Part A
AD623ARZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5853 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD623ARZ-R7 and AD623BRZ-RL are functionally interchangeable instrumentation amplifiers sharing the same pinout, package, supply range, and gain configuration, with the BRZ grade offering tighter factory-trimmed offset voltage and gain error for higher-precision applications. Designers can substitute either part without layout changes, selecting the B grade where improved DC accuracy is required.
Package and Pinout
High match
Supply Voltage Range
High match
Gain Configuration
High match
Input Offset Voltage Grade
Validation required
Parts at a glance
Part B
AD623BRZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7257 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, 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 | AD623ARZ-R7 | AD623BRZ-RL | Why it matters |
|---|---|---|---|
| Grade / Accuracy Class | A grade | B grade | The B grade offers tighter guaranteed specifications (offset, gain error, CMRR), so it can be a functional upgrade but not a drop-in equivalent where A-grade tolerances were designed in. |
| Input Offset Voltage (max) | 200 µV | 100 µV | Lower offset reduces DC error at the output, which matters for precision low-level signal amplification. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 1 µV/°C | Drift determines offset stability over temperature; the B grade holds calibration better across the operating range. |
| Gain Error (max) | 0.35% | 0.10% | Gain error directly affects absolute accuracy of the amplified signal; the B grade provides significantly tighter gain accuracy. |
| CMRR (min, G=100) | 90 dB | 100 dB | Higher common-mode rejection suppresses noise and interference on input lines, critical in noisy industrial environments. |
| Input Noise (RTI, 1 kHz) | 35 nV/√Hz | 35 nV/√Hz | Noise floor sets the minimum resolvable signal; identical here, so noise performance is unchanged between grades. |
| Supply Voltage Range | 2.7 V to 12 V (±1.35 V to ±6 V) | 2.7 V to 12 V (±1.35 V to ±6 V) | Determines compatibility with single-supply and dual-supply systems; identical, so power-supply design carries over. |
| Supply Current (max) | 575 µA | 575 µA | Quiescent current affects power budget in battery-powered designs; identical between grades. |
| Package | 8-Lead SOIC (R-8) | 8-Lead SOIC (R-8) | Footprint and pinout compatibility are required for physical substitutability; identical packages allow direct board replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope for the application; identical, so thermal design is unaffected. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD623ARZ-R7 | AD623BRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| 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 AD623ARZ-R7 and AD623BRZ-RL?
Both are AD623 instrumentation amplifiers in an 8-lead SOIC package. The primary difference is the grade: the AD623ARZ-R7 is the A-grade version, while the AD623BRZ-RL is the higher-grade B version. The B-grade offers tighter specifications, notably lower input offset voltage and offset voltage drift, and higher CMRR. The suffix differences also reflect packaging: R7 denotes a 7-inch reel tape-and-reel format, while RL denotes a 13-inch reel tape-and-reel format.
Are the AD623ARZ-R7 and AD623BRZ-RL 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 grade of the device and the reel size, not the package or pinout.
Can the AD623ARZ-R7 be substituted with the AD623BRZ-RL in an existing design?
Because both parts share the same package and pinout, the B-grade AD623BRZ-RL can generally be used where the A-grade AD623ARZ-R7 was specified, and it provides equal or better accuracy specifications. However, the substitution should be validated against the manufacturer datasheet and the specific design requirements, and the reel size difference (7-inch vs 13-inch) must be considered for production handling.
How do the input offset voltage specifications compare between the two grades?
The AD623B grade has a lower maximum input offset voltage than the AD623A grade. According to the Analog Devices datasheet, the B-grade maximum input offset voltage is 200 µV, while the A-grade maximum is 500 µV (both at VS = ±5 V, referred to input). The B-grade therefore offers tighter DC accuracy.
How does the gain-setting configuration differ between the AD623ARZ-R7 and AD623BRZ-RL?
There is no difference in gain configuration. Both devices use the same single external resistor between the RG pins to set gain, with the gain equation G = 1 + (100 kΩ / RG). The gain range and programming method are identical for both grades.
What supply voltage range do the AD623ARZ-R7 and AD623BRZ-RL support?
Both devices operate from a single supply of 3 V to 12 V or dual supplies of ±2.5 V to ±6 V, as specified in the Analog Devices datasheet. The supply range is identical for the A and B grades.
What does the R7 versus RL suffix mean for ordering these parts?
The R7 suffix indicates tape-and-reel packaging on a 7-inch reel, while the RL suffix indicates tape-and-reel packaging on a 13-inch reel. Both are the same SOIC package and device grade; the suffix only affects reel diameter and the quantity per reel for automated assembly.
Do the AD623ARZ-R7 and AD623BRZ-RL differ in operating temperature range?
No. Both the A and B grades of the AD623 are specified over the industrial temperature range of −40°C to +85°C, per the Analog Devices datasheet. The temperature range is the same for both orderable part numbers.