Part A
AD8022ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7448 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8021ARMZ and AD8022ARMZ share the same SOIC-8 package, dual-supply voltage range, and industrial temperature range, making them viable functional replacement candidates in many designs. However, the AD8021ARMZ is a single-channel voltage-feedback amplifier optimized for low noise and high speed, while the AD8022ARMZ is a dual-channel current-feedback amplifier with different gain-bandwidth and slew-rate characteristics. Designers must validate dynamic performance, channel count requirements, and feedback topology before substituting one for the other in a given application.
Package Type
High match
Supply Voltage Range
High match
Channel Count
Validation required
Amplifier Topology
Not compatible
Parts at a glance
Part B
AD8021ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2172 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8021ARMZ | AD8022ARMZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 2 | Channel count determines how many independent signal paths can be processed in one package; a dual amplifier can replace two singles, affecting board layout and cost. |
| -3 dB Bandwidth | 490 MHz | 100 MHz | Bandwidth sets the maximum signal frequency the amplifier can handle with acceptable gain; a large difference changes suitability for high-speed applications. |
| Slew Rate | 460 V/µs | 50 V/µs | Slew rate limits how fast the output can respond to large signal steps; higher slew rate supports faster large-signal and pulse applications. |
| Input Voltage Noise Density | 2.1 nV/√Hz | 4.5 nV/√Hz | Lower input voltage noise improves signal-to-noise ratio in low-level signal amplification; this affects precision and dynamic range. |
| Supply Current per Amplifier | 7.7 mA | 4 mA | Supply current drives power consumption and thermal budget; lower per-amplifier current is preferable for power-sensitive designs. |
| Input Offset Voltage (Max) | 1 mV | 1.5 mV | Offset voltage introduces DC error at the output; tighter offset improves accuracy in DC-coupled and precision signal chains. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Package footprint and pinout affect PCB layout compatibility; identical package type allows similar board space but pin functions must be verified. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range confirms suitability for industrial environments; matching ranges indicate comparable environmental robustness. |
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 | AD8022ARMZ | AD8021ARMZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 2 | 1 |
| Slew Rate | 50V/µs | 460V/µs |
| Gain Bandwidth Product | 100 MHz | - |
| -3 dB Bandwidth | 130 MHz | 560 MHz |
| Current - Input Bias | 2.5 µA | 7.5 µA |
| Voltage - Input Offset | 1.5 mV | 400 µV |
| Supply Current | 4mA | 7.8mA |
| Current - Output / Channel | 55 mA | 70 mA |
| Voltage - Supply Span(Min) | 4.5 V | 4.5 V |
| Voltage - Supply Span(Max) | 26 V | 24 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD8021ARMZ and AD8022ARMZ?
The AD8021ARMZ is a single high-speed, low-noise voltage feedback operational amplifier, while the AD8022ARMZ is a dual version of the same amplifier family. Both are offered in an 8-lead MSOP (ARMZ) package, but the AD8022ARMZ integrates two independent amplifiers in one package, making it suitable for dual-channel or differential signal chains where board space is critical.
Are the AD8021ARMZ and AD8022ARMZ pin-compatible in the same 8-lead MSOP package?
No. Although both devices use the 8-lead MSOP (ARMZ) package, the pinouts differ because the AD8021ARMZ is a single amplifier with dedicated null/disable and feedback pins, whereas the AD8022ARMZ is a dual amplifier that uses the eight pins for two complete amplifier channels. The PCB layout must be designed specifically for the chosen device.
What are the key AC specifications of the AD8021ARMZ?
The AD8021ARMZ offers a −3 dB bandwidth of 490 MHz (G = +1), a slew rate of 470 V/µs, and a settling time of 22 ns to 0.1%. It also features low input voltage noise of 2.1 nV/√Hz and low distortion, making it suitable for high-speed data acquisition and instrumentation front ends.
How do the supply voltage and quiescent current compare between the two devices?
Both the AD8021ARMZ and AD8022ARMZ operate from a wide supply range of ±2.5 V to ±12 V (5 V to 24 V total). The AD8021ARMZ typically draws about 7.7 mA of quiescent current for its single amplifier, while the AD8022ARMZ draws approximately 7.7 mA per amplifier (about 15.4 mA total for the dual), so the dual device consumes roughly twice the supply current when both channels are active.
Can the AD8022ARMZ be used as a drop-in replacement for two AD8021ARMZ devices?
Functionally, the AD8022ARMZ provides two amplifiers with comparable AC performance to the AD8021ARMZ, but it is not a pin-for-pin drop-in replacement. The dual device requires a new PCB layout that accounts for the different pinout, shared supply pins, and thermal considerations of two active channels in one package. Circuit-level performance should be validated against the AD8022ARMZ datasheet before substitution.
Which device is better suited for multi-channel or differential signal conditioning?
The AD8022ARMZ is generally better suited for multi-channel or differential signal conditioning because it integrates two matched amplifiers in a single 8-lead MSOP package, saving board space and simplifying layout symmetry. The AD8021ARMZ remains preferable for single-channel designs where only one amplifier is needed and minimal component count is desired.
Do both devices support the same operating temperature range and package type?
Yes. Both the AD8021ARMZ and AD8022ARMZ are specified over the industrial temperature range of −40 °C to +85 °C and are supplied in the 8-lead MSOP (ARMZ) package. The "Z" suffix indicates RoHS-compliant lead-free construction for both parts.