BDB03 Equivalent & Substitute Parts

Part Overview

The BDB03 is a DIP switch manufactured by C&K, featuring a SPST (Single Pole Single Throw) configuration with 3 positions and a standard vertical slide actuator. This component is rated for 25mA at 25VDC and is designed for through-hole mounting on printed circuit boards. The BDB03 is classified as obsolete, making identification of suitable substitute components essential for ongoing design support, legacy system maintenance, and production continuity.

Substiute Parts

BDB03

C&KIn Stock: 923BDB03 Datasheet

Current PartRFQ

BD03

C&KIn Stock: 10507BD03 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The BD03 qualifies as a functional substitute for the BDB03 based on the following critical parameters:

Matching Parameters:

• Circuit configuration: Both are SPST
• Number of positions: Both feature 3 positions
• Actuator type: Both use slide (standard) actuators with raised actuator level
• Mounting type: Both are through-hole mounted
• Pitch: Both use 0.100" (2.54mm) full pitch
• Contact material and finish: Both use phosphor bronze with gold plating
• Operating temperature range: Both operate from -40°C to 85°C
• Mechanical and electrical life: Both rated for 10,000 cycles
• RoHS compliance: Both are ROHS3 compliant
• Termination style: Both use PC pins

Differing Parameters:

• Current rating: BD03 is rated for 100mA versus BDB03 at 25mA
• Voltage rating: BD03 is rated for 5VDC versus BDB03 at 25VDC
• Height above board: BD03 measures 0.297" (7.54mm) versus BDB03 at 0.274" (6.95mm)
• Body material: BD03 uses polybutylene terephthalate (PBT) glass-filled versus BDB03 using polyamide (PA46) nylon 4/6
• Product status: BD03 is active; BDB03 is obsolete

The BD03 operates at lower voltage and higher current ratings than the BDB03, with a slightly increased height above the board. These differences must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The BD03 is an active product from C&K and maintains ROHS3 compliance, making it suitable for new designs and legacy system updates. The primary consideration for substitution is the difference in electrical ratings: the BD03 operates at 5VDC with a 100mA current capacity, whereas the BDB03 operates at 25VDC with a 25mA current capacity.

For applications where the circuit operates at 5VDC and requires switching currents up to 100mA, the BD03 provides a direct functional replacement with identical mechanical and switching characteristics. The 0.023" (0.59mm) increase in height above the board must be verified against PCB layout constraints and enclosure clearances.

The BD03's active product status ensures ongoing availability and manufacturing support, eliminating supply chain risks associated with the obsolete BDB03.

Frequently Asked Questions (FAQ)

Q: Can the BD03 directly replace the BDB03 in existing designs?

A: Direct replacement depends on circuit voltage and current requirements. The BD03 is rated for 5VDC and 100mA, while the BDB03 is rated for 25VDC and 25mA. If your application operates at 5VDC with switching currents not exceeding 100mA, the BD03 is compatible. If your circuit requires 25VDC operation, the BD03 is not suitable.

Q: What is the impact of the height difference between these parts?

A: The BD03 is 0.023" (0.59mm) taller than the BDB03. This difference must be evaluated against available PCB clearance and enclosure height constraints. Verify that the increased height does not interfere with overlying components or mechanical assemblies.

Q: Are both parts RoHS compliant?

A: Yes, both the BDB03 and BD03 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.

Q: What packaging is available for the BD03?

A: The BD03 is supplied in tube packaging, which differs from the BDB03 packaging specification. Verify that tube packaging meets your procurement and assembly requirements.

Q: Why is the BDB03 obsolete?

A: The BDB03 has been discontinued by C&K. The BD03 represents the active product line continuation with enhanced electrical ratings and improved material specifications. For ongoing production and support, transition to the BD03 is recommended.