Part A
AD8574ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7036 PCS
- Package
- SOIC-14
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Compatible functional replacement candidate
The AD8571AR and AD8574ARZ share the same zero-drift auto-zero amplifier core, supply range, and gain-bandwidth, making the AD8571AR a viable functional substitute for single-channel applications. However, the AD8574ARZ is a quad-channel device in a 14-lead SOIC package, so the AD8571AR cannot replace it where four independent amplifiers or the existing SOIC-14 footprint are required. Designers must confirm channel count and board layout before substituting.
Channel Count
Not compatible
Package Type
Not compatible
Supply Voltage Range
High match
Gain Bandwidth Product
High match
Parts at a glance
Part B
AD8571AR
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8060 PCS
- Package
- SOIC-8
- 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 | AD8574ARZ | AD8571AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 (Quad) | 1 (Single) | Determines how many independent op-amp channels are available in one package; a quad cannot directly replace a single in a single-channel circuit without layout changes. |
| Package / Mounting | 14-Lead SOIC (Surface Mount) | 8-Lead SOIC (Surface Mount) | Footprint and pin count differ, so the PCB layout and pad geometry are not interchangeable between the two parts. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both operate over the same single-supply range, allowing use in identical low-voltage systems. |
| Input Offset Voltage (Max) | 1 µV | 1 µV | Ultra-low offset is the defining feature of the AD857x family; matching offset ensures comparable DC accuracy in precision applications. |
| Input Offset Voltage Drift | 0.005 µV/°C | 0.005 µV/°C | Very low drift maintains precision over temperature, so both parts behave equivalently in thermally varying environments. |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz | Identical bandwidth means AC response and stability characteristics are the same for a given closed-loop configuration. |
| Supply Current per Amplifier | ~0.75 mA (typ) | ~0.75 mA (typ) | Per-amplifier quiescent current is the same, so power budgeting scales only with the number of channels used. |
| Input Bias Current | ~10 pA (typ) | ~10 pA (typ) | Extremely low bias current suits high-impedance sensor interfaces; matching values preserve input loading behavior. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Same industrial/extended temperature rating allows use in equivalent environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8574ARZ | AD8571AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Zero-Drift | Chopper (Zero-Drift) |
| Number of Circuits | 4 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.4V/µs | 0.4V/µs |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz |
| Current - Input Bias | 1 nA | 10 pA |
| Voltage - Input Offset | 1 µV | 1 µV |
| Supply Current | 850µA (x4 Channels) | 850µA |
| Current - Output / Channel | 30 mA | 30 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8574ARZ and AD8571AR?
The AD8574ARZ is a quad-channel zero-drift operational amplifier, while the AD8571AR is a single-channel zero-drift operational amplifier from the same AD857x family. Both share similar per-channel specifications, but the AD8574ARZ integrates four amplifiers in a 14-lead SOIC package, whereas the AD8571AR provides one amplifier in an 8-lead SOIC package.
Are the AD8574ARZ and AD8571AR electrically identical on a per-channel basis?
Yes. Both devices are members of the AD857x zero-drift amplifier family and share the same core amplifier design, including typical offset voltage of 1 µV, offset voltage drift of 0.005 µV/°C, and a gain bandwidth product of 1.5 MHz. Per-channel electrical performance is essentially equivalent.
Can the AD8571AR be used as a direct replacement for one channel of the AD8574ARZ?
Functionally, the AD8571AR provides the same amplifier performance as a single channel of the AD8574ARZ, but it is not a drop-in replacement because the package, pinout, and channel count differ. The AD8571AR is an 8-lead SOIC single, while the AD8574ARZ is a 14-lead SOIC quad; the PCB footprint and pin assignments must be redesigned accordingly.
What supply voltage range do the AD8574ARZ and AD8571AR support?
Both devices operate from a single supply of 2.7 V to 5 V, or from dual supplies of ±1.35 V to ±2.5 V. This makes them suitable for low-voltage, precision signal-conditioning applications in both single-supply and bipolar configurations.
What are the package and pin count differences between the AD8574ARZ and AD8571AR?
The AD8574ARZ is supplied in a 14-lead SOIC package (ARZ suffix) containing four independent amplifiers. The AD8571AR is supplied in an 8-lead SOIC package containing a single amplifier. The differing pin counts and pinouts mean the two devices are not footprint-compatible.
Do both the AD8574ARZ and AD8571AR feature rail-to-rail input and output operation?
Yes. Both the AD8574ARZ and AD8571AR are rail-to-rail input and output (RRIO) amplifiers, allowing signal swing close to both supply rails. This is beneficial for maximizing dynamic range in low-voltage precision systems.
Which applications typically favor the AD8574ARZ versus the AD8571AR?
The AD8574ARZ is typically chosen for multi-channel precision systems such as sensor signal conditioning, instrumentation, and filter banks where four matched zero-drift amplifiers are needed in a compact footprint. The AD8571AR is typically chosen for single-channel precision applications where board space and channel count favor a single amplifier in an 8-lead package.
Do the AD8574ARZ and AD8571AR share the same temperature range and offset drift characteristics?
Yes. Both devices are specified over the extended industrial temperature range of −40 °C to +125 °C and feature very low offset voltage drift, typically 0.005 µV/°C, owing to their zero-drift (auto-zeroing) architecture. These characteristics are consistent across the AD857x family.