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 AD620AR and AD620BR-REEL7 are functionally interchangeable instrumentation amplifiers sharing the same pinout, package, and gain architecture, with the BR grade offering tighter gain and offset specifications. The AR grade is a valid drop-in substitute where the tighter precision tolerances of the BR grade are not required, but gain error and offset performance should be validated against the application's accuracy budget.
Amplifier Function and Topology
High match
Package and Pinout
High match
Gain Range and Configuration
High match
Gain and Offset Accuracy Grade
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 | AD620AR | AD620BR-REEL7 | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 125 µV | 50 µV | Lower input offset voltage improves DC accuracy; the B grade offers tighter offset for precision applications. |
| Input Offset Voltage Drift (max) | 1.0 µV/°C | 0.6 µV/°C | Lower drift maintains accuracy over temperature; the B grade is more stable in varying thermal environments. |
| Input Bias Current (max) | 2.0 nA | 1.0 nA | Lower bias current reduces errors in high-impedance sensor interfaces; the B grade is preferable for such sources. |
| Input Noise Voltage (max, 1 kHz) | 13 nV/√Hz | 9 nV/√Hz | Lower noise improves signal-to-noise ratio for low-level signals; the B grade suits more sensitive measurements. |
| CMRR (min, G=10) | 93 dB | 100 dB | Higher common-mode rejection suppresses interference; the B grade performs better in noisy environments. |
| Gain Error (max, G=1000) | 0.15% | 0.10% | Lower gain error improves amplification accuracy; the B grade provides tighter gain precision. |
| Supply Voltage Range | ±2.3 V to ±18 V | ±2.3 V to ±18 V | Identical supply range means both parts are interchangeable for the same power rails. |
| Gain Range | 1 to 10000 | 1 to 10000 | Same gain range via a single resistor ensures functional substitutability in amplifier designs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature range confirms both parts suit the same environmental conditions. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package footprint allows drop-in replacement on existing PCB layouts. |
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-REEL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| 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 are the main differences between the AD620AR and AD620BR-REEL7?
Both are AD620 instrumentation amplifiers in an 8-lead SOIC package. The AD620AR is specified with a maximum input offset voltage of 125 µV and a maximum input offset voltage drift of 3 µV/°C, while the AD620BR-REEL7 is a higher-grade version with a maximum input offset voltage of 50 µV and a maximum drift of 0.6 µV/°C. The BR grade also has tighter gain error specifications. The "-REEL7" suffix indicates tape-and-reel packaging for automated assembly.
Are the AD620AR and AD620BR-REEL7 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions: gain-setting resistor pins (1 and 8), -IN (2), +IN (3), -VS (4), REF (5), OUTPUT (6), and +VS (7). They can occupy the same PCB land pattern.
Can the AD620AR be replaced by the AD620BR-REEL7 in an existing design?
In most cases yes, because the AD620BR-REEL7 is a higher-grade version of the same amplifier with tighter offset and drift specifications. However, the replacement should be validated against the manufacturer datasheet for the specific circuit, since supply range, gain configuration, and load conditions must still be satisfied. The BR grade is not a lower-cost substitute for the AR grade; it is a premium grade.
What is the difference in packaging between the AD620AR and AD620BR-REEL7?
The AD620AR is supplied in standard tube or tray packaging, while the AD620BR-REEL7 is supplied on a 7-inch tape-and-reel for automated pick-and-place assembly. Both use the same 8-lead SOIC body. The reel option affects handling and production logistics, not the electrical performance of the device.
Do both parts share the same gain-setting resistor formula?
Yes. Both the AD620AR and AD620BR-REEL7 use the same gain equation, G = 1 + (49.4 kΩ / R_G), where R_G is the external resistor connected between pins 1 and 8. The internal gain resistor is 49.4 kΩ for both grades, so the same R_G value produces the same nominal gain.
What are the supply voltage and quiescent current specifications for these parts?
Both the AD620AR 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 quiescent supply current of 1.3 mA. These specifications are common to both grades per the manufacturer datasheet.
Which grade should be selected for precision low-drift applications?
The AD620BR-REEL7 should be selected for precision low-drift applications because its maximum input offset voltage is 50 µV and its maximum offset voltage drift is 0.6 µV/°C, compared with 125 µV and 3 µV/°C for the AD620AR. The tighter specifications reduce DC error and thermal drift in high-accuracy signal conditioning circuits.
Are the AD620AR and AD620BR-REEL7 specified over the same temperature range?
Yes. Both grades are specified for operation over the industrial temperature range of -40 °C to +85 °C. The difference between the grades is in the guaranteed electrical limits, not in the operating temperature range.