SN74AHC238QWBQBRQ1

Signal Switches, Multiplexers, Decoders Overview

The SN74AHC238QWBQBRQ1 is an automotive-grade, three-to-eight noninverting decoder/demultiplexer from Texas Instruments. It operates within a supply voltage range of 2V to 5.5V and supports junction temperatures from -40°C to +125°C. The device features balanced CMOS push-pull outputs with a maximum propagation delay of 10.5ns at 5V. It includes latch-up performance exceeding 250mA per JESD 17 and meets AEC-Q100 Grade 1 standards. The component utilizes a 16-pin WQFN package with wettable flanks for enhanced solder joint inspection.

Signal Switches, Multiplexers, Decoders Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classifications
• Balanced CMOS push-pull outputs providing high drive capability for memory selection and data routing
• Wettable flank QFN package design facilitating reliable side fillet formation and automatic optical inspection

Signal Switches, Multiplexers, Decoders Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data in solid state memory systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix matches the required package type and reel configuration. Confirm that the wettable flank feature is present if automated optical inspection compatibility is required. Ensure the selected variant aligns with the intended operating temperature range and voltage specifications for the target automotive application.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a high-speed, automotive-qualified decoder is needed for memory addressing or data multiplexing. The balanced push-pull output structure supports driving larger currents compared to standard logic families. Consider the thermal characteristics and layout requirements associated with the WQFN package for optimal performance in space-constrained designs.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74AHC238-Q1 family of automotive decoders. It shares functional similarities with other members like the SN74HCS238QBQBRQ1 but differs in electrical characteristics such as input/output speed and voltage ranges. The 'Q' designation indicates automotive qualification, while 'WBQBRQ1' specifies the WQFN package with wettable flanks and tape-and-reel packaging.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHC238PWPRQ1 (TSSOP package)

Signal Switches, Multiplexers, Decoders FAQ

How does the demultiplexing function operate on this device?

Demultiplexing is achieved by using the address select inputs to choose the desired output and then utilizing one of the strobe inputs as the data input.

What is the purpose of the three strobe inputs?

The three strobe inputs (G2, G1, and G0) simplify cascading and facilitate demultiplexing. When any input strobe is active, all outputs are forced into the low state.