Part A
AD8561AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4375 PCS
- Package
- SOIC-8
- Series
- Linear - Comparators
Replacement verdict
Compatible functional replacement candidate
The AD8564ARZ-REEL is a viable functional replacement candidate for the AD8561AR, sharing the same single-supply comparator architecture, SOIC-14 footprint, and industrial temperature range, though the AD8561AR's dedicated latch/enable control and faster propagation delay require validation against the target application's timing and control requirements.
Propagation Delay
Validation required
Package Type
High match
Latch/Enable Control
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD8564ARZ-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6817 PCS
- Package
- SOIC-16
- Series
- Linear - Comparators
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8561AR | AD8564ARZ-REEL | Why it matters |
|---|---|---|---|
| Number of Comparators | 1 | 4 | Determines how many independent comparison channels are available in a single package, directly affecting circuit density and channel count. |
| Propagation Delay | 7 ns | 7 ns | Sets the maximum speed at which the comparator can respond to input changes, critical for high-speed signal processing and timing applications. |
| Supply Voltage Range | ±5 V (dual) or 5 V to 10 V (single) | ±5 V (dual) or 5 V to 10 V (single) | Defines the operating voltage window; compatibility with the system supply rails is essential for direct substitution. |
| Input Offset Voltage (max) | 3 mV | 3 mV | Affects comparison accuracy; lower offset reduces threshold error and improves precision in decision-making circuits. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 16-Lead SOIC (surface mount, tape and reel) | Footprint and pin count must match the PCB layout; different packages require board redesign and cannot be drop-in replaced. |
| Output Type | TTL/CMOS compatible | TTL/CMOS compatible | Determines interface compatibility with downstream logic; matching output levels ensures direct connection without level shifting. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies the environmental range over which guaranteed performance holds; must cover the target application conditions. |
| Supply Current per Comparator (typ) | ~5.5 mA | ~5.5 mA | Impacts total power budget; per-channel current draw influences thermal design and battery life in portable systems. |
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 | AD8564ARZ-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Active |
| Type | General Purpose | General Purpose |
| Number of Elements | 1 | 4 |
| Output Type | CMOS, Complementary, TTL | CMOS, TTL |
| Voltage - Input Offset (Max) | 7mV @ 5V | 7mV @ 5V |
| Current - Input Bias(Max) | 6µA @ 5V | 4µA @ 5V |
| Current - Quiescent (Max) | 6mA, 3.3mA, 5.5mA | 14mA, 14mA, 7mA |
| CMRRPSRR(Typ) | 85dB CMRR, 65dB PSRR | 85dB CMRR, 80dB PSRR |
| Propagation Delay(Max) | 9.8ns | 9.8ns |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Voltage - Supply, Single/Dual (±) | 3V ~ 10V, ±1.5V ~ 5V | - |
Frequently asked questions
What are the primary differences between the AD8561AR and AD8564ARZ-REEL?
The AD8561AR is a single ultrafast comparator in an 8-lead SOIC package, while the AD8564ARZ-REEL is a quad ultrafast comparator in a 16-lead SOIC package supplied in tape-and-reel format. The AD8561 offers one comparator per package, and the AD8564 integrates four independent comparators in one package, making the AD8564ARZ-REEL suited to multi-channel designs.
Are the AD8561AR and AD8564ARZ-REEL pin-compatible?
No. The AD8561AR uses an 8-lead SOIC (R-8) package, and the AD8564ARZ-REEL uses a 16-lead SOIC (RW-16) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What is the propagation delay of these comparators?
Both the AD8561 and AD8564 are specified with a propagation delay of 7 ns typical. This fast response makes them suitable for high-speed signal processing, timing, and threshold detection applications.
What supply voltage range do the AD8561AR and AD8564ARZ-REEL support?
Both devices operate from a single supply of 3 V to 10 V or from dual supplies of ±1.5 V to ±5 V. This flexibility allows use in both 5 V logic systems and split-supply analog designs.
Do the AD8561AR and AD8564ARZ-REEL have the same input and output characteristics?
Yes, both comparators share the same core specifications: 7 ns typical propagation delay, input offset voltage of 0.7 mV typical, and complementary TTL/CMOS-compatible outputs. The AD8564 integrates four such comparators in a single package, while the AD8561 provides one.
What is the difference in power consumption between the two parts?
The AD8561AR typically draws about 5.5 mA per comparator, while the AD8564ARZ-REEL, containing four comparators, typically draws about 22 mA total. Per-comparator supply current is comparable, but total package current scales with the number of integrated comparators.
Why is the AD8564ARZ-REEL supplied in tape-and-reel form?
The "-REEL" suffix indicates the AD8564ARZ is packaged in tape-and-reel format for automated pick-and-place assembly. The AD8561AR is typically supplied in tube or tray format. The tape-and-reel option supports high-volume SMT production lines.
Can the AD8561AR be replaced by the AD8564ARZ-REEL in an existing design?
Not directly. Although the comparators share similar electrical specifications, the AD8564ARZ-REEL is a 16-lead quad device and the AD8561AR is an 8-lead single device. A replacement requires PCB redesign to accommodate the different package, pinout, and land pattern, and unused comparator inputs on the AD8564 must be properly terminated.