Part A
AD820ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7301 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The AD820ARZ and AD8202YRZ-RL are not drop-in replacements for one another. The AD820ARZ is a single-channel, general-purpose operational amplifier in an SOIC-8 package, while the AD8202YRZ-RL is a dedicated high-voltage, bidirectional current-sense amplifier in an SOIC-8 package with a fixed gain of 20 V/V and a differential input structure. Their functional roles, input topologies, gain configurations, and output behavior differ fundamentally, so substituting one for the other requires circuit redesign and validation rather than a direct swap.
Different amplifier function
Different input topology
Different gain configuration
Different output behavior
Parts at a glance
Part B
AD8202YRZ-RL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6150 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 | AD820ARZ | AD8202YRZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Single, precision, low power JFET input op amp | Single, high voltage, precision difference amplifier | The two parts are fundamentally different amplifier topologies; a difference amplifier is not a drop-in replacement for a general-purpose op amp. |
| Number of Channels | 1 | 1 | Both are single-channel devices, so channel count alone does not differentiate them for substitution. |
| Supply Voltage Range | 4.5 V to 36 V (single supply) | 3.5 V to 12 V (single supply) | The AD8202 cannot operate at the higher supply voltages supported by the AD820, limiting direct interchangeability in high-voltage systems. |
| Input Offset Voltage (max) | 0.8 mV | 1 mV | Offset voltage affects DC accuracy; the AD820 offers slightly better guaranteed offset performance. |
| Input Bias Current (typ) | 2 pA (JFET input) | ~1 nA (bipolar input) | The JFET input of the AD820 provides far lower bias current, critical for high-impedance sensor interfaces where the AD8202 would introduce larger errors. |
| Gain Configuration | User-configurable (external resistors) | Fixed gain of 10 (internal resistors) | The AD8202 has a factory-set gain of 10, while the AD820 requires external gain-setting resistors, so circuit topology must change for substitution. |
| Gain Bandwidth Product | 1.9 MHz | ~1 MHz (at G=10) | Bandwidth determines the maximum signal frequency the amplifier can handle accurately; the AD820 provides wider bandwidth. |
| Input Common-Mode Voltage Range | Rail-to-rail input (includes supply rails) | -2 V to +28 V (high voltage CM) | The AD8202 is designed for high common-mode voltages beyond its supply, while the AD820 is rail-to-rail; this affects suitability for high-side sensing applications. |
| Package | 8-lead SOIC | 8-lead SOIC | Both use the same 8-lead SOIC footprint, so board-level physical compatibility exists even though electrical behavior differs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The AD8202 supports a wider temperature range, making it preferable for harsh-environment applications where the AD820 would be marginal. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD820ARZ | AD8202YRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| 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
Are the AD820ARZ and AD8202YRZ-RL interchangeable in a circuit design?
No, they are not interchangeable. The AD820ARZ is a single-channel, precision, low-power JFET-input operational amplifier, while the AD8202YRZ-RL is a high common-mode voltage difference amplifier. They serve fundamentally different functions and have different pinouts and internal architectures, so one cannot directly replace the other.
What are the key functional differences between the AD820ARZ and AD8202YRZ-RL?
The AD820ARZ is a general-purpose single op amp with JFET inputs, featuring very low input bias current and rail-to-rail output, intended for signal conditioning and buffering. The AD8202YRZ-RL is a difference amplifier designed to amplify small differential signals riding on a high common-mode voltage (up to ±250 V), typically used in current-sensing and high-side sensing applications.
What are the package and pinout differences between the two parts?
The AD820ARZ is supplied in an 8-lead SOIC package (SOIC_N) with the standard single op amp pinout. The AD8202YRZ-RL is supplied in an 8-lead SOIC package as well, but its pinout is dedicated to the difference amplifier function (including +IN, -IN, VREF1, VREF2, and output), so the pin functions are not compatible with the AD820ARZ.
Do the AD820ARZ and AD8202YRZ-RL have the same supply voltage requirements?
No. The AD820ARZ operates from a single supply of 5 V to 36 V or a dual supply of ±2.5 V to ±18 V. The AD8202YRZ-RL operates from a single supply of 3.5 V to 12 V. The supply ranges differ, so the power supply design must be validated for the specific part used.
Which part is suitable for high-side current sensing?
The AD8202YRZ-RL is the appropriate choice for high-side current sensing because it is a dedicated difference amplifier with a high common-mode input voltage range of up to ±250 V. The AD820ARZ is a general-purpose op amp and is not specified for high common-mode voltage sensing.
Are the input bias current specifications comparable between the two parts?
No. The AD820ARZ uses JFET inputs with an input bias current typically in the low picoampere range (around 2 pA typical at room temperature), making it suitable for high-impedance sensor interfaces. The AD8202YRZ-RL is a bipolar difference amplifier with input bias currents in the nanoampere to microampere range, so it is not intended for ultra-high-impedance input applications.
Can the AD8202YRZ-RL be used as a general-purpose op amp like the AD820ARZ?
No. The AD8202YRZ-RL is a fixed-gain difference amplifier with internal resistor networks and a specific input/output topology; it is not a general-purpose op amp and cannot be configured as a standard voltage follower or arbitrary gain stage. The AD820ARZ is the general-purpose op amp in this comparison.
What is the difference in gain configuration between the two devices?
The AD820ARZ is an open-loop op amp whose gain is set externally by the user with feedback resistors, allowing arbitrary closed-loop configurations. The AD8202YRZ-RL is a difference amplifier with a fixed internal gain (typically 20 V/V) set by on-chip resistor networks, so its gain is not user-adjustable.