Part A
AD8617ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2547 PCS
- Package
- MSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The AD8617ARMZ and AD8611ARM-R2 are not drop-in replacements for one another. The AD8617ARMZ is a dual, low-power, rail-to-rail input/output operational amplifier, while the AD8611ARM-R2 is a single, high-speed comparator with complementary outputs. Their fundamental functions, channel counts, output architectures, and dynamic characteristics differ substantially, so substituting one for the other would require circuit redesign and cannot be treated as a direct swap.
Different device function
Different channel count
Different output type
Different dynamic characteristics
Parts at a glance
Part B
AD8611ARM-R2
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5026 PCS
- Package
- TSSOP-8
- Series
- Linear - Comparatores
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8617ARMZ | AD8611ARM-R2 | Why it matters |
|---|---|---|---|
| Amplifier Type | CMOS Operational Amplifier (dual) | Comparator (quad) | An op-amp and a comparator serve fundamentally different functions; they are not direct substitutes in most circuits. |
| Number of Channels | 2 | 4 | Channel count determines how many independent signal paths can be processed per package. |
| Supply Voltage Range | 1.8 V to 5.0 V | 2.7 V to 5.5 V | The supply range must match the system rail to ensure proper operation and compatibility. |
| Input Offset Voltage (max) | ±0.5 mV | ±6 mV | Lower offset improves DC accuracy; comparators typically tolerate larger offset than precision op-amps. |
| Gain Bandwidth / Propagation Delay | 1.5 MHz gain bandwidth | ~6 ns propagation delay | Op-amps are specified by bandwidth while comparators are specified by propagation delay, reflecting their different roles. |
| Output Type | Rail-to-rail CMOS | CMOS/TTL compatible | Output drive characteristics determine compatibility with downstream logic and load requirements. |
| Quiescent Current (per amplifier) | ~50 µA | ~1.5 mA | Quiescent current affects power budget, especially in battery-powered or low-power designs. |
| Package | 8-lead MSOP | 8-lead MSOP | Package footprint must match for board-level drop-in compatibility. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The temperature range must cover the application environment for reliable operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8617ARMZ | AD8611ARM-R2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | - | with Latch |
| Number of Elements | - | 1 |
| Output Type | Rail-to-Rail | Complementary, TTL |
| Voltage - Supply, Single/Dual (±) | - | 3V ~ 5V |
| Voltage - Input Offset (Max) | - | 7mV @ 5V |
| Current - Input Bias(Max) | - | 6µA @ 5V |
| Current - Quiescent (Max) | - | 10mA, 4mA |
| CMRRPSRR(Typ) | - | 85dB CMRR, 73dB PSRR |
| Propagation Delay(Max) | - | 5.5ns |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Amplifier Type | CMOS | - |
| Number of Circuits | 2 | - |
| Slew Rate | 0.1V/µs | - |
| Gain Bandwidth Product | 400 kHz | - |
| Current - Input Bias | 0.2 pA | - |
| Voltage - Input Offset | 400 µV | - |
| Supply Current | 38µA | - |
| Current - Output / Channel | 80 mA | - |
| Voltage - Supply Span(Min) | 1.8 V | - |
| Voltage - Supply Span(Max) | 5 V | - |
Frequently asked questions
What are the fundamental differences between the AD8617ARMZ and the AD8611ARM-R2?
The AD8617ARMZ is a dual, low-power, rail-to-rail input/output operational amplifier, whereas the AD8611ARM-R2 is a single, high-speed comparator. They serve entirely different functions in a signal chain and are not functionally interchangeable.
Are the AD8617ARMZ and AD8611ARM-R2 pin-compatible?
No. Although both devices are offered in an 8-lead MSOP package, their pinouts differ. The AD8617ARMZ is a dual op-amp with standard dual op-amp pin assignments, while the AD8611ARM-R2 is a single comparator with a different pin configuration, including a latch/enable function. They cannot be dropped into the same PCB footprint without redesign.
Can the AD8617ARMZ be used as a comparator, or the AD8611ARM-R2 as an op-amp?
No. The AD8617ARMZ is an operational amplifier optimized for linear amplification and is not specified for open-loop comparator duty. The AD8611ARM-R2 is a dedicated comparator with internal hysteresis and output stages intended for digital logic interfacing, and it is not specified for linear closed-loop amplification.
How do the supply voltage ranges of the AD8617ARMZ and AD8611ARM-R2 compare?
The AD8617ARMZ operates from a single supply of 1.8 V to 5.0 V (or dual supplies of ±0.9 V to ±2.5 V). The AD8611ARM-R2 operates from a single supply of 2.7 V to 5.5 V (or dual supplies of ±1.35 V to ±2.75 V). The AD8617ARMZ supports a lower minimum supply voltage.
What are the output stage characteristics of each device?
The AD8617ARMZ features a rail-to-rail input and output CMOS amplifier stage, allowing its output to swing close to both supply rails. The AD8611ARM-R2 provides a TTL/CMOS-compatible output with a specified output high and low voltage, designed to drive digital logic inputs directly.
Which device is better suited for low-power portable applications?
The AD8617ARMZ is typically the better choice for low-power linear signal conditioning, as it is specified with low supply current per amplifier. The AD8611ARM-R2 is intended for high-speed comparison functions and its supply current specification reflects that different role. Selection should be based on the required function rather than a direct current comparison alone.
Do these parts have different operating temperature ranges?
Both the AD8617ARMZ and the AD8611ARM-R2 are specified for the industrial temperature range of −40 °C to +125 °C, so temperature range is not a differentiator between them.
What is the significance of the "R2" and "Z" suffixes in these part numbers?
The "Z" suffix on AD8617ARMZ denotes a RoHS-compliant package. The "R2" suffix on AD8611ARM-R2 denotes a tape-and-reel packaging quantity of 2,000 units. These suffixes describe packaging and compliance, not electrical performance.