Part A
AD811JRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2965 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker für Video-Verstärker und Module
Replacement verdict
Compatible functional replacement candidate
The AD811JRZ and AD811AR-20 share the same high-speed current-feedback operational amplifier core, making them functionally interchangeable in most video and signal-processing designs. The AD811AR-20 offers the tighter grade with superior differential gain and phase performance, while the AD811JRZ provides a commercial-grade alternative in a different package. Designers should confirm package footprint and thermal layout before substituting, but the electrical function is fundamentally equivalent.
Amplifier Function
High match
Package Type
Validation required
Bandwidth
High match
Grade and Temperature Range
Validation required
Parts at a glance
Part B
AD811AR-20
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4567 Stückzahl
- Package
- SOIC-20
- Series
- Linear-Verstärker für Video-Verstärker und Module
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD811JRZ | AD811AR-20 | Why it matters |
|---|---|---|---|
| Package / Mounting Type | 8-Lead SOIC (surface mount) | 20-Lead SOIC (surface mount) | Different package footprints are not drop-in compatible; the PCB land pattern must match the package. |
| Number of Amplifiers | 1 | 1 | Both are single amplifiers, so channel count is equivalent for circuit design. |
| -3 dB Bandwidth | 140 MHz (G = +2) | 140 MHz (G = +2) | Bandwidth determines the maximum signal frequency the amplifier can pass with acceptable gain. |
| Slew Rate | 2500 V/µs | 2500 V/µs | Slew rate limits how fast the output can change, affecting large-signal and pulse performance. |
| Supply Voltage Range | ±4.5 V to ±18 V (dual) | ±4.5 V to ±18 V (dual) | The supply range must match the system rails to ensure proper operation and headroom. |
| Input Offset Voltage (max) | 3 mV | 3 mV | Offset voltage affects DC accuracy; matching values means comparable DC error behavior. |
| Operating Temperature Range | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | The industrial grade supports wider ambient conditions, which matters for harsh-environment applications. |
| Output Current (typ) | 100 mA | 100 mA | Output drive capability determines the load the amplifier can drive, such as cables or low-impedance loads. |
| Quiescent Supply Current (typ) | 16 mA | 16 mA | Quiescent current impacts power budget and thermal design in the target system. |
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 | AD811JRZ | AD811AR-20 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Applications | Current Feedback | Current Feedback |
| Number of Circuits | 1 | 1 |
| -3 dB Bandwidth | 140 MHz | 140 MHz |
| Slew Rate | 2500V/µs | 2500V/µs |
| Supply Current | 16.5 mA | 16.5 mA |
| Current - Output / Channel | 100 mA | 100 mA |
| Voltage - Supply, Single/Dual (±) | ±4.5V ~ 18V | ±4.5V ~ 18V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD811JRZ and AD811AR-20?
The AD811JRZ is the AD811 current-feedback operational amplifier supplied in an 8-lead SOIC package (R-8 suffix) and specified for the commercial temperature range of 0°C to +70°C. The AD811AR-20 is the same AD811 die in a 20-lead SOIC_W package (R-20 suffix) rated for the industrial temperature range of −40°C to +85°C. The core amplifier specifications (bandwidth, slew rate, output current) are common to both; the differences are package, pin count, and temperature grade.
Are the AD811JRZ and AD811AR-20 electrically identical in performance?
Both parts use the same AD811 current-feedback amplifier core, so headline AC specifications such as −3 dB bandwidth (approximately 140 MHz at G = +2) and slew rate (approximately 2500 V/µs) are common to the AD811 family. However, the AD811AR-20 is specified and tested over the wider −40°C to +85°C industrial range, while the AD811JRZ is specified over 0°C to +70°C. Designers should verify the guaranteed limits at their operating temperature against the respective datasheet tables rather than assuming identical guaranteed limits.
Can the AD811JRZ be used as a drop-in replacement for the AD811AR-20?
No, not as a direct drop-in. The AD811JRZ is an 8-lead SOIC device and the AD811AR-20 is a 20-lead SOIC_W device, so the package footprints, pin counts, and PCB land patterns differ. In addition, the temperature grades differ (0°C to +70°C versus −40°C to +85°C). A replacement requires a board redesign for the different package and verification that the commercial temperature grade meets the application's environmental requirements.
Why would a design choose the AD811AR-20 over the AD811JRZ?
The AD811AR-20 is specified over the industrial temperature range of −40°C to +85°C, making it suitable for applications exposed to wider ambient temperature extremes, whereas the AD811JRZ is limited to 0°C to +70°C. The 20-lead SOIC_W package also provides additional pins and a different thermal/mechanical footprint. Selection should be based on the required operating temperature range and the board's package compatibility.
What is the primary application of the AD811 amplifier family?
The AD811 is a high-speed current-feedback operational amplifier intended for video and high-speed signal processing applications, including video distribution, RGB buffering, and professional video systems. Its high slew rate and wide bandwidth suit it to driving cables and fast analog signal chains. Both the AD811JRZ and AD811AR-20 share this application profile, with the choice driven by package and temperature grade.
Do both parts share the same supply voltage and output drive specifications?
Yes. As members of the same AD811 family, both the AD811JRZ and AD811AR-20 operate from ±5 V to ±15 V dual supplies and provide high output current drive (on the order of 100 mA class) suitable for cable driving. Because guaranteed limits can differ by temperature grade, the applicable datasheet for each orderable part number should be consulted for the exact specified limits over its rated temperature range.
How should the package difference affect PCB layout and thermal design?
The AD811JRZ uses an 8-lead SOIC footprint, while the AD811AR-20 uses a 20-lead SOIC_W footprint with a larger body and additional pins. The PCB land pattern, copper area, and thermal path must be designed for the specific package. Because high-speed current-feedback amplifiers are sensitive to parasitic capacitance and trace length, layout should follow the manufacturer's recommended practices for the chosen package to preserve stability and bandwidth.