Part A
AD8597ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6698 PCS
- Package
- SOIC-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Not a drop-in replacement
The AD8597ARZ and AD8594ARZ are not drop-in replacements for each other. The AD8597ARZ is a single-channel ultralow-noise operational amplifier, while the AD8594ARZ is a quad-channel general-purpose amplifier with different noise, bandwidth, and supply characteristics. Designers must account for channel count, noise performance, package footprint, and supply voltage differences before considering any substitution.
Different channel count
Different noise performance
Different bandwidth
Different supply range
Parts at a glance
Part B
AD8594ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 9885 PCS
- Package
- SOIC-16
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8597ARZ | AD8594ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 4 | Channel count determines how many independent signal paths can be processed in one package; a single vs quad device is not a drop-in substitute in multi-channel designs. |
| Input Voltage Noise Density | 1.1 nV/√Hz (typ) | 6 nV/√Hz (typ) | Lower noise density directly improves signal-to-noise ratio in low-level signal amplification; the AD8597 is significantly quieter than the AD8594. |
| Gain Bandwidth Product | 10 MHz (typ) | 3 MHz (typ) | GBW sets the maximum usable frequency for a given closed-loop gain; the AD8597 supports wider-bandwidth signal chains than the AD8594. |
| Supply Current per Amplifier | ~5 mA (typ) | ~1.4 mA (typ) | Quiescent current affects power budget and thermal design; the AD8594 is substantially more power-efficient per amplifier. |
| Input Offset Voltage | 10 µV (max) | 500 µV (max) | Offset voltage limits DC accuracy; the AD8597 offers far tighter offset, which matters for precision instrumentation and sensor interfaces. |
| Slew Rate | ~14 V/µs | ~2 V/µs | Slew rate limits large-signal transient response; the AD8597 handles faster edges and higher-frequency large signals than the AD8594. |
| Package | 8-lead SOIC | 14-lead SOIC | Different package footprints and pin counts prevent direct board-level substitution without layout changes. |
| Supply Voltage Range | ±5 V to ±15 V (dual supply) | ±2.5 V to ±15 V (dual supply) | The AD8594 can operate at lower supply voltages, enabling use in lower-voltage systems where the AD8597 would not meet minimum supply requirements. |
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 | AD8597ARZ | AD8594ARZ |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 1 | 4 |
| Output Type | - | Rail-to-Rail |
| Slew Rate | 16V/µs | 5V/µs |
| Gain Bandwidth Product | 10 MHz | 3 MHz |
| Current - Input Bias | 25 nA | 5 pA |
| Voltage - Input Offset | 10 µV | 2 mV |
| Current - Output / Channel | 52 mA | 250 mA |
| Voltage - Supply Span(Min) | 9 V | 2.5 V |
| Voltage - Supply Span(Max) | 36 V | 6 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Supply Current | 5mA | - |
Frequently asked questions
What are the key differences between the AD8597ARZ and AD8594ARZ?
The AD8597ARZ is a single ultra-low-noise, low-distortion operational amplifier, while the AD8594ARZ is a quad low-noise operational amplifier. The AD8597ARZ is optimized for very low voltage noise (approximately 1 nV/√Hz) and is offered in an 8-lead SOIC package, whereas the AD8594ARZ integrates four amplifiers in a 14-lead SOIC package with somewhat higher noise specifications.
Are the AD8597ARZ and AD8594ARZ pin-compatible?
No. The AD8597ARZ is a single amplifier in an 8-lead SOIC package, and the AD8594ARZ is a quad amplifier in a 14-lead SOIC package. They have different pin counts and pin functions, so they are not pin-compatible and cannot be interchanged on the same PCB footprint.
Can the AD8597ARZ be used as a direct substitute for the AD8594ARZ?
No. Beyond the package and pin count differences, the AD8597ARZ provides one amplifier while the AD8594ARZ provides four. A direct substitution would require a redesign of the board layout and verification of the noise, bandwidth, and supply requirements against the manufacturer datasheets.
How do the noise specifications of the AD8597ARZ and AD8594ARZ compare?
The AD8597ARZ is specified with ultra-low voltage noise of approximately 1 nV/√Hz at 1 kHz, making it suitable for precision low-noise signal chains. The AD8594ARZ is a low-noise quad amplifier but its voltage noise density is higher than that of the AD8597ARZ. Designers should consult the respective Analog Devices datasheets for exact noise curves versus frequency.
What are the supply voltage ranges for the AD8597ARZ and AD8594ARZ?
Both devices are designed to operate from dual supplies. The AD8597ARZ operates over a supply range of approximately ±5 V to ±15 V, and the AD8594ARZ operates over a comparable dual-supply range. Exact minimum and maximum supply limits, including single-supply operation, should be confirmed in the official Analog Devices datasheets before use.
Which applications favor the AD8597ARZ versus the AD8594ARZ?
The AD8597ARZ is typically chosen for high-performance single-channel applications requiring very low noise and low distortion, such as precision instrumentation and audio signal conditioning. The AD8594ARZ is suited to multichannel designs where four low-noise amplifiers are needed in a compact 14-lead SOIC package, reducing board space and component count.
Do both the AD8597ARZ and AD8594ARZ come in the same package type?
Both are offered in SOIC packages, but with different pin counts: the AD8597ARZ in an 8-lead SOIC and the AD8594ARZ in a 14-lead SOIC. The "ARZ" suffix in both part numbers indicates the SOIC package and the RoHS-compliant industrial temperature grade per Analog Devices nomenclature.