Part A
AD7709ARU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1879 PCS
- Package
- TSSOP-24
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7709ARUZ and AD7709ARU are functionally equivalent signal-conditioning ADCs from the same manufacturer family, sharing identical core architecture, resolution, and interface characteristics. The only meaningful distinction is the package finish (Pb-free/RoHS-compliant versus leaded), which does not affect electrical performance. The AD7709ARUZ is a suitable functional replacement candidate for the AD7709ARU, subject to confirming RoHS compliance requirements for the target assembly.
Resolution and ADC Architecture
High match
Package Type and Pinout
High match
Supply Voltage and Interface
High match
Package Finish and RoHS Compliance
Validation required
Parts at a glance
Part B
AD7709ARUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1974 PCS
- Package
- TSSOP-24
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7709ARUZ | AD7709ARU | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Same manufacturer ensures consistent design IP and support. |
| Resolution | 16 bit | 16 bit | ADC resolution determines the smallest signal change the converter can resolve. |
| Number of Channels | 4 | 4 | Channel count defines how many analog inputs can be measured without external multiplexing. |
| Interface Type | SPI | SPI | The digital interface must match the host microcontroller for direct communication. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range must be compatible with the system power rail. |
| Package / Case | 24-TSSOP | 24-TSSOP | Package footprint must match the PCB land pattern for drop-in substitution. |
| Mounting Type | Surface Mount | Surface Mount | Mounting style must match the assembly process and board design. |
| Packaging / Ordering Suffix | Tube (Z = RoHS-compliant) | Tube (non-Z suffix) | The Z suffix denotes RoHS compliance, which affects regulatory and environmental requirements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application's environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7709ARU | AD7709ARUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 105 | 105 |
| Number of Inputs | 2, 4 | 2, 4 |
| Input Type | Differential, Pseudo-Differential | Differential, Pseudo-Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.3V, 5V | 2.7V ~ 3.3V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.3V, 5V | 2.7V ~ 3.3V, 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between the AD7709ARUZ and the AD7709ARU?
The AD7709ARUZ and AD7709ARU are both 16-bit sigma-delta ADCs from Analog Devices in a 24-lead TSSOP package. The primary difference is the suffix: the "Z" designation on the AD7709ARUZ indicates RoHS-compliant, lead-free (Pb-free) construction, while the AD7709ARU is the non-RoHS, lead-containing (Pb) version. Functionally, both parts share the same datasheet specifications.
Are the AD7709ARUZ and AD7709ARU electrically and functionally interchangeable?
Yes. Both devices are the same AD7709 converter core with identical electrical specifications, pinout, and package footprint. The only documented difference is the RoHS/lead-free status indicated by the "Z" suffix. They can be interchanged in designs where the assembly process and compliance requirements permit either leaded or lead-free soldering.
What are the key specifications of the AD7709?
The AD7709 is a 16-bit sigma-delta ADC with an on-chip programmable gain amplifier (PGA) and a precision current source, intended for low-frequency measurement applications such as smart transmitters and temperature/pressure sensing. It operates from a single 3 V or 5 V supply and communicates via a serial interface. Refer to the official Analog Devices AD7709 datasheet for the complete, verified parameter set.
Does the "Z" suffix affect the package or pinout?
No. Both the AD7709ARUZ and AD7709ARU use the same 24-lead TSSOP package with an identical pin configuration. The "Z" suffix denotes RoHS compliance and lead-free termination finish, not a change in package outline or pin assignment.
Which part should be selected for a RoHS-compliant design?
The AD7709ARUZ should be selected for RoHS-compliant designs, as its "Z" suffix confirms lead-free, RoHS-compliant construction. The AD7709ARU is the non-RoHS version and should not be used where RoHS compliance is required.
Can the AD7709ARUZ and AD7709ARU be used in the same PCB assembly process?
They share the same package and footprint, but their termination finishes differ (lead-free versus leaded). Solder profile and process compatibility should be validated for the specific finish used. For a single assembly process, using one variant consistently is recommended to avoid mixing leaded and lead-free finishes.
Where can verified technical data for these parts be obtained?
Verified parameters, package drawings, and ordering information are available from the official Analog Devices AD7709 datasheet and from authorized distributors such as DigiKey, Mouser, and TTI. Always confirm the exact orderable part number and RoHS status against the manufacturer's current documentation before design release.