Part A
AD8066ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2596 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The AD8066ARZ and AD8061AR are not drop-in replacements for one another. The AD8066ARZ is a dual-channel, high-performance voltage-feedback amplifier in an 8-lead SOIC package, while the AD8061AR is a single-channel, low-power amplifier in an 8-lead SOIC package with a different pinout and lower bandwidth. Designers must account for differences in channel count, bandwidth, supply current, and pin configuration before considering substitution.
Different channel count
Different bandwidth
Different supply current
Different pin configuration
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8066ARZ | AD8061AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines whether one package can serve two signal paths or only one, directly affecting board layout and part count. |
| Gain Bandwidth Product | 145 MHz | 300 MHz | GBW sets the maximum usable bandwidth for a given closed-loop gain; the AD8061 offers roughly twice the small-signal bandwidth. |
| Slew Rate | 180 V/µs | 650 V/µs | Higher slew rate supports faster large-signal transitions and reduces distortion at high frequencies. |
| Input Voltage Noise Density | 7 nV/√Hz | 8.5 nV/√Hz | Lower input noise improves signal-to-noise ratio in low-level signal amplification stages. |
| Supply Voltage Range | 5 V to 24 V (±2.5 V to ±12 V) | 2.7 V to 10 V (±1.35 V to ±5 V) | The wider supply range of the AD8066 allows operation on higher-voltage rails, while the AD8061 targets lower-voltage systems. |
| Quiescent Supply Current (per amplifier) | 6.4 mA typ | 6.8 mA typ | Quiescent current affects total power budget, especially in multi-channel or battery-powered designs. |
| Input Bias Current | 6 pA typ | 3.5 µA typ | Very low bias current (FET input) minimizes offset errors in high-impedance circuits; the AD8061's bipolar input draws far more. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package footprint and pinout affect drop-in compatibility; both use 8-lead SOIC but with different pin functions. |
| Output Current | 30 mA | 50 mA | Higher output drive capability supports lower-impedance loads and cable driving without additional buffering. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8066ARZ | AD8061AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 2 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 180V/µs | 650V/µs |
| -3 dB Bandwidth | 155 MHz | 320 MHz |
| Current - Input Bias | 3 pA | 3.5 µA |
| Voltage - Input Offset | 400 µV | 1 mV |
| Supply Current | 6.6mA (x2 Channels) | 6.8mA |
| Current - Output / Channel | 30 mA | 50 mA |
| Voltage - Supply Span(Min) | 5 V | 2.7 V |
| Voltage - Supply Span(Max) | 24 V | 8 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Series | FastFET™ | - |
Frequently asked questions
What are the key differences between the AD8066ARZ and AD8061AR?
The AD8066ARZ is a dual, high-performance, fast FET-input operational amplifier with a 145 MHz gain bandwidth product, 180 V/µs slew rate, and low input bias current, supplied in an 8-lead SOIC package. The AD8061AR is a single, low-cost, high-speed voltage-feedback operational amplifier with a 300 MHz gain bandwidth product and 650 V/µs slew rate, supplied in an 8-lead SOIC package. The AD8066ARZ integrates two amplifiers per package, while the AD8061AR contains one amplifier.
Can the AD8066ARZ and AD8061AR be used interchangeably in a design?
No. The AD8066ARZ is a dual op amp and the AD8061AR is a single op amp, so their pinouts and channel counts differ. The AD8066ARZ also specifies a 145 MHz gain bandwidth product versus 300 MHz for the AD8061AR, and different supply current, input bias current, and noise characteristics. A direct substitution is not possible without redesigning the circuit and validating all parameters against the manufacturer datasheets.
What are the supply voltage ranges for the AD8066ARZ and AD8061AR?
The AD8066ARZ operates from a dual supply of ±2.5 V to ±12 V (5 V to 24 V total). The AD8061AR operates from a single supply of 2.7 V to 12 V or a dual supply of ±1.35 V to ±6 V. Designs must ensure the chosen supply rail falls within the specified range for each device.
How do the bandwidth and slew rate of the AD8066ARZ compare with the AD8061AR?
The AD8066ARZ has a gain bandwidth product of 145 MHz and a slew rate of 180 V/µs. The AD8061AR has a gain bandwidth product of 300 MHz and a slew rate of 650 V/µs. The AD8061AR therefore offers higher small-signal bandwidth and faster large-signal response, while the AD8066ARZ provides two amplifiers in one package.
What are the input bias current and input offset voltage specifications for these amplifiers?
The AD8066ARZ is a FET-input amplifier with a typical input bias current of 6 pA and a typical input offset voltage of 0.5 mV (1.5 mV maximum). The AD8061AR is a voltage-feedback amplifier with a typical input bias current of 3.5 µA and a typical input offset voltage of 1 mV (6 mV maximum). The AD8066ARZ is preferable for high-impedance sensor interfaces where low bias current is critical.
What are the package and pin configuration differences between the AD8066ARZ and AD8061AR?
Both devices are offered in an 8-lead SOIC package (R-8 suffix). However, the AD8066ARZ is a dual amplifier with two independent op amps sharing supply and ground pins, while the AD8061AR is a single amplifier with a different pin assignment including a disable pin. PCB layouts must follow the specific pinout in each device's datasheet and cannot be shared without modification.
Which device is better suited for low-power or battery-operated applications?
The AD8061AR typically draws 7.5 mA of supply current per amplifier, while the AD8066ARZ typically draws 6.4 mA per amplifier (12.8 mA total for the dual). For a single-channel low-power design, the AD8061AR may be preferable, but the total system current must be evaluated. Both devices should be compared against the application's supply current budget using the datasheet maximum specifications.
Are the AD8066ARZ and AD8061AR specified for the same operating temperature range?
Both the AD8066ARZ and AD8061AR are specified for the industrial temperature range of −40°C to +85°C. Designers should verify the exact grade and temperature range on the manufacturer datasheet for the specific orderable part number before finalizing the design.