Part A
AD8651ARMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6670 PCS
- Package
- MSOP-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Compatible functional replacement candidate
The AD8651ARMZ and AD8651ARM-R2 are functionally equivalent CMOS operational amplifiers sharing identical core specifications, making them viable substitutes in most designs; however, the "-R2" suffix denotes a tape-and-reel packaging variant, so reel quantity and packaging format should be confirmed against production requirements before substitution.
Amplifier Core Specifications
High match
Package Type
High match
Pin Configuration
High match
Packaging and Reel Format
Validation required
Parts at a glance
Part B
AD8651ARM-R2
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6636 PCS
- Package
- TSSOP-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8651ARMZ | AD8651ARM-R2 | Why it matters |
|---|---|---|---|
| Amplifier Type | Voltage Feedback | Voltage Feedback | Confirms both parts share the same core amplifier topology, a prerequisite for functional substitutability. |
| Number of Circuits | 1 | 1 | Both are single-channel devices, so channel count matches for direct replacement. |
| Gain Bandwidth Product | 50 MHz | 50 MHz | Determines the maximum signal frequency the amplifier can handle; identical values ensure equivalent AC performance. |
| Slew Rate | 41 V/µs | 41 V/µs | Affects large-signal transient response; matching slew rates preserve dynamic behavior in the application. |
| Input Offset Voltage | 100 µV (max) | 100 µV (max) | Low offset is critical for precision DC accuracy; identical limits mean no recalibration is needed. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines compatible power rails; matching ranges allow the same supply design to be reused. |
| Supply Current per Channel | 2.3 mA (typ) | 2.3 mA (typ) | Impacts power budget and thermal design; identical quiescent current keeps power consumption unchanged. |
| Input Bias Current | 1 pA (typ) | 1 pA (typ) | CMOS inputs with low bias current suit high-impedance sources; matching values preserve input loading characteristics. |
| Package / Mounting | 8-MSOP, Surface Mount | 8-MSOP, Surface Mount | Same package and footprint allow drop-in board replacement without layout changes. |
| Packaging / Ordering Format | Tube | Tape & Reel (R2) | The only difference is the shipping/ordering format; the electrical part is identical, but reel packaging suits automated assembly while tube suits prototyping. |
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 | AD8651ARMZ | AD8651ARM-R2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 41V/µs | 41V/µs |
| Gain Bandwidth Product | 50 MHz | 50 MHz |
| Current - Input Bias | 1 pA | 1 pA |
| Voltage - Input Offset | 100 µV | 100 µV |
| Supply Current | 9.5mA | 9.5mA |
| Current - Output / Channel | 40 mA | 40 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 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 AD8651ARMZ and AD8651ARM-R2, and how do they differ?
Both are Analog Devices AD8651 precision CMOS operational amplifiers in an 8-lead MSOP (RM) package. The AD8651ARMZ is the RoHS-compliant, lead-free (Z) ordering variant, while the AD8651ARM-R2 is a tape-and-reel (R2) ordering variant. They share the same die and electrical specifications; the differences are in ordering format and RoHS/lead-free status.
Are the AD8651ARMZ and AD8651ARM-R2 electrically identical?
Yes. Both parts use the same AD8651 silicon and are specified with the same key parameters, including a 50 MHz gain bandwidth product, 41 V/µs slew rate, 5 V to 5.5 V single-supply operation (2.7 V to 5.5 V), and low input bias current. The suffix differences relate to packaging/ordering, not to the amplifier's electrical performance.
Can the AD8651ARMZ and AD8651ARM-R2 be used interchangeably in a design?
Yes, from an electrical and footprint standpoint they are interchangeable because both are the same AD8651 die in the same 8-lead MSOP package. The choice between them depends on procurement requirements such as RoHS compliance (ARMZ) versus tape-and-reel packaging (ARM-R2).
What does the "Z" suffix mean on the AD8651ARMZ?
The "Z" suffix denotes Analog Devices' RoHS-compliant, lead-free package finish. The AD8651ARMZ is therefore the lead-free, RoHS-compliant ordering code for the AD8651 in the 8-lead MSOP package.
What does the "R2" suffix mean on the AD8651ARM-R2?
The "R2" suffix indicates a tape-and-reel packaging option (reel quantity per Analog Devices' ordering guide). It is an ordering/packaging designation and does not change the device's electrical specifications.
What are the key specifications of the AD8651?
Verified AD8651 parameters include: 50 MHz gain bandwidth product, 41 V/µs slew rate, single-supply operation from 2.7 V to 5.5 V, low input bias current (pA range), rail-to-rail output, and an 8-lead MSOP package. These specifications apply equally to the AD8651ARMZ and AD8651ARM-R2.
Which variant should be selected for a RoHS-compliant production build?
The AD8651ARMZ should be selected when RoHS compliance and lead-free assembly are required, because the "Z" suffix designates the RoHS-compliant, lead-free package finish. The AD8651ARM-R2 is an ordering/packaging variant and should be confirmed against the manufacturer's ordering guide for RoHS status before use in a compliance-critical build.