Part A
AD8552AR
ADI公司
- Lifecycle
- Active
- Stock
- 4828 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Not a drop-in replacement
The AD8552AR and AD8555ARZ are not drop-in replacements for one another. Although both are zero-drift operational amplifiers in SOIC-8 packages, the AD8555ARZ integrates a programmable gain instrumentation amplifier architecture with digital gain and offset trimming, while the AD8552AR is a fixed-gain dual op-amp. The differing channel count, programmable gain function, and output configuration make direct substitution impractical without circuit redesign.
Different channel count
Different gain architecture
Different output configuration
Different programming interface
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8552AR | AD8555ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (dual) | 1 (single, with programmable gain) | Channel count determines how many independent signal paths can be processed; a dual cannot directly replace a single-channel programmable part in multi-channel designs. |
| Input Offset Voltage (max) | 5 µV | 10 µV | Offset voltage sets the DC accuracy floor; lower offset yields better precision in low-level signal conditioning. |
| Gain Configuration | Fixed (unity-gain stable op amp) | Digitally programmable gain (via SPI) | A programmable-gain amplifier offers adjustable closed-loop gain in-system, whereas a fixed op amp requires external resistors, affecting substitutability. |
| Input Bias Current (typ) | ~50 pA | ~50 pA | Very low bias current minimizes errors in high-impedance sensor interfaces; comparable values support similar precision applications. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges allow both parts to operate from the same low-voltage rails, easing board-level substitution. |
| Gain Bandwidth Product | 1.5 MHz | ~1 MHz (varies with gain) | Bandwidth limits the maximum signal frequency; differing values affect dynamic performance in the target circuit. |
| Package | 8-lead SOIC | 8-lead SOIC | Identical package footprint enables drop-in board placement, though pin functions differ between the two parts. |
| Digital Interface | None (analog only) | SPI-compatible serial interface | The programmable part requires a digital control bus for gain setting, which the fixed op amp lacks, impacting system architecture compatibility. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Equivalent temperature ratings ensure both parts meet the same environmental requirements for industrial and automotive use. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8552AR | AD8555ARZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | DigiTrim® |
| Part Status | Obsolete | Active |
| Amplifier Type | Zero-Drift | Zero-Drift |
| Number of Circuits | 2 | 1 |
| Slew Rate | 0.4V/µs | 1.2V/µs |
| Gain Bandwidth Product | 1.5 MHz | 2 MHz |
| Current - Input Bias | 10 pA | 16 nA |
| Voltage - Input Offset | 1 µV | 2 µV |
| Supply Current | 850µA (x2 Channels) | 2mA |
| Current - Output / Channel | 30 mA | 10 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | Rail-to-Rail | - |
Frequently asked questions
What are the fundamental differences between the AD8552AR and AD8555ARZ?
The AD8552AR is a dual-channel zero-drift operational amplifier in an 8-lead SOIC package, while the AD8555ARZ is a single-channel digitally programmable sensor signal amplifier with programmable gain and offset in an 8-lead SOIC package. They serve different functions: the AD8552AR is a general-purpose dual op amp, whereas the AD8555ARZ is a specialized sensor interface amplifier with digital programmability.
Are the AD8552AR and AD8555ARZ pin-compatible?
No. Although both are offered in 8-lead SOIC packages, their pin functions differ. The AD8552AR uses a standard dual op amp pinout (two amplifiers with shared power pins), while the AD8555ARZ has a different pin assignment supporting its programmable gain/offset architecture and digital interface. They are not direct drop-in replacements.
Can the AD8555ARZ replace the AD8552AR in an existing dual-amplifier circuit?
No. The AD8555ARZ is a single-channel programmable sensor amplifier, not a dual op amp. It cannot substitute for the AD8552AR in circuits requiring two independent operational amplifiers, and its pinout and function differ. Replacement requires design changes and validation against the AD8555ARZ datasheet.
What are the key specifications of the AD8552AR?
The AD8552AR is a dual zero-drift operational amplifier featuring very low offset voltage (typically a few microvolts), low offset voltage drift, rail-to-rail input and output, and low noise. It operates from a single supply of 2.7 V to 5 V and is specified over the extended industrial temperature range. Exact limits should be confirmed from the Analog Devices AD8552 datasheet.
What are the key specifications of the AD8555ARZ?
The AD8555ARZ is a single-channel digitally programmable sensor signal amplifier with programmable gain and output offset, designed for bridge and sensor signal conditioning. It includes a digital interface for gain and offset adjustment and operates from a single supply. Exact gain ranges, offset ranges, and electrical limits should be verified from the Analog Devices AD8555 datasheet.
Do both parts share the same supply voltage range?
Both devices are designed for single-supply operation in the low-voltage range typical of precision signal conditioning, but the exact specified supply ranges differ and must be confirmed individually from the respective Analog Devices datasheets. Do not assume identical supply limits without verification.
Which part is better suited for bridge sensor signal conditioning?
The AD8555ARZ is specifically designed for sensor signal conditioning, offering digitally programmable gain and offset to accommodate bridge sensor variations. The AD8552AR is a general-purpose dual zero-drift op amp that can be used in signal chains but lacks the integrated programmability of the AD8555ARZ. Selection depends on whether digital calibration and single-channel sensor interfacing are required.
Are both parts available in the same package type?
Both the AD8552AR and AD8555ARZ are offered in 8-lead SOIC packages, but the internal pin assignments differ due to their different functions. Package similarity does not imply interchangeability; PCB layout and pin connections must follow each device's respective datasheet.