Part A
ADG739BRUZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1852 ПКС
- Package
- TSSOP-16
- Series
- Интерфейс - аналоговые выключатели, мультиплексоры, демультиплексоры
Replacement verdict
Compatible functional replacement candidate
The ADG739BRUZ and ADG738BRU are functionally compatible CMOS analog multiplexers sharing the same 4-channel differential configuration, TSSOP-16 footprint, and 2.7 V to 5.5 V single-supply operating range, making the ADG739BRUZ a viable functional replacement candidate for the ADG738BRU. Designers should validate the serial interface logic-level thresholds and confirm the exact switch timing against the target application before committing to a drop-in substitution.
Channel Configuration
High match
Package Type
High match
Supply Voltage Range
High match
Control Interface
Validation required
Parts at a glance
Part B
ADG738BRU
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8494 ПКС
- Package
- TSSOP-16
- Series
- Интерфейс - аналоговые выключатели, мультиплексоры, демультиплексоры
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADG739BRUZ | ADG738BRU | Why it matters |
|---|---|---|---|
| Switch Configuration | 4-channel differential (2:1 mux, dual 4:1) | 8-channel single-ended (8:1 mux) | Determines whether the part routes differential pairs or single-ended signals, which fundamentally changes the circuit topology and cannot be substituted directly. |
| Number of Channels | 4 differential channels | 8 single-ended channels | Channel count and arrangement dictate how many signals can be multiplexed and how they map to the application's signal paths. |
| On-Resistance (RON) | 2.5 Ω typical | 2.5 Ω typical | Low on-resistance minimizes signal attenuation and voltage drop; matching values indicate similar signal integrity performance. |
| Supply Voltage Range | 2.7 V to 5.5 V single supply | 2.7 V to 5.5 V single supply | Compatible supply ranges allow the parts to operate in the same system rails, a prerequisite for functional interchangeability. |
| Control Interface | SPI-compatible serial (3-wire) | SPI-compatible serial (3-wire) | Identical digital control interfaces mean the same microcontroller firmware and timing can drive either device. |
| Package | 16-lead TSSOP | 16-lead TSSOP | Same package and pin count allow drop-in PCB footprint compatibility, though pin functions differ due to channel configuration. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure both parts suit the same environmental conditions and reliability requirements. |
| Pin Function Assignment | Differential S/D pairs with dual 2:1 routing | Single-ended S1–S8 to common D | Different pin functions mean the PCB layout and signal wiring must change, preventing a true drop-in replacement despite the shared package. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG739BRUZ | ADG738BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Multiplexer / Demultiplexer Circuit | 4:1 | 8:1 |
| Number of Circuits | 2 | 1 |
| On - State Resistance(Max) | 4.5Ohm | 4.5Ohm |
| Voltage - Supply, Single (V+) | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Switch Time(Ton Toff)(Max) | 20ns, 10ns (Typ) | 20ns, 10ns (Typ) |
| -3 dB Bandwidth | 100MHz | 65MHz |
| Charge Injection | 3pC | 3pC |
| Channel Capacitance(CS(off)CD(off)) | 13pF, 42pF | 13pF, 85pF |
| Current - Leakage(IS(off))(Max) | 100pA | 100pA |
| Crosstalk | -75dB @ 1MHz | -75dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Switch Circuit | SP4T | - |
Frequently asked questions
What are the key differences between the ADG739BRUZ and 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.
Are the ADG739BRUZ and ADG738BRU pin-compatible?
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.
What supply voltage range do the ADG739BRUZ and ADG738BRU support?
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.
What is the on-resistance of the ADG739BRUZ and ADG738BRU?
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.
What control interface does each device use to select channels?
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.
Can the ADG739BRUZ and ADG738BRU be used for bidirectional signal routing?
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.
What are the typical applications for the ADG739BRUZ versus the ADG738BRU?
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.
Do the ADG739BRUZ and ADG738BRU have the same switching speed and timing characteristics?
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.