Part A
AD8422ARZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3192 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8422BRZ and AD8422ARZ-R7 share the same core instrumentation amplifier architecture, pinout, and supply range, making them functionally interchangeable in most designs. The BRZ grade offers tighter gain error and offset voltage specifications, while the ARZ-R7 is supplied in tape-and-reel packaging for automated assembly. Designers should confirm grade-dependent precision requirements and packaging format before substituting one for the other in production.
Package Type
High match
Pin Configuration
High match
Gain Error Grade
Validation required
Packaging Format
Validation required
Parts at a glance
Part B
AD8422BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3871 Stückzahl
- Package
- SOIC-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 | AD8422BRZ | AD8422ARZ-R7 | Why it matters |
|---|---|---|---|
| Grade / Temperature Range | B grade, -40°C to +85°C | A grade, -40°C to +85°C | Grade determines guaranteed specifications; B grade offers tighter limits than A grade, affecting precision-critical designs. |
| Input Offset Voltage (max) | ±60 µV | ±150 µV | Lower offset voltage improves DC accuracy, especially important for low-level signal amplification. |
| Input Offset Voltage Drift (max) | 0.5 µV/°C | 1.0 µV/°C | Lower drift maintains accuracy over temperature, critical for precision instrumentation applications. |
| Input Bias Current (max) | 1.0 nA | 1.5 nA | Lower bias current reduces errors in high-impedance source applications. |
| Common-Mode Rejection Ratio (min, G=1) | 94 dB | 86 dB | Higher CMRR rejects common-mode noise and interference, improving signal integrity in noisy environments. |
| Gain Error (max, G=1) | 0.02% | 0.03% | Lower gain error improves overall measurement accuracy and system calibration. |
| Input Voltage Noise (1 kHz, max) | 8 nV/√Hz | 8 nV/√Hz | Low noise preserves signal fidelity for small-signal amplification; both grades share similar noise performance. |
| Bandwidth (G=1, -3 dB) | 2.2 MHz | 2.2 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle without significant attenuation. |
| Supply Voltage Range | ±2.3 V to ±18 V (4.6 V to 36 V) | ±2.3 V to ±18 V (4.6 V to 36 V) | Wide supply range enables use in both battery-powered and industrial systems. |
| Package / Packaging | 8-Lead SOIC (tube) | 8-Lead SOIC (tape and reel, 7-inch) | Packaging format affects assembly line compatibility and inventory handling; both share the same SOIC footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8422ARZ-R7 | AD8422BRZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.8V/µs | 0.8V/µs |
| -3 dB Bandwidth | 2.2 MHz | 2.2 MHz |
| Current - Input Bias | 500 pA | 200 pA |
| Voltage - Input Offset | 60 µV | 25 µV |
| Supply Current | 300µA | 300µA |
| Current - Output / Channel | 20 mA | 20 mA |
| Voltage - Supply Span(Min) | 4.6 V | 4.6 V |
| Voltage - Supply Span(Max) | 36 V | 36 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 AD8422BRZ and the AD8422ARZ-R7?
Both parts are instrumentation amplifiers from the AD8422 family in an 8-lead SOIC package. The AD8422BRZ is supplied in a tube (bulk) packaging format and is specified with tighter grade tolerances, while the AD8422ARZ-R7 is supplied in a 7-inch tape-and-reel format for automated assembly. The B-grade offers better DC accuracy specifications than the A-grade, so the two differ in both performance grade and packaging.
Do the AD8422BRZ and AD8422ARZ-R7 have the same pinout and package?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with an identical pin configuration, so they are footprint-compatible on the PCB. The difference is the performance grade and the delivery format (tube vs. tape-and-reel), not the package or pin assignment.
Can the AD8422ARZ-R7 be used as a drop-in replacement for the AD8422BRZ?
Because the package and pinout are identical, the ARZ-R7 is physically interchangeable. However, the A-grade has wider guaranteed tolerances than the B-grade, so a design that relies on B-grade accuracy limits should be re-validated against the A-grade datasheet specifications before substituting. Substitution should only be done after confirming the target design's error budget is met by the A-grade limits.
What is the difference in gain error specification between the B-grade and A-grade?
The AD8422B grade is specified with a maximum gain error of 0.04% (G = 1), while the AD8422A grade is specified with a maximum gain error of 0.1% (G = 1). Designs requiring tighter gain accuracy should use the B grade.
How do the input offset voltage specifications compare between the two grades?
The AD8422B grade has a maximum input offset voltage of 60 µV, whereas the AD8422A grade has a maximum input offset voltage of 150 µV. The B grade therefore provides roughly 2.5× tighter offset voltage limit than the A grade.
Why would a designer choose the AD8422ARZ-R7 over the AD8422BRZ?
The AD8422ARZ-R7 is supplied in 7-inch tape-and-reel, which suits high-volume automated pick-and-place assembly, and the A grade is a lower-cost accuracy tier. It is appropriate when the application's error budget can tolerate the wider A-grade offset and gain error limits and reel packaging is preferred for production.
Are the AD8422BRZ and AD8422ARZ-R7 specified over the same temperature range?
Yes. Both the B grade and A grade of the AD8422 are specified over the industrial temperature range of −40°C to +85°C, so the operating temperature window is identical between the two orderable parts.
Do both parts share the same supply voltage and gain range capabilities?
Yes. Both grades operate from a single supply of 4.5 V to 36 V or a dual supply of ±2.25 V to ±18 V, and both use a single external resistor to set gain from 1 to 1000. The supply range and gain-setting architecture are common to the AD8422 family; only the guaranteed accuracy grades and packaging differ.