SN74ALS257ADG4

Overview

The SN74ALS257ADG4 is a quad 2-line to 1-line data selector/multiplexer from Texas Instruments, belonging to the ALS logic series. It features four independent multiplexers with true outputs and three-state control. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a propagation delay of 12 ns. It is housed in a 16-SOIC package (0.154 inch width) designed for surface-mount installation. The component functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Provides four independent 2-to-1 data selection paths with true outputs
• Integrates three-state output control for bus-oriented systems
• Utilizes Advanced Low-Power Schottky (ALS) technology for optimized speed-power performance

Applications

• Bus-oriented memory addressing
• Data routing in digital communication systems
• Signal selection in instrumentation circuits

Procurement Notes

Verify the specific suffix 'DG4' indicates the lead-free RoHS-compliant variant of the standard SN74ALS257AD. Confirm the 16-SOIC package dimensions match your PCB footprint requirements. Ensure the supplier provides valid RoHS3 compliance documentation. Check that the component status is active or note any discontinuance notifications from Texas Instruments before finalizing procurement.

Selection Notes

Select this component when high-speed data switching is required with low power consumption compared to standard LS logic. The ALS series offers faster propagation delays than LS equivalents while maintaining lower power than AS series devices. Choose the SOIC package for automated surface-mount assembly processes. Verify that the 5V logic level compatibility matches the system's input/output voltage standards.

Part Context

This part belongs to the SN74ALS257A family of quadruple 2-line to 1-line data selectors. It is functionally compatible with other 74ALS multiplexers but distinguished by its specific package and lead-free manufacturing process. The DG4 suffix specifically denotes the environmental compliance version of the standard AD package, ensuring adherence to modern regulatory standards for electronic components.

Replacement Considerations

SN74ALS257AD is the non-RoHS equivalent. SN74AS257D offers faster performance but higher power consumption. SN74LS257 provides slower operation with lower cost. Verify pinout compatibility and electrical characteristics before substituting.