Part A
AD8657ARMZ
ADI公司
- Lifecycle
- Active
- Stock
- 2097 件
- Package
- MSOP-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Compatible functional replacement candidate
The AD8657ARMZ and AD8651ARM-R2 are both single-channel CMOS operational amplifiers in 8-lead MSOP packages with rail-to-rail input and output, making them a viable functional replacement pairing for many low-voltage precision signal-conditioning designs. However, the AD8657ARMZ offers a lower quiescent current and wider supply range, while the AD8651ARM-R2 provides substantially higher gain bandwidth and slew rate, so the substitution should be validated against the target application's bandwidth, drive, and power budget before adoption.
Amplifier Channel Count
High match
Package Type
High match
Gain Bandwidth Product
Validation required
Supply Voltage Range
Validation required
Parts at a glance
Part B
AD8651ARM-R2
ADI公司
- Lifecycle
- Active
- Stock
- 6636 件
- Package
- TSSOP-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 | AD8657ARMZ | AD8651ARM-R2 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines whether the part can directly replace the other in a circuit; a dual cannot drop into a single-op-amp footprint and vice versa. |
| 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 preserved between the two parts. |
| Input Offset Voltage (Max) | 350 µV | 500 µV | Lower offset improves DC accuracy; a difference here affects precision in sensor and instrumentation signal chains. |
| Gain Bandwidth Product | 2.5 MHz | 50 MHz | GBW sets the achievable closed-loop bandwidth; the much higher GBW of the single makes it unsuitable as a direct substitute in low-power, low-bandwidth designs. |
| Slew Rate | 1.2 V/µs | 22 V/µs | Slew rate limits large-signal response speed; a large mismatch changes transient behavior and distortion in the application. |
| Quiescent Current per Amplifier (Typ) | 18 µA | 1.5 mA | Quiescent current drives battery life and thermal budget; the two parts differ by orders of magnitude, affecting power-sensitive designs. |
| Input Voltage Noise Density | 22 nV/√Hz | 5 nV/√Hz | Lower noise density improves SNR in low-level signal amplification; the difference affects noise performance in precision front ends. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Matching package and pin count supports board-level compatibility, though pinout differs between single and dual devices. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings mean both suit the same environmental conditions without derating differences. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8657ARMZ | AD8651ARM-R2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | CMOS | Voltage Feedback |
| Number of Circuits | 2 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.08V/µs | 41V/µs |
| Gain Bandwidth Product | 200 kHz | 50 MHz |
| Current - Input Bias | 5 pA | 1 pA |
| Voltage - Input Offset | 350 µV | 100 µV |
| Supply Current | 18µA (x2 Channels) | 9.5mA |
| Current - Output / Channel | 12 mA | 40 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 18 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| -3 dB Bandwidth | 305 kHz | - |
Frequently asked questions
What are the key differences between the AD8657ARMZ and AD8651ARM-R2 operational amplifiers?
The AD8657ARMZ is a dual, low-power, precision CMOS operational amplifier with a typical supply current of 22 µA per amplifier and a gain bandwidth product of 230 kHz, optimized for low-power precision signal conditioning. The AD8651ARM-R2 is a single, high-speed CMOS operational amplifier with a 50 MHz gain bandwidth product and a typical supply current of 8 mA, optimized for high-speed signal processing. They differ in channel count, supply current, bandwidth, and target application.
Are the AD8657ARMZ and AD8651ARM-R2 pin-compatible?
No. The AD8657ARMZ is a dual operational amplifier in an 8-lead MSOP (RM) package, while the AD8651ARM-R2 is a single operational amplifier in an 8-lead MSOP package. Although both use the same package outline, the pin functions differ because one is a dual and the other is a single device; therefore, they are not direct pin-for-pin replacements.
Can the AD8657ARMZ be used as a drop-in replacement for the AD8651ARM-R2?
No. The AD8657ARMZ is a dual low-power precision amplifier with 230 kHz bandwidth and 22 µA per amplifier supply current, whereas the AD8651ARM-R2 is a single 50 MHz high-speed amplifier with 8 mA typical supply current. The differences in channel count, pinout, bandwidth, supply current, and dynamic performance prevent a direct drop-in substitution without circuit redesign and validation.
What are the typical supply current and bandwidth specifications of each device?
The AD8657ARMZ has a typical supply current of 22 µA per amplifier and a gain bandwidth product of 230 kHz. The AD8651ARM-R2 has a typical supply current of 8 mA and a gain bandwidth product of 50 MHz. These specifications reflect the different design targets: low-power precision for the AD8657ARMZ and high-speed performance for the AD8651ARM-R2.
What package types are the AD8657ARMZ and AD8651ARM-R2 available in?
Both devices are offered in 8-lead MSOP (RM) packages. The AD8657ARMZ is a dual operational amplifier in an 8-lead MSOP, and the AD8651ARM-R2 is a single operational amplifier in an 8-lead MSOP. The suffix "ARMZ" and "ARM-R2" both indicate the MSOP package option from Analog Devices.
Which device is better suited for low-power battery-operated applications?
The AD8657ARMZ is better suited for low-power battery-operated applications because its typical supply current is 22 µA per amplifier, compared with 8 mA typical for the AD8651ARM-R2. The AD8657ARMZ also provides rail-to-rail input and output operation, making it appropriate for precision low-voltage signal chains where quiescent current is critical.
Which device is better suited for high-speed signal conditioning?
The AD8651ARM-R2 is better suited for high-speed signal conditioning because its gain bandwidth product is 50 MHz, compared with 230 kHz for the AD8657ARMZ. The AD8651ARM-R2 also offers a higher slew rate and faster settling, making it appropriate for applications such as active filters, ADC drivers, and high-speed buffering.
Do both devices operate from the same supply voltage range?
Both the AD8657ARMZ and AD8651ARM-R2 are specified for operation from a single supply of 2.7 V to 5.5 V. This common supply range allows both devices to be used in 3 V and 5 V systems, although their performance specifications and current consumption differ significantly.