Part A
AD8561ARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2740 PCS
- Series
- Linear - Comparators
Replacement verdict
Compatible functional replacement candidate
The AD8561ARUZ and AD8564ARU-REEL are both single-supply comparators from Analog Devices in the same TSSOP-16 package, sharing a comparable supply voltage range and pin-compatible footprint. However, they differ in propagation delay, output drive capability, and input common-mode characteristics, so the AD8564ARU-REEL can serve as a functional replacement candidate only after validating timing margins and output loading in the target application.
Package Type
High match
Supply Voltage Range
High match
Propagation Delay
Validation required
Output Drive Capability
Validation required
Parts at a glance
Part B
AD8564ARU-REEL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5189 PCS
- Package
- TSSOP-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 | AD8561ARUZ | AD8564ARU-REEL | Why it matters |
|---|---|---|---|
| Number of Comparators | 1 | 4 | Determines how many independent comparison channels are available in a single package, directly affecting circuit architecture and channel count. |
| Propagation Delay | 7 ns (typ) | 7 ns (typ) | Sets the maximum speed at which the comparator can respond to input changes, critical for high-speed timing and signal detection applications. |
| Supply Voltage Range | ±5 V (dual) or 5 V to 10 V | ±5 V (dual) or 5 V to 10 V | Defines the operating voltage window; must match the system power rails for proper functionality and compatibility. |
| Input Offset Voltage | 0.5 mV (typ) | 0.5 mV (typ) | Affects comparison accuracy; lower offset reduces threshold error and improves precision in decision-making circuits. |
| Package / Mounting | TSSOP-8 (surface mount) | TSSOP-16 (surface mount) | Package footprint and pin count must match the PCB layout; different packages require board redesign and affect thermal and space considerations. |
| Output Type | TTL/CMOS compatible | TTL/CMOS compatible | Determines compatibility with downstream logic families and whether level shifting is required. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies the environmental range over which guaranteed performance is maintained, important for industrial and automotive applications. |
| Input Bias Current | 1 µA (typ) | 1 µA (typ) | Influences input impedance loading and error in high-impedance source applications; lower bias current improves accuracy. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8561ARUZ | AD8564ARU-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Standard (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) | - | 4µA @ 5V |
| Current - Quiescent (Max) | 6mA, 3.3mA, 5.5mA | 14mA, 14mA, 7mA |
| CMRRPSRR(Typ) | - | 85dB CMRR, 80dB PSRR |
| Propagation Delay(Max) | - | 9.8ns |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | AD8561 | - |
| Voltage - Supply, Single / Dual (±) | 3V ~ 10V, ±1.5V ~ 5V | - |
| Current - Input Bias (Max) | 6µA @ 5V | - |
| 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 AD8564ARU-REEL?
The AD8561ARUZ is a single high-speed comparator supplied in a 16-lead TSSOP tube package, while the AD8564ARU-REEL is a quad high-speed comparator supplied in a 16-lead TSSOP tape-and-reel package. The AD8561 offers one comparator channel, and the AD8564 integrates four independent comparators in the same package footprint, making the AD8564 suitable for higher channel-count designs.
Are the AD8561ARUZ and AD8564ARU-REEL pin-compatible?
No. Although both devices are housed in a 16-lead TSSOP package, their pinouts differ because the AD8561 is a single comparator with additional latch and input/output pins, whereas the AD8564 is a quad comparator with four independent channel pin sets. A direct drop-in replacement is not possible without PCB layout changes.
What is the propagation delay of each device?
Both the AD8561 and AD8564 are specified with a typical propagation delay of 7 ns. This fast response makes them suitable for high-speed signal processing, timing, and threshold detection applications.
Do both comparators support the same supply voltage range?
Yes. Both the AD8561ARUZ and AD8564ARU-REEL operate from a single supply of 3 V to 10 V or from dual supplies of ±1.5 V to ±5 V, allowing flexible use in mixed-signal and logic-level translation designs.
How do the input offset voltage specifications compare?
The AD8561 specifies a typical input offset voltage of 0.7 mV, while the AD8564 specifies a typical input offset voltage of 1.5 mV. Designers should account for this difference when evaluating threshold accuracy in precision comparator applications.
What output logic levels do these comparators provide?
Both devices feature complementary TTL/CMOS-compatible outputs. The AD8561 provides both Q and Q-bar outputs, and the AD8564 provides four independent outputs, each compatible with TTL and CMOS logic families for direct interfacing to digital circuitry.
What are the packaging and ordering differences between the two part numbers?
The AD8561ARUZ is supplied in a 16-lead TSSOP tube format, typically intended for prototyping and low-volume production. The AD8564ARU-REEL is supplied in a 16-lead TSSOP tape-and-reel format, which is optimized for automated pick-and-place assembly in high-volume manufacturing.
Can the AD8564ARU-REEL replace the AD8561ARUZ in an existing design?
No. Because the AD8564 is a quad comparator with a different pinout and channel count than the single AD8561, substitution requires a redesigned PCB layout and verification of all electrical parameters against the original design requirements. The two parts are not functionally or pin-for-pin interchangeable.