Part A
AD8651ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4971 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8651ARZ and AD8651AR are functionally equivalent operational amplifiers from the same Analog Devices AD8651 family, sharing identical core electrical specifications. The AD8651ARZ is the RoHS-compliant, lead-free SOIC-8 package variant, while the AD8651AR is the earlier non-RoHS version. For new designs requiring environmental compliance, the AD8651ARZ is the preferred drop-in choice; the AD8651AR remains usable where leaded (non-RoHS) assembly is acceptable.
Amplifier Core Specifications
High match
Package Type
High match
Pin Configuration
High match
RoHS Compliance
Validation required
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 | AD8651AR | Why it matters |
|---|---|---|---|
| Package / Mounting Type | 8-SOIC (surface mount), RoHS-compliant | 8-SOIC (surface mount), non-RoHS (leaded) | The Z suffix denotes a RoHS-compliant lead-free package, while the non-Z version uses leaded solder; this affects regulatory compliance and solder process compatibility, though footprint is identical. |
| RoHS Compliance | RoHS compliant | Not RoHS compliant | RoHS status determines whether the part can be used in products sold into regulated markets (e.g., EU); non-compliant parts may be restricted or require exemptions. |
| Amplifier Type / Number of Channels | Single, precision CMOS op amp | Single, precision CMOS op amp | Confirms both are single-channel CMOS op amps, ensuring the same circuit topology and channel count for direct substitution. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical supply range means the parts are interchangeable across the same low-voltage single-supply systems without redesign. |
| Gain Bandwidth Product | 50 MHz | 50 MHz | Matching bandwidth ensures equivalent AC performance and stability in the same feedback networks. |
| Input Offset Voltage (max) | 250 µV | 250 µV | Identical offset voltage guarantees the same DC accuracy for precision signal-conditioning applications. |
| Input Bias Current | 1 pA (typ) | 1 pA (typ) | Very low, equal input bias current preserves high-impedance sensor and photodiode interface performance identically. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Same temperature range ensures equivalent reliability and performance across industrial and extended-temperature environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8651ARZ | AD8651AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | DigiTrim® | DigiTrim® |
| 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 |
Frequently asked questions
What is the difference between the AD8651ARZ and the AD8651AR?
The AD8651ARZ and AD8651AR are both Analog Devices AD8651 precision CMOS operational amplifiers in an 8-lead SOIC package. The suffix "Z" in AD8651ARZ denotes RoHS-compliant, lead-free (Pb-free) packaging, while the AD8651AR is the non-RoHS, lead-containing (Pb) version. The electrical specifications are otherwise identical.
Are the AD8651ARZ and AD8651AR electrically identical?
Yes. Both parts share the same AD8651 die and datasheet specifications, including a 50 MHz gain bandwidth product, 41 V/µs slew rate, 5 V to 15 V single-supply operation (or ±2.5 V to ±7.5 V dual supply), and low input offset voltage. The only documented difference is the RoHS/lead-free status of the package finish.
Can the AD8651ARZ be used as a drop-in replacement for the AD8651AR?
Yes, in most cases. Both are 8-lead SOIC (R-8) devices with identical pinouts and package dimensions, so the AD8651ARZ is a form-fit-function replacement for the AD8651AR. The substitution is appropriate where RoHS compliance is required or acceptable; verify any application-specific qualification requirements before switching.
Which part should be selected for a RoHS-compliant design?
The AD8651ARZ should be selected for RoHS-compliant designs, as its "Z" suffix indicates lead-free, RoHS-compliant construction. The AD8651AR is the non-RoHS version and is generally not suitable for products requiring RoHS compliance.
Do the AD8651ARZ and AD8651AR have the same package and pinout?
Yes. Both devices are supplied in the 8-lead SOIC package (R-8) with the same pin configuration, including the standard op-amp pinout for a single amplifier. PCB land patterns and footprint compatibility are therefore identical between the two variants.
What are the key specifications of the AD8651 that apply to both variants?
Both the AD8651ARZ and AD8651AR are specified with a 50 MHz gain bandwidth product, 41 V/µs slew rate, low input offset voltage, low input bias current, and operation from a 5 V to 15 V single supply or ±2.5 V to ±7.5 V dual supply. These parameters are common to both package variants per the Analog Devices datasheet.
Is the AD8651AR still recommended for new designs?
The AD8651AR is the non-RoHS variant and is generally not recommended for new designs that require RoHS compliance. For new designs, the AD8651ARZ (RoHS-compliant) is the appropriate choice, subject to availability and lifecycle status confirmed through Analog Devices or authorized distributors.