Part A
AD627ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4972 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD627BR is a higher-grade variant of the AD627ARZ, sharing the same pinout, package, and core function as a micropower instrumentation amplifier. The BR grade offers improved offset voltage and drift specifications, making it a viable functional substitute where tighter DC precision is required, while the ARZ remains suitable for general-purpose applications. Designers should confirm gain-setting resistor values and verify offset budget against the target application before substituting.
Package Type
High match
Pin Configuration
High match
Supply Voltage Range
High match
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 | AD627BR | Why it matters |
|---|---|---|---|
| Grade / Accuracy Class | A grade | B grade | The B grade offers tighter guaranteed specifications, which directly affects precision in instrumentation and measurement circuits. |
| Input Offset Voltage (max) | 150 µV | 100 µV | Lower offset voltage reduces DC error at the output, critical for low-level signal amplification. |
| Input Offset Voltage Drift (max) | 1.0 µV/°C | 0.5 µV/°C | Lower drift maintains accuracy over temperature, important for precision and industrial applications. |
| Input Bias Current (max) | 10 nA | 5 nA | Lower bias current reduces errors when interfacing with high-impedance sources such as sensors. |
| Gain Error (max) | 0.10% | 0.05% | Tighter gain error improves overall signal chain accuracy and calibration requirements. |
| CMRR (min, G=100) | 90 dB | 96 dB | Higher common-mode rejection improves performance in noisy environments with large common-mode signals. |
| Noise (RTI, 0.1–10 Hz) | 3.0 µV p-p | 2.5 µV p-p | Lower low-frequency noise benefits precision DC and low-frequency measurement applications. |
| Supply Voltage Range | 2.2 V to 36 V | 2.2 V to 36 V | Identical supply range means both parts are interchangeable for power supply compatibility. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package ensures drop-in footprint compatibility on the PCB. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature range confirms suitability for the same environmental conditions. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD627ARZ | AD627BR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| 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 | 50 µV | 25 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 are the main differences between the AD627ARZ and AD627BR?
Both are AD627 micropower instrumentation amplifiers in an 8-lead SOIC package. The primary difference is the grade: the AD627BR is a higher-grade version with tighter guaranteed specifications, notably lower input offset voltage and offset voltage drift, and higher common-mode rejection ratio (CMRR) compared to the AD627ARZ. The AD627ARZ is the standard A-grade, while the AD627BR is the B-grade with improved DC precision.
Are the AD627ARZ and AD627BR pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pinout, so they are pin-to-pin and package-compatible. This allows the AD627BR to be used as a drop-in upgrade for the AD627ARZ on the same PCB footprint when the tighter specifications are required.
How do the input offset voltage specifications compare between the AD627ARZ and AD627BR?
The AD627BR has a tighter guaranteed maximum input offset voltage than the AD627ARZ. Per the Analog Devices datasheet, the B-grade offers a lower maximum offset voltage specification, making it preferable for applications requiring higher DC accuracy. Designers should consult the latest AD627 datasheet for the exact grade-specific limits before finalizing a design.
Do the AD627ARZ and AD627BR share the same supply voltage and quiescent current characteristics?
Yes. Both grades operate over the same single-supply range of 2.7 V to 12 V (or dual supplies of ±1.35 V to ±6 V) and draw the same low quiescent current, typically around 60 µA. The micropower operating characteristics are common to both grades; the grade difference is in guaranteed precision specifications, not in supply requirements.
Can the AD627BR be used as a direct replacement for the AD627ARZ in an existing design?
In most cases yes, because the two parts are pin-compatible and functionally identical, with the AD627BR offering equal or better guaranteed performance. However, the designer should verify that the B-grade's specifications meet the application's requirements and confirm the gain-setting resistor and circuit conditions remain valid. A direct substitution is generally acceptable when upgrading from A-grade to B-grade.
Which grade should be selected for high-precision, low-drift applications?
The AD627BR is the appropriate choice for high-precision, low-drift applications because it provides tighter guaranteed offset voltage and offset voltage drift specifications than the AD627ARZ. For cost-sensitive designs where the A-grade limits are sufficient, the AD627ARZ remains suitable. Selection should be based on the required DC accuracy and drift budget of the application.
Do both the AD627ARZ and AD627BR support the same gain-setting configuration?
Yes. Both grades use the same external resistor between the RG pins to set gain, following the same gain equation (G = 5 + 200 kΩ/RG) documented in the AD627 datasheet. The gain-setting method and achievable gain range are identical for both grades; only the guaranteed precision specifications differ.