Part A
AD8561ARUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2740 PCS
- Series
- Linear - Comparatores
Replacement verdict
Not a drop-in replacement
The AD8561ARUZ and AD8566ARM-R2 are not drop-in replacements for one another. The AD8561ARUZ is a single high-speed comparator with complementary TTL/CMOS outputs in a 16-lead TSSOP, while the AD8566ARM-R2 is a dual rail-to-rail operational amplifier in an 8-lead MSOP. Their differing function, channel count, package footprint, and output topology make direct substitution impractical without circuit redesign.
Different device function
Different channel count
Different footprint
Different output type
Parts at a glance
Part B
AD8566ARM-R2
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7364 PCS
- Package
- TSSOP-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 | AD8561ARUZ | AD8566ARM-R2 | Why it matters |
|---|---|---|---|
| Number of Comparators/Amplifiers | 1 (single comparator) | 2 (dual amplifier) | Determines channel count; a single comparator cannot directly replace a dual amplifier in multi-channel signal chains. |
| Device Function | Comparator | Operational amplifier (rail-to-rail) | Comparators are optimized for digital output switching, while op-amps are for linear amplification; they are not functionally interchangeable. |
| Supply Voltage Range | ±2.5 V to ±5 V (dual) / 5 V to 10 V (single) | 2.7 V to 5.5 V (single supply) | The operating supply window must match the system rail to avoid damage or improper biasing. |
| Package | 8-lead TSSOP | 8-lead MSOP | Footprint and pinout compatibility affect whether a part can be dropped onto an existing PCB. |
| Output Type | TTL/CMOS-compatible digital output | Rail-to-rail analog voltage output | Output stage topology dictates whether the device drives logic inputs or analog signal paths. |
| Propagation Delay / Bandwidth | ~7 ns propagation delay | ~16 MHz gain bandwidth | Speed metrics differ by function; comparators are specified by delay, op-amps by bandwidth, affecting timing-critical designs. |
| Input Offset Voltage | ~3 mV (typ) | ~1 mV (typ) | Offset voltage impacts threshold accuracy in comparators and DC precision in amplifier circuits. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | Temperature rating determines suitability for harsh or automotive-grade environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8561ARUZ | AD8566ARM-R2 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | - | General Purpose |
| Number of Circuits | - | 2 |
| Output Type | CMOS, Complementary, TTL | Rail-to-Rail |
| Slew Rate | - | 6V/µs |
| Gain Bandwidth Product | - | 5 MHz |
| Current - Input Bias | - | 80 nA |
| Voltage - Input Offset | - | 2 mV |
| Supply Current | - | 700µA (x2 Channels) |
| Current - Output / Channel | - | 35 mA |
| Voltage - Supply Span(Min) | - | 4.5 V |
| Voltage - Supply Span(Max) | - | 16 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | AD8561 | - |
| Type | Standard (General Purpose) | - |
| Number of Elements | 1 | - |
| Voltage - Supply, Single / Dual (±) | 3V ~ 10V, ±1.5V ~ 5V | - |
| Voltage - Input Offset (Max) | 7mV @ 5V | - |
| Current - Input Bias (Max) | 6µA @ 5V | - |
| Current - Quiescent (Max) | 6mA, 3.3mA, 5.5mA | - |
| CMRR, PSRR (Typ) | 85dB CMRR, 65dB PSRR | - |
| Propagation Delay (Max) | 9.8ns | - |
| Packaging | Tube | - |
Frequently asked questions
What are the primary differences between the AD8561ARUZ and AD8566ARM-R2?
The AD8561ARUZ is a single high-speed comparator in a 16-lead TSSOP package, while the AD8566ARM-R2 is a dual high-speed comparator in an 8-lead MSOP package. The AD8561 offers a single comparator with complementary output and latch enable, whereas the AD8566 provides two independent comparators in a smaller footprint.
Are the AD8561ARUZ and AD8566ARM-R2 pin-compatible?
No. The AD8561ARUZ uses a 16-lead TSSOP package, and the AD8566ARM-R2 uses an 8-lead MSOP package. The pin counts, pin functions, and package dimensions differ, so they are not pin-compatible and cannot be directly substituted without PCB redesign.
What is the propagation delay of each device?
The AD8561ARUZ has a typical propagation delay of 7 ns. The AD8566ARM-R2 has a typical propagation delay of 7 ns as well. Both are high-speed comparators suitable for fast signal processing applications.
What are the supply voltage ranges for the AD8561ARUZ and AD8566ARM-R2?
Both the AD8561ARUZ and AD8566ARM-R2 operate from a single supply of 2.7 V to 5.5 V or from dual supplies of ±1.35 V to ±2.75 V. This makes them suitable for low-voltage and portable applications.
Do these comparators have internal hysteresis?
Yes. Both the AD8561ARUZ and AD8566ARM-R2 feature internal hysteresis of 6 mV typical, which helps prevent oscillation with slow-moving input signals and improves noise immunity.
What output configuration does each comparator provide?
The AD8561ARUZ provides complementary TTL/CMOS-compatible outputs (Q and Q-bar) with a latch enable function. The AD8566ARM-R2 provides push-pull CMOS-compatible outputs for each of its two comparators, without a latch function.
Which device is better suited for dual-comparator applications in space-constrained designs?
The AD8566ARM-R2 is better suited for dual-comparator applications in space-constrained designs because it integrates two comparators in a single 8-lead MSOP package, whereas the AD8561ARUZ contains only one comparator in a larger 16-lead TSSOP package.
What are the operating temperature ranges for these devices?
Both the AD8561ARUZ and AD8566ARM-R2 are specified for operation over the industrial temperature range of −40°C to +85°C, making them suitable for industrial and commercial applications.