Part A
ADM705AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2558 Stückzahl
- Package
- SOIC-8
- Series
- PMIC-Kontrolleure
Replacement verdict
Compatible functional replacement candidate
The ADM705AR and ADM706PAR are both microprocessor supervisory circuits from Analog Devices in the same 8-lead SOIC package, sharing core reset and watchdog functionality. However, they differ in reset threshold voltage and reset output stage configuration, so the ADM706PAR is a functional replacement candidate for the ADM705AR only after the reset threshold and output drive requirements of the target design are validated.
Reset Threshold Voltage
Validation required
Reset Output Type
Validation required
Package Type
High match
Supply Voltage Range
High match
Parts at a glance
Part B
ADM706PAR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7751 Stückzahl
- Package
- SOIC-8
- Series
- PMIC-Kontrolleure
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM705AR | ADM706PAR | Why it matters |
|---|---|---|---|
| Reset Threshold Voltage (typ) | 4.65 V | 2.63 V | Determines the supply voltage at which the supervisor asserts reset; the two parts monitor different nominal rails (5 V vs 3 V/3.3 V systems), so they are not directly substitutable without matching the monitored rail. |
| Reset Output Type | Active-low push-pull (RESET) | Active-low push-pull (RESET) | Defines the logic polarity and drive style presented to the microcontroller reset pin; both are active-low push-pull, so interface polarity is compatible. |
| Manual Reset Input | Yes (MR, active-low) | Yes (MR, active-low) | Allows an external pushbutton or logic signal to force a system reset; both devices provide this feature, supporting identical board-level reset control. |
| Watchdog Timer | Yes (WDI, 1.6 s typ timeout) | Yes (WDI, 1.6 s typ timeout) | Detects firmware lock-ups by requiring periodic toggling; both include a watchdog with the same nominal timeout, so software supervision behavior is equivalent. |
| Reset Timeout Delay | 200 ms typ | 200 ms typ | Holds reset asserted after VCC returns to valid level to allow the processor clock and supply to stabilize; identical delay means the same startup timing margin. |
| Supply Voltage Range | 4.75 V to 5.5 V (5 V nominal) | 1.0 V to 5.5 V (3 V/3.3 V nominal) | Defines the operating rail the supervisor is designed for; the ADM705 targets 5 V systems while the ADM706 targets lower-voltage rails, so they suit different supply domains. |
| Supply Current (typ) | ~150 µA | ~150 µA | Affects standby power budget in always-on supervisory circuits; comparable quiescent current means similar impact on system power consumption. |
| Package | 8-lead SOIC (R suffix) | 8-lead SOIC (R suffix) | Determines PCB footprint and assembly compatibility; matching SOIC packages allow drop-in layout reuse if the monitored rail is changed. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies the ambient range over which reset thresholds and timing are guaranteed; identical ratings mean equivalent environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM705AR | ADM706PAR |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Type | Simple Reset/Power-On Reset | Simple Reset/Power-On Reset |
| Number of Voltages Monitored | 1 | 1 |
| Voltage - Threshold | 4.65V | 2.63V |
| Output | Push-Pull, Totem Pole | Push-Pull, Totem Pole |
| Reset | Active Low | Active High |
| 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 primary differences between the ADM705AR and ADM706PAR?
The ADM705AR is a microprocessor supervisory circuit with an active-low reset output and a watchdog timer, housed in an 8-lead SOIC package. The ADM706PAR is a similar supervisory circuit but features a manual reset input and a watchdog timer, also in an 8-lead SOIC package. The key distinction is that the ADM705AR provides a reset output only, while the ADM706PAR adds a manual reset input for external system reset control.
Do the ADM705AR and ADM706PAR have the same reset threshold voltage?
No. The ADM705AR has a reset threshold of 4.65 V (typical) for 5 V systems, while the ADM706PAR has a reset threshold of 2.63 V (typical) for 3 V or 3.3 V systems. The threshold voltage determines the supply voltage level at which the reset output asserts, so the two parts are intended for different nominal supply voltages.
Are the ADM705AR and ADM706PAR pin-compatible?
No, they are not pin-compatible. Both are 8-lead SOIC devices, but the pin functions differ: the ADM705AR uses pin 1 for the watchdog input and does not have a manual reset pin, whereas the ADM706PAR uses pin 1 for the manual reset input. Therefore, a direct drop-in replacement is not possible without verifying pin function compatibility in the target design.
What supply voltage range does each device support?
The ADM705AR is designed for 5 V systems with a reset threshold of 4.65 V, while the ADM706PAR is designed for 3 V/3.3 V systems with a reset threshold of 2.63 V. Both devices operate from a supply voltage that must remain above their respective reset thresholds for normal operation, and both include a watchdog timer for monitoring microprocessor activity.
Can the ADM706PAR be used as a replacement for the ADM705AR in an existing 5 V design?
No, the ADM706PAR is not a suitable replacement for the ADM705AR in a 5 V design. The ADM706PAR has a 2.63 V reset threshold, which is too low for reliable 5 V system monitoring, and its pinout differs due to the manual reset input. The ADM705AR should be used for 5 V applications requiring a 4.65 V reset threshold.
Do both devices include a watchdog timer?
Yes, both the ADM705AR and ADM706PAR include a watchdog timer function. The watchdog timer monitors microprocessor activity and asserts a reset if the microprocessor fails to toggle the watchdog input within the timeout period. This feature is common to both devices and is a key reason they are used in supervisory applications.
What package type do the ADM705AR and ADM706PAR use?
Both the ADM705AR and ADM706PAR are available in an 8-lead SOIC package. The package type is the same, but the pin functions differ between the two devices, so PCB layout and pin assignment must be verified before considering any substitution.