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 ADM706PAR-REEL are both single-channel microprocessor supervisory circuits from Analog Devices with matching reset threshold, reset output type, and package footprint, making them functionally interchangeable in most supervisory applications. The primary distinction is the reset timeout period, which differs between the two devices and must be validated against the system's timing requirements before substitution.
Reset Threshold Voltage
High match
Reset Output Type
High match
Package Type
High match
Reset Timeout Period
Validation required
Parts at a glance
Part B
ADM706PAR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2170 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 | ADM706PAR-REEL | 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. |
| Nominal Monitored Supply | 5 V | 3 V / 3.3 V | The device must match the logic supply rail of the system being supervised; using the wrong threshold family can cause false or missed resets. |
| Reset Output Type | Active-low push-pull | Active-low push-pull | Push-pull outputs drive the reset line directly without an external pull-up, but cannot be wire-ORed; this affects how the reset signal interfaces with the host processor. |
| Manual Reset Input | Yes | Yes | A manual reset pin allows external push-button or system logic to force a reset, a common requirement in embedded designs. |
| Watchdog Timer | Yes | Yes | The watchdog monitors processor activity and asserts reset on a hang; both parts include it, so firmware supervision behavior is comparable. |
| Reset Timeout Period (typ) | 200 ms | 200 ms | Defines how long reset stays asserted after the supply recovers; matching values ensure the processor has adequate time to initialize. |
| Supply Voltage Range | 4.75 V to 5.5 V | 1.0 V to 5.5 V | The operating range must cover the system rail; the wider low-voltage capability of the ADM706P allows use in 3 V systems where the ADM705 cannot operate. |
| Package | 8-lead SOIC | 8-lead SOIC | Identical package and pinout allow drop-in board replacement without layout changes, though electrical differences still apply. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental suitability is equivalent for typical applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM705AR | ADM706PAR-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 | 2.63V |
| 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 |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ADM705AR and ADM706PAR-REEL?
The ADM705AR is a microprocessor supervisory circuit in an 8-lead SOIC package with an active-low reset output and a manual reset input, specified over the 0°C to +70°C commercial temperature range. The ADM706PAR-REEL is a functionally similar supervisory circuit in an 8-lead SOIC package supplied in tape-and-reel packaging, with an active-low reset output and manual reset input, specified over the −40°C to +85°C industrial temperature range. The key differences are the temperature grade and the packaging format (bulk vs. tape-and-reel).
Are the ADM705AR and ADM706PAR-REEL pin-compatible?
Both devices are offered in the same 8-lead SOIC (R-8) package with the same pin functions: VCC, GND, RESET (active-low), MR (manual reset), and the remaining pins per the respective datasheets. Because both are Analog Devices supervisory ICs in the same package outline, they share a common pinout and PCB land pattern, allowing board-level interchangeability when the temperature grade and reset threshold requirements are satisfied.
What reset threshold voltages do these devices monitor?
The ADM705/ADM706 family monitors a 5 V supply with a reset threshold of 4.65 V (typical). The ADM705AR and ADM706PAR-REEL both use this 4.65 V threshold, asserting the active-low RESET output when VCC falls below the threshold and maintaining it for a reset timeout period after VCC returns above the threshold.
What is the difference in operating temperature range between the two parts?
The ADM705AR is specified for the commercial temperature range of 0°C to +70°C. The ADM706PAR-REEL is specified for the industrial temperature range of −40°C to +85°C. Designs operating outside 0°C to +70°C should use the industrial-grade ADM706PAR-REEL.
What does the "REEL" suffix indicate on the ADM706PAR-REEL?
The "REEL" suffix indicates that the device is supplied in tape-and-reel packaging, which is intended for automated pick-and-place assembly lines. The ADM705AR is typically supplied in tube or bulk packaging. The electrical specifications are the same; only the shipping/packaging format differs.
Do both devices include a manual reset input?
Yes. Both the ADM705AR and ADM706PAR-REEL include a manual reset (MR) input that allows a system to be reset by an external pushbutton or logic signal. Asserting MR low forces the active-low RESET output low, and releasing MR starts the reset timeout period.
Can the ADM705AR be used as a drop-in replacement for the ADM706PAR-REEL?
Because both are 8-lead SOIC devices with the same pinout and 4.65 V reset threshold, the ADM705AR can function as a replacement for the ADM706PAR-REEL in applications that remain within the 0°C to +70°C commercial temperature range. For industrial temperature applications, the ADM706PAR-REEL should be retained. Always verify against the latest manufacturer datasheet before substitution.
What is the reset timeout delay for these supervisory circuits?
The ADM705/ADM706 family provides a reset timeout delay of 200 ms (typical) after VCC rises above the reset threshold or after the manual reset input is released. This delay ensures the microprocessor has stabilized before code execution begins.