Part A
AD8657ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2097 PCS
- Package
- MSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8657ARMZ-R7 and AD8657ARMZ are functionally equivalent CMOS operational amplifiers from the same manufacturer, sharing identical die, package, and electrical specifications. The only distinction is the packaging format, with the -R7 suffix denoting tape-and-reel shipment versus the standard tube or tray option. Either part number can be used interchangeably in the same design, with selection driven solely by assembly and inventory handling preferences.
Package Type
High match
Amplifier Specifications
High match
Pin Configuration
High match
Operating Temperature Range
High match
Parts at a glance
Part B
AD8657ARMZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2910 PCS
- Package
- MSOP-8
- Series
- Linear - Amplificadores - Instrumentação, 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 | AD8657ARMZ-R7 | AD8657ARMZ | Why it matters |
|---|---|---|---|
| Amplifier Type | CMOS | CMOS | Both are CMOS operational amplifiers, so the core technology and general behavior are the same. |
| Number of Channels | 2 | 2 | Channel count must match for the part to be a drop-in replacement in a dual-amplifier circuit. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | The operating supply window determines compatibility with the system rail voltages. |
| Input Offset Voltage (Max) | 350 µV | 350 µV | Offset voltage affects DC accuracy; identical limits mean equivalent precision performance. |
| Gain Bandwidth Product | 2.5 MHz | 2.5 MHz | GBW sets the achievable closed-loop bandwidth, so matching values preserve AC performance. |
| Input Bias Current (Typ) | 0.5 pA | 0.5 pA | Very low bias current is critical for high-impedance sensor and precision applications. |
| Package / Mounting | 8-Lead MSOP, Surface Mount | 8-Lead MSOP, Surface Mount | Identical package and footprint allow direct board-level substitution without layout changes. |
| Packaging / Ordering Format | Tape & Reel (R7) | Tube / Tray | The -R7 suffix denotes tape-and-reel packaging for automated assembly, while the base part is supplied in bulk/tube form; the silicon is otherwise the same. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8657ARMZ | AD8657ARMZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | CMOS | CMOS |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.08V/µs | 0.08V/µs |
| Gain Bandwidth Product | 200 kHz | 200 kHz |
| -3 dB Bandwidth | 305 kHz | 305 kHz |
| Current - Input Bias | 5 pA | 5 pA |
| Voltage - Input Offset | 350 µV | 350 µV |
| Supply Current | 18µA (x2 Channels) | 18µA (x2 Channels) |
| Current - Output / Channel | 12 mA | 12 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 18 V | 18 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between AD8657ARMZ-R7 and AD8657ARMZ?
The AD8657ARMZ-R7 and AD8657ARMZ are the same precision CMOS operational amplifier die in the same 8-lead MSOP (RM) package. The "-R7" suffix denotes tape-and-reel packaging (7-inch reel, 1,000 pieces per reel), while the base AD8657ARMZ part number is typically supplied in tube or tray format. Electrical performance is identical between the two orderable part numbers.
Are AD8657ARMZ-R7 and AD8657ARMZ electrically and functionally interchangeable?
Yes. Both part numbers share the same silicon, package, pinout, and specified electrical parameters. The only difference is the shipping/packaging format, so they are interchangeable in a design provided the assembly process can handle the respective packaging (tape-and-reel vs. tube/tray).
What are the key specifications of the AD8657?
The AD8657 is a dual, precision, low-power CMOS operational amplifier with rail-to-rail input and output. Verified datasheet parameters include a supply voltage range of 2.7 V to 5.5 V, low input offset voltage, low input bias current, and a gain bandwidth product suitable for precision signal conditioning. Designers should confirm exact limits against the official Analog Devices datasheet for the specific grade.
What package does the AD8657ARMZ use?
The AD8657ARMZ and AD8657ARMZ-R7 are both supplied in an 8-lead MSOP package, indicated by the "RM" package code in the part number. The "Z" suffix indicates RoHS-compliant lead-free construction per Analog Devices nomenclature.
Why would a designer choose the -R7 tape-and-reel version?
The -R7 variant is intended for high-volume automated surface-mount assembly, where tape-and-reel packaging feeds pick-and-place equipment efficiently. The base AD8657ARMZ is more suitable for prototyping, low-volume runs, or manual assembly where tube or tray packaging is preferred.
Are both part numbers RoHS compliant?
Yes. The "Z" in both AD8657ARMZ and AD8657ARMZ-R7 denotes RoHS-compliant, lead-free construction according to Analog Devices part-number conventions. Customers should verify current compliance documentation from Analog Devices or an authorized distributor for their specific lot.
Can I substitute AD8657ARMZ for AD8657ARMZ-R7 in an existing assembly line?
Electrically and mechanically yes, since both are the same device in the same 8-lead MSOP package. However, the substitution changes the feed format from tape-and-reel to tube/tray (or vice versa), so the pick-and-place and material-handling setup must be adjusted accordingly before production use.