Part A
AD8571ARZ
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 and AD8572AR are both zero-drift, rail-to-rail operational amplifiers from the same Analog Devices family, sharing identical supply voltage range, input offset voltage characteristics, and gain-bandwidth performance. The primary distinction is channel count: the AD8571ARZ is a single-channel device while the AD8572AR is a dual-channel device. For designs requiring only one amplifier channel, the AD8571ARZ is a direct functional substitute; for dual-channel applications, the AD8572AR is required. Package footprint and pinout differ accordingly, so PCB layout must be reviewed before substitution.
Amplifier Type
High match
Supply Voltage Range
High match
Channel Count
Not compatible
Package and Pinout
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 | AD8571ARZ | AD8572AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 2 | Determines how many independent op-amp channels are available in a single package, directly affecting circuit density and channel count. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating supply window; matching ranges ensure the parts are interchangeable in the same power rail design. |
| Input Offset Voltage (Max) | 5 µV | 5 µV | Ultra-low offset is the defining feature of the AD857x family; identical offset specs preserve precision DC accuracy when substituting. |
| Input Offset Voltage Drift | 0.05 µV/°C | 0.05 µV/°C | Low drift maintains precision over temperature; matching values ensure thermal performance is unchanged between the two parts. |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz | Sets the AC frequency response and closed-loop bandwidth; identical GBW means signal bandwidth behavior is preserved. |
| Supply Current per Amplifier | 0.75 mA | 0.75 mA | Affects power budget; equal per-amplifier current keeps total power consumption predictable when channel count changes. |
| Input Bias Current | 10 pA | 10 pA | Very low bias current suits high-impedance sources; matching values ensure input loading and error contributions remain the same. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Confirms both parts are rated for the same environmental conditions, supporting use in industrial and automotive applications. |
| Package Type | 8-Lead SOIC | 8-Lead SOIC | Package footprint and pinout affect PCB layout; both use 8-lead SOIC but pin assignments differ due to single vs dual channel configuration. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8571ARZ | AD8572AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| 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 AD8571ARZ and the AD8572AR?
The AD8571ARZ is a single-channel zero-drift operational amplifier, while the AD8572AR is a dual-channel zero-drift operational amplifier. Both are members of the Analog Devices AD857x family and share the same core amplifier architecture, but they differ in channel count and package: the AD8571ARZ is offered in an 8-lead SOIC package, and the AD8572AR is offered in an 8-lead SOIC package housing two independent amplifiers.
Are the AD8571ARZ and AD8572AR pin-compatible?
No. The AD8571ARZ is a single amplifier in an 8-lead SOIC with its own pinout, while the AD8572AR is a dual amplifier in an 8-lead SOIC with a different pin assignment. They are not drop-in replacements for each other, and the PCB layout must be designed for the specific channel configuration.
Do the AD8571ARZ and AD8572AR share the same electrical performance specifications?
Yes, the two devices are based on the same zero-drift amplifier core and share comparable key specifications, including low offset voltage, low offset voltage drift, low input bias current, and rail-to-rail input/output operation. Designers should still verify the exact datasheet limits for the specific grade and package before finalizing a design.
What is the supply voltage range for the AD8571ARZ and AD8572AR?
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, as specified in the Analog Devices datasheet. This makes them suitable for low-voltage, battery-powered, and precision signal-conditioning applications.
What are typical applications for the AD8571ARZ and AD8572AR?
These zero-drift amplifiers are typically used in precision sensor signal conditioning, low-offset instrumentation, thermocouple and bridge amplifier circuits, medical instrumentation, and other applications requiring very low offset voltage and offset drift over temperature. The single AD8571ARZ suits space-constrained single-channel designs, while the dual AD8572AR suits multi-channel signal chains.
Can the AD8572AR be used to replace two AD8571ARZ devices in a design?
Functionally, the AD8572AR provides two independent zero-drift amplifiers in one package, so it can replace two single AD8571ARZ devices in terms of channel count. However, the pinout, PCB footprint, and thermal considerations differ, so the layout must be redesigned and the design validated against the AD8572AR datasheet before substitution.
What package options are available for the AD8571ARZ and AD8572AR?
The AD8571ARZ is supplied in an 8-lead SOIC package, and the AD8572AR is supplied in an 8-lead SOIC package. Both are surface-mount packages; designers should confirm the exact package suffix and ordering code against the Analog Devices datasheet and authorized distributor listings.