Part A
AD623ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2845 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD623ARZ-RL and AD623BR-REEL7 are functionally interchangeable instrumentation amplifiers sharing the same pinout, supply range, and gain configuration, with the BR grade offering tighter offset voltage and gain error specifications. Both are viable substitutes in most designs, though precision-critical applications may benefit from the improved DC accuracy of the BR grade.
Package Type
High match
Supply Voltage Range
High match
Gain Configuration
High match
Input Offset Voltage Grade
Validation required
Parts at a glance
Part B
AD623BR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2030 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
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-RL | AD623BR-REEL7 | Why it matters |
|---|---|---|---|
| Grade / Accuracy Class | A grade | B grade | The B grade offers tighter guaranteed specifications (e.g., lower offset voltage and drift), so it is preferred for higher-precision designs while the A grade suits cost-sensitive applications. |
| Input Offset Voltage (max) | 200 µV | 100 µV | Lower input offset voltage reduces DC error at the output, which is critical when amplifying small differential signals. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 1 µV/°C | Lower drift maintains measurement accuracy over temperature, important for precision instrumentation across the operating range. |
| 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. |
| Gain Error (max, G=1) | 0.10% | 0.05% | Gain error directly affects signal scaling accuracy; the B grade provides tighter gain accuracy for precision applications. |
| Gain Nonlinearity (max, G=1 to 1000) | 50 ppm | 25 ppm | Better nonlinearity means the output stays proportional to input across the full gain range, improving measurement fidelity. |
| CMRR (min, G=10) | 90 dB | 100 dB | Higher common-mode rejection suppresses interference and noise, which is essential in noisy industrial environments. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Both parts support the same industrial temperature range, so environmental compatibility is identical. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Identical package and footprint allow drop-in board replacement without layout changes. |
| 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) | Matching supply ranges confirm both parts work in the same power architecture, supporting functional substitutability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD623ARZ-RL | AD623BR-REEL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| 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 key differences between the AD623ARZ-RL and AD623BR-REEL7?
Both are instrumentation amplifiers from Analog Devices based on the AD623. The primary difference is the grade: the AD623ARZ-RL is the A-grade (lower grade) and the AD623BR-REEL7 is the B-grade (higher grade). The B-grade offers tighter specifications, notably lower offset voltage and lower gain error, while both share the same functional architecture and pinout. The suffix differences also reflect packaging: ARZ-RL denotes a 7-inch reel, and BR-REEL7 denotes a 13-inch reel.
Are the AD623ARZ-RL and AD623BR-REEL7 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package with an identical pinout, so they are pin-compatible and can be used on the same PCB land pattern. Electrical performance differences between the A and B grades should be evaluated against the design requirements before substitution.
How do the offset voltage specifications compare between the two grades?
The AD623B grade has a lower maximum input offset voltage than the AD623A grade. Per the Analog Devices datasheet, the B grade is specified at a maximum input offset voltage of 200 µV, while the A grade is specified at a maximum of 500 µV. Both are specified over the industrial temperature range.
What is the gain range and gain-setting method for these amplifiers?
Both the AD623ARZ-RL and AD623BR-REEL7 are single-resistor-programmable instrumentation amplifiers. Gain is set by a single external resistor connected between the RG pins, with a gain equation of G = 1 + (100 kΩ / RG). The gain range is from 1 (RG open) to 1000, and both grades support this same gain range.
What are the supply voltage and quiescent current specifications?
Both devices operate from a single supply of 2.7 V to 12 V or dual supplies of ±2.7 V to ±6 V. The quiescent supply current is typically 550 µA (maximum 675 µA) for both grades, making them suitable for low-power signal conditioning.
Do the AD623ARZ-RL and AD623BR-REEL7 differ in gain error specifications?
Yes. The B grade offers tighter gain error than the A grade. Per the datasheet, the AD623B is specified with a maximum gain error of 0.35% at G = 1 and 0.5% at G = 1000, while the AD623A is specified at 0.5% at G = 1 and 1.0% at G = 1000. Designs requiring higher gain accuracy should select the B grade.
What bandwidth do these instrumentation amplifiers provide?
Both grades provide a -3 dB bandwidth of 800 kHz at G = 1 and 100 kHz at G = 10, with a slew rate of 0.3 V/µs. These AC specifications are common to both the A and B grades of the AD623.
What is the difference between the RL and REEL7 packaging suffixes?
The AD623ARZ-RL is supplied on a 7-inch reel, while the AD623BR-REEL7 is supplied on a 13-inch reel. Both are tape-and-reel formats for automated assembly; the reel size affects the quantity per reel and handling for production, not the device performance.