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Analog Devices Inc. ADM8316WBX46ARJZR7
- Part No.:
- ADM8316WBX46ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8316WBX46ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:354
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Product details
Overview
ADM8316WBX46ARJZR7 from Analog Devices is a supervisory circuit with watchdog timer and manual reset, designed for microprocessor supply voltage monitoring in automotive and industrial systems. It features a 4.63 V reset threshold, 20 ms minimum reset timeout, 102 ms typical watchdog timeout, −40°C to +125°C operating range, and 5-lead SOT-23 package. It asserts an active-low push-pull reset output upon undervoltage, watchdog timeout, or manual reset activation.
For engineers reviewing the ADM8316WBX46ARJZR7 datasheet, ADM8316WBX46ARJZR7 pinout, ADM8316WBX46ARJZR7 application, or ADM8316WBX46ARJZR7 equivalent, key selection considerations include its automotive qualification, precise 4.63 V reset threshold tolerance (±1.5% over temperature), 10 µA supply current at 3.6 V, push-pull RESET output drive capability up to 1.2 mA at 2.7 V, and integrated 75 kΩ MR pull-up resistor.
Technical Context
The ADM8316WBX46ARJZR7 implements a precision bandgap-based voltage monitor with factory-trimmed 4.63 V reset threshold and 2.5 mV hysteresis. Its watchdog timer clears on any WDI logic transition (≥50 ns pulse width) and times out after 102 ms (typical), triggering reset if microprocessor code stalls.
It integrates a glitch-filtered manual reset input (MR) with 100 ns noise rejection and 350 ns propagation delay, and delivers a push-pull RESET output guaranteed valid down to VCC = 0.9 V. The device operates across the full automotive temperature range and consumes only 10–18 µA at 3.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±1.5% over −40°C to +125°C - ensures reliable brownout detection for 5 V rail monitoring with margin against ripple and drift. |
| Reset Timeout | 20 ms minimum - provides sufficient hold time for microprocessor power stabilization before release from reset. |
| Watchdog Timeout | 102 ms typical - balances responsiveness to firmware lockup with tolerance for brief execution delays. |
| Supply Current | 10 µA at 3.6 V - enables integration into always-on automotive subsystems without significant battery drain. |
| Operating Temp | −40°C to +125°C - qualified for under-hood and infotainment applications per AEC-Q100 requirements. |
| Output Type | Active-low push-pull RESET - drives low without external pull-up, supports direct connection to MCU reset pin. |
| MR Input | Internal 75 kΩ pull-up - eliminates need for external resistor; compatible with momentary switch to GND. |
Pinout & Package
ADM8316WBX46ARJZR7 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 and standard 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives low during undervoltage, watchdog timeout, or MR assertion; sinks ≥1.2 mA at 2.7 V; valid down to VCC = 0.9 V. |
| 2 - GND | Ground reference | Primary return path for internal circuitry and RESET output; must be connected to system ground plane. |
| 3 - MR | Manual reset input (active low) | Accepts external push-button; internally pulled up to VCC via 75 kΩ; rejects <100 ns glitches; 350 ns delay to RESET assertion. |
| 4 - WDI | Watchdog input | Clears watchdog timer on rising/falling edge; requires ≥50 ns pulse; floating disables watchdog function. |
| 5 - VCC | Supply voltage input | Monitored rail (2.5–5.5 V); powers internal circuitry; reset asserted when below 4.63 V ±1.5%. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | W-grade part qualified per AEC-Q100 for under-hood and infotainment use with controlled manufacturing and reliability reporting. |
| Precision reset threshold | Factory-trimmed 4.63 V with ±1.5% tolerance over full temperature range - eliminates need for external resistor divider calibration. |
| Low-power supervision | 10 µA supply current at 3.6 V - extends battery life in always-on vehicle modules such as telematics and gateway ECUs. |
| Integrated MR pull-up | 75 kΩ internal resistor - reduces BOM count and PCB area; enables direct switch-to-ground interface without external components. |
| Glitch-immune inputs | 100 ns MR glitch rejection and WDI edge-triggered watchdog - prevents false resets from EMI or switch bounce. |
Applications
| Automotive Infotainment | Engine Control Unit (ECU) |
|---|---|
|
Use Scenario: Reset management for head unit SoC during cold crank or load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to SoC upon VCC dip below 4.63 V or watchdog timeout. Use Value: Prevents corrupted boot sequences by holding SoC in reset until 5 V rail stabilizes for ≥20 ms post-recovery. |
Use Scenario: Ensuring deterministic restart of engine control MCU after brownout caused by alternator failure. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor providing fail-safe reset signal with 102 ms timeout. Use Value: Guarantees MCU reset within 102 ms if firmware hangs during critical sensor polling loop. |
| Industrial PLC Controller | Telematics Control Unit (TCU) |
|
Use Scenario: Power sequencing and runtime integrity check for programmable logic controller CPU module. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 5 V supply and validates software execution via WDI strobing. Use Value: Enables recovery from transient faults without operator intervention, meeting IEC 61508 functional safety prerequisites. |
