BP04KT DIP Switch SPST 4-Position Equivalent & Substitute Parts

Part Overview

The BP04KT is a 4-position DIP switch manufactured by C&K, featuring SPST (Single Pole Single Throw) circuit configuration with 100mA at 5VDC rating. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BP04KT utilizes a slide actuator with through-hole, right-angle mounting and PC pin termination suitable for standard PCB applications.

Substiute Parts

BP04KT

C&KIn Stock: 861BP04KT Datasheet

Current PartRFQ

BPA04B

C&KIn Stock: 23588BPA04B Datasheet

DirectRFQ

194-4MST

CTS ElectrocomponentsIn Stock: 3497194-4MST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BP04KT is determined by the following critical parameters:

• Circuit Configuration: Must be SPST
• Number of Positions: Must be 4
• Mounting Type: Must be Through Hole, Right Angle
• Pitch: Must be 0.100" (2.54mm)
• Termination Style: Must be PC Pin
• Contact Finish: Must be Gold

The substitute parts listed below maintain these core electrical and mechanical parameters. Variations in actuator type (slide versus piano), contact material, body material, and operating temperature range are permissible within the scope of functional equivalence, provided that the application voltage and current requirements do not exceed the substitute part's ratings.

Parameter Comparison

Engineering Selection Recommendations

BPA04B (C&K): This substitute maintains identical electrical specifications (100mA, 5VDC) and mechanical compatibility with the BP04KT. The BPA04B is classified as active product status with ROHS3 compliance and an extended operating temperature range (-20°C to 85°C). The primary difference is the piano actuator type versus the slide actuator of the BP04KT. The BPA04B is suitable for applications where the BP04KT is no longer available and where actuator preference does not impose design constraints.

194-4MST (CTS Electrocomponents): This substitute maintains mechanical compatibility (4-position, through-hole right-angle, 0.100" pitch, PC pin termination) but operates at reduced current (50mA) and elevated voltage (24VDC) compared to the BP04KT. The 194-4MST is classified as active product status with ROHS3 compliance and an extended operating temperature range (-40°C to 85°C). Selection of the 194-4MST requires verification that the application circuit operates at 24VDC and does not exceed 50mA per switch position.

Frequently Asked Questions (FAQ)

Q: Can the BPA04B directly replace the BP04KT in existing designs?

A: The BPA04B maintains identical electrical ratings (100mA, 5VDC) and mechanical footprint (0.100" pitch, through-hole right-angle, PC pin termination). The actuator type differs (piano versus slide), which may affect user interface feel but does not impact electrical function. PCB layout compatibility is maintained.

Q: Under what conditions is the 194-4MST suitable as a substitute?

A: The 194-4MST is suitable only for applications operating at 24VDC with maximum current draw not exceeding 50mA per switch position. The mechanical footprint is compatible with BP04KT PCB layouts. Applications designed for 5VDC operation cannot use the 194-4MST without circuit redesign.

Q: What are the key differences between slide and piano actuators?

A: Slide actuators (BP04KT) and piano actuators (BPA04B, 194-4MST) differ in actuation mechanism and user interface. Both are functionally equivalent for electrical switching purposes. Piano actuators typically provide tactile feedback and are common in modern DIP switch designs. Slide actuators are characteristic of legacy designs.

Q: Are all substitute parts RoHS compliant?

A: The BP04KT is RoHS Compliant. Both substitute parts (BPA04B and 194-4MST) are ROHS3 Compliant, meeting current regulatory requirements. All parts are REACH Unaffected with MSL rating of 1 (Unlimited).

Q: What is the impact of different operating temperature ranges?

A: The BP04KT operates from -20°C to 60°C. The BPA04B extends this to -20°C to 85°C, and the 194-4MST to -40°C to 85°C. Selection should be based on the application's thermal environment. Extended temperature range does not affect electrical performance within the BP04KT's original operating window.