780DA03T Datasheet

Current PartRFQ

KAS2103E

E-SwitchIn Stock: 1051KAS2103E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DA03T is determined by strict alignment with the following critical parameters:

• Circuit Configuration: Must be SPST to maintain single-pole, single-throw switching functionality
• Number of Positions: Must be 3-position to match the original design
• Voltage Rating: Must support 24VDC operation
• Mounting Type: Must be through-hole, right-angle to ensure PCB compatibility
• Pitch and Height: Must maintain 0.100" (2.54mm) pitch and 0.390" (9.90mm) height for mechanical fit
• Contact Material and Finish: Phosphor bronze with gold finish ensures electrical performance and reliability
• Termination Style: PC pin termination required for through-hole assembly

The KAS2103E from E-Switch meets all structural and electrical compatibility criteria for substitution. While the KAS2103E has a reduced current rating of 25mA compared to the DA03T's 50mA, this represents a derating that is acceptable in applications where the actual circuit current does not exceed 25mA. The substitute maintains identical voltage rating, circuit configuration, position count, mounting geometry, and contact materials.

Parameter Comparison

Engineering Selection Recommendations

The KAS2103E is the qualified substitute for the obsolete DA03T based on the following engineering criteria:

Compliance and Availability: The KAS2103E maintains ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original part. As an active product from E-Switch, the KAS2103E offers assured long-term availability and supply chain stability, addressing the primary limitation of the obsolete DA03T.

Electrical and Mechanical Compatibility: Both parts share identical circuit configuration (SPST), position count (3), voltage rating (24VDC), mounting geometry (through-hole, right-angle), pitch (0.100"), and height (0.390"). Contact materials and finishes are identical, ensuring equivalent electrical performance in the switching function.

Current Rating Consideration: The KAS2103E current rating of 25mA is lower than the DA03T's 50mA. This substitution is valid only for applications where the actual circuit current does not exceed 25mA. For applications requiring the full 50mA capability, alternative substitutes must be evaluated.

Operating Temperature and Mechanical Life: The KAS2103E provides a wider operating temperature range (-40°C to 85°C versus -20°C to 70°C), offering improved performance in extreme temperature environments. The DA03T's higher mechanical life rating (5,000 cycles versus 2,000 cycles) is not a limiting factor for the KAS2103E in typical DIP switch applications where cycle counts remain moderate.

Frequently Asked Questions (FAQ)

Q: Can the KAS2103E directly replace the DA03T in all applications?

A: Direct replacement is valid only if the application circuit current does not exceed 25mA. The KAS2103E is rated for 25mA maximum, while the DA03T is rated for 50mA. If your application requires the full 50mA capability, the KAS2103E is not suitable.

Q: Are the physical dimensions identical between DA03T and KAS2103E?

A: Yes. Both parts have identical pitch (0.100" / 2.54mm), height above board (0.390" / 9.90mm), and through-hole, right-angle mounting configuration. PCB layout and mechanical fit are compatible.

Q: What is the difference in packaging between these parts?

A: The DA03T is supplied in standard packaging, while the KAS2103E is supplied in tube packaging. This affects handling and storage but does not impact electrical or mechanical performance.

Q: Does the KAS2103E meet the same regulatory requirements as the DA03T?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components.

Q: Why does the KAS2103E have a lower mechanical life rating?

A: The DA03T is rated for 5,000 mechanical cycles while the KAS2103E is rated for 2,000 cycles. For typical DIP switch applications with infrequent position changes, the KAS2103E rating is sufficient. Applications requiring frequent switching should evaluate this parameter against actual usage patterns.

Q: Is the KAS2103E actively manufactured?

A: Yes. The KAS2103E is classified as an active product, ensuring ongoing availability and supply chain continuity, unlike the obsolete DA03T.