74HCT42D,653

Signal Switches, Multiplexers, Decoders Overview

The 74HCT42D,653 is a BCD to decimal decoder manufactured by Nexperia. It accepts four binary-coded decimal inputs (0A to 3A) and provides ten mutually exclusive outputs (0Y to 9Y). The device operates on a supply voltage range of 2.0 V to 6.0 V. It features CMOS low power dissipation and high noise immunity. Inputs include clamp diodes for interfacing with voltages exceeding VCC. The logic design ensures all outputs are HIGH when input codes exceed nine.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides ten mutually exclusive outputs corresponding to BCD inputs
• Outputs disabled for input codes greater than nine
• Includes input clamp diodes for over-voltage protection
• Supports 1-of-8 demultiplexing using the most significant input

Signal Switches, Multiplexers, Decoders Applications

• BCD to decimal decoding circuits
• Demultiplexer applications
• Display driver interfaces

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the component matches the specific HCT logic family requirements rather than standard HC specifications. Confirm the SO16 package variant aligns with board layout constraints. Ensure operating conditions remain within the specified temperature and voltage limits defined in the datasheet.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a single-channel BCD to decimal conversion is required. The HCT series ensures compatibility with TTL logic levels while maintaining CMOS performance. Consider the propagation delay characteristics relative to system timing requirements before finalizing the design.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74HC/HCT logic family, widely used for general-purpose digital logic functions. The 'D' suffix indicates the SO16 plastic small outline package. The ',653' suffix typically denotes tape and reel packaging for automated assembly processes.

Signal Switches, Multiplexers, Decoders FAQ

What happens when input codes greater than nine are applied?

All outputs (0Y to 9Y) are driven to a HIGH state.

Can the most significant input be used for other functions?

Yes, input 3A can serve as an inhibit function for 1-of-8 decoding or as a data input for demultiplexing.