ADF08S Equivalent & Substitute Parts

Part Overview

The ADF08S is an 8-position surface mount DIP switch manufactured by TE Connectivity ALCOSWITCH Switches. This component is a single-pole single-throw (SPST) slide-actuated switch rated for 25mA at 24VDC, designed for applications requiring compact, washable switching functionality. The ADF08S is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing production support, design updates, and inventory management.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single-Pole Single-Throw)
Number of Positions	8
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Mounting Type	Surface Mount
Termination Style	Gull Wing
Pitch	0.100" (2.54mm)
Operating Temperature Range	-30°C to 85°C
Contact Material	Copper Alloy
Contact Finish	Gold
Height Above Board	0.177" (4.50mm)
Washable	Yes

Substitute Part Grouping Explanation

Substitution of the ADF08S is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Circuit configuration (SPST)
Number of positions (8)
Mounting type (Surface Mount)
Termination style (Gull Wing)
Pitch spacing (0.100" / 2.54mm)
Actuator type (Slide Standard)
Washable capability

Secondary Compatibility Parameters:

Current rating must equal or exceed 25mA
Voltage rating must equal or exceed 24VDC
Operating temperature range must encompass or exceed -30°C to 85°C
Physical footprint compatibility (height, length, pitch)

The substitute parts listed below meet these criteria with the following considerations:

3-1825059-7 (TE Connectivity ALCOSWITCH Switches): Identical electrical and mechanical specifications to the ADF08S. This part represents the active production equivalent with improved RoHS3 compliance status.

219-8LPST (CTS Electrocomponents): Functionally compatible with higher electrical ratings (100mA at 20VDC) and extended mechanical life (2,000 cycles). Physical dimensions vary slightly; verification of board layout compatibility is required.

Parameter Comparison

Parameter	ADF08S	3-1825059-7	219-8LPST
Manufacturer	TE Connectivity ALCOSWITCH	TE Connectivity ALCOSWITCH	CTS Electrocomponents
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	8	8	8
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
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)
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)
Length	0.878" (22.30mm)	0.878" (22.30mm)	0.858" (21.80mm)
Washable	Yes	Yes	Yes
Operating Temperature	-30°C to 85°C	-30°C to 85°C	-55°C to 85°C
Electrical Life	1,000 Cycles	1,000 Cycles	2,000 Cycles
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging	Bulk	Tube	Tube

Engineering Selection Recommendations

3-1825059-7 Selection Criteria:

The 3-1825059-7 is the direct active production equivalent of the ADF08S. This part maintains identical electrical specifications (25mA at 24VDC), mechanical configuration, and physical footprint. The primary advantage is active product status and ROHS3 compliance, making it the preferred choice for new designs and production continuity. No design modifications are required for direct substitution. Packaging is supplied in tube format.

219-8LPST Selection Criteria:

The 219-8LPST is a functionally compatible alternative from CTS Electrocomponents. This part exceeds the electrical requirements of the ADF08S (100mA at 20VDC versus 25mA at 24VDC) and provides extended electrical life (2,000 cycles versus 1,000 cycles). The operating temperature range is expanded to -55°C to 85°C. Physical dimensions differ slightly (height 0.160" versus 0.177", length 0.858" versus 0.878"), requiring verification of board layout compatibility. This part is suitable for applications where higher current capacity or extended operational life is beneficial. ROHS3 compliance and active product status are confirmed.

Compliance Considerations:

Both substitute parts achieve ROHS3 compliance and REACH unaffected status, addressing regulatory requirements not met by the obsolete ADF08S. Selection between 3-1825059-7 and 219-8LPST depends on application-specific requirements for current capacity, temperature range, and mechanical life, balanced against board layout constraints.

Frequently Asked Questions (FAQ)

Q: Can the 3-1825059-7 be used as a direct replacement for the ADF08S without design changes?

A: Yes. The 3-1825059-7 maintains identical electrical ratings (25mA at 24VDC), mechanical configuration, physical footprint, and termination style. Direct substitution on existing PCB layouts is supported without modification.

Q: What are the key differences between the 3-1825059-7 and 219-8LPST?

A: The 3-1825059-7 is electrically and mechanically identical to the ADF08S. The 219-8LPST offers higher current capacity (100mA versus 25mA), extended electrical life (2,000 cycles versus 1,000 cycles), and expanded operating temperature range (-55°C to 85°C). Physical dimensions differ: the 219-8LPST is 0.17mm shorter in height and 0.20mm shorter in length. Contact material differs (Beryllium Copper versus Copper Alloy).

Q: Is the 219-8LPST suitable for applications requiring 24VDC operation?

A: The 219-8LPST is rated for 20VDC maximum. Applications requiring 24VDC operation must use either the ADF08S or 3-1825059-7. The 219-8LPST is not suitable for 24VDC circuits.

Q: What is the impact of the height difference between the ADF08S and 219-8LPST?

A: The 219-8LPST has a height of 0.160" (4.06mm) compared to the ADF08S at 0.177" (4.50mm), a difference of 0.017" (0.44mm). This difference may affect clearance in applications with tight vertical constraints. PCB layout verification is required before substitution.

Q: Are both substitute parts washable?

A: Yes. Both the 3-1825059-7 and 219-8LPST are washable, maintaining compatibility with cleaning processes specified for the ADF08S.

Q: What is the difference in packaging between the ADF08S and substitute parts?

A: The ADF08S is supplied in bulk packaging. Both substitute parts (3-1825059-7 and 219-8LPST) are supplied in tube packaging, which provides improved component protection and handling during assembly operations.

Q: Does the 219-8LPST require any design modifications for substitution?

A: Physical dimension verification is required. The 219-8LPST differs in height (0.160" versus 0.177") and length (0.858" versus 0.878"). Board layout compatibility must be confirmed. Additionally, the voltage rating is 20VDC maximum; applications requiring 24VDC operation cannot use this part.

Q: What is the electrical life difference between the substitute parts?

A: The 3-1825059-7 maintains the same electrical life as the ADF08S at 1,000 cycles. The 219-8LPST provides extended electrical life of 2,000 cycles, offering improved durability for high-cycle applications.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the 3-1825059-7 and 219-8LPST are ROHS3 compliant. The original ADF08S is RoHS non-compliant, making substitution necessary for applications subject to RoHS regulations.

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