ADF02ST Equivalent & Substitute Parts

Part Overview

The ADF02ST is a surface mount DIP slide switch manufactured by TE Connectivity ALCOSWITCH Switches. This component is a single-pole, single-throw (SPST) switch rated for 25mA at 24VDC with a 2-position slide actuator. The ADF02ST is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across circuit topology, electrical ratings, and mechanical form factor to ensure direct replacement capability.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single-Pole, Single-Throw)
Number of Positions	2
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)
Height Above Board	0.177" (4.50mm)
Operating Temperature Range	-30°C to 85°C
Contact Material	Copper Alloy
Contact Finish	Gold
Body Material	Polyphenylene Sulfide (PPS)

Substitute Part Grouping Explanation

Substitution eligibility for the ADF02ST is determined by strict adherence to the following parameters:

Primary Compatibility Criteria:

Circuit configuration must be SPST
Number of positions must be 2
Actuator type must be Slide (Standard)
Mounting type must be Surface Mount
Termination style must be Gull Wing
Pitch must be 0.100" (2.54mm)

Electrical Compatibility Criteria:

Current rating must be equal to or greater than 25mA
Voltage rating must be equal to or greater than 24VDC
Operating temperature range must encompass or exceed -30°C to 85°C

Mechanical Compatibility Criteria:

Height above board must not exceed 0.177" (4.50mm)
Actuator level must be Flush or Recessed
Contact finish must be Gold

The substitute parts identified meet these criteria with the following considerations:

1825059-5 (TE Connectivity ALCOSWITCH Switches): Identical electrical and mechanical specifications to ADF02ST. Differs only in product status (Active vs. Obsolete) and RoHS compliance status (ROHS3 Compliant vs. non-compliant).

219-2LPST (CTS Electrocomponents): Meets primary compatibility criteria with enhanced electrical ratings (100mA at 20VDC). Mechanical dimensions are within acceptable tolerance (Height: 0.160" vs. 0.177"). Extended operating temperature range (-55°C to 85°C) provides broader environmental coverage. Contact material differs (Beryllium Copper vs. Copper Alloy) but maintains Gold finish specification.

Parameter Comparison

Parameter	ADF02ST	1825059-5	219-2LPST
Manufacturer	TE Connectivity ALCOSWITCH Switches	TE Connectivity ALCOSWITCH Switches	CTS Electrocomponents
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	2	2	2
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)
Height Above Board	0.177" (4.50mm)	0.177" (4.50mm)	0.160" (4.06mm)
Contact Material	Copper Alloy	Copper Alloy	Beryllium Copper
Contact Finish	Gold	Gold	Gold
Operating Temperature Range	-30°C to 85°C	-30°C to 85°C	-55°C to 85°C
Body Material	Polyphenylene Sulfide (PPS)	Polyphenylene Sulfide (PPS)	Not Specified
Mechanical Life	1,000 Cycles	1,000 Cycles	Not Specified
Electrical Life	1,000 Cycles	1,000 Cycles	2,000 Cycles
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Washable	Yes	Yes	Yes

Engineering Selection Recommendations

1825059-5 Selection Criteria:

The 1825059-5 is the direct functional equivalent of the ADF02ST with identical electrical and mechanical specifications. This part is manufactured by the same supplier (TE Connectivity ALCOSWITCH Switches) and maintains the same series designation (ADF). The primary distinction is product status: 1825059-5 is Active, whereas ADF02ST is Obsolete. Additionally, 1825059-5 carries ROHS3 compliance certification, addressing regulatory requirements for new designs and production runs. This part is suitable for direct replacement in all applications where the ADF02ST was previously specified.

219-2LPST Selection Criteria:

The 219-2LPST is a compatible substitute manufactured by CTS Electrocomponents. This part meets all primary compatibility criteria and provides enhanced electrical performance with a 100mA current rating compared to the 25mA rating of ADF02ST. The voltage rating of 20VDC is lower than the 24VDC specification of ADF02ST; however, this part is suitable only for applications where the actual operating voltage does not exceed 20VDC. The 219-2LPST offers an extended operating temperature range (-55°C to 85°C) and increased electrical life (2,000 cycles vs. 1,000 cycles). Mechanical dimensions are compatible with a reduced height above board (0.160" vs. 0.177"). This part carries ROHS3 compliance and is classified as Active. Selection of 219-2LPST is appropriate for applications requiring enhanced current capacity and extended environmental operating range, provided voltage requirements do not exceed 20VDC.

Frequently Asked Questions (FAQ)

Q: Can the 1825059-5 be used as a direct replacement for the ADF02ST?

A: Yes. The 1825059-5 is electrically and mechanically identical to the ADF02ST. Both parts share the same current rating (25mA), voltage rating (24VDC), actuator type (Slide Standard), mounting configuration (Surface Mount), and physical dimensions. The 1825059-5 is the recommended replacement due to its Active product status and ROHS3 compliance.

Q: What are the voltage limitations when using the 219-2LPST as a substitute?

A: The 219-2LPST is rated for 20VDC maximum, whereas the ADF02ST is rated for 24VDC. The 219-2LPST is suitable only for applications where the actual operating voltage does not exceed 20VDC. If your circuit operates at 24VDC, the 219-2LPST is not an appropriate substitute.

Q: Does the 219-2LPST fit in the same PCB footprint as the ADF02ST?

A: The 219-2LPST is mechanically compatible with the ADF02ST footprint. Both parts share identical pitch (0.100" / 2.54mm), termination style (Gull Wing), and actuator type (Slide Standard). The 219-2LPST has a slightly reduced height above board (0.160" vs. 0.177"), which does not create clearance conflicts. PCB layout compatibility is maintained.

Q: What is the difference in current handling capability between these parts?

A: The ADF02ST and 1825059-5 are both rated for 25mA. The 219-2LPST is rated for 100mA, providing four times the current capacity. If your application requires higher current switching capability, the 219-2LPST accommodates this requirement, subject to voltage rating constraints.

Q: Are all three parts RoHS compliant?

A: The ADF02ST is RoHS non-compliant. Both the 1825059-5 and 219-2LPST are ROHS3 compliant. For new designs or production runs subject to RoHS regulations, either the 1825059-5 or 219-2LPST must be selected.

Q: What is the operating temperature range for each part?

A: The ADF02ST and 1825059-5 operate from -30°C to 85°C. The 219-2LPST operates from -55°C to 85°C, providing an extended lower temperature limit. If your application requires operation below -30°C, the 219-2LPST is the appropriate selection.

Q: How do the contact materials differ between these parts?

A: The ADF02ST and 1825059-5 use Copper Alloy contacts with Gold finish. The 219-2LPST uses Beryllium Copper contacts with Gold finish. Both contact materials with Gold finish provide reliable switching performance. Beryllium Copper offers enhanced durability and is associated with the extended electrical life rating (2,000 cycles) of the 219-2LPST.

Q: What packaging options are available?

A: The ADF02ST is supplied in standard packaging (packaging type not specified). Both the 1825059-5 and 219-2LPST are supplied in Tube packaging, which is standard for component distribution and automated assembly processes.

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