Part A
AD820ARZ
ADI公司
- Lifecycle
- Active
- Stock
- 7301 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Not a drop-in replacement
The AD820ARZ and AD8202YR are not functionally interchangeable: the AD820ARZ is a single-channel general-purpose operational amplifier in an SOIC-8 package, while the AD8202YR is a dedicated high-voltage difference amplifier in an SOIC-8 package with a fixed gain of 20 and an integrated resistor network. Their differing signal conditioning architecture, gain configuration, and input common-mode behavior make direct substitution impractical without circuit redesign.
Different amplifier function
Different gain configuration
Different input architecture
Different application role
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 | AD8202YR | Why it matters |
|---|---|---|---|
| Amplifier Type | Single, precision, low power JFET-input op amp | Single, high voltage, bidirectional current sense amplifier | The two parts serve fundamentally different functions; one is a general-purpose op amp and the other is a dedicated current-sense amplifier, so they are not functionally interchangeable. |
| Number of Channels | 1 | 1 | Both are single-channel devices, so channel count alone does not differentiate them. |
| Supply Voltage Range | 4.5 V to 36 V (single supply) | 3.5 V to 12 V (single supply) | The AD820ARZ tolerates much higher supply voltages, which affects compatibility with the system power rail. |
| Input Offset Voltage (max) | 0.8 mV | 1 mV | Offset voltage determines DC accuracy; the AD820ARZ offers slightly better guaranteed offset performance. |
| Input Bias Current (typ) | 2 pA (JFET input) | 1 µA | The JFET input of the AD820ARZ gives extremely low bias current, critical for high-impedance sensor interfaces, whereas the AD8202YR draws far more. |
| Gain Bandwidth Product | 1.8 MHz | Not applicable (fixed gain current sense amplifier) | The AD820ARZ is a general-purpose op amp with defined GBW, while the AD8202YR has a fixed internal gain configuration, so bandwidth specifications are not directly comparable. |
| Fixed Gain | Not applicable (external feedback) | 20 V/V | The AD8202YR has a factory-set gain of 20 for current-sense applications, while the AD820ARZ requires external resistors to set gain. |
| Package | 8-lead SOIC | 8-lead SOIC | Both use the same 8-lead SOIC footprint, so board layout compatibility is maintained even though the functions differ. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The AD8202YR supports a wider temperature range, making it suitable for harsher environments. |
| Typical Supply Current | 620 µA | 1.6 mA | The AD820ARZ consumes significantly less supply current, which matters for low-power and battery-operated designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD820ARZ | AD8202YR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | J-FET | Differential |
| Number of Circuits | 1 | 1 |
| Slew Rate | 3V/µs | 0.28V/µs |
| Gain Bandwidth Product | 1.8 MHz | 50 kHz |
| Current - Input Bias | 2 pA | 40 nA |
| Voltage - Input Offset | 400 µV | 1 mV |
| Supply Current | 700µA | 250µA |
| Voltage - Supply Span(Min) | 5 V | 3.5 V |
| Voltage - Supply Span(Max) | 36 V | 12 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | Rail-to-Rail | - |
| -3 dB Bandwidth | 1.9 MHz | - |
| Current - Output / Channel | 20 mA | - |
Frequently asked questions
What are the fundamental differences between the AD820ARZ and the AD8202YR?
The AD820ARZ is a single-channel, precision, low-power JFET-input operational amplifier, whereas the AD8202YR is a high common-mode voltage, single-supply difference amplifier. The AD820ARZ is designed for general-purpose signal conditioning and buffering, while the AD8202YR is specifically intended for current-sensing and high-side shunt monitoring applications.
Are the AD820ARZ and AD8202YR pin-compatible or interchangeable?
No. The AD820ARZ is supplied in an 8-lead SOIC package (R-8) with a standard op-amp pinout (offset null, inputs, supply, output). The AD8202YR is supplied in an 8-lead SOIC package (R-8) but with a difference-amplifier pinout (including a VREF pin and a dedicated gain/output configuration). Because the pin functions differ, they are not interchangeable on the same PCB footprint.
What are the supply voltage requirements for each device?
The AD820ARZ operates from a dual supply of ±2.5 V to ±15 V (or a single supply of 5 V to 30 V). The AD8202YR operates from a single supply of 4.5 V to 5.5 V, with an absolute maximum supply of 6 V. The AD8202YR is therefore not suitable for the higher-voltage rails that the AD820ARZ supports.
How do the input common-mode voltage ranges compare?
The AD820ARZ has a common-mode input range that extends from the negative supply to within approximately 1.5 V of the positive supply (rail-to-rail input on the negative side). The AD8202YR is designed for high-side current sensing and supports a common-mode input voltage range of −2 V to +28 V, independent of its 5 V supply, which is a key advantage for shunt-based current monitoring.
What are the typical gain configurations for the AD820ARZ and AD8202YR?
The AD820ARZ is an open-loop operational amplifier, so its gain is set externally by the user via feedback resistors, allowing any closed-loop gain configuration. The AD8202YR is a fixed-gain difference amplifier with a gain of 20 V/V, factory-trimmed for precision current-sensing applications.
How do the bandwidth and slew rate specifications differ?
The AD820ARZ has a unity-gain bandwidth of 1.9 MHz and a slew rate of 3 V/µs. The AD8202YR has a bandwidth of 50 kHz (at G = 20) and a slew rate of 0.5 V/µs. The AD820ARZ is therefore better suited for higher-frequency signal processing, while the AD8202YR is optimized for low-frequency current-sense accuracy.
What are the input offset voltage and drift characteristics of each part?
The AD820ARZ specifies a maximum input offset voltage of 1 mV (typical 0.4 mV) with a typical offset drift of 2 µV/°C. The AD8202YR specifies a maximum input offset voltage of 2 mV (referred to input) with a typical offset drift of 10 µV/°C. The AD820ARZ offers tighter offset and drift performance for precision op-amp applications.
Which device is better suited for high-side current sensing?
The AD8202YR is specifically designed for high-side current sensing, featuring a −2 V to +28 V common-mode input range, a fixed gain of 20 V/V, and a dedicated VREF pin for level shifting. The AD820ARZ, as a general-purpose op-amp, would require external resistor networks and additional level-shifting circuitry to achieve comparable high-side sensing performance.
What are the operating temperature ranges for the AD820ARZ and AD8202YR?
Both the AD820ARZ and AD8202YR are specified for the industrial temperature range of −40°C to +85°C. Neither part is rated for extended or automotive temperature ranges beyond this specification.