Part A
AD8022ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5879 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8022ARZ and AD8021AR are both high-speed voltage-feedback operational amplifiers from Analog Devices in the same 8-lead SOIC package, sharing a broadly similar signal-conditioning role. However, the AD8022ARZ is a dual-channel device with lower quiescent current per amplifier, while the AD8021AR is a single-channel device with higher bandwidth and a different supply and compensation profile. The AD8021AR can serve as a functional substitute only where a single amplifier is sufficient and the board is redesigned accordingly; it is not a pin-for-pin or channel-for-channel drop-in replacement for the dual AD8022ARZ.
Channel Count
Validation required
Bandwidth
Validation required
Package Type
High match
Supply Voltage Range
Validation required
Parts at a glance
Part B
AD8021AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7274 Stückzahl
- Series
- Linear - Amplifiers - Instrumentation, 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 | AD8021AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines whether one package can serve two signal paths; a dual cannot directly replace a single in a single-channel layout without layout changes. |
| -3 dB Bandwidth | 100 MHz (G = +1) | 490 MHz (G = +1) | Bandwidth sets the maximum signal frequency the amplifier can handle with acceptable gain, affecting high-speed signal fidelity. |
| Slew Rate | 100 V/µs | 470 V/µs | Slew rate limits how fast the output can track large signal transitions; lower slew rate causes distortion on fast, large-amplitude signals. |
| Input Voltage Noise | 2.7 nV/√Hz | 2.1 nV/√Hz | Lower input voltage noise improves the signal-to-noise ratio in low-level signal amplification applications. |
| Supply Voltage Range | ±2.5 V to ±12 V (5 V to 24 V) | ±2.5 V to ±12 V (5 V to 24 V) | The supply range must match the system rails; both support similar rails, allowing comparable power supply design. |
| Quiescent Supply Current (per amplifier) | 4 mA typ | 7.7 mA typ | Quiescent current affects power budget and thermal load; the lower-current part is preferable in power-sensitive designs. |
| Input Offset Voltage | 1.5 mV max | 1 mV max | Offset voltage introduces DC error at the output; tighter offset improves precision in DC-coupled signal chains. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility determines whether the part can be dropped into the same PCB footprint without redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment to ensure reliable operation and specified performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8022ARZ | AD8021AR |
|---|---|---|
| Part Status | Active | Obsolete |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 2 | 1 |
| Slew Rate | 50V/µs | 460V/µs |
| 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 |
| Voltage - Supply Span (Max) | - | 24 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | AD8021 |
| -3 dB Bandwidth | 130 MHz | 560 MHz |
| Gain Bandwidth Product | 100 MHz | - |
| Voltage - Supply Span(Min) | 4.5 V | - |
| Voltage - Supply Span(Max) | 26 V | - |
Frequently asked questions
What are the primary differences between the AD8022ARZ and the AD8021AR?
The AD8022ARZ is a dual, low-noise, high-speed voltage feedback operational amplifier, while the AD8021AR is a single, low-noise, high-speed voltage feedback operational amplifier. The AD8022ARZ integrates two amplifiers in one 8-lead SOIC package, whereas the AD8021AR contains one amplifier in an 8-lead SOIC package. Both are fabricated on Analog Devices' proprietary high-speed complementary bipolar process and are pin-compatible only in the sense that the AD8021AR occupies one amplifier site; the AD8022ARZ requires a dual-amplifier PCB layout.
Are the AD8022ARZ and AD8021AR pin-compatible?
No. The AD8022ARZ is a dual op amp in an 8-lead SOIC with both amplifiers' inputs and outputs assigned to the eight pins, while the AD8021AR is a single op amp in an 8-lead SOIC with a different pin function assignment, including dedicated null and disable pins. A board designed for the AD8021AR cannot directly accept the AD8022ARZ without layout changes, and vice versa.
How do the bandwidth and slew rate specifications compare?
Both devices are high-speed voltage feedback amplifiers with similar AC performance. The AD8021AR offers a -3 dB bandwidth of approximately 490 MHz (G = +1) and a slew rate of about 460 V/µs. The AD8022ARZ offers a -3 dB bandwidth of approximately 100 MHz (G = +1) and a slew rate of about 120 V/µs per amplifier. The AD8021AR is therefore the faster single-channel device, while the AD8022ARZ trades some speed for dual-channel integration.
What are the input voltage noise characteristics of each device?
The AD8021AR has an input voltage noise density of approximately 2.1 nV/√Hz at 10 kHz, making it one of the lowest-noise high-speed amplifiers in its class. The AD8022ARZ has an input voltage noise density of approximately 2.7 nV/√Hz at 10 kHz per amplifier. Both are suitable for low-noise signal conditioning, but the AD8021AR provides slightly lower noise for a single-channel design.
What are the supply voltage and quiescent current requirements?
Both devices operate from dual supplies typically ranging from ±5 V to ±12 V. The AD8021AR draws a typical quiescent supply current of approximately 7.7 mA per amplifier. The AD8022ARZ draws a typical quiescent supply current of approximately 7.5 mA per amplifier, or about 15 mA total for the dual device. Designers should account for the total dual-channel current when comparing power budgets.
Can the AD8022ARZ be used as a drop-in replacement for two AD8021AR devices?
Not as a direct drop-in replacement. Although the AD8022ARZ provides two amplifiers functionally similar to the AD8021AR, the pinout, package footprint, and PCB layout differ. Replacing two AD8021AR single amplifiers with one AD8022ARZ requires a new PCB layout that routes both amplifier channels to the correct pins, and the designer must verify that the AD8022ARZ's slightly lower bandwidth and slew rate meet the application requirements.
Which device is better suited for low-noise, high-speed signal chains?
For a single-channel low-noise, high-speed signal chain, the AD8021AR is generally preferred because it offers lower input voltage noise (approximately 2.1 nV/√Hz) and higher bandwidth (approximately 490 MHz) and slew rate (approximately 460 V/µs). For dual-channel designs where board space and channel matching are critical, the AD8022ARZ provides two well-matched low-noise amplifiers in a single package, provided its approximately 100 MHz bandwidth and 120 V/µs slew rate satisfy the signal chain requirements.
What package and temperature range options are available for these devices?
Both the AD8022ARZ and AD8021AR are offered in 8-lead SOIC packages. The AD8022ARZ is specified over the industrial temperature range of -40°C to +85°C. The AD8021AR is also specified over the industrial temperature range of -40°C to +85°C. Designers should confirm the exact orderable part number and temperature grade against the respective Analog Devices datasheets before finalizing a design.