SN74LS240NE4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS240NE4 is an octal buffer and line driver from the Texas Instruments LS logic series, housed in a 20-pin PDIP package. It features two independent 4-bit channels with inverted outputs and active-low output-enable inputs (G). The device provides three-state outputs for direct bus driving and includes PNP inputs to reduce DC loading. It operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0 °C to 70 °C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Three-state outputs enable direct connection to bus lines or memory address registers while allowing high-impedance isolation.
• PNP input structure reduces DC loading on bus lines compared to standard TTL inputs.
• Built-in hysteresis at the inputs improves noise margins for reliable signal transmission.
• Inputs are tolerant down to 2 V, providing compatibility with 3.3-V or 2.5-V logic systems.

Buffers, Drivers, Receivers, Transceivers Applications

• Servers
• LED Displays
• Network Switches
• Telecom Infrastructure
• Motor Drivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the component matches the specific SN74LS240NE4 designation, as the 'NE4' suffix indicates lead-free packaging compliant with RoHS standards. Confirm the manufacturer is Texas Instruments or an authorized distributor like Rochester Electronics. Ensure the PDIP-20 package type aligns with your board design requirements before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring octal buffering with inverted logic and three-state control. It is suitable for applications needing compatibility with lower voltage logic inputs due to its 2 V tolerance. Consider the PDIP-20 package if through-hole mounting is required for prototyping or specific mechanical constraints.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SNx4LS24x family of octal buffers and line drivers. It shares functional similarities with the SN74LS241 (non-inverting) and SN74LS244 (non-inverting), differing primarily in output polarity. The LS series utilizes Schottky transistor logic technology to achieve improved speed and power dissipation characteristics compared to standard TTL families.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers include SN74LS240N and SN74LS240NSR. These variants share identical logical functionality but differ in package style, such as SOIC or SSOP, rather than PDIP.