SN74AC139PWRQ1

Signal Switches, Multiplexers, Decoders Overview

The SN74AC139PWRQ1 is an automotive-grade dual 2-to-4 decoder/demultiplexer from Texas Instruments. It operates within a supply voltage range of 1.5V to 6V and supports a wide operating temperature range from -40°C to +125°C. The device features balanced CMOS push-pull outputs capable of continuous ±24mA drive at 5V, with short bursts supporting up to ±75mA. Propagation delay (tpd) is typically 8.9ns at 5V with a 50pF load. It includes AEC-Q100 qualification, HBM ESD Level 2, and CDM ESD Level C4B ratings.

Signal Switches, Multiplexers, Decoders Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classifications.
• Balanced CMOS push-pull outputs provide high drive capability suitable for driving transmission lines.
• Dual independent channels allow simultaneous decoding or 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 package variant against the datasheet, as the SN74AC139-Q1 family includes both TSSOP and WQFN options. Confirm that the ordering suffix matches the desired physical footprint and lead configuration. Ensure the component meets the required AEC-Q100 reliability standards for the target automotive environment before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring two independent 2-to-4 decoding paths in an automotive context. It is appropriate for memory addressing where GPIO pins are limited. Consider the 1.5V to 6V operating range for compatibility with various logic levels. Verify thermal performance if driving heavy loads near the absolute maximum current ratings.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74AC139-Q1 series of automotive decoders. It provides two separate 2-to-4 decoder circuits within a single package. The AC logic family offers higher speed compared to standard HC counterparts while maintaining CMOS power efficiency. The Q1 suffix indicates automotive qualification.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AC139PW

Signal Switches, Multiplexers, Decoders FAQ

How does the strobe input affect the decoder outputs?

When the output strobe input is HIGH, all outputs are forced into the high state regardless of address inputs. When the strobe is LOW, the selected output goes low while others remain high.

What is the maximum continuous output current?

The device supports a continuous output current of ±24mA at 5V. Short bursts can support up to ±75mA, but only one output should be tested at this level for durations not exceeding 2ms.