Part A
AD8571ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2035 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8571ARZ is a single-channel operational amplifier while the AD8572ARZ is a dual-channel device in the same SOIC-8 package family. Both share the same zero-drift auto-zero architecture, supply voltage range, and rail-to-rail input/output characteristics, making them functionally related but not pin-for-pin interchangeable due to channel count and pinout differences. Designers must account for the additional amplifier stage and revised pin assignments when substituting between these two parts.
Channel Count
Validation required
Amplifier Architecture
High match
Supply Voltage Range
High match
Pin Configuration
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8572ARZ | AD8571ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Determines how many independent amplifier channels are available in one package; a dual cannot directly replace a single in a one-channel circuit without layout changes. |
| Input Offset Voltage (Max) | 1 µV | 1 µV | Ultra-low offset is the defining feature of zero-drift amplifiers; matching values ensure equivalent DC accuracy in precision signal chains. |
| Input Offset Voltage Drift (Max) | 0.005 µV/°C | 0.005 µV/°C | Low drift maintains offset stability over temperature, critical for precision instrumentation and sensor interfaces. |
| Input Bias Current (Typ) | 10 pA | 10 pA | Very low bias current minimizes errors in high-impedance sources such as photodiodes and pH sensors. |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz | Sets the closed-loop bandwidth achievable; identical GBW means equivalent AC performance for a given gain configuration. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines compatibility with single-supply systems; matching ranges allow use in the same power rail designs. |
| Supply Current per Amplifier (Typ) | 0.75 mA | 0.75 mA | Affects power budget; equal per-amplifier current means total quiescent draw scales only with channel count. |
| Input Voltage Noise Density (Typ) | 22 nV/√Hz | 22 nV/√Hz | Determines noise floor in low-level signal amplification; identical noise ensures equivalent SNR performance. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Both use the same 8-lead SOIC footprint, but pinout differs between single and dual devices, so board layout must be verified for substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8571ARZ | AD8572ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Zero-Drift | Zero-Drift |
| Number of Circuits | 1 | 2 |
| 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 | 10 pA | 160 pA |
| Voltage - Input Offset | 1 µV | 1 µV |
| Supply Current | 850µA | 850µA (x2 Channels) |
| Current - Output / Channel | 30 mA | 30 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5.5 V | 5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the primary difference between the AD8572ARZ and AD8571ARZ?
The AD8572ARZ is a dual-channel zero-drift operational amplifier, while the AD8571ARZ is a single-channel version of the same amplifier family. Both are offered in an 8-lead SOIC package (RZ suffix), but the AD8572ARZ integrates two independent amplifiers in one package, whereas the AD8571ARZ contains one amplifier.
Are the AD8572ARZ and AD8571ARZ pin-compatible in the same SOIC-8 footprint?
No. Although both use an 8-lead SOIC package, the pinouts differ because the AD8572ARZ is a dual amplifier and the AD8571ARZ is a single amplifier. The AD8571ARZ uses the standard single op-amp SOIC-8 pinout, while the AD8572ARZ uses the standard dual op-amp SOIC-8 pinout. A direct drop-in substitution in the same PCB land pattern is therefore not possible without layout changes.
Do the AD8572ARZ and AD8571ARZ share the same electrical performance specifications?
Yes, the two devices are based on the same zero-drift amplifier core and share the same key specifications per amplifier, including low offset voltage, low offset voltage drift, low input bias current, and rail-to-rail input/output operation. The primary difference is channel count and package pinout, not the per-amplifier electrical characteristics.
What is the supply voltage range for the AD8572ARZ and AD8571ARZ?
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 portable and battery-powered systems.
Are the AD8572ARZ and AD8571ARZ zero-drift amplifiers?
Yes. Both the AD8572ARZ and AD8571ARZ are zero-drift operational amplifiers that use auto-zeroing techniques to achieve very low offset voltage and near-zero offset voltage drift over temperature and time, making them suitable for precision DC and low-frequency applications.
Can the AD8572ARZ be used as a replacement for two AD8571ARZ devices?
Functionally, the AD8572ARZ provides two amplifiers equivalent to two AD8571ARZ devices, which can reduce board space and component count. However, because the pinouts differ, a PCB redesign is required; the AD8572ARZ cannot be substituted directly into a board laid out for the AD8571ARZ without layout changes.
What are the typical applications for the AD8572ARZ and AD8571ARZ?
Both devices are intended for precision signal conditioning, including sensor interfaces, thermocouple and thermopile amplification, medical instrumentation, and low-level signal amplification where low offset voltage and low drift are critical. The AD8572ARZ is preferred where two matched amplifiers are needed in a compact footprint, while the AD8571ARZ suits single-channel designs.