SN74AC238PWRQ1

Signal Switches, Multiplexers, Decoders Overview

The SN74AC238PWRQ1 is an automotive-grade 3-line to 8-line decoder and demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 1.5V to 6V and supports an operating temperature from -40°C to +125°C. The device features balanced CMOS push-pull outputs capable of continuous ±24mA drive at 5V, with short bursts up to ±75mA. Propagation delay reaches a maximum of 10ns at 5V with a 50pF load. It is housed in a 16-pin TSSOP (PW) package.

Signal Switches, Multiplexers, Decoders Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classification levels.
• Wide operating voltage range supporting 1.5V to 6V inputs and outputs.
• Balanced CMOS push-pull outputs providing high current drive capabilities for transmission lines.
• Three strobe inputs (G1, G2, G0) enable cascading and demultiplexing functions.

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 ordering suffix matches the required package type, as the SN74AC238-Q1 family includes both TSSOP and WQFN options. Confirm that the 'Q1' designation aligns with automotive qualification requirements. Check the latest packaging addendum for lead finish and reflow profile details to ensure compatibility with assembly processes. Validate that the active production status remains current before finalizing procurement plans.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring reliable address decoding or data routing in automotive environments. The wide voltage range accommodates various logic levels, while the robust output drive simplifies interface design. Ensure input transition rates meet specifications to prevent oscillation. Consider thermal management if driving heavy capacitive loads, although standard logic applications typically do not require extensive heat dissipation strategies.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74AC238-Q1 series, which represents high-speed silicon gate CMOS decoders designed for automotive use. It complements other logic families by offering enhanced speed and drive strength compared to standard variants. The Q1 suffix indicates compliance with automotive reliability standards, distinguishing it from commercial grade counterparts within the broader SN74AC product line.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AC238WBQBRQ1 offers the same logical function in a WQFN package format.

Signal Switches, Multiplexers, Decoders FAQ

How are unused inputs handled?

Unused standard CMOS inputs must be terminated to VCC or ground. Leaving them floating can cause excessive power consumption and oscillations. A pull-up or pull-down resistor is recommended if the input is not always actively driven.

What is the maximum output drive capability?

The device provides continuous ±24mA output drive at 5V. It supports short bursts of up to ±75mA output drive at 5V, provided no more than one output is tested at a time for durations not exceeding 2 ms.