SN74ACT139PWRQ1

Signal Switches, Multiplexers, Decoders Overview

The SN74ACT139PWRQ1 is an automotive-grade dual 2-to-4 decoder and demultiplexer from Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and supports a temperature range of -40°C to +125°C. The device features TTL-compatible inputs and balanced CMOS push-pull outputs capable of continuous ±24mA drive at 5V, with short burst support up to ±75mA. Propagation delays are specified with a maximum of 10.4ns. It is qualified under AEC-Q100 standards.

Signal Switches, Multiplexers, Decoders Feature Summary

• AEC-Q100 qualified for automotive applications with defined temperature grades and ESD classifications.
• TTL-compatible CMOS inputs designed for direct interfacing with standard logic devices.
• Balanced CMOS push-pull outputs providing high current drive capabilities for transmission lines.

Signal Switches, Multiplexers, Decoders Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package variant (TSSOP or WQFN) against the orderable part number suffix. Confirm that the application environment strictly adheres to the recommended operating conditions regarding supply voltage and thermal limits. Ensure input signals transition rapidly to prevent oscillation and excessive power consumption due to the TTL-compatible nature of the inputs.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing automotive systems requiring reliable address decoding or data routing. The device is suitable for solid-state memory applications where multiple devices share a data bus. Consider the available packages, including options with wettable flanks for improved inspection reliability, based on the specific PCB layout and manufacturing requirements.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SN74ACT139-Q1 family of automotive decoders. It integrates two independent 2-to-4 decoders into a single package. The ACT series utilizes silicon gate CMOS technology to provide high-speed operation while maintaining compatibility with TTL logic levels. The Q1 suffix indicates qualification for automotive use according to AEC-Q100 standards.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74ACT139PWRQ1.A

Signal Switches, Multiplexers, Decoders FAQ

How does the device function as a demultiplexer?

The demultiplexing function is achieved by using the address select inputs to choose the desired output and then using the strobe input as the data input. The data appears non-inverted at the selected output.

What happens if the strobe input is inactive?

When the strobe input is inactive (HIGH), the outputs for that channel are all forced into the high state, regardless of the address select inputs.