SN74ALS240A-1DBRG4

Overview

The SN74ALS240A-1DBRG4 is an octal buffer and line driver featuring three-state outputs, manufactured by Texas Instruments. It belongs to the ALS logic series and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides inverting functionality across eight independent channels. It is housed in a 20-pin SSOP package designed for surface-mount applications. Key electrical characteristics include a high-level output current of -15 mA and a low-level output current of 24 mA. The component supports a maximum operating temperature of +70 °C.

Feature Summary

• Octal configuration with three-state outputs for bus-oriented communication
• Inverting logic function compatible with standard TTL levels
• Surface-mount SSOP packaging for compact circuit board integration

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented architectures

Procurement Notes

Verify the specific suffix '1' indicates the dual four-bit configuration variant rather than the standard single eight-bit layout. Confirm the SSOP-20 package type matches the design footprint requirements. Ensure the commercial temperature grade (+70 °C) aligns with the operational environment specifications before finalizing procurement orders.

Selection Notes

Select this component when an octal inverting buffer with three-state capability is required for bus systems. The ALS series offers faster switching speeds compared to standard LS logic while maintaining lower power consumption. Verify that the 4.5 V to 5.5 V supply voltage range suits the system power rails and that the SSOP-20 package fits the available PCB space constraints.

Part Context

This part is a member of the Texas Instruments 74ALS logic family, which utilizes advanced Schottky technology. The SN74ALS240A series generally includes variants such as the SN74ALS240ADWR and SN74ALS240A-1N. The '-1' designation typically distinguishes internal pinout or functional grouping variations within the broader octal driver product line.

Replacement Considerations

Direct substitutes include the SN74ALS240ADWR and SN74ALS240A-1N. Cross-reference the specific '-1' suffix requirements to ensure functional equivalence regarding channel grouping and pinout compatibility before substitution.