Part A
AD8065ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6652 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8065ARZ and AD8061AR-REEL7 are both single-channel, high-speed voltage-feedback operational amplifiers from Analog Devices in the same 8-lead SOIC package, sharing a broadly similar signal-chain role. However, they differ in supply voltage range, quiescent current, and bandwidth, so the AD8061AR-REEL7 can serve as a functional substitute only after validating the application's supply rail, power budget, and AC performance requirements against the AD8065ARZ specifications.
Package Type
High match
Channel Count
High match
Supply Voltage Range
Validation required
Bandwidth and Quiescent Current
Validation required
Parts at a glance
Part B
AD8061AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 961 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 | AD8065ARZ | AD8061AR-REEL7 | Why it matters |
|---|---|---|---|
| Amplifier Type | Voltage Feedback | Voltage Feedback | Both are voltage-feedback op amps, so the basic feedback topology and design equations are the same. |
| Number of Circuits | 1 | 1 | Single-channel devices; channel count must match the target circuit's signal path requirements. |
| -3dB Bandwidth | 145 MHz | 320 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle with acceptable gain roll-off. |
| Slew Rate | 180 V/µs | 650 V/µs | Slew rate limits large-signal high-frequency performance and affects distortion for fast transients. |
| Input Offset Voltage | 400 µV (max) | 6 mV (max) | Lower offset voltage improves DC accuracy, which is critical for precision and low-level signal applications. |
| Input Bias Current | 6 pA (typ) | 3.5 µA (typ) | Very low bias current reduces errors in high-impedance and precision circuits; the large difference affects source loading. |
| Supply Voltage Range | 5 V to 24 V | 2.7 V to 8 V | The supply range must cover the system rail voltages; these parts are not interchangeable across all supply levels. |
| Supply Current per Channel | 6.4 mA (typ) | 6.8 mA (typ) | Quiescent current affects power budget and thermal design in portable and dense systems. |
| Package / Mounting | 8-SOIC (Surface Mount) | 8-SOIC (Surface Mount) | Matching package and footprint allows drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range must cover the application environment for reliable operation. |
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 | AD8065ARZ | AD8061AR-REEL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 180V/µs | 650V/µs |
| -3 dB Bandwidth | 145 MHz | 320 MHz |
| Current - Input Bias | 3 pA | 3.5 µA |
| Voltage - Input Offset | 400 µV | 1 mV |
| Supply Current | 6.6mA | 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 AD8065ARZ and AD8061AR-REEL7?
The AD8065ARZ is a single, high-performance, fast FET-input operational amplifier in an 8-lead SOIC package, featuring a 145 MHz gain bandwidth product, 180 V/µs slew rate, and low input bias current. The AD8061AR-REEL7 is a single, low-cost, high-speed voltage feedback amplifier in an 8-lead SOIC package supplied on a 7-inch reel, with a 300 MHz gain bandwidth product and 650 V/µs slew rate. The AD8065ARZ is optimized for low noise and low input bias current, while the AD8061AR-REEL7 is optimized for low cost and high speed.
Can the AD8065ARZ and AD8061AR-REEL7 be used interchangeably in a design?
No, they are not direct substitutes. The AD8065ARZ has a 145 MHz gain bandwidth product, 180 V/µs slew rate, and low input bias current (typically 2 pA), while the AD8061AR-REEL7 has a 300 MHz gain bandwidth product, 650 V/µs slew rate, and higher input bias current. Supply voltage ranges, input common-mode voltage ranges, and noise characteristics also differ. A design must be revalidated against the respective datasheets before substitution.
What are the supply voltage ranges for the AD8065ARZ and AD8061AR-REEL7?
The AD8065ARZ operates from a single supply of 5 V to 24 V or a dual supply of ±2.5 V to ±12 V. The AD8061AR-REEL7 operates from a single supply of 2.7 V to 12 V or a dual supply of ±1.35 V to ±6 V. The AD8065ARZ therefore supports a wider and higher supply voltage range than the AD8061AR-REEL7.
How do the input bias current and input offset voltage compare between the two amplifiers?
The AD8065ARZ is a FET-input amplifier with a typical input bias current of 2 pA and a typical input offset voltage of 0.4 mV. The AD8061AR-REEL7 is a voltage feedback amplifier with a typical input bias current of 3.5 µA and a typical input offset voltage of 1 mV. The AD8065ARZ is therefore preferable for high-impedance sensor interfaces and precision DC applications.
What are the package and ordering differences between the AD8065ARZ and AD8061AR-REEL7?
Both devices are offered in an 8-lead SOIC package. The AD8065ARZ is supplied in tube or tray quantities as a standard ordering code, while the AD8061AR-REEL7 is supplied on a 7-inch tape-and-reel with 750 units per reel, making it suited to automated high-volume assembly. The package footprint and pinout are compatible, but electrical specifications differ.
Which device is better suited for low-noise, high-impedance signal conditioning?
The AD8065ARZ is better suited for low-noise, high-impedance signal conditioning. It provides a typical input bias current of 2 pA, a typical input voltage noise density of 7 nV/√Hz, and a typical input current noise density of 0.6 fA/√Hz. The AD8061AR-REEL7 has a typical input voltage noise density of 8.5 nV/√Hz and a much higher input bias current of 3.5 µA, which limits its use in high-impedance nodes.
Which device offers higher speed for video or high-frequency applications?
The AD8061AR-REEL7 offers higher speed, with a 300 MHz gain bandwidth product and a 650 V/µs slew rate, compared with the AD8065ARZ's 145 MHz gain bandwidth product and 180 V/µs slew rate. For applications prioritizing bandwidth and slew rate over low input bias current and low noise, the AD8061AR-REEL7 is the faster option.
Are the operating temperature ranges of the AD8065ARZ and AD8061AR-REEL7 the same?
Yes, both the AD8065ARZ and AD8061AR-REEL7 are specified for an operating temperature range of −40 °C to +85 °C. This allows either device to be used in industrial-temperature environments, provided the other electrical and package requirements are met.