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Analog Devices Inc. ADM8321WAX30ARJZR7
- Part No.:
- ADM8321WAX30ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8321WAX30ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
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Product details
Overview
ADM8321WAX30ARJZR7 from Analog Devices is an automotive-qualified supervisory circuit with watchdog timer and manual reset input, configured for 3.0 V reset threshold, 1 ms minimum reset timeout, and 102 ms typical watchdog timeout. It features open-drain active-low RESET output and push-pull active-high RESET output in a 5-lead SOT-23 package, operating across −40°C to +125°C for microprocessor voltage monitoring in infotainment systems.
For engineers reviewing the ADM8321WAX30ARJZR7 datasheet, ADM8321WAX30ARJZR7 pinout, ADM8321WAX30ARJZR7 application, or ADM8321WAX30ARJZR7 equivalent, key selection considerations include its dual-reset output architecture, automotive qualification, 10 µA supply current at 3.6 V, and compatibility with brownout detection and code-execution integrity monitoring in embedded control units.
Technical Context
The ADM8321WAX30ARJZR7 integrates a precision voltage monitor with factory-trimmed 3.0 V reset threshold (±1.5% over temperature), a watchdog timer cleared by WDI transitions (50 ns pulse width supported), and independent manual reset input with 75 kΩ internal pull-up. Its dual-output stage delivers both open-drain active-low and push-pull active-high reset signals, enabling flexible interface to diverse microcontroller reset inputs.
Reset assertion occurs on VCC drop below 3.0 V, MR low pulse >1 µs, or WDI inactivity beyond 102 ms (typical); reset remains asserted for ≥1 ms after recovery. The device guarantees valid outputs down to VCC = 0.9 V and consumes only 10–18 µA across its 0.9–5.5 V operating range, supporting low-power automotive and industrial applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.0 V ±1.5% over −40°C to +125°C - ensures reliable brownout detection for 3.3 V rail systems |
| Reset Timeout | 1 ms minimum - provides fast, deterministic reset hold time after power recovery |
| Watchdog Timeout | 102 ms typical - balances responsiveness to firmware hangs with tolerance for brief delays |
| Supply Current | 10 µA at 3.6 V - enables integration into always-on automotive modules without battery drain |
| Operating Temp | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and infotainment use |
| Output Types | Open-drain active-low RESET + push-pull active-high RESET - supports mixed-voltage MCU interfaces |
| WDI Pulse Width | 50 ns minimum - allows efficient low-duty-cycle watchdog strobing to minimize input current |
Pinout & Package
ADM8321WAX30ARJZR7 is housed in a 5-lead SOT-23 (RJ-5) package, measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads optimized for automated assembly and thermal performance in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output requiring external pull-up; sinks 1.2 mA at VCC ≥ 2.7 V |
| 2 | GND | Ground reference for all internal circuits and reset timing accuracy |
| 3 | RESET (push-pull) | Active-high reset output; sources 500 µA at VCC ≥ 2.7 V, valid down to VCC = 0.9 V |
| 4 | WDI | Watchdog input; toggled by host MCU to prevent timeout; 35–100 µA input current when driven high |
| 5 | VCC | Monitored supply rail; device operates from 0.9 V to 5.5 V, asserting reset below 3.0 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | Simultaneous open-drain active-low and push-pull active-high RESET signals simplify interface to heterogeneous MCUs |
| Automotive qualification | W-suffix device manufactured under controlled process for AEC-Q100 Grade 1 reliability in automotive infotainment and body control |
| Low-power operation | 10 µA supply current at 3.6 V enables use in battery-backed or always-on subsystems without compromising runtime |
| Glitch-immune MR input | 100 ns MR glitch rejection and integrated debounce eliminate need for external RC filtering in noisy environments |
| Factory-trimmed threshold | 3.0 V reset point trimmed to ±1.5% over full temperature range - eliminates external resistor calibration |
Applications
| Automotive Infotainment | Engine Control Unit (ECU) |
|---|---|
|
Use Scenario: Power sequencing and firmware crash recovery in head-unit processors during cold cranking or load dump events. IC Role / Device Role / Timing Role: Monitors 3.3 V domain; asserts dual reset signals on undervoltage or WDI timeout to force clean MCU reboot. Use Value: Prevents frozen UI states by guaranteeing reset within 1 ms of VCC recovery and detecting unresponsive firmware via 102 ms watchdog window. |
Use Scenario: Ensuring deterministic startup and fault recovery in safety-critical engine management microcontrollers. IC Role / Device Role / Timing Role: Supervises main 5 V supply; generates synchronized active-low and active-high reset pulses aligned to power rail stability. Use Value: Dual outputs enable direct connection to legacy and modern MCUs without level-shifting, while −40°C to +125°C operation ensures reliability under hood conditions. |
| ADAS Camera Module | Industrial PLC Controller |
|
