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Analog Devices Inc. ADM8324WCA29ARJZR7
- Part No.:
- ADM8324WCA29ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8324WCA29ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
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Product details
Overview
ADM8324WCA29ARJZR7 from Analog Devices is an automotive-qualified supervisory circuit with windowed watchdog timer, manual reset input, and open-drain active-low RESET output. It monitors VCC supply voltage (reset threshold = 2.93 V), provides 140 ms minimum reset timeout, and supports fast watchdog timeout of 1.5 ms and slow timeout of 10 ms - used in engine control units, ADAS domain controllers, and infotainment power management.
For engineers reviewing the ADM8324WCA29ARJZR7 datasheet, ADM8324WCA29ARJZR7 pinout, ADM8324WCA29ARJZR7 application, or ADM8324WCA29ARJZR7 equivalent, this page delivers verified functional identity, exact reset/watchdog timing values, SOT-23 pin mapping, automotive-grade thermal performance (−40°C to +125°C), and validated alternative options for microprocessor supervision in safety-critical embedded systems.
Technical Context
The ADM8324WCA29ARJZR7 implements a dual-fault windowed watchdog architecture: it triggers reset on either fast errors (WDI pulses too close, <1.5 ms) or slow errors (no WDI pulse >10 ms), ensuring robust detection of both runaway and stalled code execution. Its internal voltage divider sets a factory-trimmed 2.93 V reset threshold with ±1.5% tolerance over temperature.
This device uses an open-drain RESET output requiring external pull-up, supports manual reset via MR pin with integrated 75 kΩ pull-up and 100 ns glitch rejection, and consumes only 10 µA typical supply current at 5.5 V - enabling use in always-on automotive subsystems with strict quiescent power budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 0.9 V to 5.5 V - guarantees valid RESET assertion down to 0.9 V, supporting brownout detection during deep sleep wake-up. |
| Reset Threshold (VTH) | 2.93 V (±1.5% over −40°C to +125°C) - factory-trimmed for precise 3.3 V rail supervision in automotive ECUs. |
| Reset Timeout | 140 ms minimum - ensures stable microprocessor initialization after power-up or recovery from brownout. |
| Watchdog Fast Timeout | 1.5 ms (min) - detects rapid software hangs, e.g., lockup in real-time interrupt service routines. |
| Watchdog Slow Timeout | 10 ms (min) - identifies prolonged code stalls, such as infinite loops or missed task scheduling. |
| 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 - qualified per AEC-Q100 for under-hood and transmission control applications. |
Pinout & Package
ADM8324WCA29ARJZR7 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 | Requires external pull-up; sinks ≥1.2 mA at VCC ≥2.7 V; asserts during VCC undervoltage, MR low, or watchdog fault. |
| 2 - GND | Ground reference | Primary return path for internal comparators, watchdog logic, and RESET driver; must be low-impedance. |
| 3 - MR | Manual reset input | Active-low with 75 kΩ internal pull-up; 1 µs minimum pulse width; rejects 100 ns glitches; debounced on-chip. |
| 4 - WDI | Windowed watchdog input | Accepts 200 ns minimum pulses; cleared on each falling edge; ignored during RESET assertion. |
| 5 - VCC | Monitored supply voltage input | Input to internal voltage divider and bandgap reference; powers all circuitry; valid operation from 0.9 V. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Dual-threshold detection (fast error ≤1.5 ms, slow error ≥10 ms) prevents false resets from transient noise while catching both stuck and sluggish firmware. |
| Factory-trimmed reset threshold | 2.93 V with ±1.5% variation across −40°C to +125°C - eliminates need for external resistor dividers in 3.3 V system supervision. |
| Automotive qualification | AEC-Q100 Grade 0 compliant (−40°C to +125°C), with controlled manufacturing and reliability reporting - suitable for ASIL-B–capable power monitoring. |
| Low-quiescent-current design | 10 µA typical ICC at 5.5 V - enables direct connection to always-on battery rails in vehicle body control modules. |
| Integrated MR debounce & pull-up | On-chip 75 kΩ MR pull-up and 100 ns glitch filter - removes need for external RC network when using push-button reset. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) Domain Controller |
|---|---|
Use Scenario: Monitors 3.3 V microcontroller supply during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during VCC dip below 2.93 V and detecting firmware hang via WDI window violation. Use Value: Prevents ECU from executing corrupted code after voltage sag, ensuring deterministic restart within 140 ms. |
Use Scenario: Ensures safe boot and runtime integrity of radar fusion processor in autonomous driving stack. IC Role / Device Role / Timing Role: Windowed watchdog enforces strict timing boundaries on sensor data processing threads; MR enables diagnostic forced reset. Use Value: Detects both short-duration lockups (<1.5 ms) and long stalls (>10 ms), meeting ISO 26262 functional safety timing requirements. |
| Infotainment Head Unit Power Management | Electric Power Steering (EPS) Module |
Use Scenario: Manages graceful shutdown and wake-up sequencing for SoC-based multimedia systems. IC Role / Device Role / Timing Role: Generates 140 ms reset pulse on VCC rise to hold processor in reset until power stabilizes; WDI confirms OS scheduler liveness. Use Value: Eliminates boot failures caused by premature clock enable or memory initialization before rail settling. |
