BPA05SK Equivalent & Substitute Parts

Part Overview

The BPA05SK is a DIP switch manufactured by C&K, featuring a 5-position SPST configuration with piano actuator, rated for 100mA at 5VDC. This component is classified as obsolete, making equivalent or substitute parts necessary for ongoing production, maintenance, or redesign applications. The BPA05SK is designed for surface mount, right-angle installation with gull wing termination and operates across -20°C to 85°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	BPA05SK
Manufacturer	C&K
Series	BPA
Circuit Configuration	SPST
Number of Positions	5
Current Rating	100mA
Voltage Rating	5VDC
Actuator Type	Piano, Raised
Mounting Type	Surface Mount, Right Angle
Termination Style	Gull Wing
Pitch	0.100" (2.54mm)
Height Above Board	0.274" (6.95mm)
Operating Temperature Range	-20°C to 85°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BPA05SK is determined by the following critical parameters:

Primary Compatibility Criteria:

Circuit configuration (SPST)
Number of positions (5)
Mounting type (Surface Mount, Right Angle)
Termination style (Gull Wing)
Pitch (0.100" / 2.54mm)
Actuator type (Piano)

Secondary Compatibility Criteria:

Current rating (100mA minimum)
Voltage rating (5VDC minimum)
Height above board (within mechanical envelope constraints)
Operating temperature range (must encompass -20°C to 85°C)

Identified Substitutes:

Group 1 - Direct Equivalent (Same Manufacturer): BPA05SB meets all primary and secondary compatibility criteria. This part maintains identical mechanical and electrical specifications while offering improved contact material (Beryllium Copper with Gold finish) and active product status with RoHS3 compliance.

Group 2 - Functional Equivalent (Different Manufacturer): 193-5MS (CTS Electrocomponents) meets primary compatibility criteria but operates at different electrical ratings (50mA at 24VDC versus 100mA at 5VDC). This part is suitable only for applications where the lower current rating and higher voltage rating are acceptable within the circuit design.

Parameter Comparison

Parameter	BPA05SK	BPA05SB	193-5MS
Manufacturer	C&K	C&K	CTS Electrocomponents
Circuit Configuration	SPST	SPST	SPST
Number of Positions	5	5	5
Current Rating (Amps)	100mA	100mA	50mA
Voltage Rating	5VDC	5VDC	24VDC
Actuator Type	Piano, Raised	Piano, Raised	Piano, Raised
Mounting Type	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle
Termination Style	Gull Wing	Gull Wing	Gull Wing
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Height Above Board	0.274" (6.95mm)	0.274" (6.95mm)	0.359" (9.12mm)
Operating Temperature Range	-20°C to 85°C	-20°C to 85°C	-40°C to 85°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant
Electrical Life	1,000 Cycles	1,000 Cycles	7,000 Cycles

Engineering Selection Recommendations

BPA05SB (Recommended Primary Substitute): BPA05SB is the direct equivalent for BPA05SK replacement. Both parts share identical electrical ratings (100mA at 5VDC), mechanical dimensions, and form factor. BPA05SB offers superior contact material (Beryllium Copper with Gold finish versus Phosphor Bronze with Tin), active product status, and RoHS3 compliance. This part is suitable for direct substitution in all applications where the BPA05SK was originally specified.

193-5MS (Conditional Substitute): 193-5MS is suitable only for applications where circuit design permits operation at 50mA and 24VDC. The increased height above board (0.359" versus 0.274") requires mechanical clearance verification. The extended electrical life (7,000 cycles) and wider operating temperature range (-40°C to 85°C) may provide advantages in specific environmental conditions. RoHS3 compliance and active product status are available with this option.

Frequently Asked Questions (FAQ)

Q: Can BPA05SB be used as a direct replacement for BPA05SK? A: Yes. BPA05SB maintains identical electrical ratings (100mA at 5VDC), mechanical dimensions, pitch, and mounting configuration. The parts are mechanically and electrically interchangeable.

Q: What are the key differences between BPA05SK and BPA05SB? A: Contact material differs (Phosphor Bronze with Tin finish on BPA05SK versus Beryllium Copper with Gold finish on BPA05SB). BPA05SB is active product status with RoHS3 compliance, while BPA05SK is obsolete and RoHS non-compliant.

Q: Is 193-5MS a suitable replacement for BPA05SK? A: 193-5MS is functionally compatible in mechanical configuration but operates at different electrical ratings (50mA at 24VDC). Substitution requires circuit design verification to confirm the lower current rating and higher voltage rating are acceptable.

Q: What is the impact of the height difference between BPA05SK and 193-5MS? A: 193-5MS has a height above board of 0.359" compared to 0.274" for BPA05SK. This 0.085" difference requires verification of available mechanical clearance in the PCB assembly.

Q: Are there packaging differences between the substitute parts? A: BPA05SK packaging is not specified. BPA05SB and 193-5MS are supplied in Tube packaging.

Q: What compliance certifications apply to each part? A: BPA05SK is RoHS non-compliant. Both BPA05SB and 193-5MS are RoHS3 compliant. All three parts are REACH Unaffected and classified as EAR99.

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