Part A
AD620BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3666 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD620ARZ and AD620BRZ are functionally interchangeable instrumentation amplifiers sharing identical pinout, package, and gain configuration, with the BRZ grade offering tighter gain and offset specifications. The ARZ can serve as a direct drop-in substitute for the BRZ in most designs, provided the relaxed grade tolerances are acceptable for the target application.
Package Type
High match
Pin Configuration
High match
Gain Range
High match
Gain Error Tolerance
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 | AD620ARZ | AD620BRZ | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 125 µV | 50 µV | Lower offset voltage reduces DC error at the output, which is critical for precision instrumentation and low-level signal amplification. |
| Input Offset Voltage Drift (max) | 1.0 µV/°C | 0.6 µV/°C | Lower drift maintains accuracy over temperature, important for applications operating across wide temperature ranges without recalibration. |
| Input Bias Current (max) | 2.0 nA | 1.0 nA | Lower bias current reduces errors in high-impedance source applications such as sensor interfaces and bio-potential measurements. |
| Input Noise Voltage (1 kHz) | 9 nV/√Hz | 9 nV/√Hz | Noise density determines the minimum resolvable signal; both grades share the same typical noise, so noise performance is equivalent. |
| Gain Error (G=1000, max) | 0.15% | 0.15% | Gain accuracy affects overall signal scaling; identical gain error means both grades provide the same amplification precision. |
| CMRR (G=1000, min) | 100 dB | 110 dB | Higher common-mode rejection suppresses interference and ground noise, improving measurement integrity in noisy environments. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Both grades support the same industrial temperature range, so environmental compatibility is identical. |
| Supply Voltage Range | ±2.3 V to ±18 V | ±2.3 V to ±18 V | Identical supply range ensures both parts can be used in the same power architectures without redesign. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout allow direct drop-in substitution on an existing PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD620BRZ | AD620ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Slew Rate | 1.2V/µs | 1.2V/µs |
| -3 dB Bandwidth | 1 MHz | 1 MHz |
| Current - Input Bias | 500 pA | 500 pA |
| Voltage - Input Offset | 15 µV | 30 µV |
| Supply Current | 900µA | 900µA |
| Current - Output / Channel | 18 mA | 18 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 AD620ARZ and AD620BRZ?
The main difference is the grade specification. The AD620ARZ is the A-grade version, while the AD620BRZ is the higher-grade B version. The B-grade offers tighter guaranteed specifications, most notably a lower maximum input offset voltage and lower input offset voltage drift, as defined in the Analog Devices AD620 datasheet.
Are the AD620ARZ and AD620BRZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package (RZ suffix) with identical pin functions, so they are pin-to-pin and footprint compatible. Either grade can be placed on the same PCB land pattern.
How do the input offset voltage specifications compare between the two grades?
Per the Analog Devices AD620 datasheet, the A-grade (AD620ARZ) guarantees a maximum input offset voltage of 125 µV, while the B-grade (AD620BRZ) guarantees a maximum input offset voltage of 50 µV. The B-grade therefore provides tighter offset accuracy.
How does input offset voltage drift differ between the AD620ARZ and AD620BRZ?
The AD620ARZ (A-grade) is specified with a maximum input offset voltage drift of 1.0 µV/°C, whereas the AD620BRZ (B-grade) is specified at a maximum of 0.6 µV/°C, according to the Analog Devices AD620 datasheet. The B-grade offers better drift stability over temperature.
Do the AD620ARZ and AD620BRZ share the same gain and bandwidth characteristics?
Yes. Both grades use the same internal architecture and are programmed for gain with a single external resistor (G = 1 + 49.4 kΩ/RG). Both are specified for gains from 1 to 10,000 and a bandwidth of 120 kHz at G = 100, as stated in the Analog Devices AD620 datasheet.
Can the AD620ARZ be used as a drop-in replacement for the AD620BRZ, or vice versa?
Because both are pin-compatible 8-lead SOIC devices with the same functional specifications, they can be interchanged on the same board. However, substituting the A-grade for the B-grade may reduce guaranteed offset and drift margins, so the design's error budget must be validated against the AD620 datasheet limits before substitution.
Do both grades share the same supply voltage and operating temperature range?
Yes. Both the AD620ARZ and AD620BRZ operate from dual supplies of ±2.3 V to ±18 V and are specified over the industrial temperature range of −40°C to +85°C, per the Analog Devices AD620 datasheet.