CD4008AD3

Specialty Logic Overview

The CD4008AD3 is a 4-bit binary adder/subtractor belonging to the Harris Corporation 4000/14000/40000 CMOS logic series. It operates within a supply voltage range of 3 V to 12 V, with a nominal rating of 5 V. The device features a propagation delay of 1300 ns at the nominal supply voltage and supports a maximum load capacitance of 50 pF. Designed for robust performance, it functions across an extended temperature range from -55 °C to +125 °C. The component is housed in a 16-lead ceramic dual in-line package (CDIP16) utilizing a hermetically sealed metal-sealed cofired construction.

Specialty Logic Feature Summary

• Configurable as a 4-bit parallel adder or subtractor using external control signals
• Hermetically sealed ceramic construction ensuring reliability in harsh environments
• Capable of cascading for multi-bit arithmetic operations via dedicated carry inputs and outputs

Specialty Logic Applications

• Digital arithmetic processing units requiring reliable CMOS logic
• Industrial control systems operating under extreme temperature conditions
• Military and aerospace electronic assemblies demanding hermetic sealing

Specialty Logic Procurement Notes

Verify the specific suffix 'AD3' against official Harris datasheets to confirm the hermetic ceramic package variant. Ensure compliance with RoHS directives if required by the end application, as this series may not be certified. Confirm that the 1300 ns propagation delay meets system timing requirements at the intended operating voltage and temperature.

Specialty Logic Selection Notes

Select the CD4008AD3 when hermetic sealing is mandatory for environmental protection. Compare the 1300 ns propagation delay against faster plastic variants if speed is critical. Verify that the 3 V to 12 V supply range aligns with the system power architecture. Consider the 50 pF load capacitance limit when driving downstream logic stages.

Specialty Logic Part Context

This component is part of the extensive Harris 4000-series CMOS logic family, which provides standard digital functions. The CD4008 specifically addresses arithmetic needs within this ecosystem. Its ceramic packaging distinguishes it from commercial-grade plastic counterparts, targeting high-reliability sectors such as defense and space where long-term stability and radiation hardness are prioritized over cost.

Specialty Logic Replacement Considerations

Substitute only with verified equivalents explicitly listed in Harris documentation. Cross-reference pinouts and electrical characteristics carefully.