ADG739BRUZ vs ADG738BRU

The ADG739BRUZ and ADG738BRU are both CMOS analog multiplexers from Analog Devices in a 16-lead TSSOP package, but they differ in switch configuration and control interface. The ADG739 is a dual 4-to-1 multiplexer, while the ADG738 is an 8-to-1 multiplexer. The ADG739BRUZ uses a 2-bit binary address plus an enable input to select one of four channels per bank, whereas the ADG738BRU uses a 3-bit binary address to select one of eight channels. Both operate from a single +2.7 V to +5.5 V supply or dual ±2.7 V supplies and feature low on-resistance and fast switching.

No. Although both devices are housed in a 16-lead TSSOP (RU suffix), their pin functions differ because the ADG739 is a dual 4-to-1 mux and the ADG738 is an 8-to-1 mux. The address and control pin assignments, as well as the source/drain channel assignments, are not identical, so the PCB layout and control logic must be verified against each device's datasheet before substitution.

Both devices operate from a single supply of +2.7 V to +5.5 V, or from dual supplies of ±2.7 V. This dual-supply capability allows them to handle bipolar analog signals within the supply rails, making them suitable for both single-supply and dual-supply signal routing applications.

Both the ADG739 and ADG738 feature low on-resistance, typically around 4 Ω at a +5 V single supply (and approximately 5 Ω at ±5 V dual supply), with on-resistance flatness specified over the signal range. Designers should consult the respective datasheets for the exact RON and flatness specifications at the specific supply voltage and temperature of their application.

The ADG739BRUZ uses a 2-bit binary address (A0, A1) plus an enable (EN) input to select one of four channels in each of its two multiplexer banks. The ADG738BRU uses a 3-bit binary address (A0, A1, A2) to select one of eight channels. Both are digitally controlled and compatible with standard CMOS/TTL logic levels, allowing direct interfacing with microcontrollers and digital signal processors.

Yes. Both devices are CMOS analog multiplexers with bidirectional switch architecture, meaning the source and drain terminals are interchangeable. They can route analog signals in either direction, making them suitable for multiplexing and demultiplexing applications, as well as for signal switching in data acquisition and audio/video routing systems.

The ADG739BRUZ (dual 4-to-1) is well suited for differential signal routing, dual-channel multiplexing, and applications requiring two independent 4-channel banks. The ADG738BRU (8-to-1) is suited for single-ended 8-channel multiplexing such as multi-sensor data acquisition, test equipment, and signal selection where a single bank of eight inputs is required. Both are used in portable instrumentation, communication systems, and automatic test equipment.

Both devices offer fast switching times in the tens of nanoseconds range (typical transition times on the order of 20–30 ns at +5 V), but exact timing parameters such as tON, tOFF, and break-before-make delay should be verified individually in each datasheet. Because the channel count and address decoding differ, the propagation and settling behavior may vary slightly between the two parts, so timing-critical designs should be validated against the specific device's specifications.