BU4028B Equivalent & Substitute Parts

Part Overview

The BU4028B is a 1 x 4:10 decoder logic integrated circuit manufactured by Rohm Semiconductor in a 16-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The BU4028B operates with dual supply voltage (3V to 16V) and is suitable for applications requiring binary-to-decimal decoding functionality in through-hole mounting configurations.

Substiute Parts

BU4028B

Rohm SemiconductorIn Stock: 865BU4028B Datasheet

Current PartRFQ

CD4028BE

Texas InstrumentsIn Stock: 5097CD4028BE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BU4028B are identified based on the following critical parameters that determine functional compatibility:

• Decoder Circuit Configuration: 1 x 4:10 (binary-to-decimal decoding function)
• Package Type: 16-DIP (0.300", 7.62mm) for mechanical and pin compatibility
• Mounting Type: Through Hole
• Voltage Supply Range: Minimum 3V lower bound and minimum 16V upper bound to ensure operation within the original specification envelope
• Operating Temperature Range: Must support the original -40°C to 85°C range or broader
• Series Compatibility: 4000B logic family

The CD4028BE from Texas Instruments meets these substitution criteria while offering active product status and extended operational parameters.

Parameter Comparison

Engineering Selection Recommendations

The CD4028BE is the qualified substitute for the BU4028B based on the following engineering criteria:

• Functional Equivalence: Both devices implement identical 1 x 4:10 decoder logic within the 4000B series family
• Package Compatibility: Identical 16-DIP (0.300", 7.62mm) through-hole package ensures direct PCB compatibility without layout modifications
• Compliance Status: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements
• Active Product Status: The CD4028BE is actively manufactured by Texas Instruments, ensuring long-term availability and supply chain continuity compared to the obsolete BU4028B
• Extended Operating Range: The CD4028BE provides broader voltage supply range (3V to 18V) and extended temperature range (-55°C to 125°C), offering design flexibility for various application environments

Frequently Asked Questions (FAQ)

Q: Can the CD4028BE directly replace the BU4028B without PCB modifications?

A: Yes. Both devices use identical 16-DIP (0.300", 7.62mm) through-hole packaging with the same pin configuration. Direct socket substitution is possible without PCB layout changes.

Q: What is the difference between dual supply and single supply operation?

A: The BU4028B requires dual supply voltage sources, while the CD4028BE operates with single supply. The CD4028BE's single supply design simplifies power distribution in new designs. Both devices support the 3V to 16V overlap range, ensuring functional compatibility in existing dual-supply circuits.

Q: Are there output current differences between these parts?

A: Yes. The BU4028B provides 1.2mA output high and 3mA output low, while the CD4028BE provides 6.8mA for both high and low outputs. The CD4028BE's higher output current capability is compatible with the BU4028B's specifications and does not create substitution conflicts.

Q: Why is the BU4028B listed as obsolete?

A: The BU4028B is no longer manufactured by Rohm Semiconductor. The CD4028BE from Texas Instruments provides equivalent functionality and is actively produced, making it the appropriate choice for new designs and production continuity.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the BU4028B and CD4028BE are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.