Part A
AD820ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7301 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD820ARZ and AD820BR-REEL are functionally interchangeable single-channel precision operational amplifiers from the same AD820 family, sharing identical pinout, supply range, and input/output topology. The AD820BR-REEL offers tighter grade-based DC precision specifications, making it a suitable functional replacement candidate where enhanced accuracy is acceptable or beneficial, while the AD820ARZ remains valid for standard-precision applications.
Amplifier Type and Channel Count
High match
Package Type and Pinout
High match
Supply Voltage Range
High match
DC Precision Grade
Validation required
Parts at a glance
Part B
AD820BR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8281 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, 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 | AD820ARZ | AD820BR-REEL | Why it matters |
|---|---|---|---|
| Grade / Temperature Range | Industrial (-40°C to +85°C) | Industrial (-40°C to +85°C) | Both are industrial grade, so the operating temperature window is the same; grade affects guaranteed specs rather than the range itself. |
| Input Offset Voltage (max) | 0.8 mV | 0.4 mV | The B grade guarantees a tighter offset, which reduces DC error in precision signal-conditioning paths. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 1 µV/°C | Lower drift in the B grade keeps offset stable over temperature, important for sensors and instrumentation. |
| Input Bias Current (max) | 10 pA | 10 pA | Very low bias current suits high-impedance sources; both grades share the same JFET input characteristic. |
| Gain Bandwidth Product | 1.8 MHz | 1.8 MHz | Identical bandwidth means AC response and stability behavior are the same for both grades. |
| Supply Voltage Range | 4.5 V to 36 V (single) / ±2.25 V to ±18 V (dual) | 4.5 V to 36 V (single) / ±2.25 V to ±18 V (dual) | Same wide supply range allows either part to drop into the same rail configuration. |
| Input Voltage Noise Density | 13 nV/√Hz (at 1 kHz) | 13 nV/√Hz (at 1 kHz) | Equal noise performance means no change in SNR when substituting one grade for the other. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount, tape and reel) | Same package footprint; the B version is supplied on tape and reel for automated assembly. |
| Output Current (short-circuit) | 15 mA (typ) | 15 mA (typ) | Identical drive capability supports the same load conditions in either grade. |
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 | AD820ARZ | AD820BR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | J-FET | J-FET |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 3V/µs | 3V/µs |
| Gain Bandwidth Product | 1.8 MHz | 1.8 MHz |
| -3 dB Bandwidth | 1.9 MHz | 1.9 MHz |
| Current - Input Bias | 2 pA | 2 pA |
| Voltage - Input Offset | 400 µV | 300 µV |
| Supply Current | 700µA | 700µA |
| Current - Output / Channel | 20 mA | 20 mA |
| Voltage - Supply Span(Min) | 5 V | 5 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 primary differences between the AD820ARZ and AD820BR-REEL?
Both devices are single, precision, low-power JFET-input operational amplifiers from Analog Devices in an 8-lead SOIC package. The AD820ARZ is supplied in tube form, while the AD820BR-REEL is supplied in tape-and-reel packaging for automated assembly. The AD820BR grade is specified with tighter offset voltage and drift limits than the AD820AR grade.
Are the AD820ARZ and AD820BR-REEL electrically interchangeable in an existing design?
They share the same pinout, supply range, and functional architecture, so they are generally interchangeable at the board level. However, the B grade offers tighter guaranteed offset voltage and drift specifications, so a design that relies on the tighter limits of the AD820BR should not be downgraded to the AR grade without verifying performance against the datasheet.
What package do the AD820ARZ and AD820BR-REEL use?
Both parts are offered in an 8-lead SOIC package (R-8 suffix), with the same pin configuration: offset null, inverting input, non-inverting input, negative supply, offset null, output, positive supply, and no connect.
What are the supply voltage and quiescent current specifications for these amplifiers?
The AD820 operates from a single supply of 5 V to 36 V or a dual supply of ±2.5 V to ±18 V. Typical quiescent supply current is approximately 620 µA per amplifier, making the devices suitable for low-power precision signal conditioning.
How do the offset voltage grades of the AD820ARZ and AD820BR-REEL compare?
The AD820AR grade is specified with a maximum input offset voltage of 1 mV, while the AD820BR grade is specified with a maximum input offset voltage of 0.5 mV. The B grade also carries tighter offset voltage drift limits, which matters in applications requiring stable DC accuracy over temperature.
What is the input bias current of the AD820 devices?
Because the AD820 uses a JFET input stage, input bias current is very low, typically in the range of a few picoamperes at room temperature. This makes the AD820ARZ and AD820BR-REEL suitable for high-impedance sensor interfaces and precision integrator circuits.
Which part should be selected for high-volume automated assembly?
The AD820BR-REEL is supplied in tape-and-reel format, which is compatible with automated pick-and-place assembly lines and is typically preferred for high-volume production. The AD820ARZ in tube packaging is more commonly used for prototyping, low-volume runs, or manual assembly.
Do the AD820ARZ and AD820BR-REEL differ in operating temperature range?
No. Both grades are specified over the industrial temperature range of −40 °C to +85 °C, so the choice between them is driven by offset accuracy grade and packaging format rather than temperature range.