MM74HCT240SJ

Buffers, Drivers, Receivers, Transceivers Overview

The MM74HCT240SJ is an inverting octal 3-state buffer manufactured by Fairchild Semiconductor. It operates on a single supply voltage of 4.5V to 5.5V and features TTL-compatible inputs with a fanout of 15 LS-TTL equivalent inputs. The device provides high drive current outputs, typically 6mA minimum, enabling high-speed operation even when driving large bus capacitances. It utilizes advanced silicon-gate CMOS technology to achieve speeds comparable to low-power Schottky devices while maintaining low power consumption. The component is housed in a 20-SOP package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• TTL input compatibility for interfacing between TTL and NMOS components
• High output drive current capability for driving large bus capacitances
• Low quiescent current consumption characteristic of CMOS technology
• Three-state outputs suitable for direct connection to system buses

Buffers, Drivers, Receivers, Transceivers Applications

• Connecting memory and data registers to system buses
• Driving bus lines in digital communication systems
• Interface circuits between TTL and standard CMOS logic families
• General-purpose buffering for high-speed digital signals

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the manufacturer designation as Fairchild Semiconductor or its successor entity ON Semiconductor, as corporate acquisitions may affect part marking. Confirm the specific package variant corresponding to the SJ suffix against official datasheets. Ensure the component meets RoHS compliance requirements if applicable to the target assembly process. Cross-reference the DigiKey part number 2156-MM74HCT240SJ-ND for accurate sourcing details.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing circuits requiring octal buffering with three-state control capabilities. It is suitable for applications needing high drive strength and fast propagation delays comparable to low-power Schottky logic. Consider this part for designs transitioning from legacy TTL systems to CMOS architectures where power efficiency is critical. Ensure the operating voltage range aligns with the 4.5V to 5.5V specification.

Buffers, Drivers, Receivers, Transceivers Part Context

This component belongs to the 74HCT series of logic integrated circuits, which are designed for high-speed CMOS operation with TTL-compatible input levels. The MM74HCT240 specifically functions as an inverting buffer, providing signal inversion and amplification. It is part of a broader family of logic devices intended to replace older low-power Schottky TTL parts while offering improved power consumption characteristics.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The MM74HCT240MTC is a documented alternative from Fairchild Semiconductor featuring identical functional descriptions. Verify pinout compatibility and package dimensions before substitution. Check for any differences in propagation delay specifications or output drive currents between the SJ and MTC variants.