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Analog Devices Inc. ADM8324WAH29ARJZR7
- Part No.:
- ADM8324WAH29ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8324WAH29ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,095
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Product details
Overview
ADM8324WAH29ARJZR7 from Analog Devices is an automotive-qualified supervisory circuit with windowed watchdog, 2.93 V reset threshold, 768 ms fast timeout / 1.24 sec slow timeout, and open-drain RESET output in 5-lead SOT-23. It monitors microprocessor supply voltage and code execution integrity during power-up, brownout, and runtime faults in engine control units and ADAS modules.
For engineers reviewing the ADM8324WAH29ARJZR7 datasheet, ADM8324WAH29ARJZR7 pinout, ADM8324WAH29ARJZR7 application, or ADM8324WAH29ARJZR7 equivalent, key selection criteria include its automotive-grade −40°C to +125°C operation, factory-trimmed 2.93 V reset threshold with ±1.5% tolerance over temperature, open-drain RESET output requiring external pull-up, and fixed windowed watchdog configuration (Option H) enabling detection of both fast and slow WDI pulse violations.
Technical Context
The ADM8324WAH29ARJZR7 implements a dual-window watchdog architecture: fast timeout (768 ms typ) detects premature WDI pulses, while slow timeout (1.24 sec typ) catches missed pulses-both measured from the last falling edge of WDI. Its reset generator asserts active-low RESET when VCC drops below 2.93 V (±1.5% over −40°C to +125°C), MR is pulled low, or WDI violates either watchdog window.
It features an internal 75 kΩ MR pull-up, 100 ns MR glitch rejection, 200 ns minimum WDI pulse width support, and guaranteed RESET validity down to VCC = 0.9 V. The open-drain RESET output requires an external pull-up resistor and sinks up to 3.2 mA at VCC ≥ 4.5 V with VOL ≤ 0.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±1.5% over −40°C to +125°C - factory-trimmed for precise brownout detection in automotive ECUs |
| Watchdog Fast Timeout | 768 ms typical - detects WDI pulses too close together, preventing spurious resets from noise or jitter |
| Watchdog Slow Timeout | 1.24 sec typical - triggers reset if WDI remains inactive, indicating firmware lockup or crash |
| Reset Timeout | 1 ms minimum - ensures sufficient reset pulse width for reliable microprocessor initialization |
| Supply Current | 10 µA typical at 5.5 V - enables use in always-on automotive subsystems without excessive battery drain |
| Operating Temperature | −40°C to +125°C - qualified per AEC-Q100 for under-hood and safety-critical applications |
| Output Type | Open-drain RESET - allows level-shifting and wired-OR configuration with other reset sources |
Pinout & Package
ADM8324WAH29ARJZR7 is housed in a RoHS-compliant 5-lead SOT-23 package (JEDEC MO-178-AA, package code RJ-5), measuring 2.90 mm × 1.60 mm × 1.15 mm, with gull-wing leads and 0.95 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain reset output | Sinks current to assert reset; requires external pull-up; valid down to VCC = 0.9 V |
| 2 (GND) | Ground reference | Primary return path for all internal circuits and RESET sink current |
| 3 (MR) | Active-low manual reset input | Internally pulled up to VCC via 75 kΩ; 100 ns glitch rejection; de-bounced on-chip |
| 4 (WDI) | Windowed watchdog input | Edge-sensitive; clears watchdog on each falling edge; 200 ns min pulse width; must not float |
| 5 (VCC) | Monitored supply voltage input | Input range 0.9 V to 5.5 V; powers device and serves as voltage reference for reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Dual-threshold detection prevents false resets from WDI jitter while catching true firmware hangs |
| Automotive qualification | AEC-Q100 Grade 1 certified with controlled manufacturing and extended reliability reporting |
| Factory-trimmed reset threshold | 2.93 V with ±1.5% tolerance over full temperature range eliminates need for external resistor networks |
| Low quiescent current | 10 µA typical enables integration into battery-backed systems without compromising runtime |
| Integrated MR debounce | On-chip filtering removes mechanical switch bounce, eliminating need for external RC network |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors 3.3 V or 5 V supply rails and software execution in real-time engine management systems subject to voltage transients and thermal stress. IC Role / Device Role / Timing Role: Supervisory IC providing undervoltage reset, manual reset via diagnostic port, and windowed watchdog supervision of main MCU's heartbeat signal. Use Value: Prevents ECU from operating in undefined state during cold cranking or load dump events; dual-window watchdog distinguishes between transient noise and actual firmware failure. | Use Scenario: Ensures fail-safe behavior in radar processing units and camera modules where continuous software monitoring is required for functional safety (ISO 26262). IC Role / Device Role / Timing Role: System-level supervisor asserting hardware reset upon VCC dropout or loss of WDI activity from vision processor. Use Value: Meets ASIL-B requirements by guaranteeing deterministic reset response within 1 ms after fault detection, independent of software state. |
| Infotainment Head Unit | Body Control Module (BCM) |
