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-REEL are functionally interchangeable instrumentation amplifiers sharing the same pinout, package, and gain equation, with the BR grade offering tighter gain and offset specifications. The AR grade is a valid drop-in substitute where the tighter precision of the BR grade is not required, though designers should confirm that the relaxed gain error and offset voltage tolerances remain acceptable for the target application.
Package Type
High match
Pin Configuration
High match
Gain Range
High match
Gain Error and Offset Voltage Grade
Validation required
Parts at a glance
Part B
AD620BR-REEL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8897 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-REEL | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 125 µV | 50 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 | 0.6 µV/°C | Lower drift maintains accuracy over temperature; the B grade is preferable for wide-temperature precision designs. |
| Input Offset Current (max) | 1.0 nA | 0.5 nA | Lower offset current reduces error in high-impedance source applications; the B grade is better for such sensors. |
| Input Bias Current (max) | 2.0 nA | 1.0 nA | Lower bias current minimizes errors with high source impedance; the B grade suits precision high-impedance interfaces. |
| Common-Mode Rejection Ratio (min, G=10) | 93 dB | 100 dB | Higher CMRR rejects common-mode noise better; the B grade improves performance in noisy environments. |
| Gain Error (max, G=1000) | 0.15% | 0.10% | Lower gain error improves gain accuracy at high gains; the B grade is preferable for precision amplification. |
| Input Voltage Noise (1 kHz) | 9 nV/√Hz | 9 nV/√Hz | Noise is identical between grades, so noise-sensitive designs can use either part without penalty. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature range means both parts are interchangeable for industrial temperature environments. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount, tape and reel) | Same package footprint allows drop-in substitution; the reel option affects assembly handling only. |
| Supply Voltage Range | ±2.3 V to ±18 V | ±2.3 V to ±18 V | Identical supply range ensures both parts work in the same power systems without redesign. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD620AR | AD620BR-REEL |
|---|---|---|
| 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-REEL?
Both devices are AD620 instrumentation amplifiers in the same 8-lead SOIC package and share the same pinout and core function. The primary difference is the grade: the AD620AR is the standard grade with lower guaranteed performance specifications, while the AD620BR is the higher-grade version with tighter guaranteed specifications, including lower input offset voltage, lower input offset drift, lower input bias current, higher CMRR, and higher gain accuracy. The "-REEL" suffix on AD620BR-REEL indicates tape-and-reel packaging for automated assembly.
Are the AD620AR and AD620BR-REEL pin-compatible?
Yes. Both the AD620AR and AD620BR-REEL are offered in the same 8-lead SOIC (R-8) package with identical pin assignments: pin 1 and pin 8 are the gain-setting resistor terminals, pins 2 and 3 are the inverting and non-inverting inputs, pin 4 is -VS, pin 5 is REF, pin 6 is OUTPUT, and pin 7 is +VS. They can be used in the same PCB footprint.
Can the AD620AR be replaced by the AD620BR-REEL in an existing design?
In most cases yes, because the AD620BR-REEL is a higher-grade version of the same AD620 amplifier with the same pinout and package. However, the designer should verify that the tighter specifications of the BR grade do not affect circuit behavior (for example, gain resistor selection and offset trimming) and confirm supply voltage, gain range, and load conditions against the datasheet. The BR grade is generally a drop-in upgrade where the AR grade's specifications were marginal.
What is the difference in input offset voltage between the AD620AR and AD620BR-REEL?
The AD620AR (standard grade) has a maximum input offset voltage of 125 µV at 25°C, while the AD620BR (higher grade) has a maximum input offset voltage of 50 µV at 25°C. The BR grade therefore offers better DC precision for low-level signal amplification.
How do the input offset voltage drift specifications compare?
The AD620AR is specified with a maximum input offset voltage drift of 3.0 µV/°C, whereas the AD620BR-REEL is specified with a maximum drift of 1.0 µV/°C. The BR grade provides more stable performance over temperature, which is important in precision measurement applications.
Do the AD620AR and AD620BR-REEL differ in input bias current?
Yes. The AD620AR has a maximum input bias current of 2.0 nA at 25°C, while the AD620BR-REEL has a maximum input bias current of 1.0 nA at 25°C. The lower bias current of the BR grade reduces errors in high-impedance source applications.
What is the difference in CMRR between the two grades?
The AD620AR is specified with a minimum CMRR of 90 dB (G = 1) and 110 dB (G = 1000), while the AD620BR-REEL is specified with a minimum CMRR of 100 dB (G = 1) and 120 dB (G = 1000). The BR grade offers better common-mode rejection, which improves performance in noisy or high common-mode environments.
What does the "-REEL" suffix mean on the AD620BR-REEL?
The "-REEL" suffix indicates that the AD620BR is supplied in tape-and-reel packaging, which is intended for high-volume automated pick-and-place assembly. The AD620AR is typically supplied in tube or tray packaging. The electrical specifications of the AD620BR die are the same regardless of packaging; the suffix only describes the shipping format.
Are the AD620AR and AD620BR-REEL interchangeable in terms of gain setting?
Yes. Both devices use the same external gain resistor connected between pins 1 and 8, with the gain equation G = 49.4 kΩ / RG + 1. The gain-setting resistor value is therefore identical for a given target gain on both grades. The difference lies in the guaranteed gain accuracy and nonlinearity specifications, which are tighter on the AD620BR-REEL.