Part A
AD623ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4377 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD623ARZ 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 tolerances. The ARZ variant remains a valid drop-in substitute where the tighter B-grade precision specifications are not mandatory, while designs requiring enhanced DC accuracy should retain the BRZ-RL grade.
Package and Pinout
High match
Supply Voltage Range
High match
Gain Configuration
High match
Offset Voltage and Gain Error 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 | AD623BRZ-RL | Why it matters |
|---|---|---|---|
| Grade / Accuracy Class | A grade | B grade | The B grade offers tighter guaranteed specifications (notably lower offset voltage and higher gain accuracy), which directly affects measurement precision in instrumentation applications. |
| Input Offset Voltage (max) | 200 µV | 100 µV | Lower input offset voltage reduces DC error at the output, improving accuracy for low-level differential signal amplification. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 1 µV/°C | Lower drift means offset error stays more stable over temperature, which is critical for precision measurements across the operating range. |
| Gain Error (max, G=1) | 0.10% | 0.05% | Tighter gain error improves the accuracy of the amplified signal, directly impacting overall system measurement accuracy. |
| Input Bias Current (max) | 25 nA | 25 nA | Bias current interacts with source impedance to create offset errors; both grades share the same limit here, so this is not a differentiator. |
| Common-Mode Rejection Ratio (min, G=10) | 100 dB | 110 dB | Higher CMRR rejects common-mode noise and interference more effectively, improving signal integrity in noisy environments. |
| Supply Voltage Range | 2.7 V to 12 V (single) / ±2.5 V to ±6 V (dual) | 2.7 V to 12 V (single) / ±2.5 V to ±6 V (dual) | Identical supply flexibility means both parts are interchangeable for the same power rail designs. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature range confirms both parts suit the same environmental conditions. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount, tape and reel) | Same package footprint allows drop-in replacement; the RL suffix indicates tape-and-reel packaging suited to automated assembly. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD623ARZ | 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 and AD623BRZ-RL?
Both are AD623 instrumentation amplifiers in an 8-lead SOIC package. The AD623ARZ is a tube-packaged device with a specified gain error of 0.35% max (G=1) and 0.5% max (G=1000), while the AD623BRZ-RL is a tape-and-reel packaged device with tighter gain error of 0.25% max (G=1) and 0.35% max (G=1000). The B grade also offers lower offset voltage and offset drift than the A grade.
Are the AD623ARZ and AD623BRZ-RL pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions: -IN, +IN, RG, RG, REF, OUTPUT, +VS, and -VS. They can share the same PCB land pattern.
What is the supply voltage range for these devices?
Both the AD623ARZ and AD623BRZ-RL operate from a single supply of 2.7 V to 12 V, or from dual supplies of ±2.7 V to ±6 V, as specified in the Analog Devices datasheet.
How is gain set on the AD623ARZ and AD623BRZ-RL?
Gain is programmed with a single external resistor RG connected between the RG pins, using the relationship G = 1 + (100 kΩ / RG). This applies to both the A and B grades.
Do the AD623ARZ and AD623BRZ-RL differ in offset voltage specifications?
Yes. The AD623BRZ-RL (B grade) has tighter offset voltage specifications than the AD623ARZ (A grade). The B grade offers lower input offset voltage and lower offset voltage drift, making it preferable for precision applications. Consult the Analog Devices datasheet for the exact grade-specific limits.
What is the difference in packaging between the AD623ARZ and AD623BRZ-RL?
The AD623ARZ is supplied in tube packaging, while the AD623BRZ-RL is supplied in tape-and-reel packaging (the -RL suffix denotes reel). Both use the same 8-lead SOIC body.
Can the AD623ARZ be used as a drop-in replacement for the AD623BRZ-RL?
They are pin-compatible and functionally equivalent, but the B grade offers tighter gain error and offset specifications. Substitution is acceptable only if the A-grade specifications meet the design requirements; verify gain error, offset voltage, and drift against the datasheet before replacing a B-grade part with an A-grade part.