ADF04ST Equivalent & Substitute Parts

Part Overview

The ADF04ST is a surface mount DIP switch manufactured by TE Connectivity ALCOSWITCH Switches. This component is a 4-position SPST slide switch rated for 25mA at 24VDC, featuring a flush/recessed actuator, gold-plated copper alloy contacts, and polyphenylene sulfide (PPS) body material. The ADF04ST is classified as obsolete, necessitating identification of equivalent substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across circuit topology, electrical ratings, and mechanical form factor.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single Pole Single Throw)
Number of Positions	4
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Actuator Level	Flush, Recessed
Mounting Type	Surface Mount
Termination Style	Gull Wing
Pitch	0.100" (2.54mm)
Contact Material	Copper Alloy
Contact Finish	Gold
Operating Temperature Range	-30°C to 85°C
Washable	Yes

Substitute Part Grouping Explanation

Substitute parts for the ADF04ST are identified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Electrical Compatibility: Circuit configuration (SPST), number of positions (4), and voltage/current ratings must support the intended application. The ADF04ST operates at 25mA and 24VDC; substitute parts must either match these ratings or provide equal or greater capacity.

Mechanical Compatibility: Surface mount mounting type, gull wing termination, 0.100" pitch, and flush/recessed actuator level must be maintained to ensure PCB footprint compatibility and assembly process alignment.

Physical Form Factor: Height above board, length, and overall dimensions must be compatible with existing PCB layouts and enclosure constraints.

Material and Finish: Gold-plated contacts and polyphenylene sulfide body material establish baseline reliability and environmental resistance standards.

The following substitute parts meet these criteria:

1-1825059-7 (TE Connectivity ALCOSWITCH Switches) – Direct electrical and mechanical equivalent with active product status and RoHS3 compliance
219-4LPST (CTS Electrocomponents) – Functional equivalent with enhanced electrical ratings and extended temperature range

Parameter Comparison

Parameter	ADF04ST	1-1825059-7	219-4LPST
Manufacturer	TE Connectivity ALCOSWITCH Switches	TE Connectivity ALCOSWITCH Switches	CTS Electrocomponents
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating	25mA	25mA	100mA
Voltage Rating	24VDC	24VDC	20VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Flush, Recessed	Flush, Recessed	Flush, Recessed
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Termination Style	Gull Wing	Gull Wing	Gull Wing
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Material	Copper Alloy	Copper Alloy	Beryllium Copper
Contact Finish	Gold	Gold	Gold
Height Above Board	0.177" (4.50mm)	0.177" (4.50mm)	0.160" (4.06mm)
Length	0.478" (12.14mm)	0.478" (12.14mm)	0.458" (11.63mm)
Operating Temperature Range	-30°C to 85°C	-30°C to 85°C	-55°C to 85°C
Washable	Yes	Yes	Yes
Electrical Life	1,000 Cycles	1,000 Cycles	2,000 Cycles
RoHS Status	RoHS Non-Compliant	RoHS3 Compliant	RoHS3 Compliant
Packaging	Bulk	Tube	Tube

Engineering Selection Recommendations

1-1825059-7 (Primary Substitute)

The 1-1825059-7 is the direct functional equivalent of the ADF04ST. Both components share identical electrical ratings (25mA, 24VDC), circuit configuration (SPST, 4-position), mechanical form factor (surface mount, gull wing, 0.100" pitch), and operating temperature range (-30°C to 85°C). The 1-1825059-7 maintains active product status and achieves RoHS3 compliance, addressing regulatory requirements for new production. This part is the preferred substitute for direct replacement applications where the ADF04ST is currently specified.

219-4LPST (Alternative Substitute)

The 219-4LPST is a functional equivalent manufactured by CTS Electrocomponents. This part maintains SPST 4-position configuration, surface mount mounting, gull wing termination, and 0.100" pitch compatibility. The 219-4LPST provides enhanced electrical ratings (100mA at 20VDC) and extended operating temperature range (-55°C to 85°C), supporting applications requiring higher current capacity or broader temperature performance. The 219-4LPST achieves RoHS3 compliance and offers 2,000 electrical life cycles compared to 1,000 cycles for the ADF04ST. Physical dimensions are comparable (height 0.160" vs. 0.177", length 0.458" vs. 0.478"), with minor variations that typically remain within PCB layout tolerances for standard DIP switch footprints.

Selection between 1-1825059-7 and 219-4LPST depends on application-specific requirements. Use 1-1825059-7 for direct replacement with identical electrical specifications. Use 219-4LPST when higher current capacity, extended temperature range, or increased electrical life cycles provide design advantages.

Frequently Asked Questions (FAQ)

Q: Can the 1-1825059-7 be used as a direct replacement for the ADF04ST?

A: Yes. The 1-1825059-7 is electrically and mechanically identical to the ADF04ST. Both components feature 25mA at 24VDC ratings, SPST 4-position configuration, surface mount gull wing termination at 0.100" pitch, and identical operating temperature range (-30°C to 85°C). The 1-1825059-7 is the recommended substitute for applications currently using the obsolete ADF04ST.

Q: What are the key differences between the 1-1825059-7 and 219-4LPST?

A: The 1-1825059-7 matches the ADF04ST exactly in electrical ratings (25mA, 24VDC) and operating temperature (-30°C to 85°C). The 219-4LPST provides higher current capacity (100mA), lower voltage rating (20VDC), extended temperature range (-55°C to 85°C), and doubled electrical life (2,000 cycles vs. 1,000 cycles). Physical dimensions differ slightly: 219-4LPST is 0.160" tall and 0.458" long compared to 0.177" and 0.478" for the ADF04ST/1-1825059-7. Contact material differs: 219-4LPST uses beryllium copper versus copper alloy in the ADF04ST.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the 1-1825059-7 and 219-4LPST are RoHS3 compliant. The original ADF04ST is RoHS non-compliant, making either substitute suitable for applications requiring RoHS compliance.

Q: Will the 219-4LPST fit the same PCB footprint as the ADF04ST?

A: The 219-4LPST maintains the same pitch (0.100"), mounting type (surface mount), and termination style (gull wing) as the ADF04ST. Physical dimensions are comparable with minor variations: height 0.160" (vs. 0.177") and length 0.458" (vs. 0.478"). These differences typically remain within standard DIP switch footprint tolerances and do not prevent PCB compatibility. Verify specific PCB layout constraints for height and length clearances in your application.

Q: Can the 219-4LPST be used in applications rated for 24VDC?

A: The 219-4LPST is rated for 20VDC maximum. Applications requiring 24VDC operation must use the 1-1825059-7, which is rated for 24VDC. Do not exceed the 219-4LPST voltage rating.

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

A: The ADF04ST is supplied in bulk packaging. Both substitute parts (1-1825059-7 and 219-4LPST) are supplied in tube packaging, which provides improved component protection and handling during assembly and storage.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring specifications identical to the ADF04ST (25mA, 24VDC, -30°C to 85°C), use the 1-1825059-7. For applications where higher current capacity (100mA), extended temperature range (-55°C to 85°C), or increased electrical life (2,000 cycles) provide design benefits, use the 219-4LPST. Both parts are active products with RoHS3 compliance suitable for production use.

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