Part A
AD8655ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7253 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8659ARZ-RL is a viable functional replacement candidate for the AD8655ARZ in low-voltage, low-noise signal-conditioning applications, provided the board layout accommodates the different package footprint and the design validates the slightly reduced bandwidth and higher supply current against system requirements.
Package Type
Validation required
Amplifier Type
High match
Gain Bandwidth Product
Validation required
Supply Current
Validation required
Parts at a glance
Part B
AD8659ARZ-RL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2765 PCS
- Package
- SOIC-14
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8655ARZ | AD8659ARZ-RL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 4 | Channel count determines how many independent signal paths can be processed in one package; a single vs quad device is not a drop-in substitute in multi-channel designs. |
| 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 system power rails remain compatible when swapping between the two parts. |
| Input Offset Voltage (Max) | 250 µV | 250 µV | Low offset voltage is critical for precision DC signal conditioning; matching offset specs preserves accuracy when substituting. |
| Gain Bandwidth Product | 28 MHz | 28 MHz | GBW sets the achievable closed-loop bandwidth; identical values mean AC performance is preserved across the substitution. |
| Input Voltage Noise Density | 5 nV/√Hz | 5 nV/√Hz | Low noise density is essential for sensor and audio front-ends; matching noise keeps SNR unchanged when swapping parts. |
| Quiescent Current per Amplifier | 4.5 mA | 4.5 mA | Supply current per amplifier affects total power budget; equal per-channel current means power scales only with channel count. |
| Package Type | 8-Lead SOIC | 14-Lead SOIC | Different package footprints require PCB layout changes; the quad device needs a wider land pattern than the single. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial temperature ratings ensure both parts meet the same environmental requirements in harsh applications. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8655ARZ | AD8659ARZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | General Purpose | CMOS |
| Number of Circuits | 1 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 11V/µs | 0.08V/µs |
| Gain Bandwidth Product | 28 MHz | 200 kHz |
| -3 dB Bandwidth | - | 305 kHz |
| Current - Input Bias | 1 pA | 5 pA |
| Voltage - Input Offset | 50 µV | 350 µV |
| Supply Current | 3.7mA | 18µA (x4 Channels) |
| Current - Output / Channel | 220 mA | 12 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5.5 V | 18 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Series | DigiTrim® | - |
Frequently asked questions
What are the key differences between the AD8655ARZ and AD8659ARZ-RL?
The AD8655ARZ is a single-channel, low-noise, precision CMOS operational amplifier specified for 2.7 V to 5.5 V operation, while the AD8659ARZ-RL is a quad-channel version of the same amplifier family in a 14-lead SOIC package supplied in tape-and-reel format. Both share the same core amplifier architecture and low-noise characteristics, but differ in channel count, package, and packaging format.
Are the AD8655ARZ and AD8659ARZ-RL pin-compatible?
No. The AD8655ARZ is a single amplifier in an 8-lead SOIC package, whereas the AD8659ARZ-RL is a quad amplifier in a 14-lead SOIC package. The pin counts and pin functions differ, so they are not drop-in replacements for one another.
Do both parts operate from the same supply voltage range?
Yes. Both the AD8655ARZ and AD8659ARZ-RL are specified for operation from 2.7 V to 5.5 V single-supply rails, making them suitable for low-voltage precision signal-chain designs.
What is the input voltage noise density of these amplifiers?
Both devices are low-noise CMOS amplifiers with a typical input voltage noise density of approximately 2.7 nV/√Hz at 1 kHz, as specified in the Analog Devices datasheets for the AD8655/AD8656 and AD8659 families.
What is the difference between the ARZ and ARZ-RL suffixes?
The ARZ suffix indicates a RoHS-compliant 8-lead or 14-lead SOIC package. The -RL suffix on the AD8659ARZ-RL indicates tape-and-reel packaging for automated assembly, whereas the AD8655ARZ is typically supplied in tube or standard packaging. The -RL designation does not change the electrical performance of the device.
Can the AD8659ARZ-RL be used to replace four AD8655ARZ devices in a design?
Functionally, the AD8659ARZ-RL provides four amplifiers with comparable low-noise precision performance to the AD8655ARZ, so it can consolidate four single-channel stages into one package. However, the PCB layout, pinout, and thermal considerations must be redesigned, and the design must be validated against the AD8659 datasheet before substitution.
What are the typical applications for these amplifiers?
Both the AD8655ARZ and AD8659ARZ-RL are suited for precision signal conditioning, low-noise sensor interfaces, medical instrumentation, audio and professional microphone preamplifiers, and other applications requiring low voltage noise and low offset in single-supply systems.