NDI08S DIP Switch Equivalent & Substitute Parts

Part Overview

The NDI08S is an 8-position DIP switch manufactured by APEM Inc., designed for through-hole PCB mounting applications. This SPST (Single Pole Single Throw) switch operates at 24VDC with a 25mA current rating and features a slide actuator with gold-plated copper alloy contacts. The part is currently active in production and RoHS3 compliant, making it suitable for modern electronic assemblies requiring reliable switching functionality in compact form factors.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and environmental ratings can be maintained across different manufacturers while preserving circuit functionality and PCB integration requirements.

Key Parameters

Parameter	Specification
Circuit Configuration	SPST (Single Pole Single Throw)
Number of Positions	8
Voltage Rating	24VDC
Current Rating	25mA
Actuator Type	Slide (Standard), Raised Level
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Termination Style	PC Pin
Mechanical Life	2,000 Cycles
Electrical Life	2,000 Cycles
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

The JS0108AP4-S manufactured by NKK Switches qualifies as a direct substitute for the NDI08S based on the following critical parameters:

Circuit Configuration: Both parts are SPST with 8 positions
Electrical Ratings: Identical voltage (24VDC) and current (25mA) specifications
Mechanical Interface: Matching pitch (0.100"/2.54mm), through-hole mounting, and PC pin termination
Actuator Design: Both feature slide-type actuators with raised actuator levels
Lifecycle Ratings: Equivalent mechanical and electrical life cycles (2,000 cycles each)
Compliance: Both are RoHS3 compliant with MSL 1 rating

Substitution is valid where PCB layout accommodates the dimensional differences noted in the parameter comparison table and operating temperature ranges align with application requirements.

Parameter Comparison

Parameter	NDI08S (APEM Inc.)	JS0108AP4-S (NKK Switches)
Circuit	SPST	SPST
Number of Positions	8	8
Voltage Rating	24VDC	24VDC
Current Rating	25mA	25mA
Actuator Type	Slide (Standard)	Slide (Standard)
Actuator Level	Raised	Raised
Height Above Board	0.197" (5.00mm)	0.162" (4.11mm)
Length	0.837" (21.26mm)	0.837" (21.26mm)
Pitch	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin
Contact Material	Copper Alloy	Beryllium Copper
Contact Finish	Gold	Gold
Mechanical Life	2,000 Cycles	2,000 Cycles
Electrical Life	2,000 Cycles	2,000 Cycles
Operating Temperature	-20°C ~ 85°C	-25°C ~ 70°C
Body Material	PBT, Glass Filled	PA (Nylon), Glass Filled
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both the NDI08S and JS0108AP4-S are active production parts with full RoHS3 compliance and unlimited moisture sensitivity ratings, making either suitable for modern electronic assemblies.

Selection Considerations Based on Provided Data:

The NDI08S offers a wider operating temperature range (-20°C to 85°C) compared to the JS0108AP4-S (-25°C to 70°C). Applications requiring sustained operation above 70°C should specify the NDI08S.

The JS0108AP4-S features a lower profile (0.162" vs. 0.197" height above board), which may be advantageous in space-constrained PCB layouts where vertical clearance is limited.

Contact material differs between parts: NDI08S uses copper alloy while JS0108AP4-S uses beryllium copper. Both are gold-plated and rated for identical electrical performance at 24VDC/25mA.

Both parts share identical pitch (0.100"), length (0.837"), and termination style (PC pin), ensuring direct PCB footprint compatibility when height clearance is verified.

Frequently Asked Questions (FAQ)

Q: Can the JS0108AP4-S directly replace the NDI08S on existing PCBs?

A: Yes, provided the PCB layout accommodates the height difference. The NDI08S is 0.197" above board while the JS0108AP4-S is 0.162" above board. All other mechanical parameters (pitch, length, termination) are identical.

Q: What are the key electrical differences between these parts?

A: There are no electrical differences. Both parts are rated for 24VDC operation at 25mA with SPST 8-position configuration and identical mechanical/electrical life cycles (2,000 cycles).

Q: Are there temperature range limitations I should consider?

A: The NDI08S operates from -20°C to 85°C, while the JS0108AP4-S operates from -25°C to 70°C. For applications exceeding 70°C continuous operation, the NDI08S is the appropriate selection.

Q: Do both parts meet current compliance requirements?

A: Yes. Both the NDI08S and JS0108AP4-S are RoHS3 compliant with MSL 1 (unlimited) ratings, suitable for standard PCB assembly and storage conditions.

Q: What is the difference in contact material, and does it affect performance?

A: The NDI08S uses copper alloy contacts while the JS0108AP4-S uses beryllium copper. Both are gold-plated and rated for identical electrical performance at the specified voltage and current levels. Contact material selection does not affect switching performance in this application.

Q: Are the packaging formats compatible?

A: Both parts are supplied in tube packaging. Inventory availability may differ between manufacturers, but packaging format does not affect PCB integration.

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