Part A
AD8671ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7405 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8671ARZ and AD8672AR are both precision, low-noise operational amplifiers from the same Analog Devices family, sharing identical supply voltage ranges, input offset voltage grades, and noise performance. The primary distinction is channel count: the AD8671ARZ is a single-channel device while the AD8672AR is a dual-channel device. For designs requiring only one amplifier channel, the AD8671ARZ is the appropriate choice; for dual-channel requirements, the AD8672AR should be selected. They are not pin-for-pin interchangeable due to differing package pinouts and channel configurations, but they are functionally equivalent per channel and suitable as a design-family replacement when channel count is adjusted accordingly.
Channel Count
Validation required
Supply Voltage Range
High match
Input Offset Voltage Grade
High match
Package Type
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 | AD8671ARZ | AD8672AR | 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. |
| Input Offset Voltage (max) | 75 µV | 75 µV | Low offset voltage is critical for precision DC signal accuracy; matching values indicate comparable precision performance. |
| Input Voltage Noise Density | 2.8 nV/√Hz | 2.8 nV/√Hz | Low voltage noise is essential for low-level signal amplification; identical noise specs mean similar signal-to-noise performance. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | Defines the frequency range over which the amplifier provides useful gain; matching GBW supports equivalent AC performance. |
| Slew Rate | 4 V/µs | 4 V/µs | Determines how fast the output can respond to input changes; identical slew rates indicate comparable large-signal dynamic behavior. |
| Supply Voltage Range | ±5 V to ±15 V | ±5 V to ±15 V | Defines the operating supply window; matching ranges ensure the parts are interchangeable in the same power rail configuration. |
| Supply Current per Amplifier (typ) | 3 mA | 3 mA | Affects power budget and thermal design; equal per-amplifier current means similar power consumption per channel. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package footprint and pinout affect PCB layout and drop-in compatibility; both use the same 8-lead SOIC outline. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Defines the environmental range for reliable operation; matching ranges ensure equivalent robustness in industrial applications. |
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 | AD8671ARZ | AD8672AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 1 | 2 |
| Slew Rate | 4V/µs | 4V/µs |
| Gain Bandwidth Product | 10 MHz | 10 MHz |
| Current - Input Bias | 3 nA | 3 nA |
| Voltage - Input Offset | 20 µV | 20 µV |
| Supply Current | 3mA | 3mA (x2 Channels) |
| Current - Output / Channel | 20 mA | 20 mA |
| Voltage - Supply Span(Min) | 10 V | 10 V |
| Voltage - Supply Span(Max) | 36 V | 36 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 AD8671ARZ and AD8672AR?
The AD8671ARZ is a single precision operational amplifier, while the AD8672AR is a dual precision operational amplifier. Both are offered in 8-lead SOIC packages, but the AD8671ARZ uses the single-channel pinout and the AD8672AR uses the dual-channel pinout. The AD8672AR provides two independent amplifiers in one package, whereas the AD8671ARZ provides one amplifier.
Are the AD8671ARZ and AD8672AR electrically identical per amplifier?
Yes. Both parts are members of the same AD8671/AD8672/AD8674 precision op amp family and share the same core amplifier design and specified performance per channel, including low noise, low offset voltage, and low input bias current. The primary difference is channel count and package pinout.
Can the AD8671ARZ be used as a direct substitute for one channel of the AD8672AR?
Functionally, one channel of the AD8672AR performs the same amplification function as the AD8671ARZ, but a direct drop-in substitution is not possible because the package pinouts differ. The AD8671ARZ single pinout and the AD8672AR dual pinout assign different functions to the same package pins, so the PCB layout must be designed for the specific part.
What are the package and pinout differences between the AD8671ARZ and AD8672AR?
Both devices are available in 8-lead SOIC packages. The AD8671ARZ single amplifier uses the standard single-op-amp 8-lead SOIC pinout, while the AD8672AR dual amplifier uses the standard dual-op-amp 8-lead SOIC pinout with two sets of inputs and outputs plus shared supply pins. The pin functions are not interchangeable between the two pinouts.
Do the AD8671ARZ and AD8672AR share the same supply voltage range and quiescent current specifications?
Both devices operate from dual supplies of ±5 V to ±15 V (or equivalent single-supply ranges within the family specification) and are specified for the same supply voltage conditions. Quiescent current is specified per amplifier, so the AD8672AR dual draws approximately twice the total quiescent current of the AD8671ARZ single because it contains two amplifiers.
Which part should be selected for a design requiring two precision amplifier channels?
The AD8672AR is the appropriate choice when two precision amplifier channels are required in a single 8-lead SOIC package, as it integrates two amplifiers and reduces board space and component count compared with using two AD8671ARZ devices. The AD8671ARZ remains suitable for single-channel applications.
Are the AD8671ARZ and AD8672AR specified with the same noise and offset performance?
Yes. As members of the same precision op amp family, both the AD8671ARZ and AD8672AR are specified with the same low voltage noise density and low offset voltage characteristics per amplifier, based on the manufacturer datasheet. Designers should confirm the exact grade and specification limits in the official datasheet for the ordered part number.