CTS 210-4LPSTFD DIP Switch Equivalent & Substitute Parts

Part Overview

The CTS 210-4LPSTFD is a 4-position DIP switch with SPST circuit configuration, rated for 100mA at 20VDC. This through-hole component features a slide actuator with flush, recessed positioning and gold-plated beryllium copper contacts. The part is actively manufactured and ROHS3 compliant, making it suitable for applications requiring reliable switching in compact form factors. Equivalent parts may be required due to inventory availability, lead time considerations, or specific actuator level preferences in system design.

Key Parameters

Parameter	Value
Circuit Configuration	SPST
Number of Positions	4
Current Rating	100mA
Voltage Rating	20VDC (Main Part)
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Contact Material	Beryllium Copper, Gold Finish
Operating Temperature Range	-40°C to 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The CTS 210-4LPSTFD can be substituted with C&K SD04H0B and SD04H1B based on the following allowed parameters:

Core Compatibility Parameters:

SPST circuit configuration maintained across all parts
4-position DIP switch format consistent
100mA current rating identical
Through-hole mounting with 0.100" pitch preserved
Beryllium copper contacts with gold finish maintained
Operating temperature range -40°C to 85°C consistent
ROHS3 compliance and REACH unaffected status aligned

Voltage Rating Consideration: The substitute parts (SD04H0B and SD04H1B) are rated for 25VDC, which exceeds the main part's 20VDC specification. This higher voltage rating provides design margin and does not restrict substitution in applications operating at or below 20VDC.

Actuator Level Differentiation:

CTS 210-4LPSTFD: Flush, Recessed actuator level
C&K SD04H0B: Flush, Recessed actuator level
C&K SD04H1B: Raised actuator level

Parameter Comparison

Parameter	CTS 210-4LPSTFD	C&K SD04H0B	C&K SD04H1B
Manufacturer	CTS Electrocomponents	C&K	C&K
Circuit	SPST	SPST	SPST
Positions	4	4	4
Current Rating	100mA	100mA	100mA
Voltage Rating	20VDC	25VDC	25VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Flush, Recessed	Flush, Recessed	Raised
Height Above Board	0.180" (4.57mm)	0.178" (4.52mm)	0.178" (4.52mm)
Contact Material	Beryllium Copper	Beryllium Copper	Beryllium Copper
Contact Finish	Gold	Gold	Gold
Mounting Type	Through Hole	Through Hole	Through Hole
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Electrical Life	1,000 Cycles	2,000 Cycles	2,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance with REACH unaffected designation, ensuring regulatory alignment for current applications.

CTS 210-4LPSTFD Selection: Use when flush, recessed actuator level is required and 20VDC rating is the design specification. This part provides the baseline electrical performance for the application.

C&K SD04H0B Selection: Use as a direct substitute when actuator level (flush, recessed) must match the CTS part. The 25VDC rating provides additional design margin. Electrical life rating of 2,000 cycles exceeds the main part specification.

C&K SD04H1B Selection: Use when a raised actuator level is acceptable or preferred for accessibility in the application. The 25VDC rating and 2,000-cycle electrical life provide enhanced performance characteristics. Height above board remains within 0.002" of the CTS part.

Frequently Asked Questions (FAQ)

Q: Can SD04H0B and SD04H1B be used interchangeably with the CTS 210-4LPSTFD?

A: SD04H0B is a direct substitute with identical actuator level (flush, recessed). SD04H1B differs only in actuator level (raised), which may affect user interface ergonomics and PCB clearance. Both maintain electrical compatibility at 20VDC operation.

Q: What is the significance of the 25VDC rating on the C&K parts?

A: The higher voltage rating does not restrict substitution in 20VDC applications. It indicates the maximum voltage the switch can safely handle, providing design margin and allowing use in systems with higher voltage specifications.

Q: How do the electrical life ratings differ?

A: The CTS 210-4LPSTFD is rated for 1,000 electrical cycles, while both C&K substitutes are rated for 2,000 cycles. This indicates the C&K parts have extended operational life under switching conditions.

Q: Are there PCB layout considerations when substituting these parts?

A: Height above board differs by 0.002" (0.05mm) between the CTS part and C&K substitutes. Pitch and mounting footprint remain identical at 0.100" (2.54mm). Actuator level differences (flush/recessed vs. raised) may require panel cutout adjustments.

Q: Do all parts share the same packaging format?

A: Yes, all three parts are supplied in tube packaging with identical pitch and through-hole termination style, ensuring compatibility with standard pick-and-place assembly processes.

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