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Analog Devices Inc. ADM8324WCA46ARJZR7
- Part No.:
- ADM8324WCA46ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8324WCA46ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,208
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Product details
Overview
ADM8324WCA46ARJZR7 from Analog Devices is an automotive-qualified supervisory circuit with windowed watchdog, 4.63 V reset threshold, 1.5 ms fast watchdog timeout, 10 ms slow watchdog timeout, and 140 ms reset timeout. It monitors microprocessor supply voltage integrity and code execution in engine control units and ADAS modules.
For engineers reviewing the ADM8324WCA46ARJZR7 datasheet, ADM8324WCA46ARJZR7 pinout, ADM8324WCA46ARJZR7 application, or ADM8324WCA46ARJZR7 equivalent, key selection criteria include its open-drain RESET output, −40°C to +125°C operation, 5-lead SOT-23 package, and automotive qualification per AEC-Q100.
Technical Context
The ADM8324WCA46ARJZR7 implements a dual-window watchdog timer that detects both fast errors (WDI pulses too close) and slow errors (no pulse within timeout), with factory-trimmed 4.63 V reset threshold and 140 ms reset timeout. Its open-drain RESET output requires an external pull-up and remains asserted during VCC brownout, MR assertion, or watchdog fault.
It features internal 75 kΩ MR pull-up, 200 ns WDI pulse width support, 100 ns glitch rejection on MR and WDI, and guaranteed operation down to VCC = 0.9 V. Supply current is 10 µA typical at 5.5 V, enabling use in always-on automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±1.5% over −40°C to +125°C - ensures reliable reset assertion during battery undervoltage in automotive 5 V rails. |
| Reset Timeout | 140 ms minimum - provides sufficient hold time for microprocessor initialization after power recovery. |
| Watchdog Fast Timeout | 1.5 ms typical - detects rapid software hangs such as infinite loops or ISR lockup. |
| Watchdog Slow Timeout | 10 ms minimum - catches longer-duration execution faults like task starvation or scheduler failure. |
| Supply Current | 10 µA typical at 5.5 V - enables integration into low-power always-on domains without compromising battery life. |
| Operating Temperature | −40°C to +125°C - meets under-hood automotive ambient requirements per AEC-Q100 Grade 1. |
| Output Type | Open-drain RESET - allows level-shifting and wired-OR configuration with other system reset sources. |
Pinout & Package
ADM8324WCA46ARJZR7 is housed in a RoHS-compliant 5-lead SOT-23 (RJ-5) package, 2.90 mm × 1.60 mm × 1.15 mm, qualified for automotive use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low during VCC undervoltage, MR assertion, or watchdog fault; requires external pull-up to host rail. |
| 2 - GND | Ground reference | System ground return path for all internal comparators and logic; must be low-impedance for noise immunity. |
| 3 - MR | Manual reset input | Active-low input with 75 kΩ internal pull-up; debounced to reject <100 ns glitches; asserts RESET when held low >1 µs. |
| 4 - WDI | Windowed watchdog input | Accepts 200 ns minimum pulses; clears watchdog on each falling edge; ignored during RESET assertion. |
| 5 - VCC | Monitored supply input | Input voltage source for internal bandgap and comparators; operates from 0.9 V to 5.5 V; guarantees RESET validity down to 0.9 V. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Dual-fault detection (fast and slow) prevents false resets from transient noise while catching both short- and long-duration firmware hangs. |
| Automotive qualification | AEC-Q100 Grade 1 certified with controlled manufacturing - supports functional safety requirements in ASIL-B systems. |
| Factory-trimmed reset threshold | 4.63 V ±1.5% over full temperature range - eliminates need for external resistor dividers and improves system accuracy. |
| Low quiescent current | 10 µA typical - reduces parasitic drain in vehicle sleep modes, extending battery standby time. |
| Integrated MR debounce | On-chip 100 ns glitch filter and 75 kΩ pull-up - removes need for external RC network and simplifies push-button interface design. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors 5 V supply and main MCU execution in gasoline/diesel engine management systems subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervisory circuit providing undervoltage reset, manual reset via diagnostic port, and windowed watchdog supervision of safety-critical firmware. Use Value: Prevents ECU lockup during cranking by asserting RESET until VCC stabilizes above 4.63 V, and detects firmware stalls via 1.5/10 ms watchdog windows. | Use Scenario: Ensures reliable boot and runtime integrity of vision-based ADAS controllers operating in high-temperature cabin environments. IC Role / Device Role / Timing Role: System-level supervisor monitoring SoC supply and executing periodic watchdog checks on perception stack execution timing. Use Value: Guarantees 140 ms reset pulse duration for full SoC initialization and leverages −40°C to +125°C operation for sustained reliability near windshield-mounted cameras. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Manages power sequencing and firmware health in distributed BCM nodes controlling lighting, door locks, and HVAC. