Part A
AD8657ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2097 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8657ARMZ and AD8651ARMZ-R2 share the same MSOP-8 package, dual operational amplifier configuration, and CMOS rail-to-rail input/output architecture, making the AD8657ARMZ a viable functional replacement candidate for the AD8651ARMZ-R2 in many designs. However, the two devices differ in supply voltage range, quiescent current, and gain bandwidth, so the replacement should be validated against the specific application's power budget, bandwidth requirements, and operating conditions before adoption.
Package Type
High match
Amplifier Configuration
High match
Supply Voltage Range
Validation required
Gain Bandwidth Product
Validation required
Parts at a glance
Part B
AD8651ARMZ-R2
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8610 Stückzahl
- Package
- TSSOP-8
- 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 | AD8657ARMZ | AD8651ARMZ-R2 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines whether the part can serve multi-channel signal chains; a dual cannot directly replace a single in a one-channel layout without layout changes. |
| 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-rail compatibility is preserved when substituting. |
| Input Offset Voltage (Max) | ±0.35 mV | ±0.5 mV | Lower offset improves DC accuracy in precision signal conditioning; the dual part offers slightly tighter offset specification. |
| Gain Bandwidth Product | 2.7 MHz | 50 MHz | GBW sets the achievable closed-loop bandwidth; the much higher GBW of the single makes it suitable for faster signals, while the dual targets lower-power precision use. |
| Input Voltage Noise Density | 22 nV/√Hz | 5 nV/√Hz | Lower noise density benefits low-level signal amplification; the single part is significantly quieter than the dual. |
| Quiescent Current per Amplifier | ~200 µA | ~2.5 mA | Supply current drives battery life and thermal budget; the dual is a micropower part while the single draws substantially more current. |
| Slew Rate | 1.2 V/µs | 40 V/µs | Slew rate limits large-signal response speed; the single supports much faster transients, while the dual suits slow precision signals. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Matching package footprint allows board-level drop-in compatibility, though pin functions differ between single and dual configurations. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial/extended temperature ratings ensure both meet the same environmental requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8657ARMZ | AD8651ARMZ-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 AD8651ARMZ-R2?
The AD8657ARMZ is a dual, low-power, precision CMOS operational amplifier with a typical supply current of 18 µA per amplifier and a gain bandwidth product of 230 kHz, optimized for low-power precision signal conditioning. The AD8651ARMZ-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, speed, supply current, and target application.
Are the AD8657ARMZ and AD8651ARMZ-R2 pin-compatible?
No. The AD8657ARMZ is a dual op amp in an 8-lead MSOP (ARMZ) package, while the AD8651ARMZ-R2 is a single op amp in an 8-lead MSOP package. Although both use the same 8-lead MSOP footprint, the pin functions differ because one is a dual and the other is a single amplifier, so they are not directly interchangeable on the same PCB layout.
Can the AD8657ARMZ be used as a drop-in replacement for the AD8651ARMZ-R2?
No. The AD8657ARMZ is a dual low-power precision amplifier with 230 kHz gain bandwidth, while the AD8651ARMZ-R2 is a single 50 MHz high-speed amplifier. The channel count, pinout, bandwidth, and supply current differ significantly, so a direct drop-in replacement is not possible without redesigning the circuit and validating the new performance against the application requirements.
What are the typical supply current specifications for each device?
The AD8657ARMZ typically draws 18 µA per amplifier (36 µA total for the dual) from a single supply, making it suitable for battery-powered precision applications. The AD8651ARMZ-R2 typically draws 8 mA from a single supply, reflecting its high-speed 50 MHz design. These values should be confirmed against the latest Analog Devices datasheet for the specific grade and test conditions.
What are the gain bandwidth products of the AD8657ARMZ and AD8651ARMZ-R2?
The AD8657ARMZ has a gain bandwidth product of 230 kHz, suited to low-frequency precision signal conditioning. The AD8651ARMZ-R2 has a gain bandwidth product of 50 MHz, suited to high-speed signal processing and video or fast ADC driving applications. These parameters are specified in the respective Analog Devices datasheets.
Which device is better suited for low-power battery-operated designs?
The AD8657ARMZ is better suited for low-power battery-operated designs because its typical supply current is 18 µA per amplifier, far lower than the 8 mA typical supply current of the AD8651ARMZ-R2. The AD8657ARMZ also offers rail-to-rail input and output operation, which is beneficial in low-voltage precision systems.
Which device is better suited for high-speed signal processing?
The AD8651ARMZ-R2 is better suited for high-speed signal processing because its 50 MHz gain bandwidth product and 8 mA supply current support fast settling and wideband amplification. The AD8657ARMZ, with only 230 kHz gain bandwidth, is intended for low-frequency precision applications rather than high-speed signal chains.
Do both devices operate from a single supply, and what is the supply voltage range?
Both devices are CMOS operational amplifiers designed for single-supply operation. The AD8657ARMZ operates from a supply range of 2.7 V to 5.5 V, while the AD8651ARMZ-R2 operates from a supply range of 2.7 V to 5.5 V as well. Exact limits and test conditions should be verified in the respective Analog Devices datasheets before use in a design.