DA03 DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The DA03 is a slide-actuated DIP switch manufactured by APEM Inc., configured as a single-pole single-throw (SPST) switch with 3 positions. It is rated for 50mA at 24VDC and features through-hole, right-angle mounting with gold-plated phosphor bronze contacts. The DA03 is classified as obsolete, making identification of functionally equivalent active alternatives necessary for new designs and ongoing production requirements.

Substiute Parts

DA03

APEM Inc.In Stock: 1105DA03 Datasheet

Current PartRFQ

NDA-03-V

APEM Inc.In Stock: 996NDA-03-V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DA03 is determined by the following critical parameters:

• Circuit Configuration: SPST topology must be maintained
• Number of Positions: 3-position requirement
• Voltage Rating: 24VDC operation
• Mounting Interface: Through-hole, right-angle configuration with 0.100" (2.54mm) pitch
• Physical Envelope: Height above board of 0.390" (9.90mm) and compatible length dimensions
• Actuator Type: Slide-actuated mechanism with raised actuator level
• Contact Finish: Gold plating for corrosion resistance and reliable electrical contact

The NDA-03-V qualifies as a substitute based on matching all critical parameters. The primary difference is a reduced current rating (25mA versus 50mA), which represents a design constraint rather than an incompatibility. Applications requiring the full 50mA capacity must evaluate this limitation against circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The NDA-03-V is the active equivalent for the obsolete DA03. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs. The NDA-03-V is currently in active production with 961 units in stock, providing supply continuity.

The primary selection criterion is current capacity. The NDA-03-V operates at 25mA maximum, compared to the DA03's 50mA rating. Circuit designs operating below 25mA at 24VDC can directly substitute the NDA-03-V without modification. Designs requiring 25mA to 50mA operation must evaluate alternative switch families or confirm that the reduced current rating is acceptable for the application.

Both parts share identical mechanical interfaces, pitch spacing, and mounting orientation, eliminating PCB layout redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can the NDA-03-V directly replace the DA03 in existing designs?

A: Physical and electrical interfaces are compatible. The NDA-03-V can be installed in DA03 footprints without PCB modification. However, circuit current requirements must not exceed 25mA. If the original design draws 25mA to 50mA, the NDA-03-V is not suitable without circuit redesign.

Q: What is the pitch spacing for both parts?

A: Both the DA03 and NDA-03-V use 0.100" (2.54mm) full pitch spacing, standard for DIP switch families.

Q: Are there differences in mechanical life between the two parts?

A: The DA03 specifies 5,000 mechanical cycles. The NDA-03-V does not provide a mechanical life specification in the available data. Both parts specify 2,000 electrical cycles.

Q: Do both parts require the same mounting orientation?

A: Yes. Both are through-hole, right-angle mounted switches with identical height above board (0.390" / 9.90mm) and raised actuator configuration.

Q: What is the temperature operating range for both parts?

A: Both the DA03 and NDA-03-V operate across -20°C to 70°C.

Q: Are there compliance differences between the DA03 and NDA-03-V?

A: Both parts are ROHS3 compliant and REACH unaffected. No compliance barriers exist for substitution.