Use Scenario: Always-on cellular modem supervision in vehicle tracking systems with battery backup. IC Role / Device Role / Timing Role: Low-current (10 µA) supervisor maintaining reset state during sleep mode and detecting wake-up failures. Use Value: Extends backup battery life while ensuring modem reboots reliably after firmware crash or network timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8320WBX46ARJZR7 | Same 4.63 V threshold and 20 ms reset timeout, but open-drain RESET output requiring external pull-up. | Suitable where level-shifting or wired-OR reset bus is needed; not drop-in due to output topology change. | Select only if system design already uses open-drain reset architecture or requires reset line sharing. |
| MAX6326XR46D3+T | 4.63 V threshold, 20 ms reset timeout, but no watchdog timer and no MR input; 3-pin SOT-23 package. | Limited to basic voltage monitoring; lacks runtime code integrity checking and manual reset capability. | Choose only for cost-sensitive, non-safety-critical applications where watchdog and MR functions are omitted. |
Compared with ADM8320WBX46ARJZR7 and MAX6326XR46D3+T, the ADM8316WBX46ARJZR7 uniquely combines automotive qualification, push-pull RESET, integrated MR pull-up, and 102 ms watchdog - enabling single-chip supervision without layout or firmware changes required for basic reset ICs.
Availability
ADM8316WBX46ARJZR7 is available at Aetrix Electronics and suitable for automotive infotainment, engine control units, and industrial PLC controllers requiring stable component supply with long-term lifecycle assurance.
Supply support for ADM8316WBX46ARJZR7 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 ADM8316 series belongs to Analog Devices' automotive-grade supervisory IC product line, engineered specifically to ensure robust power-on reset, brownout protection, and runtime code integrity in harsh automotive environments.
FAQ
What is the exact reset threshold voltage of ADM8316WBX46ARJZR7 and how does it vary with temperature?
The ADM8316WBX46ARJZR7 has a nominal reset threshold of 4.63 V at 25°C, with guaranteed tolerance of ±1.5% across −40°C to +125°C. Its temperature coefficient is 20 ppm/°C, resulting in ≤14 mV total drift over the full range. This precision eliminates need for external calibration and ensures reliable detection of 5 V rail brownouts in automotive applications.
Does ADM8316WBX46ARJZR7 require external components for manual reset functionality?
No, ADM8316WBX46ARJZR7 includes a built-in 75 kΩ pull-up resistor on the MR pin, allowing direct connection of a momentary switch between MR and GND. No external resistor is needed. The device also provides 100 ns glitch rejection and 350 ns MR-to-RESET propagation delay, simplifying front-panel reset implementation.
What watchdog timeout options are supported by ADM8316WBX46ARJZR7?
The ADM8316WBX46ARJZR7 is configured with watchdog timeout option X, delivering a typical timeout of 102 ms (min 72 ms, max 132 ms). This value is factory-set and cannot be adjusted externally. The watchdog clears on any WDI logic transition (≥50 ns), making it suitable for monitoring firmware loops with predictable execution windows.
Is ADM8316WBX46ARJZR7 pin-compatible with other members of the ADM8316/ADM8322 family?
No - ADM8316WBX46ARJZR7 is not pin-compatible with ADM8320/ADM8321/ADM8322 variants due to differing RESET output topologies (push-pull vs. open-drain) and pin assignments (e.g., ADM8320 uses Pin 1 for open-drain RESET, while ADM8316 uses Pin 1 for push-pull RESET). Board redesign is required for substitution.
What is the supply current consumption of ADM8316WBX46ARJZR7 at 3.6 V and 25°C?
At 3.6 V and 25°C, ADM8316WBX46ARJZR7 draws 10–18 µA (typical 10 µA) with WDI floating. This ultra-low quiescent current supports integration into battery-backed automotive modules such as TCUs and ADAS sensors where standby power budget is tightly constrained.
ADM8316WBX46ARJZR7 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:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8316WBX46ARJZR7 FAQ
1.How can I place an order for ADM8316WBX46ARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8316WBX46ARJZR7 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 ADM8316WBX46ARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8316WBX46ARJZR7 is usually 5 days.
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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 ADM8316WBX46ARJZR7?
For technical support, including ADM8316WBX46ARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8316WBX46ARJZR7 requirements.
6.How does Aetrix verify that ADM8316WBX46ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8316WBX46ARJZR7 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 ADM8316WBX46ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8316WBX46ARJZR7?
All ADM8316WBX46ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8316WBX46ARJZR7, 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 ADM8316WBX46ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8316WBX46ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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