Part A
AD820ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7301 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Not a drop-in replacement
The AD820ARZ and AD8202WYRZ-RL are not functionally interchangeable despite sharing a similar amplifier designation. The AD820ARZ is a single-channel precision operational amplifier in an SOIC-8 package, while the AD8202WYRZ-RL is a dedicated high-voltage difference amplifier in a wider SOIC-8W package with a fixed gain of 20 and an integrated resistor network. Their input architectures, output drive characteristics, supply ranges, and target applications differ fundamentally, so substituting one for the other would require circuit redesign and validation rather than a direct swap.
Different amplifier function
Different input architecture
Different package footprint
Different supply range
Parts at a glance
Part B
AD8202WYRZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4239 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 | AD820ARZ | AD8202WYRZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Single-supply operational amplifier (op amp) | High common-mode voltage difference amplifier | These are fundamentally different functional blocks; an op amp and a difference amplifier are not directly interchangeable in most circuits. |
| 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) | ±1 mV (typical grade dependent) | ±1 mV | Offset voltage determines DC accuracy; similar values here mean comparable precision in low-level signal measurement. |
| Gain Configuration | User-configurable via external resistors | Fixed gain of 10 (internal resistors) | A fixed-gain difference amplifier cannot be reconfigured, whereas the op amp gain is set by the designer's feedback network. |
| Common-Mode Input Range | Rail-to-rail input (includes supply rails) | −2 V to +28 V (high-voltage common mode) | The AD8202WYRZ-RL is designed to sense signals far above its own supply, which the AD820ARZ cannot do. |
| Package | 8-lead SOIC | 8-lead SOIC | Identical package footprint allows drop-in board placement, though electrical function still differs. |
| Operating Temperature Range | −40 °C to +85 °C | −40 °C to +125 °C (automotive grade) | The wider temperature range of the AD8202WYRZ-RL suits automotive and harsh-environment applications. |
| Input Bias Current (typ) | ~1 pA (JFET input) | ~10 nA (bipolar input) | Very low bias current makes the AD820ARZ preferable for high-impedance sources, while the difference amplifier suits low-impedance sensing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD820ARZ | AD8202WYRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | Automotive |
| Part Status | Active | Active |
| 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 AD8202WYRZ-RL?
The AD820ARZ is a single-channel, precision, low-power JFET-input operational amplifier in an 8-lead SOIC package. The AD8202WYRZ-RL is a high common-mode voltage, single-supply difference amplifier (also in an 8-lead SOIC) designed for current-sensing and signal-conditioning applications. They are functionally different devices and are not interchangeable.
Are the AD820ARZ and AD8202WYRZ-RL pin-compatible?
No. Although both are 8-lead SOIC packages, their pin functions differ. The AD820ARZ uses the standard single op-amp pinout (offset null, inputs, supply, output), while the AD8202WYRZ-RL uses a difference-amplifier pinout (e.g., +IN, -IN, REF, OUT, V+, V-). A direct drop-in replacement is not possible without circuit redesign.
Can the AD820ARZ be used as a direct substitute for the AD8202WYRZ-RL in a current-sense circuit?
No. The AD8202WYRZ-RL is a dedicated difference amplifier with an integrated precision resistor network and a high common-mode input range (specified for operation with common-mode voltages well above the supply). The AD820ARZ is a general-purpose op-amp and does not provide the same integrated gain network or high-voltage common-mode capability, so it cannot directly replace the AD8202WYRZ-RL in such applications.
What are the supply voltage requirements for each device?
The AD820ARZ operates from a dual supply of ±2.5 V to ±15 V (or single supply of 5 V to 30 V). The AD8202WYRZ-RL operates from a single supply of 3.5 V to 12 V (with a specified common-mode input range of -2 V to +28 V). These differing supply ranges must be considered when evaluating either part for a given design.
Which device is better suited for high-side current sensing?
The AD8202WYRZ-RL is specifically designed for high-side current sensing, featuring a high common-mode input voltage range and an integrated difference amplifier configuration. The AD820ARZ, as a general-purpose JFET-input op-amp, is not optimized for high-side current sensing and would require external precision resistors and additional design considerations.
Do both parts share the same temperature range and package?
Both are offered in an 8-lead SOIC package. The AD820ARZ is specified over the industrial temperature range of -40°C to +85°C. The AD8202WYRZ-RL is specified over the automotive temperature range of -40°C to +125°C (the "W" and "Y" suffixes denote the automotive/wide-temperature grade). Always confirm the exact grade from the manufacturer datasheet for the specific orderable part number.
What are the typical input offset voltage and input bias current specifications for the AD820ARZ?
The AD820ARZ features a typical input offset voltage of 0.4 mV (1 mV maximum) and an extremely low input bias current of typically 2 pA (25 pA maximum) at room temperature, owing to its JFET input stage. These specifications make it suitable for high-impedance sensor interfaces and precision signal conditioning.
What is the fixed gain of the AD8202WYRZ-RL, and how does it differ from the AD820ARZ?
The AD8202WYRZ-RL is a fixed-gain difference amplifier with a gain of 20 V/V, set by its integrated precision resistor network. The AD820ARZ is an open-loop operational amplifier with no internal gain-setting network; its gain is determined entirely by external feedback components. This is a key functional distinction between the two parts.