SN74AHCT138PWRG4

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT138PWRG4 is a 3-line to 8-line decoder/demultiplexer from the AHCT logic family, manufactured by Texas Instruments. It operates within a supply voltage range of 1.5 V to 5.5 V and features TTL-compatible inputs. The device utilizes a 16-pin TSSOP package with an operating temperature range of -40°C to +85°C. Key electrical characteristics include propagation delays of up to 12 ns at 5 V with 15 pF load, output currents of ±8 mA, and high ESD protection ratings exceeding ±2000 V (HBM) and ±1000 V (CDM).

Signal Switches, Multiplexers, Decoders Feature Summary

• TTL-voltage compatible inputs for direct interfacing with standard logic systems.
• Three enable inputs (one active-high, two active-low) simplify cascading and data reception.
• Designed for high-speed memory decoding and data-routing applications requiring short propagation delays.
• Robust electrostatic discharge protection exceeding JESD standards.

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding systems.
• Data-transmission systems requiring fast signal routing.
• Cascaded decoding configurations for expanded address lines.

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'G4' corresponds to lead-free packaging and RoHS compliance as indicated in manufacturer documentation. Confirm the package type matches the required PCB footprint. Ensure the component status is listed as active production rather than obsolete or preproduction before finalizing procurement plans.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-level input compatibility is required alongside CMOS performance. The AHCT series bridges the gap between older TTL logic families and modern low-power CMOS designs. Consider the thermal resistance and power dissipation characteristics if multiple units are deployed in dense layouts.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SNx4AHCT138 family of 3-line to 8-line decoders. The 'PWR' designation indicates a TSSOP-16 surface-mount package, while the 'G4' suffix typically denotes environmental compliance features such as lead-free construction. It serves as a digital logic solution for address decoding and signal distribution.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHCT138DR

Signal Switches, Multiplexers, Decoders FAQ

What is the function of the G1, G2A, and G2B pins?

These are enable inputs. G1 is active-high, while G2A and G2B are active-low. All three must be in their active states for the decoder to operate; otherwise, all outputs remain high.

How does the device handle unused inputs?

All unused inputs must be connected to either VCC or GND to prevent undefined operational states. Floating inputs can cause excessive current consumption and unpredictable behavior.