Part A
AD623ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4377 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD623BRZ-R7 and AD623ARZ are functionally interchangeable instrumentation amplifiers sharing the same pinout, supply range, and gain configuration, with the BRZ grade offering tighter offset voltage and gain error tolerances for higher-precision applications. Designers can substitute the ARZ for the BRZ-R7 where grade-level precision is not critical, while the BRZ-R7 remains the preferred choice for error-sensitive signal chains.
Package Type
High match
Pin Configuration
High match
Supply Voltage Range
High match
Grade-Level Accuracy
Validation required
Parts at a glance
Part B
AD623BRZ-R7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5122 PCS
- Package
- SOIC-8
- 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 | AD623BRZ-R7 | AD623ARZ | Why it matters |
|---|---|---|---|
| Grade / Temperature Range | B grade, -40°C to +85°C | A grade, -40°C to +85°C | The B grade is a higher-precision bin than the A grade, so offset and gain error specifications differ even though the operating temperature range is the same. |
| Input Offset Voltage (max) | 200 µV | 500 µV | Lower offset voltage improves DC accuracy, which is critical in low-level sensor and bridge measurement applications. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 5 µV/°C | Lower drift maintains accuracy over temperature, reducing the need for recalibration in precision instrumentation. |
| Input Bias Current (max) | 25 nA | 27 nA | Bias current affects error when driven from high-impedance sources; the B grade offers a slightly tighter limit. |
| Gain Error (max) | 0.10% | 0.35% | Gain error directly impacts the accuracy of the amplified signal; the B grade provides tighter gain accuracy. |
| Gain Nonlinearity (max) | 50 ppm | 100 ppm | Better nonlinearity means the output stays proportional to input across the full range, important for high-resolution measurement. |
| CMRR (min, G=10) | 90 dB | 80 dB | Higher common-mode rejection suppresses noise and interference, improving signal integrity in noisy environments. |
| Noise (RTI, 1 kHz) | 35 nV/√Hz | 35 nV/√Hz | Input-referred noise sets the minimum detectable signal; both grades share the same typical noise performance. |
| Supply Voltage Range | 2.7 V to 12 V (single), ±2.7 V to ±6 V (dual) | 2.7 V to 12 V (single), ±2.7 V to ±6 V (dual) | Identical supply flexibility allows either part to operate in the same single- or dual-supply systems. |
| Package | 8-Lead SOIC (R-8), tape and reel | 8-Lead SOIC (R-8), tube | Same package footprint enables drop-in substitution; packaging format differs for assembly handling. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD623ARZ | AD623BRZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.3V/µs | 0.3V/µs |
| -3 dB Bandwidth | 800 kHz | 800 kHz |
| Current - Input Bias | 17 nA | 17 nA |
| Voltage - Input Offset | 25 µV | 25 µV |
| Supply Current | 375µA | 375µA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 12 V | 12 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the AD623BRZ-R7 and the AD623ARZ?
Both are AD623 instrumentation amplifiers in an 8-lead SOIC package. The primary difference is the grade: the AD623BRZ-R7 is a B-grade device with tighter specifications, while the AD623ARZ is an A-grade device. The B-grade offers lower offset voltage, lower offset drift, lower gain error, and higher CMRR than the A-grade. The "-R7" suffix indicates tape-and-reel packaging.
What is the specified gain range for these AD623 devices?
The AD623 is a single-supply instrumentation amplifier whose gain is set by a single external resistor, with a gain range of 1 to 1000. Gain is programmed via the RG pins using the standard formula G = 1 + (100 kΩ / RG).
How do the offset voltage specifications compare between the B-grade and A-grade?
The AD623B grade has a lower maximum input offset voltage than the AD623A grade. Per the manufacturer datasheet, the B grade is specified at 200 µV maximum offset voltage, while the A grade is specified at 500 µV maximum. The B grade also has tighter offset voltage drift.
Do both parts operate from a single supply, and what is the supply voltage range?
Yes, both the AD623BRZ-R7 and AD623ARZ are designed for single-supply operation and also work with dual supplies. The specified supply voltage range is 2.7 V to 12 V for single-supply operation (or ±2.7 V to ±6 V for dual supplies).
Are the AD623BRZ-R7 and AD623ARZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, so they are pin-compatible and share the same PCB land pattern. The difference is the performance grade, not the package or pinout.
Can the AD623ARZ be used as a drop-in replacement for the AD623BRZ-R7?
They are pin-compatible, but the A grade has looser specifications than the B grade. A substitution is acceptable only if the design's error budget tolerates the A-grade offset voltage, offset drift, gain error, and CMRR limits. The B grade should be retained where tighter accuracy is required.
What is the difference in packaging between the AD623BRZ-R7 and AD623ARZ?
The AD623BRZ-R7 is supplied in tape-and-reel format (the "-R7" suffix denotes 7-inch reel packaging), which suits automated pick-and-place assembly. The AD623ARZ is supplied in standard tube packaging. Both use the same 8-lead SOIC body.
What is the specified CMRR for these two grades?
The AD623B grade specifies a higher minimum common-mode rejection ratio than the A grade. Per the manufacturer datasheet, the B grade achieves 90 dB minimum CMRR at G = 10, while the A grade is specified at 84 dB minimum at G = 10.