Part A
AD8564ARZ-REEL7
ADI公司
- Lifecycle
- Active
- Stock
- 3564 件
- Package
- SOIC-16
- Series
- 線性比較器
Replacement verdict
Not a drop-in replacement
The AD8564ARZ-REEL7 and AD8561AR-REEL7 are not drop-in replacements for one another. Although both are quad and single high-speed comparators respectively from the same Analog Devices family, they differ in channel count, package footprint, output architecture, and supply current, so the AD8561AR-REEL7 cannot directly substitute the AD8564ARZ-REEL7 in an existing design without schematic and layout changes.
Different channel count
Different package footprint
Different output type
Different supply current
Parts at a glance
Part B
AD8561AR-REEL7
ADI公司
- Lifecycle
- Active
- Stock
- 7283 件
- Package
- SOIC-8
- Series
- 線性比較器
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-REEL7 | Why it matters |
|---|---|---|---|
| Number of Comparators | 4 | 1 | Determines how many independent comparison channels are available in a single package; a quad device cannot directly replace a single device in multi-channel designs. |
| Propagation Delay | 7 ns (typ) | 9.8 ns (typ) | Affects the maximum achievable comparison speed and timing accuracy in high-speed signal chains. |
| 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 operating supply window; the wider low-voltage range of the AD8561 allows operation in lower-voltage systems where the AD8564 cannot be used. |
| Input Offset Voltage (max) | 6 mV | 3 mV | Lower offset improves threshold accuracy and reduces comparison error in precision detection circuits. |
| Input Bias Current (typ) | 1 µA | 3 µA | Bias current interacts with source impedance and can shift the effective comparison threshold, especially in high-impedance inputs. |
| Output Type | CMOS/TTL-compatible push-pull | Complementary (TTL/CMOS-compatible) outputs | Output structure determines drive capability, logic-level compatibility, and whether external pull-ups are required for interfacing. |
| Package | 14-lead SOIC | 8-lead SOIC | Footprint and pin count must match the PCB layout; different packages are not drop-in compatible. |
| Supply Current per Comparator (typ) | ~3.5 mA (total, quad) | ~6 mA (single) | Impacts power budget and thermal design; per-channel consumption differs significantly between the two devices. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for the same industrial temperature environment, so thermal suitability is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8564ARZ-REEL7 | AD8561AR-REEL7 |
|---|---|---|
| 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 key differences between the AD8564ARZ-REEL7 and AD8561AR-REEL7?
The AD8564 is a quad comparator, while the AD8561 is a single comparator. The AD8564ARZ-REEL7 is supplied in a 16-lead SOIC package, whereas the AD8561AR-REEL7 is supplied in an 8-lead SOIC package. Both are fast comparators from Analog Devices, but they differ in channel count, package size, and pinout.
Are the AD8564ARZ-REEL7 and AD8561AR-REEL7 pin-compatible?
No. The AD8564ARZ-REEL7 uses a 16-lead SOIC package and the AD8561AR-REEL7 uses an 8-lead SOIC package. The pin counts and pin functions differ, so they are not drop-in replacements for each other.
What is the propagation delay of each device?
Both the AD8564 and AD8561 are specified with a propagation delay of approximately 7 ns, making them suitable for high-speed comparator applications. Designers should confirm the exact test conditions in the respective Analog Devices datasheets.
What supply voltage range do these comparators support?
Both the AD8564 and AD8561 operate from a single supply of 3 V to 5.5 V or from dual supplies of ±1.5 V to ±2.75 V, per the Analog Devices datasheets. The allowable supply range should be verified against the specific grade and operating conditions.
How many comparators are integrated in each part?
The AD8564ARZ-REEL7 contains four independent comparators in one package, while the AD8561AR-REEL7 contains a single comparator. This difference affects channel density and PCB layout for multi-channel designs.
What output configuration do these comparators provide?
Both the AD8564 and AD8561 provide complementary TTL/CMOS-compatible outputs, with both inverting and non-inverting outputs available. This allows flexible interfacing to digital logic in high-speed signal chains.
Can the AD8561AR-REEL7 be used to replace one channel of an AD8564ARZ-REEL7?
Functionally, a single AD8561 comparator can perform the role of one channel of the AD8564, but it is not a pin-compatible or package-compatible substitute. The 8-lead SOIC footprint and pinout of the AD8561 differ from the 16-lead SOIC of the AD8564, so a PCB redesign would be required.
What are the packaging and reel options for these parts?
Both devices are offered in the REEL7 tape-and-reel format for automated assembly. The AD8564ARZ-REEL7 is in a 16-lead SOIC package, and the AD8561AR-REEL7 is in an 8-lead SOIC package, as specified in the Analog Devices ordering guides.