Part A
AD8564ARZ-REEL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3564 PCS
- Package
- SOIC-16
- Series
- Linear - Comparators
Replacement verdict
Compatible functional replacement candidate
The AD8561AR-REEL is a single-channel comparator while the AD8564ARZ-REEL7 is a quad-channel device, so the two are not pin-for-pin interchangeable; however, both share the same high-speed voltage-feedback comparator architecture, similar supply range, and comparable propagation delay, making the AD8561AR-REEL a viable functional substitute only where a single comparator channel is sufficient and the board layout is redesigned for the narrower SOIC-8 footprint.
Channel Count
Validation required
Supply Voltage Range
High match
Propagation Delay
High match
Package Type
Not compatible
Parts at a glance
Part B
AD8561AR-REEL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2973 PCS
- Package
- SOIC-8
- 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 | AD8564ARZ-REEL7 | AD8561AR-REEL | Why it matters |
|---|---|---|---|
| Number of Comparators | 4 | 1 | Determines how many independent comparison channels are available in a single package; a quad device cannot be directly substituted where a single comparator is required without redesign. |
| Propagation Delay | 7 ns (typ) | 9.8 ns (typ) | Sets the maximum speed at which the comparator can respond to input changes; critical for high-speed timing and pulse-width applications. |
| Supply Voltage Range | ±4.5 V to ±5.5 V (dual) / 4.5 V to 5.5 V (single) | ±2.5 V to ±5.5 V (dual) / 2.5 V to 5.5 V (single) | Defines the allowable power supply window; a wider range allows operation at lower supply voltages, affecting compatibility with existing rails. |
| Input Offset Voltage | 3 mV (max) | 2.5 mV (max) | Affects comparison accuracy near the threshold; lower offset reduces systematic error in precision threshold detection. |
| Input Bias Current | 4 µA (typ) | 3 µA (typ) | Influences error when driven from high-impedance sources; lower bias current improves accuracy in such signal chains. |
| Output Type | CMOS/TTL-compatible push-pull | Complementary (TTL/CMOS-compatible) with latch | Determines how the output interfaces to downstream logic and whether a latch function is available for sampling/hold behavior. |
| Latch Enable | No | Yes | A latch input allows the output to be frozen, enabling sample-and-hold or glitch-free threshold capture; its absence changes system timing behavior. |
| Package | 14-lead SOIC (R-14) | 8-lead SOIC (R-8) | Footprint and pin count must match the PCB layout; different packages require board redesign and cannot be drop-in substituted. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts support the same industrial temperature envelope, so environmental compatibility is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8564ARZ-REEL7 | AD8561AR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | General Purpose | General Purpose |
| Number of Elements | 4 | 1 |
| Output Type | CMOS, TTL | CMOS, Complementary, TTL |
| Voltage - Supply, Single/Dual (±) | - | 3V ~ 10V, ±1.5V ~ 5V |
| Voltage - Input Offset (Max) | 7mV @ 5V | 7mV @ 5V |
| Current - Input Bias(Max) | 4µA @ 5V | 6µA @ 5V |
| Current - Quiescent (Max) | 14mA, 14mA, 7mA | 6mA, 3.3mA, 5.5mA |
| CMRRPSRR(Typ) | 85dB CMRR, 80dB 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 are the primary differences between the AD8564ARZ-REEL7 and the AD8561AR-REEL?
The AD8564ARZ-REEL7 is a quad, 7 ns, single-supply comparator offered in a 16-lead SOIC package and supplied on a 7-inch reel. The AD8561AR-REEL is a single, ultrafast, 7 ns comparator offered in an 8-lead SOIC package and supplied on a 13-inch reel. The core difference is channel count (quad vs. single) and package pin count (16-lead vs. 8-lead).
Are the AD8564ARZ-REEL7 and AD8561AR-REEL pin-compatible?
No. The AD8564ARZ-REEL7 uses a 16-lead SOIC package, while the AD8561AR-REEL uses an 8-lead SOIC package. The pin counts and pin functions differ, so they are not drop-in replacements for each other.
Do both comparators have the same propagation delay specification?
Both the AD8564 and AD8561 are specified with a 7 ns propagation delay, making them members of the same ultrafast comparator family. Designers should still verify the exact test conditions and supply voltage in the respective datasheets, since propagation delay can vary with input overdrive and load.
What supply voltage range do the AD8564ARZ-REEL7 and AD8561AR-REEL support?
Both devices are designed for single-supply operation and are specified for a 5 V supply in their datasheets. The AD8564 is a single-supply quad comparator, and the AD8561 is a single-supply single comparator; both are intended for 5 V logic-compatible systems.
Can the AD8561AR-REEL be used where a quad comparator like the AD8564ARZ-REEL7 is required?
No, not directly. The AD8561AR-REEL contains only one comparator, whereas the AD8564ARZ-REEL7 contains four independent comparators. A single AD8561 cannot replace a quad device without adding external comparators or redesigning the circuit.
What output logic levels do these comparators provide?
Both the AD8564 and AD8561 provide logic-compatible outputs intended to interface with 5 V digital logic. The outputs are designed for single-supply operation, so the output swing is referenced to the supply and ground of the 5 V system.
How does the reel packaging differ between the AD8564ARZ-REEL7 and the AD8561AR-REEL?
The AD8564ARZ-REEL7 is supplied on a 7-inch reel, as indicated by the "REEL7" suffix. The AD8561AR-REEL is supplied on a standard 13-inch reel, as indicated by the "REEL" suffix. Both are tape-and-reel formats intended for automated assembly, but the reel diameter and quantity per reel differ.
Are both parts RoHS compliant?
The AD8564ARZ-REEL7 carries the "Z" suffix in its part number, which denotes a RoHS-compliant package. The AD8561AR-REEL part number does not include the "Z" suffix, so its RoHS status should be confirmed against the manufacturer's current datasheet or product page before use in RoHS-restricted designs.