Part A
AD820BRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5309 ПКС
- Package
- SOIC-8
- Series
- Линейные - Усилетели - Приборы, ОП Усилетели, Буферные Усилетели
Replacement verdict
Not a drop-in replacement
The AD820BRZ and AD8205WYRZ-RL are not functionally interchangeable. The AD820BRZ is a single-channel precision operational amplifier in an SOIC-8 package, while the AD8205WYRZ-RL is a single-supply current-sense amplifier in an SOIC-8 package with a fixed gain of 20 V/V and an extended common-mode input range. Their differing amplifier topologies, gain configurations, and input common-mode capabilities make direct substitution impractical without circuit redesign.
Different amplifier topology
Different gain configuration
Different input common-mode range
Different application intent
Parts at a glance
Part B
AD8205WYRZ-RL
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2048 ПКС
- Package
- SOIC-8
- Series
- Линейные - Усилетели - Приборы, ОП Усилетели, Буферные Усилетели
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 | AD8205WYRZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Single-supply operational amplifier (op amp) | Current sense amplifier | The two parts serve fundamentally different functions; an op amp is a general-purpose building block while a current sense amplifier is purpose-built for measuring current across a shunt, so they are not direct substitutes. |
| Number of Channels | 1 | 1 | Both are single-channel devices, so channel count alone does not differentiate them, but it confirms neither offers multi-channel integration. |
| Supply Voltage Range | 4.5 V to 36 V (single supply) | 4.5 V to 5.5 V | The AD820BRZ tolerates a much wider supply range, making it suitable for higher-voltage systems, whereas the AD8205WYRZ-RL is limited to a narrow 5 V-class supply. |
| Input Offset Voltage | Max 1 mV (typical 0.4 mV) | Max 1 mV | Offset voltage directly affects DC accuracy; both are precision-grade, but the AD820BRZ specifies a tighter typical value useful for low-error signal chains. |
| Gain Configuration | User-configurable (external resistors) | Fixed gain of 50 V/V | The AD820BRZ allows arbitrary closed-loop gain via external feedback, while the AD8205WYRZ-RL has a fixed gain of 50, so circuit topology and gain requirements dictate which can be used. |
| Input Common-Mode Range | Rail-to-rail input (includes supply rails) | -2 V to +65 V (independent of supply) | The AD8205WYRZ-RL supports common-mode voltages far beyond its supply, essential for high-side current sensing, whereas the AD820BRZ is limited to its rail-to-rail input window. |
| Package | 8-lead SOIC (R-8) | 8-lead SOIC (R-8) | Identical package and pin count simplify PCB footprint reuse, though pin functions differ between the two devices. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The AD8205WYRZ-RL is rated for a wider automotive-grade temperature range, making it preferable for harsh-environment applications. |
| Bandwidth | 1.9 MHz (typical, G = +1) | 100 kHz (typical) | The AD820BRZ offers much higher bandwidth for general signal conditioning, while the AD8205WYRZ-RL bandwidth is tailored to current-sense loop dynamics. |
| Qualification / Grade | Industrial grade | Automotive grade (AEC-Q100) | The AD8205WYRZ-RL carries automotive qualification, which is a hard requirement for automotive designs and not met by the industrial-grade AD820BRZ. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD820BRZ | AD8205WYRZ-RL |
|---|---|---|
| Supplier | - | 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 | - | 50 kHz |
| Voltage - Input Offset | 300 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 | 1.9 MHz | - |
| Current - Input Bias | 2 pA | - |
| Current - Output / Channel | 20 mA | - |
Frequently asked questions
Are the AD820BRZ and AD8205WYRZ-RL interchangeable in the same circuit?
No. The AD820BRZ is a single-channel, general-purpose precision operational amplifier, while the AD8205WYRZ-RL is a single-supply, bidirectional current-sense amplifier with a fixed gain of 20 V/V. Their functions, pinouts, and transfer characteristics differ, so they are not direct substitutes.
What are the key functional differences between the AD820BRZ and AD8205WYRZ-RL?
The AD820BRZ is a low-power, rail-to-rail output op amp intended for signal conditioning and general amplification. The AD8205WYRZ-RL is a dedicated high-side current-sense amplifier that converts a differential shunt voltage into a scaled output, with an input common-mode range extending from -2 V to +65 V and a fixed gain of 20.
Do the AD820BRZ and AD8205WYRZ-RL use the same package and pinout?
No. The AD820BRZ is supplied in an 8-lead SOIC package, while the AD8205WYRZ-RL is supplied in an 8-lead SOIC package as well, but the pin functions are not identical because the AD8205 is a current-sense amplifier with dedicated +IN, -IN, and output pins. Pin-to-pin compatibility must be verified against the respective datasheets before substitution.
What is the supply voltage range for each device?
The AD820BRZ operates from a single supply of 5 V to 36 V or a dual supply of ±2.5 V to ±18 V. The AD8205WYRZ-RL operates from a single supply of 4.5 V to 5.5 V, making it suitable for 5 V current-sensing applications.
Which device is appropriate for high-side current sensing?
The AD8205WYRZ-RL is the appropriate choice for high-side current sensing because it is purpose-built for that function, with a common-mode input range of -2 V to +65 V and a fixed gain of 20 V/V. The AD820BRZ is a general-purpose op amp and is not specified for high-side current-sense operation.
How do the input offset voltage specifications compare?
The AD820BRZ has a maximum input offset voltage of 1 mV at 25°C. The AD8205WYRZ-RL has a maximum input offset voltage of 2 mV at 25°C. These values should be considered when evaluating measurement accuracy in the target application.
Can the AD8205WYRZ-RL be used as a general-purpose operational amplifier?
No. The AD8205WYRZ-RL is a fixed-gain current-sense amplifier with a gain of 20 V/V and a limited supply range of 4.5 V to 5.5 V. It is not intended for general-purpose op amp applications where variable gain, wide supply range, or rail-to-rail input/output operation is required.
What are the operating temperature ranges for the AD820BRZ and AD8205WYRZ-RL?
Both the AD820BRZ and AD8205WYRZ-RL are specified for operation over the industrial temperature range of -40°C to +125°C, as stated in their respective manufacturer datasheets.