SP08A DIP Switch Equivalent & Substitute Parts

Part Overview

The SP08A is an 8-position DIP switch manufactured by C&K, featuring SPST circuit configuration with 10mA current rating and 20VDC voltage rating. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations. The switch utilizes a slide actuator with through-hole, right-angle mounting and gold-plated beryllium copper contacts suitable for PC pin termination.

Substiute Parts

SP08A

C&KIn Stock: 872SP08A Datasheet

Current PartRFQ

SPA08AB

C&KIn Stock: 987SPA08AB Datasheet

DirectRFQ

1977105-4

TE Connectivity ALCOSWITCH SwitchesIn Stock: 11231977105-4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SP08A are classified based on electrical and mechanical compatibility within the DIP switch category. The primary substitution criteria are:

Direct Electrical Compatibility Parameters:

• Circuit configuration (SPST)
• Number of positions (8)
• Current rating (10mA minimum)
• Voltage rating (20VDC or higher)
• Actuator type (Slide, Standard)
• Mounting configuration (Through Hole, Right Angle)
• Pitch spacing (0.100" / 2.54mm)
• Termination style (PC Pin)

Mechanical Compatibility Parameters:

• Height above board tolerance
• Overall length dimensions
• Contact material and finish specifications
• Body material compatibility

Compliance and Availability:

• Product status (Active preferred for new designs)
• RoHS compliance status
• Moisture sensitivity level
• Mechanical and electrical life ratings

Parameter Comparison

Engineering Selection Recommendations

SPA08AB (Direct Substitute - Recommended for Primary Selection)

The SPA08AB is the direct equivalent from C&K and represents the active production replacement for the obsolete SP08A. This part maintains identical electrical specifications (SPST, 8-position, 10mA, 20VDC) and mechanical compatibility (slide actuator, through-hole right-angle mounting, 0.100" pitch, PC pin termination). The SPA08AB features ROHS3 compliance, addressing regulatory requirements for new designs. Minor dimensional variations exist: the SPA08AB length is 0.942" versus the SP08A at 0.898", and body material differs (PPS versus PBT), but these do not affect functional compatibility in standard DIP switch applications. Operating temperature range is narrower (-30°C to 60°C versus -20°C to 85°C), requiring verification for applications requiring extended temperature operation.

1977105-4 (Similar Substitute - Conditional Selection)

The 1977105-4 from TE Connectivity ALCOSWITCH Switches provides functional equivalence with notable electrical parameter differences. This part maintains SPST configuration, 8-position count, 10mA current rating, and identical mechanical mounting characteristics. However, the voltage rating is 5VDC, which is lower than the SP08A specification of 20VDC. This part is suitable only for applications operating at 5VDC or lower. The 1977105-4 offers superior operating temperature range (-30°C to 85°C) and uses copper alloy contacts with gold finish. Height above board is 0.244" compared to 0.169" for the SP08A, requiring PCB layout verification for space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the SPA08AB directly replace the SP08A without PCB modifications?

A: The SPA08AB maintains electrical and functional compatibility with the SP08A. Mechanical dimensions are similar but not identical. Length increases from 0.898" to 0.942", and height remains at 0.169". Verify PCB layout clearances and mounting hole alignment before implementation. No circuit modifications are required.

Q: What is the voltage rating limitation for the 1977105-4?

A: The 1977105-4 is rated for 5VDC maximum, compared to the SP08A at 20VDC. This part is suitable only for low-voltage applications operating at 5VDC or below. Do not use in circuits exceeding 5VDC.

Q: Are there RoHS compliance differences between these parts?

A: The SP08A is RoHS non-compliant. The SPA08AB is ROHS3 compliant, meeting current regulatory requirements. The 1977105-4 status is not applicable. For new designs subject to RoHS requirements, the SPA08AB is the appropriate selection.

Q: How do operating temperature ranges affect part selection?

A: The SP08A operates from -20°C to 85°C. The SPA08AB range is -30°C to 60°C, narrower at the upper limit. The 1977105-4 operates -30°C to 85°C, matching the SP08A upper limit. Verify application temperature requirements before selection.

Q: What packaging differences exist between substitute parts?

A: The SP08A packaging is listed as standard. The SPA08AB is supplied in tube packaging. The 1977105-4 packaging is not specified. Confirm packaging requirements for procurement and assembly processes.

Q: Are contact material differences significant for substitution?

A: The SP08A and SPA08AB both use beryllium copper contacts with gold finish. The 1977105-4 uses copper alloy contacts with gold finish. For applications requiring specific contact material properties, verify material compatibility with circuit requirements.