74HCT240BQ,115

Overview

The Nexperia 74HCT240BQ,115 is an octal buffer and line driver featuring inverting 3-state outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and accepts TTL input levels. The device provides two independent output enable controls (1OE and 2OE), each managing four outputs. Packaged in a DHVQFN20 format with dimensions of 2.5 mm by 4.5 mm, it supports ambient temperatures from -40 °C to +125 °C.

Feature Summary

• Inverts logic signals while providing high-impedance OFF-states via dual output enables
• Accepts TTL-compatible input voltage levels for direct interfacing
• Includes input clamp diodes to support current limiting resistors for over-voltage interfaces

Applications

• Memory address buffering
• Clock distribution circuits
• Bus-oriented transmissions

Procurement Notes

Verify the specific ordering suffix matches the required package variant. Confirm that the intended operating environment aligns with the specified temperature range limits. Ensure power dissipation requirements are met relative to the thermal characteristics of the DHVQFN20 package during system integration.

Selection Notes

Select this component when inverting functionality is required alongside bus isolation capabilities. The HCT logic family ensures compatibility with standard TTL inputs. Verify that the 3-state control signals meet the timing requirements for the specific application bandwidth.

Part Context

This part belongs to the 74HCT series of CMOS logic devices manufactured by Nexperia. It shares functional similarities with non-inverting variants like the 74HCT244 but includes signal inversion. The BQ suffix designates the leadless DHVQFN20 package type optimized for surface-mount assembly.

Replacement Considerations

Public confirmed substitute: SN74ACT240RKSR.