Use Scenario: Supervises safety-critical MCU in torque assist control loop during high-vibration road conditions. IC Role / Device Role / Timing Role: Open-drain RESET interfaces directly with EPS MCU's dedicated reset pin; MR allows service-mode recalibration reset. Use Value: Guarantees reset validity down to 0.9 V VCC and operates reliably at 125°C ambient - critical for under-hood deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12QDBVRQ1 | Fixed 1.2 V reset threshold; no windowed watchdog (single timeout); push-pull RESET output. | Limited to low-voltage logic rails; unsuitable for 3.3 V microprocessor supervision requiring windowed fault detection. | Select only if system uses 1.2 V core supply and does not require dual-fault watchdog coverage. |
| MAX6373KSA+T | 2.93 V reset threshold; 140 ms reset timeout; but uses standard (non-windowed) watchdog with single timeout (1.6 s). | Cannot distinguish between fast and slow firmware faults; higher risk of false positives during transient interrupts. | Choose only for cost-sensitive non-safety applications where windowed watchdog is not required. |
Compared with TPS3808G12QDBVRQ1 and MAX6373KSA+T, ADM8324WCA29ARJZR7 uniquely delivers automotive-grade 2.93 V supervision with true windowed watchdog discrimination - essential for ASIL-B–aligned microprocessor supervision where fault classification impacts safety mechanism design.
Availability
ADM8324WCA29ARJZR7 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and electric power steering modules requiring stable component supply with full automotive qualification and traceable sourcing.
Supply support for ADM8324WCA29ARJZR7 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, serving precision instrumentation, industrial automation, and automotive markets since 1965.
The ADM8324WCA29ARJZR7 belongs to Analog Devices' automotive supervisory IC product line, engineered specifically for robust power monitoring and firmware integrity verification in safety-critical vehicle subsystems operating across extended temperature ranges.
FAQ
What is the exact reset threshold voltage of ADM8324WCA29ARJZR7 and how stable is it over temperature?
The ADM8324WCA29ARJZR7 has a factory-trimmed nominal reset threshold of 2.93 V, with guaranteed tolerance of ±1.5% across the full −40°C to +125°C operating range. This stability is achieved via on-chip trimmed resistive divider and bandgap reference, eliminating drift-related false resets in under-hood automotive environments.
Does ADM8324WCA29ARJZR7 support both fast and slow watchdog timeout detection, and what are the values?
Yes, ADM8324WCA29ARJZR7 implements true windowed watchdog functionality: fast timeout is 1.5 ms (minimum), and slow timeout is 10 ms (minimum). These values are fixed for the "A" watchdog option encoded in the part number and are measured from the last WDI falling edge - enabling unambiguous detection of both rapid lockups and prolonged stalls.
What type of RESET output does ADM8324WCA29ARJZR7 have, and what external components are required?
ADM8324WCA29ARJZR7 features an active-low open-drain RESET output (Pin 1), requiring an external pull-up resistor to a logic-compatible voltage rail (≤VCC). A 10 kΩ resistor is typically sufficient to meet microprocessor input voltage thresholds while limiting sink current to ≤1.2 mA during assertion.
Is ADM8324WCA29ARJZR7 qualified for automotive applications, and what standards does it meet?
Yes, ADM8324WCA29ARJZR7 is explicitly qualified for automotive use: the "W" suffix denotes AEC-Q100 Grade 0 compliance (−40°C to +125°C), with controlled manufacturing, stress testing, and reliability reporting aligned to automotive quality requirements - making it suitable for engine, chassis, and ADAS applications.
What is the minimum reset timeout period specified for ADM8324WCA29ARJZR7, and why is this value important?
The ADM8324WCA29ARJZR7 has a minimum reset timeout of 140 ms, corresponding to the "C" reset timeout option in its ordering code. This duration ensures the microprocessor remains held in reset long enough for power rails, clocks, and internal regulators to fully stabilize after power-up or brownout recovery - preventing erratic boot behavior.
ADM8324WCA29ARJZR7 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8324WCA29ARJZR7 FAQ
1.How can I place an order for ADM8324WCA29ARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8324WCA29ARJZR7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of ADM8324WCA29ARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8324WCA29ARJZR7 is usually 5 days.
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Once your ADM8324WCA29ARJZR7 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 ADM8324WCA29ARJZR7?
For technical support, including ADM8324WCA29ARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8324WCA29ARJZR7 requirements.
6.How does Aetrix verify that ADM8324WCA29ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8324WCA29ARJZR7 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 ADM8324WCA29ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8324WCA29ARJZR7?
All ADM8324WCA29ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8324WCA29ARJZR7, 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 ADM8324WCA29ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8324WCA29ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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