Part A
AD8571ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2035 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8571ARZ and AD8574AR-REEL share the same zero-drift auto-zero amplifier core, supply range, and SOIC package family, but differ in channel count and integration level. The AD8571ARZ is a single-channel device, while the AD8574AR-REEL integrates four channels in one package, so the AD8574AR-REEL can serve as a functional replacement only where a single amplifier is being replaced by one section of a quad device and the additional channels are acceptable or unused. Designers must validate board footprint, channel utilization, and thermal behavior before substituting.
Amplifier Core Technology
High match
Channel Count
Validation required
Package and Footprint
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
AD8574AR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3142 PCS
- Package
- SOIC-14
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
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 | AD8574AR-REEL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 4 | Determines how many independent signal channels can be processed in one package; a single vs quad device is not a drop-in substitute in multi-channel designs. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 14-Lead SOIC (surface mount) | Different pin counts and footprints require different PCB layouts; the packages are not physically interchangeable. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both operate from the same single-supply range, so system power design constraints are equivalent. |
| 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 Bias Current | ~10 pA (typical) | ~10 pA (typical) | Very low bias current suits high-impedance sensor interfaces; identical values mean equivalent loading on sensitive nodes. |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz | Sets the closed-loop bandwidth achievable; matching GBW means similar dynamic performance for a given gain configuration. |
| Supply Current per Amplifier | ~0.75 mA (typical) | ~0.75 mA (typical) | Affects total power budget; per-amplifier current is the same, though total quiescent current scales with the number of amplifiers. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial/extended temperature ratings mean both are suitable for the same environmental conditions. |
| Input Voltage Noise Density | ~22 nV/√Hz (typical) | ~22 nV/√Hz (typical) | Noise performance is critical for low-level signal amplification; matching noise density preserves signal-to-noise behavior. |
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 | AD8571ARZ | AD8574AR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | Zero-Drift | Zero-Drift |
| Number of Circuits | 1 | 4 |
| 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 | 1 nA |
| Voltage - Input Offset | 1 µV | 1 µV |
| Supply Current | 850µA | 850µA (x4 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 are the key differences between the AD8571ARZ and AD8574AR-REEL?
The AD8571ARZ is a single-channel zero-drift operational amplifier in an 8-lead SOIC package, while the AD8574AR-REEL is a quad-channel zero-drift operational amplifier in a 14-lead SOIC package supplied on tape and reel. Both share the same zero-drift architecture and similar electrical performance per channel, but differ in channel count, package size, and packaging format.
Are the AD8571ARZ and AD8574AR-REEL pin-compatible?
No. The AD8571ARZ uses an 8-lead SOIC package with a single amplifier pinout, while the AD8574AR-REEL uses a 14-lead SOIC package with a quad amplifier pinout. The package footprints and pin functions differ, so they are not drop-in replacements for each other.
Do both parts share the same zero-drift amplifier architecture?
Yes. Both the AD8571 and AD8574 are members of the Analog Devices AD857x zero-drift operational amplifier family, which uses auto-zeroing/chopper-stabilized techniques to achieve very low offset voltage and offset voltage drift. Per-channel performance characteristics are closely related across the family.
What is the difference in packaging format between the two parts?
The AD8571ARZ is supplied in standard tube or tray packaging in an 8-lead SOIC. The AD8574AR-REEL is supplied on tape and reel, which is intended for automated high-volume pick-and-place assembly lines. The "-REEL" suffix indicates the tape-and-reel delivery format.
Can the AD8571ARZ be used where a quad amplifier like the AD8574AR-REEL is required?
No, not directly. The AD8571ARZ provides only one amplifier channel, whereas the AD8574AR-REEL provides four independent channels in a single package. Designs requiring four amplifiers would need four AD8571ARZ devices or a single AD8574AR-REEL, with corresponding PCB layout changes.
Are both parts suitable for low-offset, precision signal conditioning applications?
Yes. Both the AD8571 and AD8574 are designed for precision applications requiring low offset voltage and low offset drift, making them suitable for sensor signal conditioning, precision instrumentation, and low-frequency measurement systems. Designers should verify exact per-channel specifications against the respective manufacturer datasheets.
Which part is better suited for high-volume automated assembly?
The AD8574AR-REEL is better suited for high-volume automated assembly because it is supplied on tape and reel, which is compatible with automated pick-and-place equipment. The AD8571ARZ in standard packaging may require different handling depending on the specific orderable variant.