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 ADM708TARZ-REEL and ADM705AR are both single-voltage supervisor ICs from the same Analog Devices ADM7xx family, sharing a common functional role and SOIC-8 footprint. The ADM708TARZ-REEL offers a higher reset threshold (4.40 V vs 4.65 V) and an additional watchdog input, making it a viable functional substitute for the ADM705AR in most supervisory applications, provided the threshold tolerance and watchdog feature are validated against the target design.
Reset Threshold Voltage
Validation required
Package Type
High match
Supply Voltage Range
High match
Watchdog Function
Validation required
Parts at a glance
Part B
ADM708TARZ-REEL
ADI公司
- Lifecycle
- Active
- Stock
- 5886 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 | ADM708TARZ-REEL | ADM705AR | Why it matters |
|---|---|---|---|
| Reset Threshold Voltage (typ) | 4.40 V | 4.65 V | Determines the supply voltage at which a reset is asserted; a lower threshold allows operation closer to the minimum supply but reduces margin against brownout. |
| Manual Reset Input | Yes | No | A manual reset pin lets the system be reset by an external pushbutton or logic signal, which is essential for user-initiated resets. |
| Watchdog Timer | Yes | No | A watchdog monitors processor activity and asserts reset if the processor hangs, improving system reliability in unattended applications. |
| Reset Output Type | Active-low push-pull and active-high push-pull | Active-low push-pull | The available reset polarity and drive style must match the processor's reset input; the dual-output device offers more flexibility. |
| Number of Supervised Voltages | 2 (VCC and one adjustable) | 1 (VCC) | Multi-voltage supervision is needed when both the main supply and a secondary rail must be monitored for valid operation. |
| Reset Timeout Delay (typ) | 200 ms | 200 ms | The reset pulse width must be long enough for the processor to initialize; matching delays preserve timing compatibility. |
| Supply Voltage Range | 1.0 V to 5.5 V | 1.0 V to 5.5 V | Defines the operating window over which the supervisor functions correctly; identical ranges ease drop-in substitution. |
| Package | 8-lead SOIC (N) | 8-lead SOIC (N) | Package and pinout must match for board-level interchangeability; identical packages allow the same footprint. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; matching ratings ensure equivalent environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM705AR | ADM708TARZ-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 | 3.08V |
| 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 ADM708TARZ-REEL and the ADM705AR?
The ADM708TARZ-REEL is a microprocessor supervisory circuit in an 8-lead SOIC package supplied on tape and reel, while the ADM705AR is a similar supervisory circuit in an 8-lead SOIC package supplied in tube form. Both monitor a single supply voltage and provide a reset output, but they differ in reset threshold voltage, reset output configuration, and packaging format. Designers should confirm the exact threshold and output type against the respective datasheets before substitution.
Do the ADM708TARZ-REEL and ADM705AR have the same reset threshold voltage?
No. The ADM708TARZ-REEL is specified with a reset threshold suitable for 3.3 V systems, while the ADM705AR is specified for 5 V systems with a different threshold voltage. The exact threshold values must be verified from the Analog Devices datasheets for each part number, as they are not interchangeable without confirming the threshold against the target supply rail.
Are the ADM708TARZ-REEL and ADM705AR pin-compatible?
Both devices are offered in an 8-lead SOIC package, but pin compatibility must be verified against the manufacturer pinout for each specific part number. The ADM708TARZ-REEL and ADM705AR may differ in reset output polarity or pin function assignment, so a direct drop-in replacement should not be assumed without comparing the official datasheet pin configurations.
What is the difference in packaging between the ADM708TARZ-REEL and ADM705AR?
The ADM708TARZ-REEL suffix "REEL" indicates tape-and-reel packaging intended for automated pick-and-place assembly, while the ADM705AR is typically supplied in tube or bulk packaging. Both use the same 8-lead SOIC body, but the packaging format affects handling, inventory, and assembly line compatibility rather than the electrical function of the device.
Can the ADM708TARZ-REEL be used as a direct replacement for the ADM705AR?
Not without validation. Although both are microprocessor supervisory circuits from Analog Devices in 8-lead SOIC packages, differences in reset threshold voltage, reset output configuration, and supply voltage range mean the ADM708TARZ-REEL is not a guaranteed drop-in replacement for the ADM705AR. The designer must compare the datasheet parameters for the target circuit and confirm compatibility before substitution.
What supply voltage range do these supervisory circuits support?
The ADM705AR is designed for 5 V supply monitoring, while the ADM708TARZ-REEL is intended for lower-voltage rails such as 3.3 V systems. The precise operating supply voltage range and reset threshold for each device should be taken from the official Analog Devices datasheet, as these parameters determine which rail each part can supervise.
Do both parts provide a manual reset input and watchdog function?
Both the ADM705 and ADM708 families are microprocessor supervisory circuits that typically include reset output and manual reset capability, and some variants include a watchdog timer. The exact feature set, including whether a watchdog is present and the reset output polarity, differs by part number and must be confirmed from the respective Analog Devices datasheet rather than assumed.