BP04YT DIP Switch SPST 4-Position Equivalent & Substitute Parts

Part Overview

The BP04YT is a DIP switch manufactured by C&K, featuring a 4-position SPST configuration with slide actuator, rated for 100mA at 5VDC. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The BP04YT serves applications requiring low-voltage switching with standard slide actuation in compact through-hole packages. Due to its obsolete status, active alternatives with compatible electrical and mechanical specifications are available.

Key Parameters

Parameter	Value
Circuit Configuration	SPST
Number of Positions	4
Current Rating	100mA
Voltage Rating	5VDC
Mounting Type	Through Hole, Right Angle
Pitch	0.100" (2.54mm)
Termination Style	PC Pin
Operating Temperature Range	-20°C ~ 60°C
Mechanical Life	1,000 Cycles
Electrical Life	1,000 Cycles
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution for the BP04YT is determined by the following critical parameters:

Circuit Configuration: SPST topology must be maintained
Position Count: 4-position requirement
Mounting and Pitch: Through-hole, right-angle mounting with 0.100" (2.54mm) pitch
Electrical Ratings: Current and voltage handling capability
Termination: PC pin termination for PCB compatibility

The substitute parts listed below maintain these core electrical and mechanical specifications while offering active product status and improved compliance certifications.

Parameter Comparison

Parameter	BP04YT (Main)	BPA04B (C&K)	195-4MST (CTS)
Manufacturer	C&K	C&K	CTS Electrocomponents
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating	100mA	100mA	50mA
Voltage Rating	5VDC	5VDC	24VDC
Actuator Type	Slide (Standard)	Piano	Piano
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Termination Style	PC Pin	PC Pin	PC Pin
Operating Temperature	-20°C ~ 60°C	-20°C ~ 85°C	-40°C ~ 85°C
Mechanical Life	1,000 Cycles	1,000 Cycles	Not Specified
Electrical Life	1,000 Cycles	1,000 Cycles	2,000 Cycles
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BPA04B (C&K) is the primary substitute for BP04YT applications. Both components are manufactured by C&K, share identical electrical ratings (100mA, 5VDC), and maintain the same 4-position SPST configuration with compatible through-hole mounting. The BPA04B offers active product status, extended operating temperature range (-20°C ~ 85°C), and ROHS3 compliance. The actuator type differs (piano versus slide), which affects mechanical interface but not electrical function. The BPA04B is suitable for direct replacement in designs where actuator style is not a critical constraint.

195-4MST (CTS Electrocomponents) is a secondary alternative for applications where voltage flexibility is required. This part operates at 24VDC with reduced current rating (50mA) and extended temperature range (-40°C ~ 85°C). The 195-4MST is appropriate only for circuits designed for 24VDC operation and where the 50mA current limit is sufficient. This part is not suitable as a direct replacement in 5VDC circuits.

Both substitute parts maintain REACH compliance and MSL 1 rating, ensuring compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can BPA04B replace BP04YT in a 5VDC circuit? A: Yes. The BPA04B is rated for 5VDC at 100mA, matching the BP04YT electrical specifications. Both components share identical pitch (0.100"), termination style (PC pin), and through-hole right-angle mounting. The primary difference is actuator type (piano versus slide), which does not affect electrical compatibility.

Q: Is 195-4MST compatible with BP04YT applications? A: No, not for direct replacement. The 195-4MST is rated for 24VDC operation, while BP04YT is specified for 5VDC. Additionally, the 195-4MST current rating is 50mA, lower than the BP04YT 100mA rating. This part is suitable only for 24VDC circuits where current requirements do not exceed 50mA.

Q: What is the difference between slide and piano actuators? A: Slide actuators (BP04YT) use a linear sliding mechanism, while piano actuators (BPA04B, 195-4MST) use a rocker-style mechanism. Both actuator types control the same SPST switching function. Selection depends on mechanical interface requirements and user preference for actuation style.

Q: Are all substitute parts RoHS compliant? A: Yes. BP04YT is RoHS Compliant, while BPA04B and 195-4MST are ROHS3 Compliant. All three parts meet current RoHS requirements and are suitable for applications requiring RoHS certification.

Q: What is the packaging difference between substitute parts? A: BPA04B and 195-4MST are supplied in tube packaging. Packaging does not affect electrical or mechanical performance and is determined by procurement and assembly requirements.

Q: Can BP04YT be used in applications requiring extended temperature range? A: No. BP04YT operates within -20°C ~ 60°C. For applications requiring extended temperature operation, BPA04B (-20°C ~ 85°C) or 195-4MST (-40°C ~ 85°C) are appropriate alternatives, provided voltage and current ratings match circuit requirements.

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