Part A
AD8675ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5946 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8675ARZ and AD8672AR-REEL7 are both dual-channel precision operational amplifiers from Analog Devices in the same SOIC-8 package, sharing a compatible supply range and pinout. The AD8675ARZ offers lower voltage noise and lower input bias current, making it a strong functional candidate for the AD8672AR-REEL7 in precision signal-conditioning applications, provided the design validates the slightly reduced gain bandwidth and the absence of a shutdown feature.
Channel Count
High match
Package Type
High match
Gain Bandwidth Product
Validation required
Shutdown Feature
Not compatible
Parts at a glance
Part B
AD8672AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2165 PCS
- Package
- SOIC-8
- 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 | AD8675ARZ | AD8672AR-REEL7 | 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 accuracy; a difference here affects precision in high-gain or low-level signal applications. |
| Input Voltage Noise Density (1 kHz) | 2.8 nV/√Hz | 8 nV/√Hz | Noise density directly impacts the achievable signal-to-noise ratio in low-noise analog front ends; the lower-noise part is preferred for sensitive sensing circuits. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | GBW sets the closed-loop bandwidth and stability margin; matching values indicate similar AC response for filtering and buffering stages. |
| Supply Current per Amplifier (typ) | 2.5 mA | 3 mA | Quiescent current affects power budget and thermal load; differences matter in battery-powered or densely packed designs. |
| Input Bias Current (typ) | 0.5 nA | 12 nA | Low bias current reduces errors in high-impedance source applications such as photodiode and sensor interfaces. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Package compatibility determines whether the part can be dropped into the same footprint; identical packages simplify substitution. |
| Supply Voltage Range | ±5 V to ±15 V (10 V to 30 V) | ±5 V to ±15 V (10 V to 30 V) | Operating supply range must cover the system rails; matching ranges allow use in the same power architecture. |
| Slew Rate | 2.5 V/µs | 5 V/µs | Slew rate limits large-signal bandwidth and settling; a faster part may be needed for high-frequency or fast-transient signals. |
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-REEL7 |
|---|---|---|
| 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-REEL7?
The AD8675ARZ is a single, precision, low-noise operational amplifier in an 8-lead SOIC package, while the AD8672AR-REEL7 is a dual, precision, low-noise operational amplifier supplied in a 7-inch reel in an 8-lead SOIC package. The AD8675 offers lower voltage noise (2.8 nV/√Hz typical) and lower offset voltage than the AD8672, which has a typical voltage noise of 10 nV/√Hz. The AD8672 provides two amplifiers per package, whereas the AD8675 provides one.
Are the AD8675ARZ and AD8672AR-REEL7 pin-compatible?
No. Although both are 8-lead SOIC devices, their pinouts differ because the AD8675 is a single amplifier and the AD8672 is a dual amplifier. The AD8675 uses the standard single op-amp pinout (offset null, inputs, supply, output), while the AD8672 uses the standard dual op-amp pinout (two sets of inputs and outputs with shared supplies). They cannot be interchanged without PCB redesign.
Which part has lower voltage noise, the AD8675ARZ or the AD8672AR-REEL7?
The AD8675ARZ has lower voltage noise. Its typical input voltage noise density is 2.8 nV/√Hz at 1 kHz, whereas the AD8672AR-REEL7 has a typical input voltage noise density of 10 nV/√Hz at 1 kHz. The AD8675 is therefore better suited to low-noise signal-conditioning applications.
What are the supply voltage ranges for the AD8675ARZ and AD8672AR-REEL7?
Both devices operate from dual supplies of ±5 V to ±15 V (or single supplies of 10 V to 30 V). The AD8675ARZ and AD8672AR-REEL7 are specified for operation over the extended industrial temperature range of −40°C to +125°C.
Can the AD8672AR-REEL7 be used to replace two AD8675ARZ amplifiers in an existing design?
Functionally, the AD8672AR-REEL7 provides two amplifiers in one package, but it is not a drop-in replacement for two AD8675ARZ devices. The AD8672 has higher voltage noise (10 nV/√Hz typical versus 2.8 nV/√Hz for the AD8675) and different offset voltage and drift specifications. The PCB layout and pinout must also be redesigned. Replacement is only valid after verifying that the AD8672's noise, offset, and bandwidth specifications meet the application requirements.
What is the packaging difference between the AD8675ARZ and AD8672AR-REEL7?
Both parts are offered in an 8-lead SOIC package. The AD8675ARZ is supplied in standard tube or tray packaging, while the AD8672AR-REEL7 suffix indicates a 7-inch tape-and-reel packaging format intended for automated assembly. The "ARZ" suffix on the AD8675 denotes the RoHS-compliant SOIC package.
Which part is better suited for low-noise precision instrumentation?
The AD8675ARZ is generally better suited for low-noise precision instrumentation because of its lower voltage noise (2.8 nV/√Hz typical) and lower offset voltage. The AD8672AR-REEL7, with 10 nV/√Hz typical voltage noise, is appropriate for dual-channel applications where moderate noise performance and board-space savings are more important than the lowest possible noise floor.