Part A
AD8561ARUZ
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Replacement verdict
Not a drop-in replacement
The AD8561ARUZ and AD8567ARU are not functionally interchangeable. The AD8561ARUZ is a single high-speed voltage comparator, while the AD8567ARU is a quad rail-to-rail operational amplifier. Their core functions, channel counts, output characteristics, and package pinouts differ fundamentally, so substituting one for the other is not feasible in existing designs.
Different device function
Different channel count
Different output type
Different pinout
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 | AD8567ARU | Why it matters |
|---|---|---|---|
| Number of Comparators / Amplifiers | 1 (single comparator) | 4 (quad amplifier) | A single comparator cannot directly replace a quad amplifier; the channel count determines how many signal paths the device can serve. |
| Device Function | Comparator | Operational amplifier | Comparators are optimized for digital output switching, while op amps are designed 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 supply range must match the system rail voltages for the part to operate within specification. |
| Output Type | TTL/CMOS-compatible digital output | Analog voltage output (rail-to-rail) | A digital output stage versus an analog output stage dictates whether the device can drive logic or must drive a linear signal chain. |
| Package | TSSOP-8 (RU suffix) | TSSOP-14 (RU suffix) | Different pin counts and footprints prevent drop-in board replacement even when the package family is the same. |
| Input Offset Voltage (typ) | ~1 mV | ~1 mV | Offset voltage affects threshold accuracy in comparators and DC precision in amplifiers; similar values ease precision matching. |
| Propagation Delay / Bandwidth | ~7 ns propagation delay | ~10 MHz gain bandwidth | Speed metrics differ by function: comparator delay governs switching speed, while op amp bandwidth governs signal fidelity. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensures both parts meet the same environmental requirements in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8561ARUZ | AD8567ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | - | General Purpose |
| Number of Circuits | - | 4 |
| 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 (x4 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
Are the AD8561ARUZ and AD8567ARU pin-compatible and directly interchangeable?
No. The AD8561ARUZ is a single high-speed comparator in an 8-lead TSSOP, while the AD8567ARU is a quad rail-to-rail operational amplifier in a 14-lead TSSOP. They differ in function, channel count, and package pin count, so they are not interchangeable.
What are the core functional differences between the AD8561ARUZ and AD8567ARU?
The AD8561ARUZ is a single comparator with a fast propagation delay (typically 7 ns) intended for threshold detection and timing applications. The AD8567ARU is a quad operational amplifier with rail-to-rail input and output, intended for signal conditioning and amplification across four channels.
How do the supply voltage requirements compare?
The AD8561ARUZ operates from a single supply of 3 V to 10 V or a dual supply of ±1.5 V to ±5 V. The AD8567ARU operates from a single supply of 2.7 V to 12 V or a dual supply of ±1.35 V to ±6 V. Both support 3 V and 5 V systems, but the AD8567ARU extends to a higher single-supply maximum.
Do the two devices differ in package and pin count?
Yes. The AD8561ARUZ is supplied in an 8-lead TSSOP (RU suffix), and the AD8567ARU is supplied in a 14-lead TSSOP (RU suffix). The different lead counts and pinouts prevent a drop-in replacement on the same PCB footprint.
Which device is better suited for high-speed threshold detection?
The AD8561ARUZ is the appropriate choice because it is a dedicated comparator with fast propagation delay (typically 7 ns) and complementary output capability. The AD8567ARU is an operational amplifier and is not specified as a comparator for high-speed threshold detection.
Which device is better suited for multi-channel analog signal conditioning?
The AD8567ARU is the appropriate choice because it integrates four rail-to-rail operational amplifiers in one package, reducing board space for multi-channel amplification and buffering. The AD8561ARUZ provides only a single comparator channel.
Can the AD8561ARUZ and AD8567ARU share the same PCB land pattern?
No. The 8-lead TSSOP land pattern of the AD8561ARUZ differs from the 14-lead TSSOP land pattern of the AD8567ARU in pad count and dimensions, so a board designed for one will not accept the other without redesign.
Are both devices specified for the same operating temperature range?
Both the AD8561ARUZ and AD8567ARU are specified over the industrial temperature range of −40°C to +85°C, so temperature range alone does not distinguish them for industrial applications.