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog enforcer interfacing with 8-bit/32-bit MCUs across multiple CAN/LIN domains. Use Value: Open-drain RESET enables wired-OR with other subsystem supervisors; 10 µA supply current minimizes impact on always-on battery budget. | Use Scenario: Provides fail-safe reset coordination between application processor, audio DSP, and display controller in automotive infotainment platforms. IC Role / Device Role / Timing Role: Centralized reset arbiter using manual reset input for factory diagnostics and windowed watchdog for UI thread monitoring. Use Value: Factory-trimmed 4.63 V threshold matches typical infotainment 5 V rail tolerance; 140 ms timeout accommodates multi-stage boot loaders. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V reset threshold; no windowed watchdog (single timeout); push-pull RESET output. | Suitable for non-automotive 3.3 V systems only; lacks dual-fault watchdog detection required for ASIL-B compliance. | Select only if 3.3 V rail monitoring suffices and automotive qualification is not required. |
| MAX6326UT46D3+ | 4.63 V reset threshold; no watchdog; 140 ms reset timeout; open-drain RESET; −40°C to +125°C. | Provides basic voltage supervision only; cannot detect or recover from firmware execution errors. | Choose when watchdog functionality is unnecessary and cost sensitivity outweighs functional safety needs. |
Compared with TPS3808G33DBVR and MAX6326UT46D3+, the ADM8324WCA46ARJZR7 uniquely combines automotive qualification, open-drain flexibility, and windowed watchdog capability - essential for detecting both fast and slow firmware faults in safety-critical ECUs.
Availability
ADM8324WCA46ARJZR7 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and infotainment head units requiring stable component supply across automotive production lifecycles.
Supply support for ADM8324WCA46ARJZR7 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.
The ADM8324 product line delivers automotive-grade supervisory circuits with windowed watchdog functionality, designed specifically for functional safety–critical microprocessor systems in harsh automotive environments.
FAQ
What is the reset threshold voltage of the ADM8324WCA46ARJZR7?
The ADM8324WCA46ARJZR7 has a factory-trimmed nominal reset threshold of 4.63 V, with tolerance of ±1% at 25°C and ±1.5% over the full −40°C to +125°C operating range. This value is confirmed in Table 6 of the Rev. B datasheet and corresponds to Reset Threshold Number 46 in the ordering guide.
Does the ADM8324WCA46ARJZR7 support windowed watchdog functionality?
Yes, the ADM8324WCA46ARJZR7 implements a true windowed watchdog timer with independent fast and slow timeout windows - 1.5 ms (typical) fast timeout and 10 ms (minimum) slow timeout. This dual-window architecture detects both rapid firmware hangs and prolonged execution failures, as detailed in the Theory of Operation section.
What type of RESET output does the ADM8324WCA46ARJZR7 provide?
The ADM8324WCA46ARJZR7 provides an active-low open-drain RESET output, requiring an external pull-up resistor to a compatible voltage rail. This differs from the push-pull output of the ADM8323 family and enables wired-OR reset bus configurations common in automotive systems.
Is the ADM8324WCA46ARJZR7 qualified for automotive applications?
Yes, the ADM8324WCA46ARJZR7 is explicitly qualified for automotive use, indicated by the "W" suffix and −40°C to +125°C temperature grade. It meets AEC-Q100 requirements and is manufactured under controlled processes for automotive reliability, as stated in the Automotive Products section of the datasheet.
What is the supply current consumption of the ADM8324WCA46ARJZR7?
The ADM8324WCA46ARJZR7 consumes 10 µA typical supply current at 5.5 V and 25°C, rising to 20 µA maximum. At 3.6 V, typical current is 10 µA with maximum 18 µA. This ultra-low quiescent current supports always-on functionality in automotive battery-sensitive applications.
ADM8324WCA46ARJZR7 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:
- 4.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8324WCA46ARJZR7 FAQ
1.How can I place an order for ADM8324WCA46ARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8324WCA46ARJZR7 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 ADM8324WCA46ARJZR7 reliable?
The price and inventory of ADM8324WCA46ARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8324WCA46ARJZR7 is usually 5 days.
3.What payment methods are accepted for ADM8324WCA46ARJZR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8324WCA46ARJZR7 transactions.
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ADM8324WCA46ARJZR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8324WCA46ARJZR7 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 ADM8324WCA46ARJZR7?
For technical support, including ADM8324WCA46ARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8324WCA46ARJZR7 requirements.
6.How does Aetrix verify that ADM8324WCA46ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8324WCA46ARJZR7 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 ADM8324WCA46ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8324WCA46ARJZR7?
All ADM8324WCA46ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8324WCA46ARJZR7, 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 ADM8324WCA46ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8324WCA46ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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