Texas Instruments

SN74HCT138PW

SN74HCT138PW Description

The SN74HCT138PW from Texas Instruments is a high-speed CMOS 1-of-8 decoder/demultiplexer designed for 4.5V to 5.5V single-supply operation. Housed in a 16-pin TSSOP (Thin Shrink Small Outline Package), this device is ideal for space-constrained surface-mount (SMT) applications. It features a 3-to-8 line decoding function, enabling efficient address decoding in microprocessor/microcontroller systems. With 4mA output drive capability (sink/source), it ensures robust signal integrity in digital logic circuits. The 74HCT series offers TTL-compatible inputs, making it versatile for mixed-voltage designs while maintaining low power consumption typical of CMOS technology.

SN74HCT138PW Features

• Decoder/Demultiplexer Functionality: Converts 3 binary inputs into 8 mutually exclusive active-low outputs.
• Wide Operating Voltage (4.5V–5.5V): Compatible with standard 5V logic systems.
• High Noise Immunity: CMOS technology ensures reliable performance in noisy environments.
• Balanced Output Drive (4mA): Symmetrical sourcing/sinking capability simplifies interfacing.
• TTL-Compatible Inputs: Directly interfaces with TTL logic levels (0V–0.8V for LOW, 2V–VCC for HIGH).
• Low Power Consumption: Typical ICC of 4µA (static) minimizes energy use.
• Robust Packaging: TSSOP-16 offers compact footprint for high-density PCBs.
• Compliance: RoHS3, REACH Unaffected, and MSL1 (Unlimited) for environmental and handling flexibility.

SN74HCT138PW Applications

• Memory Address Decoding: Efficiently selects memory blocks in microcontrollers or FPGAs.
• Data Routing: Acts as a demultiplexer to distribute signals in communication systems.
• Industrial Control Systems: Used in PLCs for I/O expansion and signal distribution.
• Automotive Electronics: Reliable decoding for infotainment or sensor interfaces.
• Consumer Electronics: Enables LED matrix control or keypad scanning in embedded devices.

Conclusion of SN74HCT138PW

The SN74HCT138PW stands out for its high-speed operation, low power consumption, and TTL compatibility, making it a preferred choice for 5V logic systems. Its compact TSSOP package and 4mA balanced drive cater to modern PCB designs requiring density and noise resilience. Whether in embedded systems, automotive modules, or industrial automation, this decoder/demultiplexer delivers precision and reliability, backed by Texas Instruments' quality assurance.