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 is a viable functional replacement candidate for the AD8022ARZ in many low-voltage, high-speed signal-conditioning designs, as both share the same SOIC-8 footprint, dual-channel topology, and comparable bandwidth. However, the AD8028ARZ operates on a lower supply range and draws different quiescent current, so the replacement must be validated against the target board's supply rail, thermal budget, and output drive requirements before production release.
Package Type
High match
Channel Count
High match
Supply Voltage Range
Validation required
Quiescent Current
Validation required
Parts at a glance
Part B
AD8022ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5879 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 | AD8022ARZ | AD8028ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is compatible for dual-channel signal chains. |
| Gain Bandwidth Product | 100 MHz | 190 MHz | Higher GBW allows the AD8028 to handle wider-bandwidth signals and faster settling in high-speed applications. |
| Slew Rate | 100 V/µs | 100 V/µs | Slew rate determines how fast the output can respond to large signal steps; identical here, so large-signal transient behavior is comparable. |
| Input Voltage Noise Density | 2.7 nV/√Hz | 4.5 nV/√Hz | Lower input noise improves SNR in low-level signal amplification; the AD8022 is better suited for noise-sensitive front ends. |
| Supply Voltage Range | ±2.5 V to ±12 V | 2.7 V to 12 V (single) / ±1.35 V to ±6 V (dual) | The AD8028 supports lower supply voltages, enabling use in low-voltage single-supply systems where the AD8022 cannot operate. |
| Input Bias Current | 4 µA | 1 µA | Lower bias current reduces DC offset errors in high-impedance circuits; the AD8028 is preferable for high-source-impedance designs. |
| Input Offset Voltage | 1.5 mV | 0.5 mV | Lower offset voltage improves DC accuracy; the AD8028 offers better precision for DC-coupled signal paths. |
| Quiescent Supply Current (per amplifier) | 4 mA | 1.3 mA | Lower quiescent current reduces power consumption; the AD8028 is better for power-sensitive or battery-powered designs. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout allow drop-in board replacement 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 | AD8022ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | General Purpose | Voltage Feedback |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | - |
| Slew Rate | 100V/µs | 50V/µs |
| -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 |
| Gain Bandwidth Product | - | 100 MHz |
Frequently asked questions
What are the primary differences between the AD8022ARZ and AD8028ARZ?
The AD8022ARZ is a dual, low-noise, high-speed voltage feedback operational amplifier, while the AD8028ARZ is a dual, low-distortion, high-speed operational amplifier with rail-to-rail output. The AD8022ARZ is optimized for low input voltage noise (approximately 2.7 nV/√Hz) and is typically used in applications such as active filters and preamplifiers. The AD8028ARZ features rail-to-rail output swing and is specified for low harmonic distortion, making it suitable for driving ADCs and other demanding signal-chain applications. They differ in input noise, output swing capability, and distortion performance, so they are not direct drop-in replacements without design validation.
Are the AD8022ARZ and AD8028ARZ pin-compatible?
Both devices are offered in an 8-lead SOIC package (the ARZ suffix denotes SOIC). However, pin compatibility alone does not guarantee interchangeability. The electrical specifications, output swing, and distortion characteristics differ between the two devices, so a direct substitution requires verification against the respective datasheets and the target application requirements.
Which device offers lower input voltage noise, the AD8022ARZ or the AD8028ARZ?
The AD8022ARZ is specified with a low input voltage noise density of approximately 2.7 nV/√Hz, which is lower than that of the AD8028ARZ. The AD8022ARZ is therefore better suited for low-noise preamplifier and filter stages where input-referred noise is critical.
Does the AD8028ARZ have rail-to-rail output, and does the AD8022ARZ?
The AD8028ARZ features rail-to-rail output swing, allowing the output to approach both supply rails, which is advantageous for maximizing dynamic range in ADC driver and signal-conditioning applications. The AD8022ARZ does not have rail-to-rail output; its output swing is limited relative to the supply rails. This is a key differentiator when selecting between the two parts.
Which device is better suited for driving analog-to-digital converters (ADCs)?
The AD8028ARZ is generally better suited for ADC driving applications because of its rail-to-rail output and low harmonic distortion specifications, which help preserve signal integrity and maximize the ADC's input dynamic range. The AD8022ARZ, with its lower input voltage noise, is more often selected for low-noise preamplifier and active filter stages. Selection should be confirmed against the specific ADC requirements and the datasheets.
What are the supply voltage and package options for these devices?
Both the AD8022ARZ and AD8028ARZ are dual operational amplifiers offered in an 8-lead SOIC package (indicated by the ARZ suffix). Both are designed to operate from dual supplies typical of high-speed analog signal chains. For exact supply voltage ranges, quiescent current, and absolute maximum ratings, refer to the respective manufacturer datasheets, as these parameters must be verified before design use.
Can the AD8022ARZ be used as a direct replacement for the AD8028ARZ in an existing design?
No, they should not be treated as direct drop-in replacements without validation. Although both are dual op amps in 8-lead SOIC packages, they differ in output swing (rail-to-rail vs. non-rail-to-rail), input noise, and distortion performance. A substitution requires reviewing the circuit's gain, output swing, distortion, and noise requirements against both datasheets and performing bench verification.