Part A
AD8056AR
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7003 PCS
- Package
- SOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8055ARZ and AD8056AR are both high-speed voltage-feedback operational amplifiers from the same Analog Devices AD805x family, sharing identical supply voltage ranges, similar bandwidth and slew rate characteristics, and the same SOIC-8 package. The primary distinction is channel count: the AD8055ARZ is a single-channel device while the AD8056AR is a dual-channel device. For single-channel applications, the AD8056AR can serve as a functional substitute by using only one of its two amplifiers, provided the additional channel's power and layout considerations are accounted for. Designers should validate pinout mapping and unused-channel termination before committing to substitution.
Channel Count
Validation required
Package Type
High match
Supply Voltage Range
High match
Bandwidth and Slew Rate
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8055ARZ | AD8056AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 2 | Determines how many independent signal channels are available in a single package; a dual amplifier can replace two singles but not vice versa without layout changes. |
| Package / Mounting Type | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Both share the same 8-lead SOIC footprint, but pinouts differ between single and dual configurations, affecting direct board substitution. |
| -3 dB Bandwidth | 300 MHz | 300 MHz | Sets the maximum usable signal frequency; matching bandwidth ensures comparable high-frequency performance in the target circuit. |
| Slew Rate | 1400 V/µs | 1400 V/µs | Governs how fast the output can respond to large signal steps; identical slew rate preserves transient response behavior. |
| Supply Voltage Range | ±5 V to ±12 V (dual) / 10 V to 24 V (single) | ±5 V to ±12 V (dual) / 10 V to 24 V (single) | Defines the operating voltage window; matching ranges allow use in the same power supply architecture. |
| Input Offset Voltage (max) | 5 mV | 5 mV | Affects DC accuracy; equal offset specifications mean comparable precision in DC-coupled applications. |
| Quiescent Supply Current per Amplifier | 5.4 mA | 5.4 mA | Impacts power budget; identical per-amplifier current draw keeps thermal and power considerations consistent. |
| Output Current | 60 mA | 60 mA | Determines drive capability for loads; matching output current supports similar load-driving applications. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies environmental limits; identical ranges ensure equivalent reliability across the same operating conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8056AR | AD8055ARZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 2 | 1 |
| Slew Rate | 1400V/µs | 1400V/µs |
| -3 dB Bandwidth | 300 MHz | 300 MHz |
| Current - Input Bias | 400 nA | 400 nA |
| Voltage - Input Offset | 3 mV | 3 mV |
| Supply Current | 10mA | 5.4mA |
| Current - Output / Channel | 60 mA | 60 mA |
| Voltage - Supply Span(Min) | 8 V | 8 V |
| Voltage - Supply Span(Max) | 12 V | 12 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8055ARZ and AD8056AR?
The AD8055ARZ is a single-channel, low-power, high-speed voltage feedback amplifier, while the AD8056AR is a dual-channel version of the same amplifier family. Both are fabricated on Analog Devices' proprietary high-speed complementary bipolar process and share similar AC performance characteristics, but the AD8056AR integrates two independent amplifiers in one package, making it suitable for dual-channel or differential signal processing applications.
Are the AD8055ARZ and AD8056AR pin-compatible?
No. The AD8055ARZ is a single amplifier in an 8-lead SOIC package, while the AD8056AR is a dual amplifier in an 8-lead SOIC package. Although both use the same package footprint, the pin functions differ because the AD8056AR uses the 8 pins to accommodate two amplifiers, whereas the AD8055ARZ uses them for one amplifier with additional supply and disable pins. They are not direct drop-in replacements for each other.
Do the AD8055ARZ and AD8056AR have the same bandwidth and slew rate specifications?
Yes, both devices share similar AC performance. The AD8055ARZ and AD8056AR each offer a -3 dB bandwidth of 300 MHz (G = +1) and a slew rate of 1400 V/µs. These specifications are consistent across both the single and dual versions because they use the same core amplifier design and process technology.
What are the supply voltage and power consumption differences between the two parts?
Both the AD8055ARZ and AD8056AR operate from dual supplies of ±5 V (or single supply of 10 V) and are specified over the industrial temperature range of -40°C to +85°C. The AD8055ARZ typically draws approximately 5.4 mA per amplifier, while the AD8056AR, containing two amplifiers, typically draws approximately 10.8 mA total. The AD8055ARZ also includes a disable feature that reduces supply current to approximately 0.8 mA when asserted.
Can the AD8056AR be used as a replacement for two AD8055ARZ devices in a design?
Functionally, the AD8056AR provides two amplifiers with performance equivalent to the AD8055ARZ, so it can replace two single amplifiers in many applications. However, the AD8055ARZ includes a disable pin that allows power-down operation, which the AD8056AR does not offer. Additionally, PCB layout, pinout, and thermal considerations must be revalidated because the package pin assignments differ between the single and dual versions.
What are the typical applications for the AD8055ARZ and AD8056AR?
Both amplifiers are suited for high-speed signal processing applications such as video line drivers, ADC input buffers, active filters, and professional camera systems. The AD8055ARZ is preferred where a single amplifier with a power-down feature is needed, while the AD8056AR is used in dual-channel or differential signal chains where board space and component count are critical.
Are the AD8055ARZ and AD8056AR RoHS compliant?
Yes. The "Z" suffix in AD8055ARZ indicates a RoHS-compliant, lead-free package per Analog Devices' nomenclature. The AD8056AR is also available in RoHS-compliant packaging; however, designers should verify the specific ordering code and package suffix on the manufacturer datasheet to confirm compliance for the exact variant used in production.