Use Scenario: Maintaining image pipeline integrity during transient EMI-induced processor lockups in surround-view camera systems. IC Role / Device Role / Timing Role: Watches WDI strobes from ISP firmware; triggers reset if no transition occurs within 102 ms, restoring video stream. Use Value: 50 ns WDI pulse width support allows minimal overhead strobing, reducing dynamic power while ensuring rapid hang detection. |
Use Scenario: Providing fail-safe reset coordination between FPGA configuration logic and ARM-based real-time control processors. IC Role / Device Role / Timing Role: Supplies independent active-low and active-high reset signals to match FPGA I/O bank voltage and ARM reset pin requirements. Use Value: Eliminates need for discrete reset translators or dual supervisor ICs, reducing BOM count and board area in space-constrained PLC designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8321WAY30ARJZR7 | Same package, pinout, and reset threshold; watchdog timeout = 1.6 sec (typical) vs. 102 ms | Better suited for applications requiring longer watchdog windows to accommodate complex boot sequences | Select when firmware execution time exceeds 100 ms but must remain within 1.6 sec watchdog window |
| TPS3808G30DBVR | Single active-low open-drain reset output; 3.0 V threshold; 200 ms watchdog timeout; 2.5 µA quiescent current | Lacks dual-output capability and automotive qualification; rated for −40°C to +125°C but not AEC-Q100 certified | Choose for cost-sensitive industrial applications where dual reset outputs and automotive compliance are not required |
Compared with ADM8321WAX30ARJZR7, ADM8321WAY30ARJZR7 extends watchdog coverage for longer boot routines, while TPS3808G30DBVR reduces power consumption but sacrifices automotive qualification and dual-output flexibility-making ADM8321WAX30ARJZR7 optimal for safety-aware automotive designs needing coordinated reset signaling.
Availability
ADM8321WAX30ARJZR7 is available at Aetrix Electronics and suitable for automotive infotainment, engine control units, and ADAS camera modules requiring stable component supply with guaranteed long-term availability and AEC-Q100 compliance.
Supply support for ADM8321WAX30ARJZR7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The ADM8321WAX30ARJZR7 belongs to the ADM83xx family of automotive-grade supervisory circuits designed specifically for robust power monitoring and watchdog protection in microprocessor-based automotive and industrial control systems.
FAQ
What is the reset threshold voltage of the ADM8321WAX30ARJZR7?
The ADM8321WAX30ARJZR7 has a factory-trimmed reset threshold of 3.0 V, specified with ±1.5% tolerance over the full operating temperature range of −40°C to +125°C. This value is confirmed in Table 9 and the Ordering Guide section of the datasheet, where "X30" denotes the 3.0 V option. The threshold is internally generated via a precision voltage divider, eliminating the need for external resistive setting.
Does the ADM8321WAX30ARJZR7 support both active-low and active-high reset outputs?
Yes, the ADM8321WAX30ARJZR7 provides two independent reset outputs: Pin 1 is an open-drain active-low RESET, and Pin 3 is a push-pull active-high RESET. This dual-output architecture is explicitly defined in Figure 4 and Table 4 of the datasheet, enabling direct interfacing with MCUs that require either polarity without external logic translation.
What is the watchdog timeout period for the ADM8321WAX30ARJZR7?
The ADM8321WAX30ARJZR7 has a typical watchdog timeout of 102 ms, corresponding to the "X" suffix in its part number per Table 8. The datasheet specifies minimum/typical/maximum values of 72/102/132 ms at TA = 25°C. This timeout is cleared on any WDI logic transition and is disabled if WDI is left floating.
Is the ADM8321WAX30ARJZR7 qualified for automotive applications?
Yes, the "W" suffix in ADM8321WAX30ARJZR7 indicates it is an automotive-grade device, qualified per AEC-Q100 Grade 1 (−40°C to +125°C) with controlled manufacturing and reliability testing. The Automotive Products section (page 16) confirms this qualification, and the Ordering Guide lists it explicitly as a W-suffix model.
What package type does the ADM8321WAX30ARJZR7 use?
The ADM8321WAX30ARJZR7 uses a 5-lead SOT-23 package, designated RJ-5 in the Outline Dimensions section (page 15). Its mechanical dimensions (2.9 mm × 1.6 mm × 1.1 mm) and lead configuration are standardized per JEDEC MO-178, and the package is RoHS-compliant ("Z" suffix).
ADM8321WAX30ARJZR7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8321WAX30ARJZR7 FAQ
1.How can I place an order for ADM8321WAX30ARJZR7 through Aetrix?
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6.How does Aetrix verify that ADM8321WAX30ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8321WAX30ARJZR7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADM8321WAX30ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8321WAX30ARJZR7?
All ADM8321WAX30ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8321WAX30ARJZR7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADM8321WAX30ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8321WAX30ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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