Part A
AD8675ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5946 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8675ARZ and AD8672AR are both precision operational amplifiers from Analog Devices in the same SOIC-8 package, sharing identical pinout and supply voltage range, making the AD8675ARZ a viable functional replacement candidate for the AD8672AR in many precision signal-conditioning applications. However, the AD8675ARZ is a single-channel device while the AD8672AR is a dual-channel device, so channel count and per-board amplifier density must be validated before substitution. Designers should also confirm noise, bandwidth, and quiescent current margins against the target circuit requirements.
Channel Count
Validation required
Package Type
High match
Supply Voltage Range
High match
Noise and Bandwidth
Validation required
Parts at a glance
Part B
AD8672AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 629 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8675ARZ | AD8672AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 2 | Channel count determines whether the part can serve single or dual signal paths; a dual op-amp cannot directly replace a single in a one-channel layout without layout changes. |
| Input Offset Voltage (max) | 75 µV | 125 µV | Lower offset voltage improves DC precision; substituting a higher-offset device can introduce measurable error in precision signal chains. |
| Input Voltage Noise Density (1 kHz) | 2.8 nV/√Hz | 8 nV/√Hz | Noise density directly affects the achievable signal-to-noise ratio; a higher-noise substitute degrades performance in low-level sensor and audio applications. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | GBW sets the closed-loop bandwidth and stability margin; matching values support similar dynamic response in feedback networks. |
| Supply Voltage Range | ±5 V to ±15 V (10 V to 30 V) | ±5 V to ±15 V (10 V to 30 V) | Compatible supply ranges allow the substitute to operate in the same rail configuration without redesigning the power stage. |
| Input Bias Current (max) | 10 nA | 12 nA | Bias current interacts with source impedance to create offset errors; similar values preserve accuracy in high-impedance circuits. |
| Slew Rate | 2.5 V/µs | 5 V/µs | Slew rate limits large-signal bandwidth and settling; a faster device may alter transient behavior and stability in existing compensation networks. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout enable drop-in board replacement without mechanical or footprint changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Matching temperature ratings ensure the substitute meets the same environmental and reliability requirements. |
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 | AD8675ARZ | 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 | 2.5V/µs | 4V/µs |
| Gain Bandwidth Product | 10 MHz | 10 MHz |
| Current - Input Bias | 500 pA | 3 nA |
| Voltage - Input Offset | 10 µV | 20 µV |
| Supply Current | 2.5mA | 3mA (x2 Channels) |
| Current - Output / Channel | 35 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 |
| Output Type | Rail-to-Rail | - |
Frequently asked questions
What are the primary differences between the AD8675ARZ and AD8672AR?
The AD8675ARZ is a single, precision, low-noise operational amplifier, while the AD8672AR is a dual, precision, low-noise operational amplifier. Both are offered in an 8-lead SOIC package, but the AD8675ARZ uses the single-op-amp pinout and the AD8672AR uses the dual-op-amp pinout. The AD8675ARZ is specified with lower voltage noise (2.8 nV/√Hz typical) and lower offset voltage than the AD8672AR, which is specified at 8 nV/√Hz typical voltage noise.
Can the AD8675ARZ be used as a direct drop-in replacement for the AD8672AR?
No. Although both devices share the same 8-lead SOIC package outline, their pinouts differ: the AD8675ARZ is a single op amp with null/offset pins, whereas the AD8672AR is a dual op amp with two independent amplifiers. A direct drop-in substitution is not possible without PCB layout changes and validation against the manufacturer datasheets.
How do the voltage noise specifications of the AD8675ARZ and AD8672AR compare?
The AD8675ARZ is specified with a typical input voltage noise density of 2.8 nV/√Hz at 1 kHz, making it the lower-noise option. The AD8672AR is specified with a typical input voltage noise density of 8 nV/√Hz at 1 kHz. Designs requiring the lowest noise should favor the AD8675ARZ, subject to the single-amplifier channel count.
What are the supply voltage and quiescent current characteristics of these amplifiers?
Both the AD8675ARZ and AD8672AR operate from dual supplies of ±5 V to ±15 V (or equivalent single supplies of 10 V to 30 V). The AD8675ARZ typically draws about 2.5 mA of supply current per amplifier, while the AD8672AR typically draws about 3 mA per amplifier. Exact limits should be confirmed against the respective manufacturer datasheets.
Which device is better suited for multichannel signal conditioning?
The AD8672AR is generally better suited for multichannel signal conditioning because it integrates two independent precision op amps in a single 8-lead SOIC package, reducing board space and component count. The AD8675ARZ provides only one amplifier per package and is preferable when a single, lower-noise channel is required.
Do the AD8675ARZ and AD8672AR share the same operating temperature range?
Both devices are specified for the industrial temperature range of −40 °C to +125 °C. Designers should still verify the exact grade and temperature specifications on the manufacturer datasheet for the specific orderable part number.
What are the offset voltage characteristics of the AD8675ARZ and AD8672AR?
The AD8675ARZ is specified with a maximum input offset voltage of 75 µV, while the AD8672AR is specified with a maximum input offset voltage of 125 µV. The AD8675ARZ therefore offers tighter DC precision, which is advantageous in high-gain or precision instrumentation applications.