Part A
AD820ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7301 PCS
- Package
- SOIC-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Not a drop-in replacement
The AD820ARZ and AD8206WHRZ are not functionally interchangeable despite sharing a similar package outline. The AD820ARZ is a general-purpose precision operational amplifier, while the AD8206WHRZ is a dedicated high-voltage current-sense amplifier with a fixed gain of 20 V/V and an integrated resistor network. Their input architectures, output behavior, and application roles differ fundamentally, so the AD8206WHRZ cannot serve as a direct substitute for the AD820ARZ in signal-conditioning circuits, nor vice versa in current-sensing designs.
Different amplifier function
Different gain configuration
Different input topology
Different application role
Parts at a glance
Part B
AD8206WHRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4749 PCS
- Package
- SOIC-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
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 | AD8206WHRZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Single, precision, low power JFET-input operational amplifier | Single, high common-mode voltage difference amplifier | The two parts serve fundamentally different functions; one is a general-purpose op amp and the other is a dedicated current-sense difference 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 for substitution. |
| Input Offset Voltage (max) | 0.8 mV (typical 0.1 mV) | 2 mV | Offset voltage directly affects DC accuracy; the AD820ARZ offers tighter offset, which matters for precision signal conditioning. |
| Input Bias Current (typ) | 2 pA (JFET input) | 2 µA | Very low bias current in the AD820ARZ suits high-impedance sources, while the AD8206WHRZ's higher bias current is acceptable for low-impedance shunt sensing. |
| Gain Configuration | User-configurable (external feedback) | Fixed gain of 20 V/V | A fixed gain of 20 makes the AD8206WHRZ a drop-in for shunt-based current sensing, whereas the AD820ARZ requires external resistors to set gain. |
| Common-Mode Input Range | Rail-to-rail input (to supply rails) | −2 V to +65 V (independent of supply) | The AD8206WHRZ's extended high-voltage common-mode range is essential for high-side current sensing, a capability the AD820ARZ does not provide. |
| Supply Voltage Range | 4.5 V to 36 V (single) or ±2.25 V to ±18 V (dual) | 4.5 V to 5.5 V (single supply) | The AD820ARZ supports a much wider supply range, while the AD8206WHRZ is restricted to 5 V systems, limiting direct substitution. |
| Bandwidth (typ) | 1.9 MHz (gain = 1) | 100 kHz (gain = 20) | Bandwidth determines the maximum signal frequency each device can handle; the AD820ARZ is suited to wider-band signals, the AD8206WHRZ to lower-frequency current sensing. |
| Operating Temperature Range | −40 °C to +85 °C | −40 °C to +125 °C | The wider temperature range of the AD8206WHRZ supports harsher automotive/industrial environments, which the AD820ARZ does not cover. |
| Package | 8-lead SOIC (R-8) | 8-lead SOIC (R-8) | Identical package and pin count allow board-level footprint compatibility, though electrical function still differs. |
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 | AD820ARZ | AD8206WHRZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Series | - | Automotive |
| Part Status | Active | Active |
| Amplifier Type | J-FET | Differential |
| Number of Circuits | 1 | 1 |
| Slew Rate | 3V/µs | 0.5V/µs |
| -3 dB Bandwidth | 1.9 MHz | 100 kHz |
| Voltage - Input Offset | 400 µV | 2 mV |
| Supply Current | 700µA | 2mA |
| Voltage - Supply Span(Min) | 5 V | 4.5 V |
| Voltage - Supply Span(Max) | 36 V | 5.5 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | Rail-to-Rail | - |
| Gain Bandwidth Product | 1.8 MHz | - |
| Current - Input Bias | 2 pA | - |
| Current - Output / Channel | 20 mA | - |
Frequently asked questions
What are the fundamental differences between the AD820ARZ and the AD8206WHRZ?
The AD820ARZ is a single-channel, precision, low-power operational amplifier in an 8-lead SOIC package, while the AD8206WHRZ is a high-voltage, bidirectional current-sense amplifier in an 8-lead SOIC package. The AD820ARZ is a general-purpose op amp, whereas the AD8206WHRZ is purpose-built for current sensing with an integrated gain of 20 V/V and a common-mode input range of -2 V to +65 V.
Can the AD820ARZ and AD8206WHRZ be used interchangeably in a design?
No. The AD820ARZ is a standard operational amplifier requiring external feedback components to set gain, while the AD8206WHRZ is a fixed-gain (20 V/V) current-sense amplifier with a dedicated differential input structure and a much wider common-mode input range. Their pin functions and internal architectures differ, so they are not pin-for-pin or function-for-function substitutes.
What is the common-mode input voltage range of the AD8206WHRZ compared to the AD820ARZ?
The AD8206WHRZ supports a common-mode input voltage range of -2 V to +65 V, making it suitable for high-side current sensing in automotive and industrial systems. The AD820ARZ, as a general-purpose op amp, has a common-mode input range limited to its supply rails (typically within the 5 V to 36 V supply range) and is not specified for operation with inputs far beyond its supply rails.
What is the fixed gain of the AD8206WHRZ and how does it differ from the AD820ARZ?
The AD8206WHRZ has a factory-set gain of 20 V/V, eliminating the need for external gain-setting resistors. The AD820ARZ is an uncompensated-gain operational amplifier whose gain is set by external feedback resistors, allowing user-defined gain but requiring additional components and layout considerations.
Are both devices qualified for automotive applications?
The AD8206WHRZ is specified for operation over the -40°C to +125°C temperature range and is offered in an SOIC package; however, automotive qualification status should be confirmed against the specific manufacturer datasheet and qualification report. The AD820ARZ is specified for the -40°C to +85°C industrial temperature range and is not presented as an automotive-qualified part in its standard datasheet. Designers should verify AEC-Q100 status directly with the manufacturer for any automotive use.
What are the typical supply voltage requirements for each device?
The AD820ARZ operates from a single supply of 5 V to 36 V or dual supplies of ±2.5 V to ±18 V. The AD8206WHRZ operates from a single supply of 4.5 V to 5.5 V, which is typical for current-sense amplifiers intended for 5 V signal-conditioning systems. The supply requirements are therefore not compatible without circuit redesign.
Which device is better suited for high-side current sensing in motor control or battery management systems?
The AD8206WHRZ is the appropriate choice for high-side current sensing because its -2 V to +65 V common-mode input range and fixed gain of 20 V/V are designed specifically for measuring current across a shunt resistor at elevated common-mode voltages. The AD820ARZ is a general-purpose op amp and would require additional external circuitry and careful level shifting to achieve comparable high-side sensing performance.