Use Scenario: Manages power sequencing and runtime integrity of multi-core application processors handling navigation, audio, and connectivity stacks. IC Role / Device Role / Timing Role: Voltage monitor and watchdog co-processor that interfaces with PMIC and main SoC via dedicated WDI and MR lines. Use Value: Enables graceful recovery from UI freezes without full system reboot; open-drain RESET supports shared reset bus with other peripherals. | Use Scenario: Supervises microcontrollers managing door locks, lighting, and climate functions in distributed vehicle networks. IC Role / Device Role / Timing Role: Standalone reset controller with manual reset input for service mode and windowed watchdog tied to CAN gateway firmware heartbeat. Use Value: Supports long-term reliability in high-cycle environments; 125°C rating ensures stable operation near HVAC ducts or fuse boxes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324US29D3+T | Single-window watchdog (not windowed), 2.93 V threshold, push-pull RESET, 1.5 µA supply current | Lacks dual-window fault discrimination; better suited for simpler systems without stringent noise immunity needs | Select when lowest power is critical and watchdog false-trigger risk is acceptable |
| TPS3808G33DBVR | Fixed 3.3 V threshold, no watchdog, 1.25 ms reset timeout, 2.5 µA supply current, SOT-23-5 | No WDI functionality; only provides voltage monitoring and manual reset | Select when only supply supervision is needed and watchdog is handled separately in firmware or another IC |
Compared with MAX6324US29D3+T and TPS3808G33DBVR, ADM8324WAH29ARJZR7 uniquely delivers automotive-grade windowed watchdog supervision with factory-trimmed 2.93 V threshold and open-drain output-enabling robust fault detection in safety-critical embedded systems where distinguishing between noise and true failure is essential.
Availability
ADM8324WAH29ARJZR7 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, infotainment head units, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for ADM8324WAH29ARJZR7 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The ADM8324 product line delivers automotive-qualified supervisory circuits with windowed watchdog capability, designed specifically for functional safety-critical microprocessor systems in harsh-temperature automotive environments.
FAQ
What is the reset threshold voltage of the ADM8324WAH29ARJZR7?
The ADM8324WAH29ARJZR7 has a factory-trimmed reset threshold of 2.93 V, with tolerance of ±1% at 25°C and ±1.5% over the full operating temperature range of −40°C to +125°C. This precise threshold ensures reliable undervoltage detection in automotive power rails without external calibration components.
Does the ADM8324WAH29ARJZR7 support manual reset functionality?
Yes, the ADM8324WAH29ARJZR7 includes a dedicated active-low manual reset input (MR) with integrated 75 kΩ internal pull-up resistor and 100 ns glitch rejection. When MR is pulled low for longer than the internal debounce time, it asserts the RESET output for the full reset timeout period (1 ms minimum), enabling field service or diagnostic reset initiation.
What type of RESET output does the ADM8324WAH29ARJZR7 provide?
The ADM8324WAH29ARJZR7 provides an active-low open-drain RESET output (Pin 1). This requires an external pull-up resistor to a compatible voltage rail (≤ VCC) and supports wired-OR configurations with other reset sources. It sinks up to 3.2 mA at VCC ≥ 4.5 V with VOL ≤ 0.3 V, ensuring compatibility with standard logic inputs.
What watchdog timeout options are configured in the ADM8324WAH29ARJZR7?
The ADM8324WAH29ARJZR7 is configured with Watchdog Timeout Option H: fast timeout of 768 ms (typical) and slow timeout of 1.24 sec (typical). These values are factory-set and non-adjustable; they define the upper and lower bounds of the valid WDI pulse window, enabling detection of both premature and missing watchdog toggles.
Is the ADM8324WAH29ARJZR7 qualified for automotive applications?
Yes, the ADM8324WAH29ARJZR7 is explicitly qualified for automotive applications, indicated by the "W" suffix in its ordering code. It meets AEC-Q100 Grade 1 requirements (−40°C to +125°C), undergoes controlled manufacturing, and is supported by Automotive Reliability reports-making it suitable for engine control, ADAS, and other safety-relevant vehicle systems.
ADM8324WAH29ARJZR7 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:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- 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
ADM8324WAH29ARJZR7 FAQ
1.How can I place an order for ADM8324WAH29ARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8324WAH29ARJZR7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADM8324WAH29ARJZR7 reliable?
The price and inventory of ADM8324WAH29ARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8324WAH29ARJZR7 is usually 5 days.
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ADM8324WAH29ARJZR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8324WAH29ARJZR7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADM8324WAH29ARJZR7?
For technical support, including ADM8324WAH29ARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8324WAH29ARJZR7 requirements.
6.How does Aetrix verify that ADM8324WAH29ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8324WAH29ARJZR7 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 ADM8324WAH29ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8324WAH29ARJZR7?
All ADM8324WAH29ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8324WAH29ARJZR7, 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 ADM8324WAH29ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8324WAH29ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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