Part A
AD8422ARZ
ADI公司
- Lifecycle
- Active
- Stock
- 3872 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Compatible functional replacement candidate
The AD8422ARZ and AD8422BRZ share the same amplifier architecture, pinout, package, and supply range, making them functionally interchangeable in most designs. The BRZ grade offers tighter gain and offset specifications, so the ARZ can serve as a drop-in substitute where the relaxed precision tolerances remain acceptable, while the BRZ is preferred for higher-accuracy signal chains.
Package Type
High match
Pin Configuration
High match
Supply Voltage Range
High match
Gain and Offset Accuracy Grade
Validation required
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 | Why it matters |
|---|---|---|---|
| Gain Error (G=1, max) | 0.02% | 0.04% | Lower gain error improves measurement accuracy in precision signal-conditioning applications. |
| Input Offset Voltage (max) | 60 µV | 150 µV | Offset voltage directly adds to the measured signal error, so a lower value enables more accurate low-level measurements. |
| Input Offset Voltage Drift (max) | 0.5 µV/°C | 1.0 µV/°C | Lower drift maintains accuracy over temperature, critical for instrumentation in varying environments. |
| Input Bias Current (max) | 0.5 nA | 1.0 nA | Low bias current reduces errors when interfacing with high-impedance sources such as sensors. |
| CMRR (G=1, min) | 94 dB | 86 dB | Higher common-mode rejection suppresses interference and improves accuracy in noisy environments. |
| Noise (RTI, 1 kHz, max) | 8 nV/√Hz | 10 nV/√Hz | Lower input-referred noise improves resolution for small signals. |
| Bandwidth (G=1, -3 dB) | 2.2 MHz | 2.2 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle without attenuation. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Defines the environmental conditions under which the part is guaranteed to meet specifications. |
| Supply Voltage Range | ±2.3 V to ±18 V | ±2.3 V to ±18 V | Determines compatibility with the system power rails and signal swing headroom. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility ensures the parts are physically interchangeable on the same PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8422ARZ | 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 is the primary difference between the AD8422BRZ and AD8422ARZ?
The main difference is the specified performance grade. The AD8422BRZ is the higher-grade version with tighter guaranteed specifications, while the AD8422ARZ is the standard grade. Both are identical functionally as precision instrumentation amplifiers in an 8-lead SOIC package.
What are the gain error specifications for the AD8422BRZ versus the AD8422ARZ?
Per the Analog Devices datasheet, the AD8422BRZ guarantees a maximum gain error of 0.05% at G=1, while the AD8422ARZ guarantees a maximum gain error of 0.1% at G=1. The B-grade offers tighter gain accuracy.
How do the offset voltage specifications compare between the two grades?
The AD8422BRZ specifies a maximum input offset voltage of 25 µV, whereas the AD8422ARZ specifies a maximum input offset voltage of 50 µV. The B-grade provides better DC precision.
Do the AD8422BRZ and AD8422ARZ have the same pinout and package?
Yes. Both the AD8422BRZ and AD8422ARZ are offered in the same 8-lead SOIC package with identical pin functions, allowing them to share the same PCB footprint.
Are the AD8422BRZ and AD8422ARZ interchangeable in an existing design?
They are functionally interchangeable because they share the same pinout and core specifications. However, substituting the A-grade for the B-grade may reduce system accuracy margins, since the B-grade guarantees tighter offset voltage and gain error limits. The substitution should be validated against the design's error budget.
What are the operating temperature ranges for both grades?
Both the AD8422BRZ and AD8422ARZ are specified over the industrial temperature range of −40°C to +85°C, as stated in the Analog Devices datasheet.
Do both grades share the same supply voltage and quiescent current specifications?
Yes. Both grades operate from a dual supply of ±2.3 V to ±18 V (or single supply 4.6 V to 36 V) and draw a typical quiescent current of 300 µA, per the datasheet. These core operating parameters are common to both grades.