HEF40244BT,653

Overview

The HEF40244BT,653 is an octal buffer and line driver featuring three-state outputs manufactured by Nexperia. It operates within a supply voltage range of 3.0 V to 15.0 V and supports ambient temperatures from -40 °C to +85 °C. The device integrates two independent four-bit buffers controlled by separate active-low output enable inputs (EOA and EOB). Inputs include clamp diodes for interfacing with voltages exceeding VCC. It complies with JEDEC standard JESD 13-B and offers high noise immunity.

Feature Summary

• Features two independent four-bit buffers with dedicated active-low output enables for flexible configuration as one eight-bit or two four-bit units.
• Provides three-state outputs that assume a high-impedance OFF-state when the respective enable input is HIGH.
• Includes input clamp diodes allowing interface to voltages in excess of VCC using current limiting resistors.
• Complies with JEDEC standard JESD 13-B and includes electrostatic discharge protection.

Applications

• Line driving applications requiring signal buffering
• Bus-oriented transmissions utilizing three-state control
• Memory address decoding systems

Procurement Notes

Verify the specific ordering suffix

Selection Notes

Select this component when designing circuits requiring octal buffering with tri-state capability. Ensure the application voltage remains within the 3.0 V to 15.0 V range. Consider the package thermal characteristics if operating near the upper temperature limit. Verify that the load capacitance requirements align with the dynamic propagation delay specifications provided in the datasheet.

Part Context

This part belongs to the HEF4024B logic family, which consists of CMOS octal buffers. It is designed for general-purpose digital logic applications where high noise immunity and low power dissipation are required. The device utilizes standard SO20 packaging suitable for surface-mount assembly on printed circuit boards.

Replacement Considerations

Check for compatible parts within the same logic family offering identical pinouts and electrical characteristics. Ensure any substitute maintains the three-state functionality and voltage compatibility.