Part A
AD820ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7301 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Not a drop-in replacement
The AD820ARZ and AD8205WYRZ-RL are not functionally interchangeable: the AD820ARZ is a single-channel general-purpose operational amplifier in an SOIC-8 package, while the AD8205WYRZ-RL is a dedicated high-voltage current-sense amplifier in an SOIC-8 package with a fixed gain of 20 V/V and a much wider common-mode input range. Their differing amplifier architecture, gain configuration, and input common-mode capabilities make direct substitution impractical without circuit redesign.
Different amplifier function
Different gain configuration
Different input common-mode range
Different application role
Parts at a glance
Part B
AD8205WYRZ-RL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2048 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
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 | AD8205WYRZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Single, precision, low power JFET-input op amp | 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 difference amplifier, so they are not directly substitutable. |
| Number of Channels | 1 | 1 | Both are single-channel devices, so channel count alone does not differentiate them. |
| Input Offset Voltage (max) | 0.8 mV | 2 mV | Lower offset voltage improves DC accuracy in precision signal-conditioning applications. |
| Input Bias Current (typ) | 2 pA | - | Very low JFET input bias current makes the AD820 suitable for high-impedance sources; the difference amplifier architecture has different input characteristics. |
| Gain Bandwidth Product | 1.8 MHz | - | GBW determines the closed-loop bandwidth achievable; the difference amplifier is specified by fixed gain and bandwidth rather than GBW. |
| Supply Voltage Range | 4.5 V to 36 V (single) / ±2.25 V to ±18 V (dual) | 4.5 V to 5.5 V | The AD820 supports a much wider supply range, while the AD8205 is optimized for 5 V systems. |
| Common-Mode Input Voltage Range | Rail-to-rail input (within supply rails) | -2 V to +65 V (independent of supply) | The AD8205 can sense voltages far beyond its own supply, which is essential for high-side current sensing; the AD820 cannot. |
| Fixed Gain | Configurable (external feedback) | 20 V/V | The AD8205 has a fixed gain of 20 for current-sense applications, whereas the AD820 gain is set by the user's external network. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature range of the AD8205W makes it suitable for automotive and harsh-environment applications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pin count allow board-level compatibility, though pin functions differ between the two devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD820ARZ | 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 | 1.9 MHz | 50 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
Are the AD820ARZ and AD8205WYRZ-RL interchangeable in the same circuit?
No. The AD820ARZ 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, internal architecture, and pinouts differ, so they are not direct substitutes.
What are the key functional differences between the AD820ARZ and AD8205WYRZ-RL?
The AD820ARZ 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 designed to measure current across a shunt resistor with a fixed gain of 20 V/V and an extended common-mode input range.
Do the AD820ARZ and AD8205WYRZ-RL use the same package and pinout?
No. The AD820ARZ is supplied in an 8-lead SOIC package, and the AD8205WYRZ-RL is supplied in an 8-lead SOIC package as well, but the pin functions are not identical because the devices serve different functions. The AD8205WYRZ-RL pinout is dedicated to current-sense operation, so PCB layouts are not directly interchangeable.
What is the supply voltage range for each device?
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 AD8205WYRZ-RL operates from a single supply of 4.5 V to 5.5 V, as it is optimized for 5 V current-sensing applications.
What is the fixed gain of the AD8205WYRZ-RL, and does the AD820ARZ have a comparable fixed gain?
The AD8205WYRZ-RL has a factory-set gain of 20 V/V. The AD820ARZ is an uncompensated op amp whose gain is set externally by the user's feedback network, so it does not have a comparable fixed gain.
Which device is better suited for high-side current sensing?
The AD8205WYRZ-RL is specifically designed for high-side current sensing with an extended common-mode input range and a fixed gain of 20 V/V. The AD820ARZ is a general-purpose op amp and is not optimized for high-side current-sense applications.
Are the operating temperature ranges of the AD820ARZ and AD8205WYRZ-RL the same?
Both devices are specified for the industrial temperature range of −40°C to +125°C, so their rated operating temperature ranges are the same.
Can the AD8205WYRZ-RL be used as a general-purpose op amp like the AD820ARZ?
No. The AD8205WYRZ-RL is a dedicated current-sense amplifier with a fixed gain of 20 V/V and a limited supply range of 4.5 V to 5.5 V, so it is not intended for general-purpose op amp applications. The AD820ARZ is the appropriate choice for general signal conditioning.