4028BDC

Overview

The CD4028BDC is a BCD-to-Decimal Decoder/Driver manufactured by National Semiconductor. It converts four-bit Binary-Coded Decimal inputs into ten active-high decimal outputs. The device operates within a supply voltage range of 3V to 18V and supports dual supply configurations. It features output current capabilities of 6.8mA for both high and low states. The component is housed in a 16-CDIP package with through-hole mounting and functions reliably across an operating temperature range of -55°C to 125°C.

Feature Summary

• Performs binary-coded decimal to decimal decoding
• Provides ten active-high decoded outputs
• Supports wide supply voltage operation

Applications

• Digital display systems requiring decimal decoding
• Control logic circuits utilizing BCD inputs
• Industrial instrumentation with wide temperature requirements

Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are managed by Texas Instruments. Confirm the specific suffix 'DC' corresponds to the 16-CDIP package and commercial/industrial temperature grade. Ensure compatibility with existing PCB footprints for through-hole mounting. Check for updated datasheets reflecting current TI specifications.

Selection Notes

Select this component when a dedicated BCD-to-decimal conversion is required with active-high outputs. It is suitable for applications needing robust performance across extreme temperatures. Consider pin compatibility if replacing older CMOS logic families. Verify that the 6.8mA drive current meets the load requirements of the connected indicators or subsequent logic stages.

Part Context

This part belongs to the standard 4000-series CMOS logic family, widely used in digital electronics for basic arithmetic and control functions. National Semiconductor was acquired by Texas Instruments, which now produces and supports this line. The 4028 series specifically addresses the need for direct decimal decoding from BCD sources without additional external gating.

Replacement Considerations

Equivalent parts include the MC14028B from ON Semiconductor and the HEF4028B from NXP. These devices share identical logical functionality and pinouts. Verify package dimensions and electrical characteristics against the original specification before substitution.