Part A
AD8671ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7405 PCS
- Package
- SOIC-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Compatible functional replacement candidate
The AD8671ARZ and AD8674AR share the same precision op-amp core and voltage-feedback architecture, making them functionally related but not pin-for-pin interchangeable. The single-channel AD8671ARZ and quad-channel AD8674AR differ primarily in channel count and package, so substitution requires validation of board layout, channel requirements, and thermal considerations before adoption.
Amplifier Architecture
High match
Channel Count
Not compatible
Package Type
Not compatible
Supply Voltage Range
Validation required
Parts at a glance
Part B
AD8674AR
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8542 PCS
- Package
- SOIC-14
- 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 | AD8671ARZ | AD8674AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 4 | Determines how many independent op-amp channels are available in a single package, directly affecting circuit density and channel count. |
| Package / Case | 8-Lead SOIC (SOIC-8) | 14-Lead SOIC (SOIC-14) | Footprint and pin count must match the PCB layout; a different package requires a board redesign and cannot be dropped in directly. |
| 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 noise density is essential for high-resolution and low-level signal amplification; identical values mean equivalent 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 signal handling. |
| Slew Rate | 4 V/µs | 4 V/µs | Determines how fast the output can respond to large signal changes; identical slew rate means comparable large-signal dynamic behavior. |
| Supply Voltage Range | ±5 V to ±15 V (10 V to 30 V) | ±5 V to ±15 V (10 V to 30 V) | Must be compatible with the system power rails; matching ranges allow use in the same supply environment. |
| Input Bias Current (max) | 12 nA | 12 nA | Low bias current minimizes errors in high-impedance circuits; identical values indicate equivalent input loading behavior. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Defines the environmental conditions under which the device is guaranteed to operate; matching ranges ensure equivalent thermal robustness. |
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 | AD8674AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 1 | 4 |
| 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 (x4 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 ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8671ARZ and AD8674AR?
The AD8671ARZ is a single precision operational amplifier in an 8-lead SOIC package, while the AD8674AR is a quad precision operational amplifier in a 14-lead SOIC package. Both share the same core amplifier design with low noise (2.8 nV/√Hz typical), low offset voltage (75 µV maximum), and 10 MHz gain bandwidth, but differ in channel count and package pinout.
Are the AD8671ARZ and AD8674AR electrically identical on a per-channel basis?
Yes. Both devices are based on the same Analog Devices precision op amp core, sharing typical specifications including 2.8 nV/√Hz input voltage noise, 10 MHz gain bandwidth product, 4 V/µs slew rate, and 75 µV maximum input offset voltage. The primary differences are the number of amplifiers per package and the package pinout.
Can the AD8671ARZ be used as a direct replacement for one channel of the AD8674AR?
Functionally, one channel of the AD8674AR performs the same signal-conditioning role as the AD8671ARZ, but they are not pin-to-pin interchangeable because the AD8671ARZ is an 8-lead single amplifier and the AD8674AR is a 14-lead quad amplifier. A PCB redesign or adapter would be required to substitute one for the other.
What are the package and pinout differences between the AD8671ARZ and AD8674AR?
The AD8671ARZ is supplied in an 8-lead SOIC package with standard single-op-amp pinout (offset null, inputs, supply, output). The AD8674AR is supplied in a 14-lead SOIC package with quad-op-amp pinout (four amplifiers sharing common supply pins). The pin counts and pin functions differ, so the PCB footprints are not compatible.
Do the AD8671ARZ and AD8674AR share the same supply voltage range and quiescent current specifications?
Both devices operate from dual supplies of ±5 V to ±15 V (or single supply 10 V to 30 V). Quiescent current differs by channel count: the AD8671ARZ typically draws about 3 mA per amplifier, while the AD8674AR draws approximately 3 mA per amplifier as well, resulting in roughly 12 mA total for the quad versus about 3 mA for the single.
Which applications favor the AD8671ARZ versus the AD8674AR?
The AD8671ARZ is suited to single-channel precision signal chains such as sensor interfaces, active filters, and instrumentation front ends where board space is limited. The AD8674AR is suited to multi-channel systems such as data acquisition, multi-pole active filters, and audio or medical instrumentation where four matched precision amplifiers are needed in one package.
Are the AD8671ARZ and AD8674AR specified over the same temperature range?
Yes. Both the AD8671ARZ and AD8674AR are specified over the industrial temperature range of −40°C to +125°C, allowing them to be used in the same environmental conditions when the channel count and package constraints are satisfied.