SN74F138N

Overview

The SN74F138N is a 3-to-8 line decoder and demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features a 16-pin PDIP package designed for through-hole mounting. The device functions across an operating temperature range from 0°C to +70°C, providing standard logic decoding capabilities suitable for general-purpose digital applications requiring reliable signal routing.

Feature Summary

• Provides three address inputs to select one of eight active-low outputs
• Includes three enable inputs for chip control and system expansion
• Designed for through-hole PCB integration using a standard 16-pin DIP format

Applications

• Address decoding in microprocessor systems
• Data distribution in multiplexed display drivers
• Control logic for peripheral selection

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and electrical characteristics. Ensure the procurement source provides valid RoHS compliance data and confirms the PDIP-16 package type matches design requirements before ordering.

Selection Notes

Select this component when a robust through-hole solution is required for 3-to-8 decoding tasks. Compare propagation delay specifications against system timing constraints. Verify that the 5V logic family aligns with existing circuit interfaces and power supply rails.

Part Context

This part belongs to the SN74F series of high-speed logic devices. It serves as a fundamental building block for digital systems, offering faster switching speeds compared to older LS variants while maintaining compatible pinouts for legacy designs.

Replacement Considerations

SN74LS138N offers slower performance but identical pinouts. SN74HC138N provides CMOS technology with lower power consumption. Verify voltage tolerance and speed requirements when substituting.