ADF03T Equivalent & Substitute Parts

Part Overview

The ADF03T is a DIP slide switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a single-pole single-throw (SPST) switch with 3 positions. This component is rated for 25mA at 24VDC and features a through-hole mounting design with a standard slide actuator. The ADF03T is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support, maintenance, and production continuity.

Substiute Parts

ADF03T

TE Connectivity ALCOSWITCH SwitchesIn Stock: 1008ADF03T Datasheet

Current PartRFQ

209-3LPST

CTS ElectrocomponentsIn Stock: 11718209-3LPST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ADF03T is determined by compatibility across the following critical parameters:

Electrical Compatibility: The substitute part must support SPST circuit configuration with 3 positions. The ADF03T operates at 25mA and 24VDC; substitute parts must have current and voltage ratings that equal or exceed these specifications to ensure safe operation in the original application circuit.

Mechanical Compatibility: The substitute must feature a slide-type actuator with flush or recessed actuation level, through-hole mounting, and PC pin termination. The 0.100" (2.54mm) pitch is a standard footprint requirement for direct board-level substitution without layout modification.

Physical Dimensions: Height above board and overall length must be compatible with the original PCB design constraints. The substitute part 209-3LPST meets these mechanical requirements.

Contact Material and Finish: Gold-plated contacts are specified for the ADF03T. The substitute maintains gold contact finish for equivalent electrical performance and reliability.

Environmental and Operational Requirements: The substitute must support the washable feature and operate within the specified temperature range. Additional certifications such as RoHS compliance are considered for long-term supply chain viability.

Parameter Comparison

Engineering Selection Recommendations

The 209-3LPST from CTS Electrocomponents is identified as a functional substitute for the obsolete ADF03T. The substitute maintains mechanical and electrical compatibility across all critical parameters including circuit configuration, actuator type, mounting style, and pitch.

Voltage Rating Consideration: The 209-3LPST is rated for 20VDC, which is below the ADF03T specification of 24VDC. This represents a voltage derating of 4VDC. Applications operating at or below 20VDC are fully compatible. Applications requiring operation at 24VDC must be evaluated against actual circuit voltage levels and safety margins.

Current Rating: The 209-3LPST current rating of 100mA exceeds the ADF03T requirement of 25mA, providing additional capacity margin.

Product Status and Compliance: The 209-3LPST is actively manufactured and ROHS3 compliant, ensuring long-term availability and alignment with current regulatory requirements. The ADF03T is obsolete and RoHS non-compliant.

Environmental Performance: The 209-3LPST supports an extended operating temperature range of -40°C to 85°C compared to the ADF03T range of -30°C to 85°C, and provides double the electrical life rating at 2,000 cycles versus 1,000 cycles.

Physical Compatibility: Both components share identical pitch (0.100"), similar height above board (0.180" vs 0.189"), and comparable length (0.358" vs 0.378"), ensuring direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the 209-3LPST directly replace the ADF03T without PCB modification?

A: Yes. Both components share the same 0.100" (2.54mm) pitch, through-hole PC pin termination, and similar physical dimensions. Direct substitution on the PCB is possible without layout changes.

Q: What is the voltage rating limitation of the 209-3LPST?

A: The 209-3LPST is rated for 20VDC maximum, compared to the ADF03T rating of 24VDC. Applications operating at 20VDC or below are fully compatible. Applications requiring 24VDC operation must confirm actual circuit voltage levels and verify that the 20VDC rating provides adequate safety margin for the specific application.

Q: Does the 209-3LPST meet current regulatory compliance standards?

A: Yes. The 209-3LPST is ROHS3 compliant and actively manufactured. The ADF03T is RoHS non-compliant and obsolete. The 209-3LPST is suitable for new designs and ongoing production requiring current regulatory alignment.

Q: Are the mechanical dimensions compatible?

A: Yes. The 209-3LPST height above board is 0.180" (4.57mm) compared to 0.189" (4.80mm) for the ADF03T, and length is 0.358" (9.09mm) compared to 0.378" (9.60mm). These minor dimensional differences are within typical PCB design tolerances and do not affect mechanical fit or functionality.

Q: What is the difference in electrical life between these components?

A: The 209-3LPST provides 2,000 electrical cycles compared to 1,000 cycles for the ADF03T, representing a 2x improvement in cycle life rating.

Q: What packaging is available for the 209-3LPST?

A: The 209-3LPST is supplied in tube packaging. The ADF03T packaging specification was not provided in the original documentation.

Q: Are both components washable?

A: Yes. Both the ADF03T and 209-3LPST support washable operation, enabling compatibility with standard PCB cleaning processes.