SN74HC138DBR

Overview

The SN74HC138DBR is a single 3-to-8 decoder and demultiplexer manufactured by Texas Instruments in the HC logic family. It operates within a supply voltage range of 2 V to 6 V and features active-low outputs. The device incorporates three enable inputs (one high-active, two low-active) to facilitate cascading or data reception applications. Designed for high-speed memory decoding and data routing, it minimizes system propagation delay. The component is housed in a 16-pin SSOP package with a nominal body size of 6.20 mm x 5.30 mm.

Feature Summary

• Incorporates three enable inputs to simplify cascading or data reception
• Active-low outputs selected by binary address inputs
• Designed for high-speed memory decoding and data-routing applications

Applications

• LED Displays
• Servers
• White Goods
• Power Infrastructure
• Building Automation

Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SSOP package and tape-and-reel carrier configuration. Confirm RoHS compliance status and lead finish specifications against the latest manufacturer documentation. Ensure the operating temperature range meets the -40°C to +85°C requirement for the intended environment.

Selection Notes

Select this component when a 3-to-8 decoding function is required with minimal propagation delay in CMOS systems. The wide operating voltage range supports various logic levels. Verify that the SSOP package dimensions fit the PCB layout constraints and that the thermal resistance characteristics are adequate for the application's power dissipation requirements.

Part Context

This part belongs to the SNx4HC138 series of 3-line to 8-line decoders and demultiplexers. The 'SN' prefix indicates commercial grade operation, while 'HC' denotes High-speed CMOS technology. The 'DBR' suffix specifies the SSOP surface-mount package and reel packaging format, distinguishing it from other variants like SOIC or PDIP packages.

Replacement Considerations

Compatible substitutes include SN74HC138DR (SOIC package) and SN74HC138PWR (TSSOP package). These alternatives share identical electrical characteristics but differ in physical package dimensions and pin spacing. Verify mechanical compatibility before substitution.