MC74AC240MEL

Overview

The MC74AC240MEL is an octal buffer and line driver manufactured by onsemi, belonging to the 74AC logic series. It features inverted outputs with three-state capability, allowing for effective bus-oriented applications. The device operates within a supply voltage range of 2V to 6V and supports through-hole mounting in a 20-SOIC (0.300 inch, 7.62mm) package. It provides high noise immunity and symmetrical output impedance, suitable for driving transmission lines.

Feature Summary

• Octal configuration providing eight independent inverted buffers or line drivers within a single integrated circuit.
• Three-state output design enabling direct connection to data buses without additional interface hardware.
• Wide operating voltage range supporting compatibility across various digital logic systems.
• High noise immunity characteristics ensuring reliable signal integrity in electrically noisy environments.

Applications

• Bus-oriented memory and I/O interfacing in embedded systems
• Driving capacitive or transmission line loads in communication circuits
• Clock distribution networks requiring buffered signals

Procurement Notes

Verify component authenticity and datasheet revision when sourcing this part. Confirm package dimensions match the 20-SOIC specification. Check RoHS compliance status as older batches may differ from current manufacturing standards. Ensure storage conditions adhere to moisture sensitivity level requirements to prevent damage during assembly.

Selection Notes

Select this component for designs requiring octal buffering with inversion and three-state control. Compare propagation delays and drive currents against system timing requirements. Consider thermal dissipation capabilities if operating at maximum load conditions. Evaluate pin compatibility with existing PCB footprints before finalizing the design.

Part Context

This component belongs to the 74AC family of high-speed CMOS logic devices. It serves as a standard solution for expanding digital outputs in microcontroller-based projects. Similar parts include non-inverting variants like the 74AC244. The device is widely used in industrial control and consumer electronics for signal conditioning.

Replacement Considerations

Public confirmed substitute part numbers: MC74AC240DWG, MC74AC240DTR2G.