Part A
AD8599ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5652 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8599ARZ and AD8594ARZ are both quad low-noise operational amplifiers in the same SOIC-14 package with identical pinout and supply voltage range, making the AD8594ARZ a viable functional replacement candidate for the AD8599ARZ in many applications. However, designers should validate bandwidth, noise, and quiescent current requirements against the target circuit before committing to a substitution.
Package Type
High match
Pin Configuration
High match
Gain Bandwidth Product
Validation required
Input Voltage Noise
Validation required
Parts at a glance
Part B
AD8594ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9885 Stückzahl
- Package
- SOIC-16
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8599ARZ | AD8594ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 4 (Quad) | Channel count determines how many independent signal paths can be handled; a dual cannot directly replace a quad in multi-channel designs. |
| Input Voltage Noise Density | 1.07 nV/√Hz (typ) | 5.5 nV/√Hz (typ) | Lower noise density improves signal-to-noise ratio in low-level signal amplification; the AD8599 is significantly quieter. |
| Gain Bandwidth Product | 10 MHz (typ) | 3 MHz (typ) | GBP sets the achievable closed-loop bandwidth; the AD8599 supports wider-bandwidth signal processing. |
| Slew Rate | 16 V/µs (typ) | 5 V/µs (typ) | Higher slew rate enables faster large-signal response and reduces distortion at high frequencies. |
| Input Offset Voltage | 10 µV (typ), 120 µV (max) | 500 µV (typ), 2500 µV (max) | Lower offset voltage reduces DC error in precision amplification; the AD8599 is far more precise. |
| Supply Current per Amplifier | ~1.1 mA (typ) | ~1.0 mA (typ) | Quiescent current affects power budget; similar per-amplifier draw but total differs with channel count. |
| Supply Voltage Range | ±5 V to ±15 V (dual supply) | ±5 V to ±15 V (dual supply) | Matching supply ranges allow both parts to operate in the same power rails without redesign. |
| Package Type | 8-Lead SOIC (N) | 14-Lead SOIC (N) | Different pin counts and footprints prevent direct drop-in replacement on the same PCB layout. |
| Input Bias Current | ~25 nA (typ) | ~50 nA (typ) | Lower bias current reduces errors in high-impedance circuits; the AD8599 offers better performance here. |
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 | AD8599ARZ | AD8594ARZ |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 2 | 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) | 30 V | 6 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Supply Current | 5mA (x2 Channels) | - |
Frequently asked questions
What are the primary differences between the AD8599ARZ and AD8594ARZ?
The AD8599ARZ is a dual, ultralow-noise operational amplifier, while the AD8594ARZ is a quad, low-noise operational amplifier. The AD8599ARZ offers two amplifiers per package with typical voltage noise density of 1.07 nV/√Hz at 1 kHz, whereas the AD8594ARZ integrates four amplifiers per package with typical voltage noise density of 8 nV/√Hz at 1 kHz. Both are specified for operation over the −40°C to +125°C temperature range and are housed in 8-lead and 14-lead SOIC packages, respectively.
Are the AD8599ARZ and AD8594ARZ pin-compatible?
No. The AD8599ARZ is supplied in an 8-lead SOIC package, and the AD8594ARZ is supplied in a 14-lead SOIC package. The differing package sizes and pin counts mean they are not drop-in replacements for one another and require different PCB footprints.
What are the supply voltage ranges for the AD8599ARZ and AD8594ARZ?
Both devices operate from dual supplies of ±2.5 V to ±15 V, or equivalently from single supplies of 5 V to 30 V. Designers should confirm the exact supply range and associated specifications in the respective Analog Devices datasheets before finalizing a design.
How do the noise specifications of the AD8599ARZ and AD8594ARZ compare?
The AD8599ARZ is specified with a typical voltage noise density of 1.07 nV/√Hz at 1 kHz, making it suitable for ultralow-noise signal chains. The AD8594ARZ is specified with a typical voltage noise density of 8 nV/√Hz at 1 kHz, which is higher but still appropriate for many general-purpose low-noise applications. The AD8599ARZ is therefore preferable where the lowest possible noise floor is required.
What are the gain bandwidth and slew rate specifications for these amplifiers?
The AD8599ARZ has a typical gain bandwidth product of 10 MHz and a typical slew rate of 16 V/µs. The AD8594ARZ has a typical gain bandwidth product of 10 MHz and a typical slew rate of 10 V/µs. These parameters should be verified against the latest Analog Devices datasheets for the specific grade and package.
Can the AD8594ARZ be used as a replacement for the AD8599ARZ in an existing design?
Not directly. Although both are low-noise operational amplifiers, they differ in package pin count (8-lead versus 14-lead SOIC), channel count (dual versus quad), and noise performance (1.07 nV/√Hz versus 8 nV/√Hz typical at 1 kHz). A replacement would require PCB redesign, revalidation of noise budget, and confirmation that the higher noise density of the AD8594ARZ is acceptable for the application.
What are the input offset voltage specifications for the AD8599ARZ and AD8594ARZ?
The AD8599ARZ is specified with a typical input offset voltage of 10 µV and a maximum of 120 µV. The AD8594ARZ is specified with a typical input offset voltage of 0.5 mV and a maximum of 3 mV. The AD8599ARZ therefore offers significantly better DC precision, which matters in high-gain or precision instrumentation designs.
In which applications is the AD8599ARZ typically preferred over the AD8594ARZ?
The AD8599ARZ is typically preferred in applications demanding ultralow voltage noise and low offset voltage, such as precision instrumentation, medical imaging front ends, and high-resolution ADC drivers. The AD8594ARZ is typically chosen where four low-noise amplifiers are needed in a single package and the lower noise floor of the AD8599ARZ is not required, such as multi-channel signal conditioning and active filtering.