Part A
AD8554ARZ
ADI公司
- Lifecycle
- Active
- Stock
- 5191 件
- Package
- SOIC-14
- 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 AD8554ARZ and AD8555AR-REEL7 are not drop-in replacements for one another. Although both are zero-drift, rail-to-rail operational amplifiers from Analog Devices, the AD8555AR-REEL7 integrates a digitally programmable gain and offset trim network with on-chip OTP memory, whereas the AD8554ARZ is a fixed-gain quad op amp. The differing channel count, package footprint, and programmable versus fixed signal path make direct substitution impractical without circuit redesign.
Different channel count
Different package footprint
Programmable vs fixed gain
Different pin configuration
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 | AD8554ARZ | AD8555AR-REEL7 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 (quad) | 1 (single, with programmable gain) | Channel count determines how many independent signal paths can be processed; a quad and a single amplifier are not directly interchangeable 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 (external resistors) | Digitally programmable gain (pin/digital selectable) | Programmable gain allows on-the-fly scaling without external components, whereas a fixed-gain amplifier requires external resistor networks. |
| 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 supply compatibility is maintained across the two parts. |
| Input Bias Current (typ) | ~50 pA | ~50 pA | Very low bias current suits high-impedance sensor interfaces; matching values indicate similar input loading behavior. |
| Gain Bandwidth Product | 1.5 MHz | ~1.5 MHz (varies with programmed gain) | Bandwidth limits the maximum signal frequency; the programmable part's effective bandwidth depends on selected gain. |
| Package | 14-lead SOIC | 8-lead SOIC | Different package footprints and pin counts prevent direct board-level drop-in replacement. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings ensure both parts suit the same industrial-grade environments. |
| Special Features | Zero-drift, auto-zero architecture | Zero-drift, auto-zero, digitally programmable gain and offset | The programmable gain/offset of the AD8555 adds calibration flexibility not available on the fixed-gain AD8554. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8554ARZ | AD8555AR-REEL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | DigiTrim® |
| Part Status | Active | Obsolete |
| Amplifier Type | Zero-Drift | Chopper (Zero-Drift) |
| Number of Circuits | 4 | 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 (x4 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 AD8554ARZ and AD8555AR-REEL7?
The AD8554ARZ is a quad-channel zero-drift operational amplifier in a 14-lead SOIC package, while the AD8555AR-REEL7 is a single-channel digitally programmable sensor amplifier with an embedded programmable gain and offset, supplied in a 16-lead SOIC package on a 7-inch reel. They differ in channel count, function, package pinout, and intended application.
Can the AD8554ARZ be used as a direct replacement for the AD8555AR-REEL7?
No. The AD8554ARZ is a quad op amp without digital programmability, whereas the AD8555AR-REEL7 integrates a digitally programmable gain and offset stage for sensor signal conditioning. The package pinouts and functions are not compatible, so a direct substitution is not possible.
What are the package and pin count differences between these two parts?
The AD8554ARZ is supplied in a 14-lead SOIC package, while the AD8555AR-REEL7 is supplied in a 16-lead SOIC package. The additional pins on the AD8555 support its digital programming interface and sensor amplifier functions.
Do both parts share the same zero-drift amplifier technology?
Yes. Both the AD8554ARZ and AD8555AR-REEL7 are based on Analog Devices' zero-drift amplifier architecture, which provides very low offset voltage and offset drift over temperature. However, the AD8555AR-REEL7 adds digitally programmable gain and offset to the core amplifier.
Which part is intended for multi-channel signal conditioning?
The AD8554ARZ, being a quad-channel op amp, is suited for multi-channel signal conditioning where four independent low-offset amplifier channels are required. The AD8555AR-REEL7 is a single-channel programmable sensor amplifier intended for applications needing digital calibration of gain and offset.
How does the supply voltage range compare between the AD8554ARZ and AD8555AR-REEL7?
Both devices operate from a single supply in the 2.7 V to 5.5 V range, making them suitable for low-voltage systems. Designers should confirm the exact limits in the respective manufacturer datasheets for the target operating conditions.
What is the significance of the REEL7 suffix on the AD8555AR-REEL7?
The REEL7 suffix indicates that the AD8555AR-REEL7 is supplied on a 7-inch tape-and-reel carrier, which is intended for automated pick-and-place assembly. The AD8554ARZ is typically supplied in tube or tray packaging depending on the ordering option.