Part A
AD627BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6920 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Compatible functional replacement candidate
The AD627ARZ and AD627BRZ are functionally interchangeable micropower instrumentation amplifiers sharing identical pinout, package, supply range, and gain configuration; the BRZ grade offers tighter guaranteed offset voltage and offset drift, making it a valid drop-in candidate where the relaxed A-grade DC precision of the ARZ is acceptable.
Package and Pinout
High match
Supply Voltage Range
High match
Gain Configuration
High match
Input Offset Voltage Grade
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD627ARZ | AD627BRZ | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 150 µV | 75 µV | Lower offset voltage improves DC accuracy; the B grade offers tighter offset for precision measurement applications. |
| Input Offset Voltage Drift (max) | 1.0 µV/°C | 0.5 µV/°C | Lower drift maintains accuracy over temperature; the B grade is preferable for wide-temperature precision designs. |
| Input Bias Current (max) | 10 nA | 5 nA | Lower bias current reduces errors with high-impedance sources; the B grade suits higher source impedance sensors. |
| Gain Error (max) | 0.10% | 0.05% | Gain error affects signal scaling accuracy; the B grade provides tighter gain accuracy for calibrated systems. |
| Gain Nonlinearity (max) | 50 ppm | 25 ppm | Better nonlinearity means less distortion across the signal range; the B grade is better for high-linearity requirements. |
| CMRR (min, G=100) | 90 dB | 96 dB | Higher common-mode rejection suppresses interference; the B grade performs better in noisy common-mode environments. |
| Noise (RTI, 0.1–10 Hz) | 3.0 µV p-p | 2.5 µV p-p | Lower low-frequency noise improves resolution for slow-moving signals; the B grade benefits low-level sensor amplification. |
| Supply Voltage Range | 2.2 V to 36 V | 2.2 V to 36 V | Identical supply range means both parts are interchangeable for the same power rail configuration. |
| Supply Current (max) | 85 µA | 85 µA | Identical quiescent current means equivalent power consumption in battery-powered or low-power designs. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package ensures footprint and assembly compatibility for drop-in substitution. |
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 | AD627BRZ | AD627ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.06V/µs | 0.06V/µs |
| -3 dB Bandwidth | 80 kHz | 80 kHz |
| Current - Input Bias | 2 nA | 2 nA |
| Voltage - Input Offset | 25 µV | 50 µV |
| Supply Current | 60µA | 60µA |
| Current - Output / Channel | 25 mA | 25 mA |
| Voltage - Supply Span(Min) | 2.2 V | 2.2 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the primary difference between the AD627ARZ and AD627BRZ?
The AD627ARZ and AD627BRZ are both micropower instrumentation amplifiers from Analog Devices, but they differ in their specified grade and guaranteed performance. The AD627BRZ is the higher-grade version, offering tighter guaranteed specifications such as lower input offset voltage and offset voltage drift compared to the AD627ARZ. Both are specified over the industrial temperature range and are functionally identical in pinout and package.
Are the AD627ARZ and AD627BRZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package (R-8 suffix) with identical pin functions. This means they share the same PCB land pattern and can be interchanged at the board level without layout changes, provided the application's performance requirements are met by the selected grade.
What are the guaranteed input offset voltage specifications for each grade?
Per the Analog Devices datasheet, the AD627ARZ (A grade) is specified with a maximum input offset voltage of 250 µV, while the AD627BRZ (B grade) is specified with a maximum input offset voltage of 150 µV. The B grade therefore offers tighter offset voltage tolerance for applications requiring higher DC precision.
How do the offset voltage drift specifications compare between the two grades?
The AD627ARZ is specified with a maximum input offset voltage drift of 3 µV/°C, whereas the AD627BRZ is specified with a maximum drift of 1 µV/°C. The lower drift of the B grade makes it preferable for applications operating over wide temperature ranges where offset stability is critical.
Do the AD627ARZ and AD627BRZ share the same supply voltage and quiescent current characteristics?
Yes. Both grades operate from a single supply of 2.2 V to 36 V (or dual supplies of ±1.1 V to ±18 V) and draw a typical quiescent current of 60 µA. The micropower consumption is common to both grades and is not a differentiating parameter between the A and B versions.
Can the AD627ARZ be used as a drop-in replacement for the AD627BRZ in an existing design?
Because both parts are pin-compatible and functionally identical, the AD627ARZ can physically replace the AD627BRZ. However, the A grade has looser guaranteed offset voltage and drift specifications. The substitution is acceptable only if the application's error budget tolerates the wider A-grade limits; otherwise, the B grade should be retained.
What is the gain configuration and gain range for both devices?
Both the AD627ARZ and AD627BRZ are configured with a single external resistor to set gain, supporting a gain range of 1 to 1000. The gain equation and resistor selection are identical for both grades, so the same external components apply regardless of which grade is used.
Which grade should be selected for a precision low-drift instrumentation amplifier application?
For precision applications requiring tight DC accuracy over temperature, the AD627BRZ is the appropriate choice because of its lower guaranteed maximum input offset voltage (150 µV) and lower offset voltage drift (1 µV/°C). The AD627ARZ is suitable for cost-sensitive designs where the wider 250 µV offset and 3 µV/°C drift limits are acceptable.