Part A
AD820BRZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 5309 PCS
- Package
- SOIC-8
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
Replacement verdict
Not a drop-in replacement
The AD820BRZ and AD8205WHRZ-RL are not functionally interchangeable. The AD820BRZ is a single-channel precision operational amplifier in an SOIC-8 package, while the AD8205WHRZ-RL is a single-supply current-sense amplifier in an SOIC-8 package with a fixed gain of 20 V/V and an extended automotive temperature 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 temperature grade
Parts at a glance
Part B
AD8205WHRZ-RL
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 2216 PCS
- Package
- SOIC-8
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
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 | AD8205WHRZ-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. |
| Input Offset Voltage (max) | ~0.8 mV (typical grade dependent) | ~1 mV | Offset voltage directly affects DC accuracy; lower offset yields more precise signal measurement in precision applications. |
| Supply Voltage Range | 4.5 V to 36 V (single supply) | 4.5 V to 5.5 V | The wider supply range of the op amp allows operation in higher-voltage systems, whereas the current sense amplifier is constrained to low-voltage rails. |
| Gain Configuration | User-configurable (external resistors) | Fixed gain (20 V/V) | A fixed-gain current sense amplifier simplifies design and ensures matched gain, while an op amp requires external components to set gain, affecting flexibility and accuracy. |
| Input Common-Mode Range | Rail-to-rail input (includes supply rails) | -2 V to +65 V (independent of supply) | The current sense amplifier supports common-mode voltages far beyond its supply, enabling high-side sensing, which a standard op amp cannot do. |
| Package | 8-lead SOIC | 8-lead SOIC | Identical package footprint allows board-level interchangeability, though electrical function still differs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature range of the current sense amplifier suits harsher automotive/industrial environments. |
| Typical Application | General-purpose signal conditioning, filters, buffers | High-side current sensing, motor control, battery monitoring | Application focus determines substitutability; the parts target different circuit roles and are not interchangeable in most designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD820BRZ | AD8205WHRZ-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 | 2.2mA |
| 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 ~ 150°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
What are the fundamental differences between the AD820BRZ and the AD8205WHRZ-RL?
The AD820BRZ is a single, precision, low-power, JFET-input operational amplifier in an 8-lead SOIC package. The AD8205WHRZ-RL is a single-supply, 40 V, high-side current sense amplifier in an 8-lead SOIC package. They are functionally different devices: one is a general-purpose op amp, and the other is a dedicated current-sense amplifier.
Can the AD820BRZ be used as a direct replacement for the AD8205WHRZ-RL?
No. The AD820BRZ is a general-purpose operational amplifier, while the AD8205WHRZ-RL is a high-side current sense amplifier with a fixed gain of 20 V/V and an integrated resistor network. Their pin functions and internal architectures differ, so they are not pin-for-pin or function-for-function interchangeable.
What are the key electrical specifications of the AD820BRZ?
The AD820BRZ is a single JFET-input op amp with a typical input bias current of 2 pA, a typical input offset voltage of 100 µV, a gain bandwidth product of 1.8 MHz, and a typical slew rate of 3 V/µs. It operates on a single supply from 5 V to 36 V or a dual supply of ±2.5 V to ±18 V.
What are the key electrical specifications of the AD8205WHRZ-RL?
The AD8205WHRZ-RL is a high-side current sense amplifier with a fixed gain of 20 V/V, a common-mode input voltage range from −2 V to +65 V, and a typical input offset voltage of 1 mV. It operates from a single supply of 4.5 V to 5.5 V and is specified over the −40 °C to +125 °C temperature range.
Do the AD820BRZ and AD8205WHRZ-RL share the same package and pinout?
Both devices are offered in an 8-lead SOIC package, but their pinouts are not identical. The AD820BRZ uses the standard single op amp pinout (offset null, −IN, +IN, V−, NC, OUT, V+, NC), while the AD8205WHRZ-RL uses a current-sense amplifier pinout with dedicated +IN, −IN, V+, V−, and output pins. PCB layouts must be designed for the specific device.
Which device is better suited for high-side current sensing applications?
The AD8205WHRZ-RL is specifically designed for high-side current sensing, featuring a wide 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 would require external precision resistors and additional design effort to implement high-side current sensing, making the AD8205WHRZ-RL the appropriate choice for that function.
What are the operating temperature ranges for the AD820BRZ and AD8205WHRZ-RL?
The AD820BRZ is specified over the −40 °C to +85 °C industrial temperature range. The AD8205WHRZ-RL is specified over the −40 °C to +125 °C temperature range, making it suitable for higher-temperature automotive and industrial applications.