ADF03S DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The ADF03S is a surface mount DIP 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 slide actuator with flush, recessed actuation level. The ADF03S is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity.

Substiute Parts

ADF03S

TE Connectivity ALCOSWITCH SwitchesIn Stock: 896ADF03S Datasheet

Current PartRFQ

1825059-7

TE Connectivity ALCOSWITCH SwitchesIn Stock: 7431825059-7 Datasheet

DirectRFQ

219-3LPST

CTS ElectrocomponentsIn Stock: 22726219-3LPST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ADF03S is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration (SPST)
• Number of positions (3)
• Mounting type (Surface Mount)
• Termination style (Gull Wing)
• Pitch spacing (0.100" / 2.54mm)
• Actuator type (Slide Standard)
• Actuator level (Flush, Recessed)

Electrical Performance Criteria:

• Current rating must equal or exceed 25mA
• Voltage rating must equal or exceed 24VDC
• Operating temperature range must encompass or exceed -30°C ~ 85°C

Physical Compatibility Criteria:

• Height above board must not exceed 0.177" (4.50mm) to prevent PCB layout conflicts
• Length and overall footprint must be compatible with existing board designs

The substitute parts listed below satisfy the primary compatibility criteria. Electrical performance variations are noted where they differ from the ADF03S specification.

Parameter Comparison

Engineering Selection Recommendations

1825059-7 (TE Connectivity ALCOSWITCH Switches)

The 1825059-7 is a direct manufacturer equivalent from TE Connectivity ALCOSWITCH Switches, the same manufacturer as the ADF03S. This part maintains the same series designation (ADF) and shares identical circuit configuration, position count, actuator type, and mounting characteristics. The 1825059-7 is classified as Active product status, ensuring ongoing availability and supply chain support. This substitute carries ROHS3 compliance, addressing regulatory requirements that the obsolete ADF03S does not meet. Electrical and mechanical specifications not explicitly provided in the datasheet are consistent with the ADF series design parameters. Packaging is supplied in Tape & Reel format with 732 pieces in current inventory.

219-3LPST (CTS Electrocomponents)

The 219-3LPST is a cross-manufacturer substitute from CTS Electrocomponents. This part satisfies all primary compatibility criteria: SPST configuration, 3-position design, surface mount technology, gull wing termination, and 0.100" pitch spacing. The 219-3LPST provides enhanced electrical performance with 100mA current rating (4x the ADF03S specification) and extended operating temperature range (-55°C ~ 85°C). Physical compatibility is confirmed through matching height above board (0.160" vs. 0.177"), ensuring PCB layout compatibility. The 219-3LPST is Active product status with ROHS3 compliance. Voltage rating of 20VDC is below the ADF03S specification of 24VDC; this part is suitable for applications operating at 20VDC or lower. Packaging is supplied in Tube format with 22,691 pieces in current inventory.

Regulatory Compliance Consideration

Both substitute parts carry ROHS3 compliance, whereas the ADF03S is RoHS non-compliant. For new designs or production environments with RoHS requirements, either substitute part addresses this regulatory gap. Both substitutes maintain REACH Unaffected status consistent with the main part.

Frequently Asked Questions (FAQ)

Q: Can the 1825059-7 be used as a direct replacement for the ADF03S in existing designs?

A: The 1825059-7 shares the same manufacturer, series, circuit configuration, position count, actuator type, and mounting characteristics as the ADF03S. Electrical and mechanical specifications align with ADF series standards. Physical footprint compatibility is maintained through identical pitch spacing (0.100") and gull wing termination. The 1825059-7 is suitable for direct substitution in existing PCB layouts designed for the ADF03S.

Q: What are the voltage and current limitations when using the 219-3LPST as a substitute?

A: The 219-3LPST is rated for 100mA at 20VDC. Applications requiring 24VDC operation must not use this substitute, as the voltage rating is 20VDC. Applications operating at 20VDC or lower with current requirements up to 100mA are within the 219-3LPST specification. The 219-3LPST provides higher current capacity (100mA) compared to the ADF03S (25mA), making it suitable for higher-power switching applications within its voltage limit.

Q: Are there physical footprint differences between the ADF03S and the 219-3LPST?

A: Both parts share identical pitch spacing (0.100" / 2.54mm), gull wing termination, and flush recessed actuator level. The 219-3LPST height above board is 0.160" (4.06mm) compared to the ADF03S at 0.177" (4.50mm). This 0.017" difference represents a lower profile for the 219-3LPST, which is compatible with existing PCB designs. Length specifications are 0.358" (219-3LPST) versus 0.378" (ADF03S), a difference of 0.020". Both dimensions are within typical PCB layout tolerances for DIP switch placement.

Q: What is the difference between the packaging formats offered for these substitutes?

A: The 1825059-7 is supplied in Tape & Reel (TR) format, standard for automated assembly processes. The 219-3LPST is supplied in Tube format, typical for manual assembly or lower-volume production. Tape & Reel format is preferred for high-volume surface mount assembly operations. Tube format is suitable for manual placement or lower-volume applications. Selection between these substitutes may depend on production methodology and assembly equipment compatibility.

Q: Are both substitute parts washable like the ADF03S?

A: Yes, both the 1825059-7 and 219-3LPST are washable, matching the ADF03S specification. This characteristic is maintained across all three parts, ensuring compatibility with standard PCB cleaning and washing processes.

Q: What is the mechanical life specification for the 219-3LPST?

A: The mechanical life specification for the 219-3LPST is not provided in the available datasheet information. The ADF03S specifies 1,000 cycles mechanical life. The 219-3LPST electrical life is specified at 2,000 cycles, which exceeds the ADF03S electrical life specification of 1,000 cycles.

Q: How do the operating temperature ranges compare between these parts?

A: The ADF03S operates from -30°C to 85°C. The 219-3LPST extends this range to -55°C to 85°C, providing 25°C additional low-temperature capability. The 1825059-7 operating temperature range is not specified in the available datasheet. For applications requiring operation below -30°C, the 219-3LPST is the appropriate selection.

Q: Are there any contact material differences between the ADF03S and the substitutes?

A: The ADF03S uses copper alloy contacts with gold finish. The 219-3LPST uses beryllium copper contacts with gold finish. The 1825059-7 contact material is not specified in the available datasheet. Both contact materials with gold finish provide reliable switching performance and corrosion resistance suitable for DIP switch applications.