Part A
AD8205YRZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6907 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Not a drop-in replacement
The AD820BRZ and AD8205YRZ-R7 are not functionally interchangeable. The AD820BRZ is a single-channel precision operational amplifier, while the AD8205YRZ-R7 is a single-supply current shunt amplifier with a fixed gain of 50 V/V and a differential input range of ±250 mV. Their differing output types, input topologies, gain configurations, and package footprints make direct substitution impractical without substantial circuit redesign.
Different output type
Different input topology
Different gain configuration
Different footprint
Parts at a glance
Part B
AD820BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5309 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
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 | AD8205YRZ-R7 | Why it matters |
|---|---|---|---|
| Amplifier Type | Single-supply, rail-to-rail output operational amplifier | High-voltage current shunt amplifier | These are fundamentally different functional classes; one is a general-purpose op amp and the other is a dedicated current-sense amplifier, so they are not direct substitutes. |
| Number of Channels | 1 | 1 | Channel count affects how many signal paths can be processed per package; both are single-channel, so this does not differentiate them. |
| Supply Voltage Range | 4.5 V to 36 V (single supply) | 4.5 V to 5.5 V | The usable supply range determines compatibility with the system power rail; the AD820BRZ supports much higher voltages than the AD8205YRZ-R7. |
| Input Offset Voltage (max) | 0.8 mV | 2 mV | Lower offset voltage improves DC accuracy; the AD820BRZ offers better offset performance than the AD8205YRZ-R7. |
| Gain Bandwidth Product | 1.8 MHz | Not applicable (fixed gain current-sense amplifier) | GBW indicates the bandwidth available for signal amplification; the AD8205YRZ-R7 has a fixed gain architecture, so GBW is not a comparable specification. |
| Gain Configuration | External (set by feedback network) | Fixed gain of 20 V/V | Fixed versus adjustable gain determines design flexibility; the AD820BRZ allows user-defined gain while the AD8205YRZ-R7 is factory-set. |
| Common-Mode Input Range | Rail-to-rail input (includes supply rails) | -2 V to +65 V (independent of supply) | Common-mode range defines the allowable input signal window; the AD8205YRZ-R7 is designed for high-voltage current sensing far beyond its supply rails. |
| Package / Mounting | 8-Lead SOIC (Surface Mount) | 8-Lead SOIC (Surface Mount) | Package and mounting type affect PCB footprint and assembly; both share the same SOIC-8 footprint, so they are physically interchangeable. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The temperature range determines suitability for harsh environments; the AD8205YRZ-R7 supports a wider industrial temperature range. |
| Typical Supply Current | 0.62 mA | 2 mA | Supply current impacts power budget and thermal design; the AD820BRZ draws significantly less quiescent current than the AD8205YRZ-R7. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8205YRZ-R7 | AD820BRZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Differential | J-FET |
| Number of Circuits | 1 | 1 |
| Slew Rate | 0.5V/µs | 3V/µs |
| -3 dB Bandwidth | 50 kHz | - |
| Voltage - Input Offset | 2 mV | 300 µV |
| Supply Current | 2mA | 700µA |
| Voltage - Supply Span(Min) | 4.5 V | 5 V |
| Voltage - Supply Span(Max) | 5.5 V | 36 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | - | Rail-to-Rail |
| Gain Bandwidth Product | - | 1.9 MHz |
| Current - Input Bias | - | 2 pA |
| Current - Output / Channel | - | 20 mA |
Frequently asked questions
Are the AD820BRZ and AD8205YRZ-R7 interchangeable in a circuit design?
No. The AD820BRZ is a single-channel, low-power, precision operational amplifier, while the AD8205YRZ-R7 is a single-supply, bidirectional current shunt monitor. They have different functions, pinouts, and internal architectures, so they are not direct substitutes.
What are the primary functional differences between the AD820BRZ and AD8205YRZ-R7?
The AD820BRZ is a general-purpose operational amplifier designed for signal conditioning, filtering, and amplification. The AD8205YRZ-R7 is a dedicated current shunt monitor that amplifies the small differential voltage across a shunt resistor in battery management, motor control, and power supply applications.
Do the AD820BRZ and AD8205YRZ-R7 have the same package and pinout?
No. The AD820BRZ is typically supplied in an 8-lead SOIC package, while the AD8205YRZ-R7 is supplied in an 8-lead SOIC package as well, but their pin functions differ. The AD8205YRZ-R7 includes dedicated +IN, -IN, and REF pins for current sensing, whereas the AD820BRZ has standard op amp pins (IN+, IN-, OUT, V+, V-).
Can the AD820BRZ be used as a current shunt monitor like the AD8205YRZ-R7?
Not directly. The AD820BRZ is a standard op amp and lacks the integrated precision gain resistors and dedicated differential input architecture of the AD8205YRZ-R7. While an external circuit can be built around the AD820BRZ for current sensing, it will not match the AD8205YRZ-R7's specified gain accuracy, common-mode rejection, and integrated functionality.
What are the supply voltage ranges for the AD820BRZ and AD8205YRZ-R7?
The AD820BRZ operates from a single supply of 5 V to 36 V or dual supplies of ±2.5 V to ±18 V. The AD8205YRZ-R7 operates from a single supply of 4.5 V to 5.5 V. These ranges are not compatible for direct replacement without verifying the target system's power rails.
Which part is better suited for battery current monitoring?
The AD8205YRZ-R7 is specifically designed for battery current monitoring due to its bidirectional current sensing capability, high common-mode voltage range, and integrated gain network. The AD820BRZ would require additional external components and careful design to achieve similar performance.
Are the AD820BRZ and AD8205YRZ-R7 pin-compatible with each other?
No. Even though both may be in 8-lead SOIC packages, their pin assignments are different. The AD8205YRZ-R7 has pins for +IN, -IN, REF1, REF2, OUT, V+, and GND, while the AD820BRZ has pins for NULL, IN-, IN+, V-, and OUT. Substituting one for the other without redesigning the PCB will result in incorrect operation.