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 are not drop-in replacements for one another. Although both are zero-drift operational amplifiers from Analog Devices, the AD8555AR integrates a programmable gain instrumentation amplifier architecture with digital gain and offset trimming, while the AD8554ARZ is a quad precision op-amp. Their channel count, output configuration, and package footprint differ, so a direct board-level substitution is not possible without redesign.
Different channel count
Different output type
Different footprint
Different gain configuration
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 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 (quad) | 1 (single, with programmable gain) | Determines how many independent signal channels can be processed in one package; a quad vs single device is not a drop-in substitute. |
| Input Offset Voltage (max) | 10 µV | 10 µV | Ultra-low offset is critical for precision DC signal conditioning; both are zero-drift auto-zero amplifiers with comparable offset performance. |
| Gain Configuration | Fixed (unity-gain stable op amp) | Digitally programmable gain (70 to 1280) | The AD8555 integrates a programmable gain stage, allowing software-selectable gain, whereas the AD8554 requires external resistors for gain setting. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both operate from the same low-voltage single supply, enabling use in battery-powered and 3 V/5 V systems. |
| Input Bias Current (typ) | ~50 pA | ~50 pA | Very low input bias current minimizes errors in high-impedance sensor interfaces; both are CMOS auto-zero designs with similar performance. |
| Package | 14-lead SOIC | 8-lead SOIC | Different pin counts and footprints mean the two parts are not physically interchangeable on the same PCB layout. |
| Programmable Features | None (analog op amp) | Digital gain and offset programming via serial interface | The AD8555 offers in-system digital calibration of gain and offset, a key functional difference not available on the AD8554. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both are specified for industrial/extended temperature operation, suitable for harsh-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8554ARZ | AD8555AR |
|---|---|---|
| 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 the AD8555AR?
The AD8554ARZ is a quad-channel, zero-drift, rail-to-rail input/output operational amplifier in a 14-lead SOIC package. The AD8555AR is a single-channel, digitally programmable sensor signal amplifier with a programmable gain instrumentation amplifier architecture, also in an SOIC package. They differ in channel count, core function, and programmability.
Are the AD8554ARZ and AD8555AR pin-compatible or directly interchangeable?
No. The AD8554ARZ is a 14-lead SOIC quad op amp, while the AD8555AR is an 8-lead SOIC single-channel programmable amplifier. The package pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
What is the input offset voltage behavior of the AD8554ARZ?
The AD8554ARZ uses zero-drift (auto-zero) architecture with very low input offset voltage and offset drift, making it suitable for precision DC and low-frequency signal conditioning. Designers should confirm exact offset and drift limits from the Analog Devices AD8554 datasheet for the specific grade.
How does the AD8555AR differ functionally from a standard operational amplifier like the AD8554ARZ?
The AD8555AR is a digitally programmable sensor signal amplifier that integrates a programmable gain instrumentation amplifier with digital gain and offset adjustment, intended for sensor interfacing. The AD8554ARZ is a general-purpose quad zero-drift op amp requiring external feedback networks to set gain, with no digital programmability.
Can the AD8555AR be used for multi-channel signal conditioning like the AD8554ARZ?
No. The AD8555AR is a single-channel device, whereas the AD8554ARZ contains four independent op amps in one package. Multi-channel designs using the AD8555AR would require multiple devices, increasing board area and cost compared with a single AD8554ARZ.
What supply voltage ranges do these devices support?
Both devices are designed for single-supply and dual-supply operation in the low-voltage range typical of precision analog signal chains. Exact minimum and maximum supply limits, as well as rail-to-rail behavior, should be verified against the respective Analog Devices datasheets before finalizing a design.
Which device is better suited for bridge sensor applications?
The AD8555AR is specifically intended for sensor signal amplification with programmable gain and offset, which suits bridge and other sensor interfaces requiring digital calibration. The AD8554ARZ can also be used in sensor signal chains but requires external gain-setting components and offers no integrated digital programmability.
Do both parts share the same operating temperature range and qualification status?
Both are offered in commercial/industrial SOIC packages by Analog Devices, but the exact temperature grade and qualification details must be confirmed from the respective datasheets and ordering guides. Designers should not assume identical ratings without verifying the specific orderable part number.