CD74HC138MTG4

Signal Switches, Multiplexers, Decoders Overview

The CD74HC138MTG4 is a high-speed CMOS logic component manufactured by Texas Instruments, belonging to the HC/UH series. It functions as a single 3-to-8 line decoder or demultiplexer housed in a 16-pin TSSOP package. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -55 °C to +125 °C. Key electrical characteristics include a maximum propagation delay of 45 ns at 6 V and a maximum low-level output current of 4 mA. The circuit features three binary address inputs (A0, A1, A2) and three enable inputs (two active-low, one active-high) to facilitate system expansion.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features three binary address inputs to select one of eight outputs for decoding or data routing applications.
• Includes two active-low and one active-high enable inputs to simplify cascading without external inverters.
• Outputs are capable of driving up to ten Low-Power Schottky TTL loads.

Signal Switches, Multiplexers, Decoders Applications

• Memory address decoding in high-performance storage systems.
• Data routing and distribution in digital circuits.
• System expansion through cascaded decoder configurations.

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'MTG4' against the official Texas Instruments datasheet to confirm the TSSOP-16 package and industrial temperature grade. Ensure the component matches the RoHS compliance status indicated in the manufacturer's documentation. Cross-reference the part number with authorized distributors to confirm availability and authenticity, as generic listings may not reflect the exact manufacturing revision.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a wide operating voltage range (2 V to 6 V) and extended temperature capability (-55 °C to +125 °C) are required. It is suitable for designs needing fast switching speeds comparable to LS-TTL but with CMOS power efficiency. Verify that the TSSOP-16 footprint aligns with the PCB layout constraints and that the 45 ns propagation delay meets the system timing requirements.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the Texas Instruments SN74HC/CD74HC family of high-speed CMOS logic devices. These components are designed to offer performance similar to Low-Power Schottky TTL while maintaining lower power consumption typical of CMOS technology. The HC138 variant specifically provides 3-to-8 decoding functionality, widely used in microprocessor-based systems for memory mapping and I/O selection.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the SN74HC138DR and SN74HC138NSRG4 from Texas Instruments, which share identical logical functionality. Other manufacturers offering pin-compatible equivalents include ON Semiconductor (MC74HC138) and NXP Semiconductors (74HC138). Verify package dimensions and electrical specifications before substitution.