Part A
AD820BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5309 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 AD820BRZ and AD8202WYRZ-RL are not interchangeable despite sharing the AD820 family designation. The AD820BRZ is a single-channel precision operational amplifier in an 8-lead SOIC package, while the AD8202WYRZ-RL is a dedicated high-voltage difference amplifier in a 16-lead SOIC package with a fixed gain of 20 and an integrated resistor network. Their pinouts, channel architecture, gain configuration, and package footprints differ fundamentally, so the AD8202WYRZ-RL cannot be substituted for the AD820BRZ in an existing design without board redesign and circuit revalidation.
Different amplifier function
Different channel count
Different package footprint
Different gain configuration
Parts at a glance
Part B
AD8202WYRZ-RL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4239 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 | AD820BRZ | AD8202WYRZ-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 direct substitutes. |
| 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 | 1 mV | Offset voltage directly affects DC accuracy; a lower offset yields more precise signal conditioning. |
| Input Bias Current (typ) | 2 pA | - | Very low bias current is critical for high-impedance sensor interfaces; the JFET input of the AD820 offers picoamp-level bias current. |
| Gain Bandwidth Product | 1.8 MHz | - | GBW determines the usable signal bandwidth for a given closed-loop gain; the AD820 provides a defined AC performance specification. |
| Supply Voltage Range | 4.5 V to 36 V (single) / ±2.25 V to ±18 V (dual) | 3.5 V to 12 V (single) | The supply range determines compatibility with the system rail; the AD820 supports much higher supply voltages than the AD8202. |
| Common-Mode Input Range | Rail-to-rail input (to supply rails) | -6 V to +54 V (high voltage) | The AD8202 is designed to sense signals far above its own supply, which is essential for high-side current sensing, whereas the AD820 is limited to its rails. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature range of the AD8202W makes it suitable for harsher automotive and industrial environments. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Both share the same SOIC-8 footprint, which simplifies PCB layout substitution even though the electrical functions differ. |
| Qualification | Industrial grade | Automotive grade (AEC-Q100) | Automotive qualification indicates enhanced reliability and testing for mission-critical applications, which the industrial-grade AD820 does not carry. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD820BRZ | AD8202WYRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | Automotive |
| Part Status | Active | Active |
| Amplifier Type | J-FET | Differential |
| Number of Circuits | 1 | 1 |
| Slew Rate | 3V/µs | 0.28V/µs |
| Gain Bandwidth Product | 1.9 MHz | 50 kHz |
| Current - Input Bias | 2 pA | 40 nA |
| Voltage - Input Offset | 300 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 | - |
| Current - Output / Channel | 20 mA | - |
Frequently asked questions
What are the fundamental differences between the AD820BRZ and the AD8202WYRZ-RL?
The AD820BRZ is a single, precision, low-power, JFET-input operational amplifier in an 8-lead SOIC package. The AD8202WYRZ-RL is a high common-mode voltage, single-supply, differential amplifier (difference amplifier) in an 8-lead SOIC package, specified for automotive applications. They are functionally different devices and are not direct substitutes.
Are the AD820BRZ and AD8202WYRZ-RL pin-compatible?
No. Although both are offered in an 8-lead SOIC package, their pin functions differ. The AD820BRZ uses the standard single op-amp pinout (offset null, inputs, supply, output), while the AD8202WYRZ-RL uses a differential amplifier pinout with gain-setting and reference pins. The PCB land patterns are similar, but the electrical pin assignments are not interchangeable.
What is the input architecture of each device?
The AD820BRZ uses a JFET input stage, providing very low input bias current and high input impedance, making it suitable for high-impedance sensor interfacing. The AD8202WYRZ-RL uses a precision resistor network front end configured as a difference amplifier, designed to attenuate and level-shift high common-mode voltages.
Can the AD8202WYRZ-RL be used as a drop-in replacement for the AD820BRZ in a signal-conditioning circuit?
No. The AD8202WYRZ-RL is a fixed-gain difference amplifier intended for high-side current sensing and high common-mode voltage applications, whereas the AD820BRZ is a general-purpose op-amp requiring external feedback for gain setting. Circuit topology, gain, and common-mode range requirements must be re-evaluated before any substitution.
What are the supply voltage and operating temperature considerations for these parts?
The AD820BRZ operates from dual supplies (typically ±5 V to ±15 V) or a single supply, and is specified over the industrial temperature range. The AD8202WYRZ-RL operates from a single supply and is specified for automotive temperature ranges. Always confirm the exact grade and temperature range from the respective manufacturer datasheet before design release.
Which device is better suited for high-side current sensing?
The AD8202WYRZ-RL is specifically designed for high common-mode voltage, single-supply difference amplification, making it appropriate for high-side current sensing. The AD820BRZ is a general-purpose op-amp and would require additional external resistor networks and careful common-mode handling to perform the same function.
Do these devices share the same qualification or automotive certification?
No. The AD8202WYRZ-RL is offered in an automotive-qualified variant, while the AD820BRZ is a standard industrial-grade op-amp. Qualification status and certification details must be verified against the official manufacturer datasheet and product page for the specific orderable part number.