74VHCT138AMTCX

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74VHCT138AMTCX is a 3-to-8 decoder/demultiplexer fabricated with advanced high-speed CMOS technology. It operates within a DC supply voltage range of 2.0 V to 5.5 V and supports an operating temperature from -40 °C to +85 °C. The device features three binary select inputs (A0, A1, A2) and three enable inputs (E1, E2, E3). When enabled, it drives one of eight outputs (O0-O7) LOW based on the address inputs. It utilizes a TSSOP-16 surface-mount package and includes power-down protection on all pins.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides pin and function compatibility with equivalent Bipolar Schottky TTL devices while maintaining low CMOS power dissipation.
• Includes power-down protection circuits that allow safe application of voltages up to 5.5 V on input and output pins even when the supply voltage is zero.
• Features three enable inputs designed to facilitate cascade connections and serve as address decoders for memory systems.

Signal Switches, Multiplexers, Decoders Applications

• Address decoding for memory systems
• Interfacing between 3 V and 5 V logic systems
• Battery backup system architectures

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'X' corresponds to the Tape & Reel shipping configuration containing 2500 units per reel. Confirm the component meets Pb-Free, Halide Free, and RoHS compliance standards as documented in the manufacturer's ordering information section. Ensure the TSSOP-16 package dimensions align with the target PCB footprint requirements.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a standard 3-to-8 decoding function is required alongside strict low-power consumption constraints. The VHCT series offers performance comparable to Bipolar Schottky TTL but retains the electrical advantages of CMOS technology. Verify that the 2.0 V minimum supply voltage requirement fits the system design parameters.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the VHCT138A family of decoders manufactured by onsemi. It is specifically engineered to bridge the gap between legacy TTL logic levels and modern low-voltage CMOS applications. The device serves as a direct functional replacement for older technologies in mixed-signal environments requiring robust interface capabilities.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The datasheet explicitly states the device is pin and function compatible with the 74HCT138. Designers should verify that the 74HCT138 specifications meet the specific voltage and speed requirements of the existing circuit before substitution.