Part A
ADM705AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2558 PCS
- Package
- SOIC-8
- Series
- PMIC - Supervisores
Replacement verdict
Compatible functional replacement candidate
The ADM705AR and ADM706AR-REEL7 are functionally equivalent microprocessor supervisory circuits from the same manufacturer family, sharing identical supply voltage range, reset threshold, reset output type, and package footprint. The ADM706AR-REEL7 is supplied in tape-and-reel packaging, making it a viable functional replacement candidate for the ADM705AR in volume production, provided the watchdog timer function is validated against the target application requirements.
Reset Threshold Voltage
High match
Reset Output Type
High match
Package Type
High match
Watchdog Timer Function
Validation required
Parts at a glance
Part B
ADM706AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4273 PCS
- Package
- SOIC-8
- Series
- PMIC - Supervisores
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 | ADM706AR-REEL7 | Why it matters |
|---|---|---|---|
| Reset Threshold Voltage (typ) | 4.65 V | 4.40 V | Determines the supply voltage level at which the reset output asserts; a different threshold changes when the system is held in reset, affecting brownout behavior and compatibility with the monitored rail. |
| Reset Output Type | Active-low push-pull | Active-low push-pull | Defines how the reset signal is driven; push-pull outputs provide a defined logic level without an external pull-up, so identical types allow direct substitution in the reset path. |
| Watchdog Timer | Yes (1.6 s typ) | Yes (1.6 s typ) | The watchdog monitors processor activity and asserts reset on a hang; matching presence and timeout ensures the same supervisory behavior after replacement. |
| Manual Reset Input | Yes | Yes | A dedicated manual reset pin allows external system reset; both having it preserves board-level reset control functionality. |
| Supply Voltage Range | 4.75 V to 5.5 V | 4.75 V to 5.5 V | Defines the operating supply window; identical ranges mean the parts can operate from the same 5 V rail without circuit changes. |
| Reset Timeout Delay | 200 ms typ | 200 ms typ | Sets how long reset stays asserted after the supply recovers; matching delay ensures the processor gets the same startup margin. |
| Package | 8-SOIC | 8-SOIC | Footprint and pinout compatibility; identical packages allow drop-in replacement on the same PCB land pattern. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Determines environmental suitability; matching ranges mean both parts meet the same thermal requirements of the application. |
| Supply Current (typ) | 150 µA | 150 µA | Quiescent current affects overall power budget; identical values mean no change in standby power consumption. |
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 | ADM706AR-REEL7 |
|---|---|---|
| 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 | 4.4V |
| Output | Push-Pull, Totem Pole | Push-Pull, Totem Pole |
| Reset | Active Low | 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 ADM705AR and ADM706AR-REEL7?
Both are Analog Devices microprocessor supervisory circuits in 8-lead SOIC packages, but they differ in reset threshold voltage and packaging format. The ADM705AR has a reset threshold of 4.65 V (suitable for 5 V supplies), while the ADM706AR-REEL7 has a reset threshold of 4.40 V. The ADM706AR-REEL7 is supplied in tape-and-reel packaging (REEL7), whereas the ADM705AR is supplied in standard tube packaging.
Are the ADM705AR and ADM706AR-REEL7 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions: VCC, GND, RESET, RESET (active-low), WDI, PFO, PFI, and MR. This allows them to share the same PCB footprint, but the differing reset thresholds must be validated for the target supply voltage.
What supply voltage range do these supervisory circuits support?
Both the ADM705AR and ADM706AR-REEL7 operate from a supply voltage of 4.75 V to 5.5 V, making them intended for 5 V system monitoring. The ADM705AR's 4.65 V reset threshold and the ADM706AR-REEL7's 4.40 V reset threshold both fall within this operating range.
What is the function of the WDI, PFI, and PFO pins on these devices?
WDI is the watchdog input; if it is not toggled within the watchdog timeout period, the watchdog output asserts a reset. PFI is the power-fail comparator input, and PFO is the power-fail comparator output, which goes low when PFI falls below the internal 1.25 V reference. These functions are identical on both the ADM705AR and ADM706AR-REEL7.
What is the difference between the RESET and RESET (active-low) outputs?
The ADM705AR and ADM706AR-REEL7 each provide both an active-low RESET output and an active-high RESET output. The active-low RESET asserts low during a reset condition, while the active-high RESET asserts high, allowing interfacing with either active-low or active-high processor reset inputs.
Can the ADM705AR be substituted with the ADM706AR-REEL7 in an existing design?
Substitution is possible only after verifying the reset threshold requirement. The ADM706AR-REEL7's 4.40 V threshold is lower than the ADM705AR's 4.65 V threshold, so the reset assertion point relative to the 5 V supply will differ. The designer must confirm that the lower threshold still provides adequate margin for the processor's minimum operating voltage before substituting.
What is the significance of the REEL7 suffix on the ADM706AR-REEL7?
The REEL7 suffix indicates tape-and-reel packaging, typically 750 units per 7-inch reel, which is intended for automated pick-and-place assembly. The ADM705AR without this suffix is supplied in standard tube packaging. The electrical specifications of the device are unaffected by the packaging suffix.
Do both devices include a manual reset input?
Yes. Both the ADM705AR and ADM706AR-REEL7 include an active-low manual reset (MR) input that allows a system reset to be initiated by an external pushbutton or logic signal. Asserting MR forces both the RESET and RESET outputs to their active states.