SN74ALS245A-1DWR

Overview

The SN74ALS245A-1DWR is an octal bus transceiver from the Texas Instruments SN74ALS series, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a temperature range of 0°C to +70°C. The device features non-inverting logic with tri-state outputs, providing a low-level output current of 24 mA and a high-level output current of -15 mA.

Feature Summary

• Octal configuration for bidirectional data transfer across eight channels
• Tri-state outputs enable isolation when not actively driving the bus
• Non-inverting polarity maintains signal directionality without phase reversal

Applications

• Memory mapping control circuits
• Clock drivers and buffer applications
• Bidirectional bus architectures requiring high drive capability

Procurement Notes

Verify the specific 'A-1' suffix against official Texas Instruments documentation to confirm pinout or electrical variations compared to standard variants. Ensure the SOIC-20 package matches the target PCB footprint and that the industrial temperature rating aligns with system requirements before finalizing procurement.

Selection Notes

Select this component when TTL-compatible inputs are required alongside CMOS-like outputs. The ALS series offers faster switching speeds than standard LS logic while maintaining lower power consumption. Verify that the 24 mA sink current meets the load requirements of the destination bus lines.

Part Context

This part belongs to the SN74ALS (Advanced Low-power Schottky) family, designed for high-speed digital systems. It serves as a direct functional replacement for older LS245 devices in designs requiring improved speed and reduced power dissipation. The DWR suffix indicates surface-mount packaging suitable for automated assembly processes.

Replacement Considerations

SN74ALS245ANSR is a verified equivalent offering identical logical functionality in an NSOP-20 package.