ADF08ST Equivalent & Substitute Parts

Part Overview

The ADF08ST is a DIP slide switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a single-pole single-throw (SPST) 8-position surface mount component. This switch is rated for 25mA at 24VDC and features a standard slide actuator with flush, recessed positioning. The ADF08ST is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain functional compatibility across circuit topology, electrical ratings, and mechanical mounting characteristics.

Substiute Parts

ADF08ST

TE Connectivity ALCOSWITCH SwitchesIn Stock: 725ADF08ST Datasheet

Current PartRFQ

4-1825059-1

TE Connectivity ALCOSWITCH SwitchesIn Stock: 338174-1825059-1 Datasheet

DirectRFQ

219-8LPST

CTS ElectrocomponentsIn Stock: 28509219-8LPST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADF08ST are evaluated based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters (Must Match):

• Circuit topology: SPST configuration
• Position count: 8 positions
• Mounting method: Surface mount with gull wing termination
• Pitch spacing: 0.100" (2.54mm)
• Actuator style: Slide (standard) with flush/recessed level

Electrical Parameters (Must Meet or Exceed):

• Current rating: Minimum 25mA
• Voltage rating: Minimum 24VDC

Mechanical Parameters (Must Align):

• Termination style: Gull wing
• Mounting footprint compatibility

Substitute parts are grouped into two categories: direct equivalents (identical electrical and mechanical specifications) and functional substitutes (compatible electrical and mechanical characteristics with potential parameter variations).

Parameter Comparison

Engineering Selection Recommendations

4-1825059-1 (Primary Substitute)

The 4-1825059-1 is the direct equivalent to the ADF08ST. Both parts share identical electrical ratings (25mA at 24VDC), mechanical dimensions, and circuit configuration. The 4-1825059-1 is manufactured by the same supplier (TE Connectivity ALCOSWITCH Switches) and maintains the same series designation (ADF). This part is currently in active production status with 33,779 units in stock, providing supply continuity. The 4-1825059-1 achieves ROHS3 compliance, addressing regulatory requirements that the obsolete ADF08ST does not meet. This substitute is suitable for direct replacement in all applications where the ADF08ST was originally specified.

219-8LPST (Functional Substitute)

The 219-8LPST is a functional substitute manufactured by CTS Electrocomponents. This part maintains the same circuit topology (SPST), position count (8), mounting method (surface mount), and pitch spacing (0.100"). The 219-8LPST provides enhanced electrical performance with a 100mA current rating, exceeding the ADF08ST requirement of 25mA. However, the voltage rating is 20VDC, which is 4VDC lower than the ADF08ST specification of 24VDC. The 219-8LPST features an extended operating temperature range (-55°C ~ 85°C) and increased electrical life (2,000 cycles). This part is suitable for applications where the 20VDC rating is acceptable and where the higher current capacity provides design margin. The 219-8LPST is ROHS3 compliant and currently in active production with 28,447 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the 4-1825059-1 be used as a direct replacement for the ADF08ST?

A: Yes. The 4-1825059-1 is a direct equivalent with identical electrical ratings (25mA at 24VDC), mechanical dimensions, and circuit configuration. Both parts are manufactured by TE Connectivity ALCOSWITCH Switches within the same ADF series. The primary difference is product status: the ADF08ST is obsolete while the 4-1825059-1 is active production.

Q: What are the limitations of using the 219-8LPST as a substitute?

A: The 219-8LPST has a voltage rating of 20VDC, which is 4VDC lower than the ADF08ST specification of 24VDC. Applications requiring the full 24VDC rating cannot use this substitute. The 219-8LPST is suitable only for circuits operating at 20VDC or lower. The current rating of 100mA exceeds the ADF08ST requirement and presents no limitation.

Q: Are there packaging differences between the substitute parts?

A: Yes. The ADF08ST is packaged in bulk format. The 4-1825059-1 is also packaged in bulk. The 219-8LPST is packaged in tube format. Packaging differences may affect procurement processes and handling procedures but do not impact electrical or mechanical compatibility.

Q: Do the substitute parts meet current regulatory requirements?

A: Both substitute parts (4-1825059-1 and 219-8LPST) are ROHS3 compliant. The original ADF08ST is RoHS non-compliant. For applications subject to RoHS regulations, either substitute part addresses compliance requirements. The 219-8LPST is REACH Unaffected; the 4-1825059-1 has Vendor Undefined REACH status.

Q: What is the mechanical footprint compatibility between these parts?

A: All three parts share identical pitch spacing (0.100" or 2.54mm), gull wing termination style, and surface mount mounting type. The 4-1825059-1 has identical height above board (0.177" or 4.50mm) and length (0.878" or 22.30mm) to the ADF08ST. The 219-8LPST has a slightly lower height (0.160" or 4.06mm) and shorter length (0.858" or 21.80mm). These minor dimensional variations may require PCB layout verification in space-constrained applications.

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

A: For new designs requiring exact electrical specifications (25mA at 24VDC), the 4-1825059-1 is the appropriate selection. This part provides direct equivalence with active production status and regulatory compliance. The 219-8LPST is suitable only for applications where the 20VDC maximum voltage rating is acceptable and where the higher current capacity provides design benefit.