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-REEL7 are not functionally interchangeable despite sharing the same SOIC-8 footprint and zero-drift amplifier family. The AD8555AR-REEL7 integrates digitally programmable gain and offset trimming with on-chip OTP memory, whereas the AD8552AR is a fixed-gain dual operational amplifier. Circuit designs requiring programmable signal conditioning cannot substitute the AD8552AR without redesigning the gain and calibration path, and the AD8555AR-REEL7 cannot serve as a direct dual-channel drop-in for the AD8552AR.
Different amplifier function
Different channel count
Programmable gain vs fixed gain
Different calibration architecture
Parts at a glance
Part B
AD8555AR-REEL7
ADI公司
- Lifecycle
- Active
- Stock
- 3569 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
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-REEL7 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (dual) | 1 (single, with programmable gain) | Determines channel count; a dual op-amp cannot directly replace a single programmable-gain amplifier in a one-channel signal chain without redesign. |
| Amplifier Type / Architecture | Zero-drift, rail-to-rail input/output operational amplifier | Zero-drift, digitally programmable gain instrumentation amplifier | The AD8555 integrates programmable gain and differential input, while the AD8552 is a fixed-gain op-amp; functional substitutability is limited. |
| Input Offset Voltage (max) | 5 µV | 10 µV | Offset voltage directly affects DC accuracy; lower offset is preferable for precision sensor interfaces. |
| Gain Configuration | Fixed by external resistors | Digitally programmable (pin/SPI-selectable gain) | Programmable gain allows software calibration and range switching, which the AD8552 cannot provide without external circuitry. |
| 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, so power-supply compatibility is maintained. |
| Input Bias Current (typ) | ~50 pA | ~50 pA | Very low bias current suits high-impedance sensors; matching values indicate similar input loading behavior. |
| Package | 8-lead SOIC | 8-lead SOIC | Identical package footprint allows board-level drop-in compatibility, though pin functions differ. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Equivalent temperature ratings ensure both parts suit industrial and automotive environments. |
| Output Type | Rail-to-rail | Rail-to-rail | Rail-to-rail output maximizes dynamic range for low-voltage supplies in both devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8552AR | AD8555AR-REEL7 |
|---|---|---|
| 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-REEL7?
The AD8552AR is a dual-channel zero-drift operational amplifier, while the AD8555AR-REEL7 is a single-channel digitally programmable sensor signal amplifier with a programmable gain instrumentation amplifier architecture. The AD8552AR provides two independent op-amps in one package, whereas the AD8555AR integrates a programmable gain stage, output offset adjustment, and a second-order low-pass filter in a single channel.
Are the AD8552AR and AD8555AR-REEL7 pin-compatible?
No. The AD8552AR is supplied in an 8-lead SOIC package with a standard dual op-amp pinout, while the AD8555AR-REEL7 is supplied in an 8-lead SOIC package with a different pin function assignment that includes digital programming and filter pins. The two devices are not pin-compatible and cannot be interchanged on the same PCB land pattern without redesign.
What is the supply voltage range for each device?
Both the AD8552AR and AD8555AR-REEL7 operate from a single supply voltage of 2.7 V to 5.5 V. This allows both parts to be used in low-voltage, battery-powered signal conditioning applications within that range.
How does the input offset voltage performance compare between the two parts?
The AD8552AR features a maximum input offset voltage of 5 µV with a typical offset drift of 0.005 µV/°C. The AD8555AR-REEL7 specifies a maximum input offset voltage of 10 µV with a typical offset drift of 0.03 µV/°C. Both are zero-drift architectures, but the AD8552AR offers tighter offset and drift specifications.
Can the AD8555AR-REEL7 gain be programmed digitally, and does the AD8552AR offer this feature?
Yes, the AD8555AR-REEL7 includes a digitally programmable gain stage that can be set from 70 to 1280 via a serial interface. The AD8552AR does not have programmable gain; it is a fixed-gain operational amplifier whose closed-loop gain is set by external feedback resistors.
What are the typical applications for each device?
The AD8552AR is typically used in precision signal conditioning, low-level sensor amplification, and medical instrumentation where two independent zero-drift op-amps are required. The AD8555AR-REEL7 is typically used in bridge sensor signal conditioning, pressure and load cell interfaces, and programmable gain instrumentation systems where digital gain and offset calibration are needed.
What is the package and packaging difference between the AD8552AR and AD8555AR-REEL7?
Both devices are offered in an 8-lead SOIC package. The AD8552AR is typically supplied in tube or standard reel packaging, while the AD8555AR-REEL7 suffix indicates tape-and-reel packaging with a 7-inch reel for automated assembly. The package body dimensions are the same SOIC-8 outline, but pin functions differ as noted above.
Do both parts support operation over the extended industrial temperature range?
Yes. Both the AD8552AR and AD8555AR-REEL7 are specified for operation over the extended industrial temperature range of −40°C to +125°C, making them suitable for industrial and automotive-adjacent signal conditioning environments within that range.