MC74AC257MELG

Overview

The MC74AC257MELG is a quad 2-input multiplexer with 3-state outputs manufactured by onsemi. It selects four bits of data from two sources using a common data select input, presenting the selected data in true form. The device operates within a supply voltage range of 2.0 V to 6.0 V and supports an operating temperature range of -40°C to +85°C. Propagation delays are specified as 8.5 ns at 3.3 V and 6.0 ns at 5.0 V. Outputs can be switched to a high impedance state via the Output Enable (OE) input.

Feature Summary

• Quad 2-input multiplexer functionality with noninverting 3-state outputs
• Common data select input controls selection between two data sources
• Outputs switch to high impedance state when Output Enable is HIGH

Applications

• Bus-oriented system interfacing
• Multiplexer expansion by tying outputs together
• Data routing between multiple sources

Procurement Notes

Verify the specific ordering suffix for the MELG package variant against official documentation. Confirm lead times and availability directly with authorized distributors or the manufacturer. Ensure compliance with RoHS requirements and check for any recent product change notices that may affect specifications or packaging.

Selection Notes

Select this component for applications requiring quad 2-input multiplexing with 3-state output control. Consider the AC logic family characteristics for speed and power consumption. Verify that the SOIC-16 or TSSOP-16 package options meet the board layout requirements. Ensure the operating voltage and temperature ranges align with the system design constraints.

Part Context

The MC74AC257 belongs to the 74AC logic series, which offers high-speed operation similar to equivalent bipolar Schottky TTL while maintaining CMOS low power dissipation. This series is designed for general-purpose digital applications requiring reliable switching and noise immunity. The device is available in lead-free packages compliant with environmental standards.

Replacement Considerations

MC74ACT257DR2G is a confirmed substitute part number offering TTL compatible inputs.