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 AD8555AR are not functionally interchangeable despite sharing the same SOIC-8 footprint and zero-drift amplifier family. The AD8555AR integrates a digitally programmable gain and offset trim network with on-chip OTP memory, whereas the AD8552AR is a fixed-gain dual operational amplifier. This architectural divergence in programmability, channel count, and output configuration makes direct substitution impractical without circuit redesign.
Different channel count
Different programmability
Different output configuration
Different supply range
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 | AD8555AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (dual) | 1 (single, with programmable gain) | Determines channel count per package; a dual cannot directly replace a single-channel design without layout changes. |
| Input Offset Voltage (max) | 5 µV | 10 µV | Ultra-low offset is critical for precision DC signal conditioning; both are excellent but differ in guaranteed limit. |
| Gain Configuration | Fixed (unity-gain stable op amp) | Digitally programmable gain (via SPI) | The AD8555 integrates a programmable gain stage, enabling software-adjustable amplification that the fixed-gain AD8552 cannot provide. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both operate over the same low-voltage range, supporting battery-powered and 3 V/5 V systems. |
| Input Bias Current (typ) | ~50 pA | ~50 pA | Very low bias current suits high-impedance sensor interfaces; equivalent performance between the two. |
| Gain Bandwidth Product | 1.5 MHz | ~1 MHz (varies with programmed gain) | Affects achievable closed-loop bandwidth; the AD8555 bandwidth depends on the selected gain setting. |
| Digital Interface | None (analog only) | SPI-compatible serial interface | The AD8555 requires a digital control bus for gain programming, adding firmware and pin requirements absent in the AD8552. |
| Package | 8-lead SOIC | 8-lead SOIC | Same footprint package allows board-level drop-in consideration, though pin functions differ. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial/extended temperature ratings support use in harsh environments for both parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8552AR | AD8555AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | DigiTrim® |
| Part Status | Obsolete | Obsolete |
| Amplifier Type | Zero-Drift | Chopper (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 primary functional differences between the AD8552AR and AD8555AR?
The AD8552AR is a dual-channel zero-drift operational amplifier, while the AD8555AR is a single-channel digitally programmable sensor signal amplifier with a programmable gain instrumentation amplifier architecture. The AD8552AR provides two independent op-amps in a single package, whereas the AD8555AR integrates a programmable gain front end with digital trimming capability for sensor interfacing.
Are the AD8552AR and AD8555AR pin-compatible?
No. The AD8552AR is supplied in an 8-lead SOIC package with a standard dual op-amp pinout, while the AD8555AR is supplied in a 16-lead SOIC package with a different pin configuration that includes digital programming and gain-setting pins. They are not pin-compatible and cannot be interchanged on the same PCB footprint.
What is the input offset voltage performance of each device?
The AD8552AR features a maximum input offset voltage of 5 µV with zero-drift architecture, while the AD8555AR specifies a maximum input offset voltage of 10 µV. Both devices are designed for precision DC applications requiring low offset and low drift over temperature.
Can the AD8555AR be used as a direct replacement for the AD8552AR in a dual op-amp circuit?
No. The AD8555AR is a single-channel programmable gain amplifier with a different internal architecture, pinout, and package. It cannot directly replace the dual AD8552AR in circuits designed for two independent op-amps. A redesign of the circuit and PCB layout would be required.
What are the supply voltage ranges for the AD8552AR and AD8555AR?
Both the AD8552AR and AD8555AR operate from a single supply voltage range of 2.7 V to 5.5 V, or from dual supplies of ±1.35 V to ±2.75 V. This makes both devices suitable for low-voltage precision signal conditioning applications.
How does the gain configuration differ between the AD8552AR and AD8555AR?
The AD8552AR is a fixed-gain operational amplifier whose closed-loop gain is set by external feedback resistors. The AD8555AR features digitally programmable gain settings that are configured through its digital interface, allowing gain adjustment without external resistor changes, which is advantageous for sensor calibration and trimming applications.
What are the typical applications for each device?
The AD8552AR is typically used in precision signal conditioning, low-level transducer amplification, and dual-channel instrumentation circuits. The AD8555AR is intended for sensor signal amplification with programmable gain, such as pressure sensor interfaces, load cell amplification, and systems requiring digital gain calibration and trimming.