SN74HC138DG4

Overview

The SN74HC138DG4 is a 3-to-8 line decoder and demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and functions across an operating temperature range of -40°C to +85°C. The device utilizes a 16-pin Small Outline Integrated Circuit (SOIC) package with a body size of 9.90 mm x 3.90 mm. It features three binary select inputs (A, B, C), one active-high enable input (G1), and two active-low enable inputs (G2A, G2B). Outputs are active low, pulling the selected line low while others remain high.

Feature Summary

• Designed for high-speed memory decoding and data-routing applications requiring short propagation delays.
• Incorporates three enable inputs to simplify cascading or data reception without external gates.
• Outputs can drive up to 10 LSTTL loads with balanced output drive capabilities.

Applications

• LED Displays
• Servers
• White Goods

Procurement Notes

Verify the specific ordering suffix 'DG4' against current manufacturer documentation to confirm RoHS compliance status and lead finish specifications. Confirm that the SOIC-16 package dimensions match the design footprint requirements. Ensure the component meets the required operating temperature range for the intended environment.

Selection Notes

Select this component when a CMOS 3-to-8 decoder is needed for systems operating between 2 V and 6 V. It is suitable for designs requiring low power consumption and the ability to drive multiple LSTTL loads. Consider the SOIC package constraints and thermal resistance values if high-density mounting is required.

Part Context

This part belongs to the SNx4HC138 family of decoders and demultiplexers from Texas Instruments. The HC series indicates High-Speed CMOS technology. The 'D' suffix denotes the SOIC package, while 'G4' typically signifies Green/RoHS-compliant manufacturing. It serves as a digital logic solution for address decoding and signal routing.

Replacement Considerations

SN74HC138DR

FAQ

How many enable inputs does the SN74HC138DG4 have?

The device has three enable inputs: one active-high (G1) and two active-low (G2A, G2B).

What is the state of the outputs when no selection is made?

When not enabled or when all outputs are deselected, all eight outputs (Y0-Y7) are pulled HIGH.