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-REEL are functionally compatible supervisor ICs from the same family, sharing identical reset threshold, reset output type, and supply voltage range, with the only meaningful distinction being the reset timeout delay period. The ADM706AR-REEL offers a longer reset timeout, making it a viable drop-in candidate where extended reset assertion is acceptable or desired, though the timeout difference should be validated against the target system's timing requirements.
Reset Threshold Voltage
High match
Reset Output Type
High match
Supply Voltage Range
High match
Reset Timeout Delay
Validation required
Parts at a glance
Part B
ADM706AR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3653 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-REEL | Why it matters |
|---|---|---|---|
| Reset Threshold Voltage (typ) | 4.65 V | 4.40 V | Determines the supply voltage level at which the supervisor asserts reset; a lower threshold allows operation closer to the minimum valid supply, affecting brownout detection margin. |
| Watchdog Timeout Period (typ) | 1.6 s | 1.6 s | Sets how long the processor has to strobe the watchdog input before a reset is issued; must match firmware servicing intervals. |
| Manual Reset Input | Yes (active-low MR) | Yes (active-low MR) | Allows an external pushbutton or logic signal to force a system reset; needed for user-initiated or supervisory resets. |
| Reset Output Type | Active-low push-pull RESET | Active-low push-pull RESET | Defines the output drive style; push-pull provides a defined logic level without an external pull-up, simplifying interfacing to the processor reset pin. |
| Supply Voltage Range | 4.75 V to 5.5 V | 4.75 V to 5.5 V | Specifies the valid operating supply window; both parts target 5 V systems and must be powered within this range for correct supervision. |
| Supply Current (typ) | 190 µA | 190 µA | Quiescent current draw affects overall system power budget, especially in always-on supervisory circuits. |
| Reset Timeout Delay (typ) | 200 ms | 200 ms | Holds the processor in reset after the supply recovers, ensuring the clock and logic stabilize before code execution begins. |
| Package | 8-lead SOIC (N) | 8-lead SOIC (N), tape and reel | Footprint and assembly format must match the PCB layout and production pick-and-place process; the reel variant suits automated high-volume assembly. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms the parts are rated for industrial temperature environments, which is required for reliable operation across the application's thermal range. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM705AR | ADM706AR-REEL |
|---|---|---|
| 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-REEL?
Both are Analog Devices microprocessor supervisory circuits in 8-lead SOIC packages with active-low reset outputs, 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-REEL has a reset threshold of 4.40 V. The ADM705AR is supplied in tube/standard packaging, whereas the ADM706AR-REEL is supplied on tape and reel for automated assembly.
Are the ADM705AR and ADM706AR-REEL pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions: VCC, GND, RESET (active-low), RESET (active-high), WDI, PFO, PFI, and MR. This allows them to share the same PCB land pattern, though the differing reset thresholds must be validated for the target supply rail.
What reset threshold voltage does each device use?
The ADM705AR asserts reset when VCC falls below 4.65 V, while the ADM706AR-REEL asserts reset when VCC falls below 4.40 V. The choice depends on the nominal supply voltage and the allowable tolerance of the monitored rail.
Can the ADM706AR-REEL be used as a drop-in replacement for the ADM705AR?
Not without validation. Although pin-compatible, the ADM706AR-REEL has a lower reset threshold (4.40 V versus 4.65 V), which changes the point at which the system is reset. The replacement must be verified against the supply tolerance and reset requirements of the target design.
What is the difference in packaging between the ADM705AR and ADM706AR-REEL?
The ADM705AR is supplied in standard tube packaging, while the ADM706AR-REEL is supplied on tape and reel (suffix -REEL) intended for high-volume automated pick-and-place assembly. Both use the same 8-lead SOIC body.
Do both devices include a watchdog timer and manual reset input?
Yes. Both the ADM705AR and ADM706AR-REEL integrate a watchdog timer, a manual reset (MR) input, and a power-fail comparator (PFI/PFO) in addition to the reset output, making them functionally equivalent supervisory circuits apart from the reset threshold and packaging.
What supply voltage range do these supervisors support?
Both devices are designed for 5 V systems and operate from a VCC supply in the 1.0 V to 5.5 V range for reset assertion, with normal monitoring intended for a nominal 5 V rail. The ADM705AR monitors for a 4.65 V threshold and the ADM706AR-REEL for a 4.40 V threshold.