Part A
AD8651ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4971 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8659ARZ-RL is a viable functional replacement candidate for the AD8651ARZ in low-voltage precision signal-conditioning designs, provided the higher quiescent current and wider supply range are acceptable for the target application. Both parts share the same SOIC-8 footprint and CMOS rail-to-rail input/output architecture, but the AD8659ARZ-RL trades lower bandwidth for a broader supply window and higher output drive, so validation of the specific circuit's power budget and AC requirements is recommended before substitution.
Package Type
High match
Input/Output Architecture
High match
Supply Voltage Range
Validation required
Quiescent Current
Not compatible
Parts at a glance
Part B
AD8659ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2765 Stückzahl
- Package
- SOIC-14
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8651ARZ | 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 single-supply range, so power-rail compatibility is maintained when swapping between them. |
| Input Offset Voltage (max) | 250 µV | 250 µV | Offset voltage directly affects DC accuracy; matching values mean comparable precision in signal-conditioning applications. |
| Gain Bandwidth Product | 50 MHz | 50 MHz | GBW sets the achievable closed-loop bandwidth; identical values indicate similar AC performance and frequency response. |
| Input Voltage Noise Density | 4.5 nV/√Hz | 4.5 nV/√Hz | Low noise density is critical for precision and low-level signal amplification; matching values preserve noise performance. |
| Quiescent Current per Amplifier | 2.3 mA | 2.3 mA | Supply current per amplifier affects total power budget; equal per-channel current means power scales with channel count. |
| Package Type | 8-Lead SOIC | 14-Lead SOIC | Different package footprints and pin counts prevent direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings ensure equivalent environmental robustness for industrial and automotive use. |
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 | AD8651ARZ | AD8659ARZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | Voltage Feedback | CMOS |
| Number of Circuits | 1 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 41V/µs | 0.08V/µs |
| Gain Bandwidth Product | 50 MHz | 200 kHz |
| -3 dB Bandwidth | - | 305 kHz |
| Current - Input Bias | 1 pA | 5 pA |
| Voltage - Input Offset | 100 µV | 350 µV |
| Supply Current | 9.5mA | 18µA (x4 Channels) |
| Current - Output / Channel | 40 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 primary differences between the AD8651ARZ and AD8659ARZ-RL?
The AD8651ARZ is a single-channel, 50 MHz, low-noise, precision CMOS operational amplifier in an 8-lead SOIC package. The AD8659ARZ-RL is a quad-channel, 50 MHz, low-noise, precision CMOS operational amplifier in a 14-lead SOIC package supplied in tape-and-reel format. The core amplifier specifications are similar, but channel count, package, and packaging format differ.
Are the AD8651ARZ and AD8659ARZ-RL pin-compatible?
No. The AD8651ARZ is an 8-lead SOIC single amplifier, while the AD8659ARZ-RL is a 14-lead SOIC quad amplifier. They have different pin counts and pin functions, so they are not drop-in replacements for each other.
Do both devices share the same gain bandwidth and supply voltage range?
Yes. Both the AD8651 and AD8659 are specified with a 50 MHz gain bandwidth product and operate from a single supply of 2.7 V to 5.5 V, per Analog Devices datasheets. Designers should still verify the exact test conditions and limits in each respective datasheet.
How does the packaging format differ between the two parts?
The AD8651ARZ is supplied in standard 8-lead SOIC tube or tray quantities depending on the ordering code. The AD8659ARZ-RL suffix indicates tape-and-reel packaging for automated assembly, in a 14-lead SOIC package.
Can the AD8659ARZ-RL be used to replace two AD8651ARZ devices in a design?
Functionally, a quad AD8659 can replace multiple single AD8651 amplifiers only if the PCB is redesigned for the 14-lead SOIC footprint and the additional channels are properly terminated. It is not a direct drop-in substitution because package, pinout, and board layout differ.
Are both devices suitable for low-noise precision signal conditioning?
Yes. Both the AD8651 and AD8659 are marketed by Analog Devices as low-noise, precision CMOS operational amplifiers suitable for signal conditioning, filtering, and audio applications. Verify noise density and offset specifications in the respective datasheets for the target operating conditions.
Which part should be selected for a multi-channel design?
The AD8659ARZ-RL is the appropriate choice for multi-channel designs because it integrates four amplifiers in one 14-lead SOIC package, reducing board space and component count compared with using four AD8651ARZ single amplifiers.