Part A
AD8561AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4375 PCS
- Package
- SOIC-8
- Series
- Linear - Comparators
Replacement verdict
Compatible functional replacement candidate
The AD8561ARZ and AD8561AR are functionally equivalent comparators from the same manufacturer, sharing identical core electrical specifications, package type, and pinout. The only material distinction is the RoHS-compliant, lead-free construction of the AD8561ARZ versus the leaded (non-RoHS) construction of the AD8561AR, making the ARZ a suitable drop-in functional replacement where lead-free compliance is required.
Package Type
High match
Pin Configuration
High match
Supply Voltage Range
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 | AD8561ARZ | AD8561AR | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Same manufacturer ensures consistent design IP and support. |
| Comparator Type | General Purpose | General Purpose | Defines the fundamental function and application suitability. |
| Number of Elements | 1 | 1 | Single comparator per package affects channel count in a design. |
| Package / Case | 8-SOIC | 8-SOIC | Footprint compatibility is essential for drop-in substitution on a PCB. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method must match the board's manufacturing process. |
| Supply Voltage Range | 3 V to 10 V | 3 V to 10 V | Determines compatibility with the system power rail. |
| Output Type | CMOS, TTL | CMOS, TTL | Output logic compatibility affects interfacing with downstream digital circuitry. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Ensures reliable operation across the intended environmental conditions. |
| Packaging / RoHS Status | Tube; RoHS Compliant | Tape & Reel; Non-RoHS (contains lead) | RoHS compliance and packaging form affect regulatory compliance and assembly handling. |
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 | AD8561AR | AD8561ARZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Type | General Purpose | General Purpose |
| Number of Elements | 1 | 1 |
| Output Type | CMOS, Complementary, TTL | CMOS, Complementary, TTL |
| Voltage - Supply, Single/Dual (±) | 3V ~ 10V, ±1.5V ~ 5V | 3V ~ 10V, ±1.5V ~ 5V |
| Voltage - Input Offset (Max) | 7mV @ 5V | 7mV @ 5V |
| Current - Input Bias(Max) | 6µA @ 5V | 6µA @ 5V |
| Current - Quiescent (Max) | 6mA, 3.3mA, 5.5mA | 6mA, 3.3mA, 5.5mA |
| CMRRPSRR(Typ) | 85dB CMRR, 65dB PSRR | 85dB CMRR, 65dB PSRR |
| Propagation Delay(Max) | 9.8ns | 9.8ns |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the AD8561ARZ and the AD8561AR?
The AD8561ARZ and AD8561AR are functionally identical single comparators from Analog Devices. The primary difference is the package and lead finish: the AD8561ARZ is supplied in an 8-lead SOIC package with a RoHS-compliant, lead-free (matte tin) finish, while the AD8561AR is the older non-RoHS version of the same 8-lead SOIC device with a lead-containing finish. Both share the same electrical specifications, pinout, and die.
Are the AD8561ARZ and AD8561AR electrically interchangeable?
Yes. Both parts are the same comparator die with identical specified parameters, including a typical propagation delay of 7 ns, a 5 V to ±5 V supply range, and the same input and output characteristics. They differ only in package finish and RoHS compliance status, so they are electrically interchangeable in an existing design.
Is the AD8561ARZ a drop-in replacement for the AD8561AR?
Yes, from a footprint and pinout perspective. Both devices use the standard 8-lead SOIC (R-8) package with the same pin assignments, so the AD8561ARZ can be placed on a PCB designed for the AD8561AR. The only practical consideration is that the AD8561ARZ is RoHS-compliant and lead-free, which may require a reflow profile compatible with lead-free soldering.
What is the difference in RoHS compliance between these two parts?
The AD8561ARZ is RoHS-compliant and uses a lead-free (matte tin) lead finish, making it suitable for lead-free assembly processes. The AD8561AR is the non-RoHS version with a lead-containing finish. Designs intended for markets or processes requiring RoHS compliance should use the AD8561ARZ.
Do the AD8561ARZ and AD8561AR have the same package and pinout?
Yes. Both are offered in the 8-lead SOIC package with identical pin assignments: the same input, output, supply, and latch/enable pin functions. This common pinout allows either part to be used in the same PCB land pattern without layout changes.
Which part should be selected for a new design, the AD8561ARZ or the AD8561AR?
For new designs, the AD8561ARZ is generally preferred because it is the RoHS-compliant, lead-free version and is the currently active orderable variant. The AD8561AR is the legacy non-RoHS version and should only be selected where a leaded finish is specifically required or where existing inventory mandates its use.
Do both parts share the same key performance specifications?
Yes. Because they are the same die, both the AD8561ARZ and AD8561AR share the same datasheet specifications, including a typical 7 ns propagation delay, operation from a single 5 V or dual ±5 V supply, and the same input offset, input bias current, and output drive characteristics. Any performance difference between them is attributable to normal part-to-part variation, not to the package suffix.