SN74HCT138PWRE4

Overview

The SN74HCT138PWRE4 is a 3-line to 8-line decoder/demultiplexer from the HCT logic family, housed in a 16-pin TSSOP package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of -40°C to +85°C. The device features three address inputs (A, B, C) and three enable inputs (G1, G2A, G2B). Propagation delay times are specified at 45 ns maximum for address inputs and 42 ns maximum for enable inputs at 5.5 V. Output drive capabilities include up to 10 LSTTL loads with ±4 mA output current.

Feature Summary

• Incorporates three enable inputs to simplify cascading and data reception applications
• Designed specifically for high-speed memory decoders and data transmission systems
• Inputs are TTL-voltage compatible with low input current characteristics

Applications

• High-performance memory decoding
• Data routing systems
• Demultiplexing applications

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to lead-free packaging and RoHS compliance as defined in Texas Instruments documentation. Confirm the specific tape and reel dimensions match the required automated assembly equipment specifications. Ensure the component status is listed as active production rather than obsolete or preproduction before finalizing procurement plans.

Selection Notes

Select this component when TTL-compatible logic levels are required alongside CMOS performance benefits. The HCT series ensures compatibility with standard TTL circuits while offering lower power consumption. Verify that the 16-pin TSSOP package fits the available board space and thermal constraints. Consider the propagation delay specifications against the system timing requirements for memory access cycles.

Part Context

This part belongs to the SNx4HCT138 family of 3-line to 8-line decoders manufactured by Texas Instruments. The 'SN74' prefix indicates commercial grade availability, while 'HCT' denotes High-speed CMOS technology with TTL-compatible inputs. The 'PW' suffix identifies the 16-pin Thin Shrink Small Outline Package, and 'RE4' specifies the reel-based packaging format compliant with environmental standards.

Replacement Considerations

SN74HCT138PWR and SN74HCT138PWRG4 are functionally equivalent parts within the same product family.