74ACT257SC

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74ACT257SC is a quad 2-input multiplexer with 3-STATE outputs housed in a 16-Lead Small Outline Integrated Circuit (SOIC). It selects four bits of data from two sources using a common Data Select input, presenting the selected data in true form. The device features TTL-compatible inputs and allows direct interface with bus-oriented systems via high impedance states controlled by an Output Enable input.

Signal Switches, Multiplexers, Decoders Feature Summary

• Noninverting 3-STATE outputs for direct bus interfacing
• TTL-compatible inputs for ACT series logic compatibility
• Multiplexer expansion capability by tying outputs together
• Reduced ICC and IOZ current consumption

Signal Switches, Multiplexers, Decoders Applications

• Bus-oriented system data selection
• Logic implementation of 4-pole, 2-position switches
• Multiplexer expansion configurations

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix to confirm package type, as the base model number corresponds to multiple physical packages including SOIC, SOP, TSSOP, and PDIP. Ensure the required voltage range matches the ACT specification of 4.5V to 5.5V. Confirm that the application environment stays within the recommended operating temperature range of -40°C to +85°C to maintain electrical characteristics.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a quad 2-input multiplexer with noninverting outputs and 3-STATE control is required. The ACT variant ensures compatibility with TTL logic levels at 5V operation. Consider the 16-lead SOIC package for surface mount applications requiring narrow body dimensions. Verify that output loading does not exceed the specified sink/source currents during design.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the 74AC/ACT257 family of quad 2-input multiplexers. It serves as a digital switch controlled by a single select line, routing one of two data sources to four independent outputs. The 3-STATE feature enables multiple devices to share common buses without interference when properly enabled.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include other 74ACT257 variants from different manufacturers, provided they meet the same pinout, electrical specifications, and package dimensions. Cross-reference part numbers such as those ending in SC, SJ, MTC, or PC depending on the required physical package.