Part A
AD820BRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5309 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD820BRZ and AD820AR-REEL are functionally equivalent single-channel precision operational amplifiers from the same AD820 family, sharing identical core specifications including supply voltage range, input offset voltage grade, and SOIC-8 package footprint. The AD820BRZ offers a tighter offset voltage grade (B-grade) compared to the AD820AR-REEL (A-grade), making it a viable higher-precision substitute in most applications, while the AD820AR-REEL remains a cost-effective alternative where the tighter offset specification is not critical. Designers should confirm that the offset voltage grade difference is acceptable for their specific circuit requirements before finalizing the replacement.
Package Type
High match
Supply Voltage Range
High match
Input Offset Voltage Grade
Validation required
Amplifier Configuration
High match
Parts at a glance
Part B
AD820AR-REEL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9291 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 | AD820BRZ | AD820AR-REEL | Why it matters |
|---|---|---|---|
| Grade / Temperature Range | Industrial (-40°C to +85°C) | Industrial (-40°C to +85°C) | Both are industrial grade; the B vs A suffix denotes different performance grades rather than temperature range. |
| Input Offset Voltage (max) | 0.8 mV | 1.5 mV | Lower offset improves DC accuracy; the B grade guarantees tighter offset than the A grade. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 5 µV/°C | Lower drift maintains accuracy over temperature; the B grade is superior for precision applications. |
| Input Bias Current (max) | 10 pA | 10 pA | Very low bias current suits high-impedance sources; both grades share the same JFET input stage. |
| Gain Bandwidth Product | 1.8 MHz | 1.8 MHz | Determines the maximum signal frequency for a given closed-loop gain; identical 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) | Wide supply range enables use in both battery and industrial systems; identical for both grades. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount, tape and reel) | Same package footprint; the REEL suffix indicates tape-and-reel packaging for automated assembly. |
| Supply Current per Amplifier (typ) | 620 µA | 620 µA | Low quiescent current is important for power-sensitive designs; identical for both grades. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Defines the environmental envelope for reliable operation; identical for both grades. |
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 | AD820BRZ | AD820AR-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 | 1.9 MHz | 1.8 MHz |
| -3 dB Bandwidth | - | 1.9 MHz |
| Current - Input Bias | 2 pA | 2 pA |
| Voltage - Input Offset | 300 µV | 400 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 AD820BRZ and AD820AR-REEL?
The AD820BRZ is a single operational amplifier in an 8-lead SOIC package with a B-grade specification, offering lower offset voltage and higher precision than the A-grade. The AD820AR-REEL is the A-grade version of the same AD820 amplifier, supplied in tape-and-reel packaging for automated assembly. Both share the same core architecture, supply range, and pinout, but differ in grade-level specifications and packaging format.
Are the AD820BRZ and AD820AR-REEL electrically interchangeable in a design?
They are functionally similar and share the same pinout and package footprint, but they are not identical in specification. The B-grade (AD820BRZ) offers tighter offset voltage and drift than the A-grade (AD820AR-REEL). Substitution should only be made after verifying that the A-grade specifications meet the design's accuracy requirements, since the B-grade is the higher-precision option.
What is the difference in offset voltage between the B-grade and A-grade AD820?
The AD820B grade has a maximum input offset voltage of 0.5 mV, while the AD820A grade has a maximum input offset voltage of 1.0 mV. This is the primary grade-level distinction between the AD820BRZ and AD820AR-REEL.
Do both parts operate from the same supply voltage range?
Yes. Both the AD820BRZ and AD820AR-REEL are specified for single-supply operation from 5 V to 36 V, and for dual-supply operation from ±2.5 V to ±18 V. The supply range is common to the AD820 family and is not affected by grade or packaging.
What package and pinout do the AD820BRZ and AD820AR-REEL use?
Both devices are offered in an 8-lead SOIC package with the standard single op-amp pinout. The AD820BRZ is supplied in tube or individual packaging, while the AD820AR-REEL is supplied in tape-and-reel format. The package footprint and pin functions are identical, so PCB layout compatibility is maintained.
Why would a designer choose the AD820AR-REEL over the AD820BRZ?
The AD820AR-REEL is supplied in tape-and-reel packaging, which is suited to high-volume automated pick-and-place assembly. It is also the A-grade version, which may be selected when the tighter B-grade offset specifications are not required, allowing cost optimization without changing the circuit design.
Are the AD820BRZ and AD820AR-REEL RoHS compliant?
Both the AD820BRZ and AD820AR-REEL are RoHS-compliant parts, as indicated by the "Z" suffix in the AD820BRZ ordering code and the standard RoHS status of the AD820AR-REEL. Designers should confirm compliance status against the current manufacturer datasheet and distributor documentation for the specific lot.
Can the AD820AR-REEL be used as a drop-in replacement for the AD820BRZ?
Because both share the same package, pinout, and supply range, the AD820AR-REEL can be used in the same socket as the AD820BRZ. However, it is a lower-grade part with wider offset voltage tolerance, so it should only be substituted after confirming that the A-grade specifications satisfy the application's accuracy and drift requirements.