Part A
AD8028ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5537 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8028ARZ and AD8022AR are both dual high-speed voltage-feedback operational amplifiers in SOIC-8 packages, making the AD8028ARZ a viable functional replacement candidate for the AD8022AR in many designs. However, the AD8028ARZ offers wider bandwidth, higher slew rate, and lower input bias current, while the AD8022AR provides lower input voltage noise and lower quiescent current. Designers should validate supply voltage headroom, capacitive load stability, and noise-sensitive applications before substituting.
Amplifier Channel Count
High match
Package Type
High match
Bandwidth and Slew Rate
Validation required
Input Noise and Supply Current
Validation required
Parts at a glance
Part B
AD8022AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9474 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 | AD8028ARZ | AD8022AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is compatible for drop-in use in dual-channel designs. |
| Gain Bandwidth Product | 190 MHz | 100 MHz | Higher GBW allows greater closed-loop bandwidth and faster settling; the AD8028 offers roughly double the bandwidth. |
| Slew Rate | 100 V/µs | 50 V/µs | Slew rate limits large-signal response; the AD8028 slews twice as fast, affecting high-frequency large-signal fidelity. |
| Input Voltage Noise Density | 4.3 nV/√Hz | 2.5 nV/√Hz | Lower noise improves SNR in low-level signal applications; the AD8022 is notably quieter. |
| Supply Voltage Range | 2.7 V to 12 V | 4.5 V to 12 V | The AD8028 operates at lower supply voltages, enabling use in 3 V systems where the AD8022 cannot run. |
| Input Offset Voltage (Max) | 1 mV | 1.5 mV | Lower offset reduces DC error; the AD8028 provides tighter offset accuracy for precision DC applications. |
| Quiescent Supply Current per Amplifier | 1.4 mA | 4 mA | Lower quiescent current reduces power consumption; the AD8028 is significantly more power-efficient. |
| Output Current | 45 mA | 35 mA | Higher output drive supports heavier loads; the AD8028 can drive lower-impedance loads more effectively. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout allow direct PCB substitution without layout changes. |
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 | AD8028ARZ | AD8022AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | General Purpose | Voltage Feedback |
| Number of Circuits | 2 | 2 |
| Slew Rate | 100V/µs | 50V/µs |
| Gain Bandwidth Product | - | 100 MHz |
| -3 dB Bandwidth | 190 MHz | 130 MHz |
| Current - Input Bias | 4 µA | 2.5 µA |
| Voltage - Input Offset | 200 µV | 1.5 mV |
| Supply Current | 6.5mA (x2 Channels) | 4mA |
| Current - Output / Channel | 120 mA | 55 mA |
| Voltage - Supply Span(Min) | 2.7 V | 4.5 V |
| Voltage - Supply Span(Max) | 12 V | 26 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | Rail-to-Rail | - |
Frequently asked questions
What are the primary differences between the AD8028ARZ and the AD8022AR?
The AD8028ARZ is a dual, low-noise, high-speed voltage feedback operational amplifier specified for operation from 3 V to 12 V supplies, featuring rail-to-rail output and a typical −3 dB bandwidth of 190 MHz at G = +1. The AD8022AR is a dual, low-noise, high-speed voltage feedback amplifier specified for ±5 V to ±12 V (10 V to 24 V) supplies with a typical −3 dB bandwidth of 130 MHz at G = +1. The AD8028ARZ supports lower single-supply operation and rail-to-rail output, while the AD8022AR is characterized for higher dual-supply operation with a wider supply range.
Are the AD8028ARZ and AD8022AR pin-compatible in the SOIC-8 package?
Both devices are offered in an 8-lead SOIC package with the standard dual op-amp pinout: pin 1 = OUT A, pin 2 = −IN A, pin 3 = +IN A, pin 4 = V−, pin 5 = +IN B, pin 6 = −IN B, pin 7 = OUT B, and pin 8 = V+. Because the pin functions and package footprint match, the AD8028ARZ and AD8022AR are pin-compatible in the SOIC-8 package, but electrical differences must still be validated for the target design.
Can the AD8028ARZ be used as a drop-in replacement for the AD8022AR?
Not unconditionally. Although both are dual high-speed voltage feedback amplifiers in an 8-lead SOIC package, the AD8028ARZ is specified for 3 V to 12 V supplies with rail-to-rail output, whereas the AD8022AR is specified for ±5 V to ±12 V supplies. Supply voltage range, output swing, bandwidth, and input common-mode range differ, so a direct substitution requires verification against the AD8028ARZ datasheet for the specific circuit conditions.
How do the supply voltage requirements of the AD8028ARZ and AD8022AR compare?
The AD8028ARZ operates from a single supply of 3 V to 12 V (or equivalent dual supplies), making it suitable for low-voltage single-supply systems. The AD8022AR is specified for dual supplies of ±5 V to ±12 V (10 V to 24 V total). Designs powered from a single 5 V rail can use the AD8028ARZ but not the AD8022AR within its specified range.
How do the bandwidth and slew rate of the AD8028ARZ and AD8022AR compare?
The AD8028ARZ provides a typical −3 dB bandwidth of 190 MHz at G = +1 and a slew rate of approximately 100 V/µs. The AD8022AR provides a typical −3 dB bandwidth of 130 MHz at G = +1 and a slew rate of approximately 50 V/µs. The AD8028ARZ therefore offers higher small-signal bandwidth and faster slew rate, which can benefit high-speed signal chains.
What are the input voltage noise characteristics of the AD8028ARZ and AD8022AR?
Both devices are low-noise bipolar-input amplifiers. The AD8028ARZ has a typical input voltage noise density of 4.5 nV/√Hz at 1 kHz, and the AD8022AR has a typical input voltage noise density of 2.7 nV/√Hz at 1 kHz. The AD8022AR offers lower voltage noise, which may be preferable in low-noise preamplifier stages.
Do the AD8028ARZ and AD8022AR support rail-to-rail output swing?
The AD8028ARZ features rail-to-rail output, allowing the output to swing close to both supply rails, which is advantageous in low-voltage single-supply designs. The AD8022AR does not specify rail-to-rail output; its output swing is limited relative to the supply rails per its datasheet. Designs requiring maximum dynamic range near the rails should account for this difference.
Which applications are better suited to the AD8028ARZ versus the AD8022AR?
The AD8028ARZ is well suited to low-voltage, single-supply systems such as portable instrumentation, active filters, and ADC drivers where rail-to-rail output and 3 V operation are beneficial. The AD8022AR is suited to dual-supply systems such as professional video, imaging, and high-speed signal processing where its lower voltage noise and ±5 V to ±12 V supply range are advantageous. Selection should be based on verified datasheet parameters for the target circuit.