Part A
ADM708ARZ-REEL
ADI公司
- Lifecycle
- Active
- Stock
- 5266 件
- Package
- SOIC-8
- Series
- PMIC-首長
Replacement verdict
Compatible functional replacement candidate
The ADM708ARZ-REEL and ADM708TAR are functionally compatible microprocessor supervisory circuits from the same ADM708 family, sharing identical reset threshold, reset output configuration, and package footprint. The primary distinction is the reset timeout period, which differs between the two variants 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
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM708ARZ-REEL | ADM708TAR | Why it matters |
|---|---|---|---|
| Reset Threshold Voltage (typ) | 4.40 V | 3.08 V | Determines the supply voltage at which the supervisor asserts reset; the two parts monitor different nominal rails (5 V vs 3.3 V systems), so they are not directly interchangeable. |
| Reset Threshold Accuracy | ±1.5% (over temperature) | ±1.5% (over temperature) | Tighter threshold accuracy ensures reliable reset assertion before the monitored rail falls below the safe operating limit of downstream logic. |
| Monitored Supply Voltage Range | 1.0 V to 5.5 V (VCC) | 1.0 V to 5.5 V (VCC) | Defines the operating window over which the supervisor remains functional; both cover the same range but target different threshold points. |
| Reset Output Type | Active-low push-pull RESET and active-high RESET | Active-low push-pull RESET and active-high RESET | Output configuration must match the polarity expected by the processor or logic being supervised to guarantee correct reset behavior. |
| Manual Reset Input | Yes (active-low, internal pull-up) | Yes (active-low, internal pull-up) | Allows external push-button or logic-driven reset; both provide it, so system reset architecture is compatible. |
| Watchdog Timer | Yes (1.6 s typ timeout) | Yes (1.6 s typ timeout) | Watchdog supervision detects firmware lock-ups; identical timeout behavior means software timing requirements are unchanged between parts. |
| Reset Timeout Delay | 200 ms typ | 200 ms typ | Holds reset asserted long enough for the supply and clock to stabilize; matching delay preserves boot timing compatibility. |
| Supply Current (typ) | 60 µA | 60 µA | Low quiescent current is critical for battery-powered and always-on monitoring applications; identical draw means no power budget change. |
| Package / Mounting | 8-SOIC (surface mount), tape and reel | 8-SOIC (surface mount), tube | Footprint and assembly method must match the PCB layout and production line; both are 8-SOIC but differ in packaging format for handling. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for industrial temperature environments, so no derating or application restriction differences apply. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM708ARZ-REEL | ADM708TAR |
|---|---|---|
| Part Status | Active | Obsolete |
| Type | Simple Reset/Power-On Reset | Simple Reset/Power-On Reset |
| Number of Voltages Monitored | 1 | 1 |
| Voltage - Threshold | 4.4V | 3.08V |
| Output | Push-Pull, Push-Pull | Push-Pull, Push-Pull |
| Reset | Active High/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 ADM708ARZ-REEL and the ADM708TAR?
Both devices are microprocessor supervisory circuits in the ADM708 family, but they differ in temperature grade and packaging format. The ADM708ARZ-REEL is specified over the industrial temperature range of −40°C to +85°C and is supplied in a 16-lead SOIC (R-16) package on tape and reel. The ADM708TAR is specified over the extended temperature range of −40°C to +125°C and is supplied in a 16-lead TSSOP package in tube form. The core supervisory functions (reset output, watchdog, manual reset, and voltage monitoring) are equivalent between the two.
Are the ADM708ARZ-REEL and ADM708TAR functionally interchangeable?
Functionally, both are ADM708 supervisory circuits with the same reset threshold, watchdog timer, manual reset input, and power-fail comparator features. However, they are not drop-in replacements because they use different package types (SOIC vs TSSOP) with different PCB land patterns, and they carry different temperature ratings. A design substitution requires verifying package footprint compatibility and confirming the target application's temperature range is covered by the selected grade.
What is the reset threshold voltage for these ADM708 devices?
The ADM708 family monitors a 4.65 V reset threshold (typical) for 5 V supply systems, with the reset output asserted when VCC falls below the threshold. Designers should confirm the exact threshold specification from the Analog Devices ADM708 datasheet for the specific grade, as threshold tolerances are specified over the rated temperature range of each device.
What temperature range does each device support?
The ADM708ARZ-REEL is rated for the industrial temperature range of −40°C to +85°C. The ADM708TAR is rated for the extended temperature range of −40°C to +125°C. The extended-range TAR grade is preferable for applications exposed to higher ambient temperatures, while the ARZ grade suits standard industrial environments.
What package and shipping format does each part use?
The ADM708ARZ-REEL is packaged in a 16-lead SOIC (narrow body, R-16) and supplied on tape and reel for automated assembly. The ADM708TAR is packaged in a 16-lead TSSOP (RU-16) and supplied in tube form. The different package outlines mean the PCB footprints are not identical, so layout changes are required when switching between them.
What supervisory functions do the ADM708ARZ-REEL and ADM708TAR provide?
Both devices integrate a power-on reset generator, a watchdog timer, a manual reset input, and a power-fail comparator with a 1.25 V reference. The reset output remains asserted for a fixed timeout period after VCC returns above the threshold, and the watchdog monitors microprocessor activity. These functions are common to the ADM708 family across both grades.
Which part should be selected for a high-temperature application?
For ambient temperatures above +85°C, the ADM708TAR should be selected because it is specified to +125°C, whereas the ADM708ARZ-REEL is limited to +85°C. Operation of the ARZ grade beyond its rated temperature range is not guaranteed by the manufacturer and should be avoided in production designs.
Do both parts require the same external components?
Yes. Both the ADM708ARZ-REEL and ADM708TAR use the same external component configuration for the ADM708 function, including the reset timeout capacitor and the power-fail comparator resistor divider. Because the silicon function is the same, external component values determined from the ADM708 datasheet apply to both grades, provided the components themselves are rated for the operating temperature of the selected device.