SN74AC139WBQBRQ1

Signal Switches, Multiplexers, Decoders Overview

The SN74AC139WBQBRQ1 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 an operating temperature range of -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. It includes two independent channels, each with two address select inputs and one active-low output strobe. Propagation delay is typically 9.5ns at 5V with a 50pF load. It is housed in a 16-pin WQFN package.

Signal Switches, Multiplexers, Decoders Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classifications.
• Contains two independent 2-to-4 decoders or demultiplexers with active-low output strobes.
• Balanced CMOS push-pull outputs provide high drive capability suitable for transmission lines.
• Wettable flank QFN package design facilitates 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

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix matches the required package type, as the SN74AC139-Q1 family includes multiple packages such as TSSOP and WQFN. Confirm that the wettable flank feature is present if automatic optical inspection compatibility is required. Ensure the selected variant meets the specific thermal and electrical requirements for the target automotive application environment.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring dual decoding or demultiplexing functions within a single package. It is suitable for memory addressing where limited GPIO pins are available on the system controller. Consider the wide supply voltage range and high-speed performance for low-voltage logic interfaces. Verify that the output drive current requirements do not exceed the continuous or burst limits defined in the datasheet.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74AC139-Q1 series of automotive dual 2-to-4 decoders. It is part of Texas Instruments' broader portfolio of AC logic devices designed for high-speed applications. The 'Q1' suffix indicates qualification for automotive use, while the 'WBQB' suffix specifies the WQFN package with wettable flanks. It complements other logic families like AHC and LV for various voltage and speed requirements.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AC139PWQBRQ1 (TSSOP package)

Signal Switches, Multiplexers, Decoders FAQ

How does the output strobe input function?

The output strobe input (G) is active low. When G is HIGH, all outputs are forced into the high state. When G is LOW, the decoder functions normally, selecting one output to go low based on the address inputs.

What is the maximum continuous output current?

The device supports a continuous output drive of ±24mA at 5V. It can also support short bursts of up to ±75mA at 5V, provided the duration does not exceed 2ms and only one output is tested at a time.