Part A
AD623AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7097 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD623BRZ-RL is a functionally compatible replacement candidate for the AD623AR, sharing the same instrumentation amplifier architecture, pinout, and supply range, with the BRZ grade offering tighter gain error and offset specifications. Designers should validate gain-setting resistor tolerance and offset drift against their application requirements before substituting.
Package Type
High match
Pin Configuration
High match
Supply Voltage Range
High match
Gain Error and Offset Specifications
Validation required
Parts at a glance
Part B
AD623BRZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7257 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 | AD623AR | 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 used where higher precision is required, while the A grade is a lower-cost option. |
| Input Offset Voltage (max) | 200 µV | 100 µV | Lower input offset reduces DC error at the output, which is critical in low-level signal amplification and precision measurement applications. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 1 µV/°C | Lower drift means more stable performance over temperature, important for instrumentation that must remain accurate across the operating range. |
| Gain Error (max) | 0.35% | 0.10% | Gain error directly affects the accuracy of the amplified signal; the B grade provides tighter gain accuracy for precision applications. |
| CMRR (min, G=100) | 90 dB | 100 dB | Higher common-mode rejection suppresses unwanted common-mode noise, improving measurement integrity in noisy environments. |
| Input Noise (1 kHz) | 35 nV/√Hz | 35 nV/√Hz | Input voltage noise sets the noise floor of the amplifier; both grades share the same typical noise, so noise performance is equivalent. |
| Supply Voltage Range | 2.7 V to 12 V | 2.7 V to 12 V | Both parts support the same single/dual supply range, allowing direct substitution in the same power architecture. |
| Supply Current (max) | 575 µA | 575 µA | Identical quiescent current means no change in power budget when swapping between the two grades. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout allow drop-in replacement on an existing PCB footprint. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure both parts are suitable for the same environmental conditions. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD623AR | AD623BRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | 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 key differences between the AD623AR and AD623BRZ-RL?
The AD623AR is the standard grade in an 8-lead SOIC package (R suffix), while the AD623BRZ-RL is the B grade in an 8-lead SOIC package supplied in tape-and-reel form (RL suffix). The B grade offers tighter specifications than the A grade, including lower offset voltage, lower offset voltage drift, and higher gain accuracy. Both are instrumentation amplifiers from Analog Devices with the same pinout and function.
Are the AD623AR and AD623BRZ-RL pin-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 can share the same PCB land pattern. The difference lies in grade specifications and packaging format, not pinout.
What is the difference between the A and B grades of the AD623?
The B grade (AD623BRZ-RL) is specified with tighter performance limits than the A grade (AD623AR). Per Analog Devices datasheet specifications, the B grade has lower maximum input offset voltage, lower input offset voltage drift, and tighter gain error than the A grade. The B grade is intended for applications requiring higher precision.
What does the "RL" suffix on AD623BRZ-RL indicate?
The "RL" suffix denotes tape-and-reel packaging for automated assembly. The "Z" indicates a lead-free (RoHS-compliant) package. The AD623AR is typically supplied in tube or standard packaging, while the AD623BRZ-RL is supplied in reels for high-volume pick-and-place manufacturing.
Can the AD623AR be replaced by the AD623BRZ-RL in an existing design?
Yes, in most cases. Because both are pin-compatible 8-lead SOIC instrumentation amplifiers with the same functional specifications, the B grade can generally replace the A grade. The B grade provides equal or better precision, so substitution is typically acceptable, but the designer should verify that the tighter grade specifications and the tape-and-reel packaging format meet the assembly and performance requirements.
What are the supply voltage and gain setting requirements for these devices?
Both the AD623AR and AD623BRZ-RL operate from a single supply of 2.7 V to 12 V or dual supplies of ±2.5 V to ±6 V. Gain is set by a single external resistor connected between the RG pins, with gain = 1 + (100 kΩ / RG). These parameters are common to both grades.
Do both parts share the same operating temperature range?
Yes. Both the AD623AR and AD623BRZ-RL are specified over the industrial temperature range of −40°C to +85°C, as stated in the Analog Devices AD623 datasheet. The grade difference affects precision specifications, not the rated temperature range.
Which grade should be selected for high-precision instrumentation applications?
The AD623BRZ-RL (B grade) should be selected when tighter offset voltage, lower offset drift, and better gain accuracy are required, such as in precision sensor signal conditioning. The AD623AR (A grade) is suitable for cost-sensitive applications where the standard grade specifications are sufficient.