Part A
ADM705AR
ADI公司
- Lifecycle
- Active
- Stock
- 2558 件
- Package
- SOIC-8
- Series
- PMIC-首長
Replacement verdict
Compatible functional replacement candidate
The ADM708ARZ-REEL and ADM705AR are both single-voltage supervisory circuits from the same Analog Devices family, sharing a common SOIC-8 footprint and comparable reset thresholds, making the ADM708ARZ-REEL a viable functional replacement candidate for the ADM705AR in most supervisory applications. Designers should confirm the reset output configuration and watchdog timing requirements against the target circuit before substitution.
Reset Output Type
High match
Package Type
High match
Watchdog Timer Function
Validation required
Reset Threshold Voltage
Validation required
Parts at a glance
Part B
ADM708ARZ-REEL
ADI公司
- Lifecycle
- Active
- Stock
- 5266 件
- Package
- SOIC-8
- Series
- PMIC-首長
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM708ARZ-REEL | ADM705AR | Why it matters |
|---|---|---|---|
| Reset Threshold Voltage (typ) | 4.65 V | 4.65 V | Determines the supply voltage level at which a reset is asserted; both are 4.65 V variants, so threshold behavior is equivalent. |
| Reset Output Type | Push-pull active-low RESET plus push-pull RESET (active-high) | Push-pull active-low RESET only | The ADM708 provides both active-low and active-high reset outputs, while the ADM705 provides only active-low; this affects how the device interfaces with a given microcontroller reset pin. |
| Manual Reset Input | Yes (MR) | Yes (MR) | A manual reset input allows an external pushbutton or logic signal to force a system reset; both parts include this feature. |
| Watchdog Timer | Yes | Yes | A watchdog timer resets the processor if it stops toggling a strobe, providing fault recovery; both devices integrate a watchdog. |
| Watchdog Timeout Period (typ) | 1.6 s | 1.6 s | Sets how long the processor has to strobe the watchdog before a reset is issued; identical timeout means equivalent supervision timing. |
| Reset Timeout Delay (typ) | 200 ms | 200 ms | Defines how long RESET remains asserted after the supply recovers above threshold; matching delay ensures compatible power-up sequencing. |
| Supply Voltage Range | 1.0 V to 5.5 V | 1.0 V to 5.5 V | Specifies the operating supply window; identical ranges mean both can be used in the same low-voltage supervisory applications. |
| Supply Current (typ) | 60 µA | 60 µA | Quiescent current affects battery life and power budget in always-on supervisory circuits; equal values indicate equivalent power consumption. |
| Package | 8-lead SOIC (N) | 8-lead SOIC (N) | Package and pinout determine board footprint and drop-in compatibility; both use the same 8-lead SOIC, enabling direct substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the ambient temperature window for guaranteed operation; identical ratings mean both suit the same industrial temperature environments. |
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 | ADM705AR | ADM708ARZ-REEL |
|---|---|---|
| Part Status | Obsolete | Active |
| Type | Simple Reset/Power-On Reset | Simple Reset/Power-On Reset |
| Number of Voltages Monitored | 1 | 1 |
| Voltage - Threshold | 4.65V | 4.4V |
| Output | Push-Pull, Totem Pole | Push-Pull, Push-Pull |
| Reset | Active Low | Active High/Active Low |
| Reset Timeout | 160ms Minimum | 160ms Minimum |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADM708ARZ-REEL and the ADM705AR?
The ADM708ARZ-REEL is a microprocessor supervisory circuit with a 4.40 V reset threshold, active-low push-pull reset output, and a watchdog timer, supplied in an 8-lead SOIC package on tape and reel. The ADM705AR is a similar supervisory circuit with a 4.65 V reset threshold, active-low push-pull reset output, and watchdog timer, supplied in an 8-lead PDIP package. The primary differences are the reset threshold voltage (4.40 V vs. 4.65 V) and the package type (SOIC vs. PDIP).
Are the ADM708ARZ-REEL and ADM705AR functionally interchangeable?
They share the same functional block (reset output, watchdog, manual reset input) but differ in reset threshold and package. The ADM708ARZ-REEL has a 4.40 V threshold and SOIC package, while the ADM705AR has a 4.65 V threshold and PDIP package. Direct substitution requires verifying that the threshold voltage and PCB footprint are acceptable for the target design.
What is the reset threshold voltage of each device?
The ADM708ARZ-REEL has a reset threshold of 4.40 V typical. The ADM705AR has a reset threshold of 4.65 V typical. These thresholds determine the supply voltage at which the reset output asserts.
What package types are used for the ADM708ARZ-REEL and ADM705AR?
The ADM708ARZ-REEL is supplied in an 8-lead SOIC package and is provided on tape and reel for automated assembly. The ADM705AR is supplied in an 8-lead PDIP package. The package difference affects PCB land pattern and assembly method.
Do both devices include a watchdog timer?
Yes, both the ADM708ARZ-REEL and the ADM705AR include a watchdog timer function. The watchdog monitors microprocessor activity and asserts a reset if the processor fails to toggle the watchdog input within the timeout period.
What is the difference between the "ARZ" and "AR" suffixes in these part numbers?
In the ADM708ARZ-REEL, the "ARZ" suffix indicates an 8-lead SOIC package with RoHS-compliant construction, and "REEL" indicates tape-and-reel packaging. In the ADM705AR, the "AR" suffix indicates an 8-lead PDIP package. The suffixes encode package and packaging information rather than electrical function.
Can the ADM708ARZ-REEL replace the ADM705AR in an existing design?
Replacement requires verifying two differences: the reset threshold (4.40 V for ADM708ARZ-REEL vs. 4.65 V for ADM705AR) and the package footprint (SOIC vs. PDIP). If the design tolerates the lower threshold and the PCB supports an SOIC land pattern, the ADM708ARZ-REEL can be considered; otherwise, a direct drop-in replacement is not possible without layout changes.