Part A
AD620ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6931 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD620ARZ and AD620BR-REEL7 are functionally interchangeable instrumentation amplifiers sharing the same pinout, package, and core specifications, with the BR grade offering tighter gain accuracy and lower offset voltage for precision applications. Both parts can serve as drop-in replacements in most circuits, though designs requiring the BR grade's enhanced DC precision should validate performance against the ARZ's wider tolerance limits.
Package Type
High match
Pin Configuration
High match
Gain Accuracy Grade
Validation required
Input Offset Voltage
Validation required
Parts at a glance
Part B
AD620BR-REEL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3446 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, 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 | AD620ARZ | AD620BR-REEL7 | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 50 µV | 25 µV | Lower offset voltage improves DC accuracy; the B grade offers tighter offset than the A grade, affecting precision in low-level signal amplification. |
| Input Offset Voltage Drift (max) | 0.6 µV/°C | 0.3 µV/°C | Drift determines offset stability over temperature; the B grade's lower drift is critical for precision measurements across temperature extremes. |
| Input Offset Current (max) | 1.0 nA | 0.5 nA | Lower offset current reduces error in high-impedance source applications; the B grade provides better performance for precision sensor interfaces. |
| Input Bias Current (max) | 2.0 nA | 1.0 nA | Bias current affects accuracy with high source impedances; the B grade's lower bias current minimizes errors in such configurations. |
| Common-Mode Rejection Ratio (min, G=10) | 100 dB | 110 dB | Higher CMRR rejects common-mode noise more effectively; the B grade offers superior rejection for noisy environments. |
| Gain Error (max, G=1000) | 0.15% | 0.10% | Gain error affects amplification accuracy; the B grade provides tighter gain accuracy for precision instrumentation. |
| Noise (0.1 Hz to 10 Hz, RTI) | 0.55 µV p-p | 0.28 µV p-p | Lower low-frequency noise improves resolution of small signals; the B grade is better suited for low-noise precision applications. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Both share the same industrial temperature range, so thermal environment compatibility is identical for either grade. |
| Package / Mounting | 8-SOIC (tube) | 8-SOIC (tape and reel) | Same SOIC footprint allows drop-in substitution; only the packaging format differs, affecting assembly handling rather than electrical function. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD620ARZ | AD620BR-REEL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Slew Rate | 1.2V/µs | 1.2V/µs |
| -3 dB Bandwidth | 1 MHz | 1 MHz |
| Current - Input Bias | 500 pA | 500 pA |
| Voltage - Input Offset | 30 µV | 15 µV |
| Supply Current | 900µA | 900µA |
| Current - Output / Channel | 18 mA | 18 mA |
| Voltage - Supply Span(Min) | 4.6 V | 4.6 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 key differences between the AD620ARZ and AD620BR-REEL7?
Both are AD620 instrumentation amplifiers from Analog Devices in the same 8-lead SOIC package, but they differ in grade and packaging. The AD620ARZ is the A-grade version with a specified maximum input offset voltage of 125 µV and a gain error of 0.15% (G=1000), while the AD620BR-REEL7 is the higher-precision B-grade version with a maximum input offset voltage of 50 µV and a gain error of 0.15% (G=1000), supplied on a 7-inch reel for automated assembly. The B-grade offers tighter offset voltage and offset voltage drift specifications.
Are the AD620ARZ and AD620BR-REEL7 pin-compatible and functionally interchangeable?
Yes. Both devices are AD620 instrumentation amplifiers in the identical 8-lead SOIC (R-8) package with the same pinout and the same gain-setting resistor formula (Rg = 49.4 kΩ/(G−1)). They are functionally interchangeable in the same circuit, but the AD620BR-REEL7 provides tighter guaranteed specifications, so a design that requires B-grade accuracy should not be downgraded to the A-grade without verifying the error budget.
What is the difference in input offset voltage and drift between the two grades?
The AD620ARZ (A grade) specifies a maximum input offset voltage of 125 µV at 25°C with a maximum offset voltage drift of 3.0 µV/°C. The AD620BR-REEL7 (B grade) specifies a maximum input offset voltage of 50 µV at 25°C with a maximum drift of 1.0 µV/°C. The B grade therefore offers roughly 2.5× tighter offset and 3× tighter drift, which matters in low-level sensor and precision bridge applications.
Do the AD620ARZ and AD620BR-REEL7 have the same gain range and gain error specifications?
Both devices are settable from G = 1 to G = 10,000 using a single external resistor, and both specify a maximum gain error of 0.15% at G = 1000. The gain equation is identical for both: Rg = 49.4 kΩ/(G−1). The B grade's advantage is in offset and drift, not in the gain-setting architecture.
What are the supply voltage and quiescent current specifications for these devices?
Both the AD620ARZ and AD620BR-REEL7 operate from dual supplies of ±2.3 V to ±18 V (or a single supply of 4.6 V to 36 V) and draw a maximum supply current of 1.3 mA. These specifications are common to the AD620 family and are not grade-dependent.
What is the difference in packaging and delivery format between the two part numbers?
The AD620ARZ is supplied in an 8-lead SOIC package in tube or standard bulk format. The AD620BR-REEL7 suffix indicates the B-grade device supplied on a 7-inch tape-and-reel for high-volume automated pick-and-place assembly. The reel quantity for the AD620BR-REEL7 is 750 pieces per 7-inch reel. The silicon package type (8-lead SOIC) is the same for both.
What are the noise and bandwidth specifications of the AD620ARZ and AD620BR-REEL7?
Both grades share the same AD620 core specifications: 0.28 µV p-p input voltage noise (0.1 Hz to 10 Hz), 9 nV/√Hz input voltage noise at 1 kHz, and a bandwidth of 120 kHz at G = 100 (800 kHz at G = 10, 1 MHz at G = 1). Noise and bandwidth are not grade-dependent and are identical between the A and B versions.
Which grade should be selected for a precision low-level sensor application?
For precision low-level sensor or bridge applications where offset and drift dominate the error budget, the AD620BR-REEL7 is the appropriate choice because of its 50 µV maximum offset and 1.0 µV/°C maximum drift. The AD620ARZ is suitable for general-purpose instrumentation where the 125 µV offset and 3.0 µV/°C drift are acceptable. Selection should be based on the design's total error budget and the verified datasheet limits for each grade.