SN74AHCT138PWR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT138PWR is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments AHCT logic family, housed in a 16-pin TSSOP package. It operates within a supply voltage range of 1.5 V to 5.5 V and supports an industrial temperature range of -40°C to +85°C. The device features TTL-compatible inputs and provides low propagation delays, typically 12 ns at 5 V with 50 pF load. It includes three enable inputs (one active-high, two active-low) for simplified cascading.

Signal Switches, Multiplexers, Decoders Feature Summary

• TTL-voltage compatible inputs ensure seamless integration with legacy logic systems.
• Three enable inputs facilitate easy expansion and system-level control without external inverters.
• High-speed performance optimized for high-performance memory decoding applications.

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding
• Data-routing systems
• Cascaded decoder configurations

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'PWR' corresponds to the TSSOP-16 package and tape-and-reel quantity. Confirm the operating temperature grade matches the design requirements, as other suffixes may indicate different thermal ranges. Ensure the component status is listed as Active Production rather than Obsolete or Pre-production before finalizing procurement plans.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL input compatibility is required alongside high-speed CMOS performance. The AHCT series bridges the gap between older TTL standards and modern low-voltage CMOS technologies. Consider the specific enable pin configuration if complex cascading schemes are necessary for the target application architecture.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SNx4AHCT138 family of 3-line to 8-line decoders. The 'SN74' prefix indicates commercial-grade temperature ratings, while 'AHCT' specifies the high-speed CMOS technology with TTL-compatible inputs. The 'PW' suffix denotes the Thin-Shrink Small-Outline Package (TSSOP), suitable for space-constrained surface-mount designs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct functional equivalents include SN74AHCT138DR (SOIC package) and SN74AHCT138DBR (SSOP package). Verify pinout compatibility and package dimensions when substituting, as electrical characteristics remain consistent across the AHCT138 family variants.

Signal Switches, Multiplexers, Decoders FAQ

How many enable inputs does the SN74AHCT138PWR have?

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

What is the maximum supply voltage for this decoder?

The recommended operating conditions specify a maximum supply voltage (VCC) of 5.5 V.