Part A
AD620AR
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2454 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD620BR and AD620AR are functionally interchangeable instrumentation amplifiers sharing the same pinout, package, and gain equation, with the BR grade offering tighter gain and offset accuracy for precision applications. Designers can substitute the AD620AR with the AD620BR where improved DC precision is required, provided the tighter specifications are validated against the target circuit's error budget.
Package Type
High match
Pin Configuration
High match
Gain Range
High match
Gain Accuracy
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 | AD620BR | AD620AR | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 50 µV | 125 µV | Lower offset voltage reduces DC error at the output, which is critical for precision low-level signal amplification. |
| Input Offset Voltage Drift (max) | 0.6 µV/°C | 1.0 µV/°C | Lower drift maintains accuracy over temperature, important for instrumentation in varying environments. |
| Input Offset Current (max) | 0.5 nA | 1.0 nA | Lower offset current reduces error when driven from high-impedance sources. |
| Input Bias Current (max) | 1.0 nA | 2.0 nA | Lower bias current minimizes errors in high-source-impedance sensor interfaces. |
| Input Voltage Noise (1 kHz) | 9 nV/√Hz | 13 nV/√Hz | Lower noise improves signal-to-noise ratio for small-signal measurements. |
| CMRR (G=10, max) | 110 dB | 100 dB | Higher common-mode rejection suppresses interference and improves accuracy in noisy environments. |
| Gain Error (G=1000, max) | 0.15% | 0.5% | Lower gain error improves absolute accuracy of the amplified signal at high gains. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Both share the same temperature range, so environmental compatibility is equivalent. |
| Supply Voltage Range | ±2.3 V to ±18 V | ±2.3 V to ±18 V | Identical supply range means both can be used in the same power architecture. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package ensures drop-in footprint compatibility on the PCB. |
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 | AD620AR | AD620BR |
|---|---|---|
| Part Status | Obsolete | 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 is the main difference between the AD620BR and AD620AR?
The primary difference is the grade specification. The AD620BR is a higher-grade version of the AD620 instrumentation amplifier with tighter guaranteed specifications than the AD620AR, particularly for input offset voltage, input offset voltage drift, input bias current, and gain error. Both are functionally identical pin-compatible instrumentation amplifiers in the same package options.
Are the AD620BR and AD620AR pin-compatible?
Yes. Both the AD620BR and AD620AR are offered in the same standard 8-lead packages (such as 8-lead SOIC and 8-lead PDIP) with identical pinouts. The pin functions (gain resistor pins, input pins, output, reference, and supply pins) are the same, so they are pin-compatible when the package type matches.
Can the AD620AR be replaced directly with the AD620BR in an existing design?
In most cases yes, because the AD620BR is a higher-grade version of the same device with the same pinout and function. However, the replacement should be validated against the manufacturer datasheet for the specific package and the design's accuracy requirements, since the BR grade offers tighter guaranteed limits rather than different functionality.
Which grade offers better DC accuracy, the AD620BR or the AD620AR?
The AD620BR offers better guaranteed DC accuracy. As the higher grade, it specifies tighter maximum input offset voltage, lower input offset voltage drift, and lower input bias current compared with the AD620AR. Designers requiring tighter precision should select the BR grade, subject to the datasheet limits for the chosen package.
Do the AD620BR and AD620AR have the same gain equation and gain range?
Yes. Both devices use the same standard instrumentation amplifier gain equation, G = 1 + (49.4 kΩ / RG), and support the same gain range set by a single external gain resistor RG. The difference between grades is in guaranteed specification limits, not in the gain configuration method.
Are the supply voltage and operating temperature ranges the same for both grades?
Both the AD620BR and AD620AR operate from the same supply voltage range and are specified over the same industrial temperature range as defined in the manufacturer datasheet. The grade suffix (A vs B) denotes specification tightness, not a different supply or temperature rating. Always confirm the exact limits for the specific package and temperature grade in the official datasheet.
Why is the AD620BR typically more expensive than the AD620AR?
The AD620BR is a higher-grade part with tighter guaranteed specifications, which requires more stringent testing and selection during manufacturing. This results in a higher cost compared with the AD620AR. The price difference reflects the tighter performance guarantees rather than any functional difference.