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Analog Devices Inc./Maxim Integrated MAX20478BATBE/VY+T
- Part No.:
- MAX20478BATBE/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478BATBE/VY+T.pdf
- Description:
- MAX20478BATBE/VY+T
- Quantity:
- Payment:
- Shipping:
Inventory:4,353
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Product details
Overview
The MAX20478BATBE/VY+T from Analog Devices is a three-input ASIL D-compliant automotive voltage monitor IC with integrated windowed watchdog, programmable OV/UV thresholds (±0.8% accuracy), 2.35V–5.50V supply range, and operation from –40°C to +125°C - used for real-time power-rail supervision in ADAS domain controllers.
For engineers reviewing the MAX20478BATBE/VY+T datasheet, MAX20478BATBE/VY+T pinout, MAX20478BATBE/VY+T application, or MAX20478BATBE/VY+T equivalent, key selection criteria include ASIL D compliance, triple-voltage monitoring capability, OTP-configurable reset timing, and AEC-Q100 Grade 0 qualification for safety-critical automotive subsystems.
Technical Context
The MAX20478BATBE/VY+T implements a fully integrated SoC architecture combining three independent voltage comparators with digitally programmable OV/UV thresholds, a windowed watchdog timer with WDI input and WDDIS control, and dual open-drain RESET outputs. All configuration is stored in OTP memory with ECC protection.
It supports two distinct monitoring modes: Inputs IN1 and IN2 monitor 0.5V–3.6875V in 12.5mV steps; Input IN3 monitors 0.5V–5.6V in 20mV steps. Threshold hysteresis is fixed at 0.5%, and UV/OV trip points are selectable from 90%–97.5% (UV) and 102.5%–110% (OV) of nominal rail voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.35V to 5.50V - enables direct connection to 3.3V or 5V automotive power domains without external regulators. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and ECU-internal placement per AEC-Q100 Grade 0. |
| Voltage Monitoring Inputs | Three independent inputs: IN1/IN2 (0.5V–3.6875V, 12.5mV step); IN3 (0.5V–5.6V, 20mV step) - supports multi-rail supervision of MCU core, I/O, and sensor supplies. |
| Threshold Accuracy | ±0.8% - ensures precise detection of rail deviations critical for ISO 26262 ASIL D fault containment. |
| Watchdog Type | Windowed watchdog with WDI input and WDDIS disable - prevents false resets during known safe software windows and supports fail-safe timeout recovery. |
| Reset Outputs | Two open-drain RESET pins (RESET1, RESET2) - configurable for independent reset assertion per monitored rail or cascaded sequencing. |
| Quiescent Current | 125µA - minimizes standby power draw in always-on vehicle domains such as telematics or gateway ECUs. |
Pinout & Package
Package: 10-pin side-wettable TDFN (3mm × 3mm) with exposed thermal pad - supports automated optical inspection (AOI) and high-reliability solder joint formation for automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V; powers internal regulators, comparators, and watchdog logic. |
| GND | Ground reference | Primary analog/digital return path; connects to exposed pad for thermal and EMI performance. |
| IN1, IN2, IN3 | Monitor input terminals | High-impedance analog inputs for sensing system rails; IN1/IN2 support lower-voltage rails (e.g., 1.2V, 1.8V), IN3 supports higher rails (e.g., 5V, 3.3V). |
| RESET1, RESET2 | Open-drain reset outputs | Assert low on threshold violation; require external pull-up; configurable for independent or coordinated reset behavior. |
| WDI | Watchdog input | Edge-triggered input to refresh windowed watchdog timer; missing edges trigger reset assertion. |
| WDDIS | Watchdog disable control | Active-low digital input to temporarily suspend watchdog function during known safe states (e.g., firmware update). |
| REF | Internal reference output | Provides stable 1.25V reference for external calibration or auxiliary circuitry; buffered and low-noise. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Validated fault coverage and diagnostic coverage per ISO 26262-5 Annex D, enabling use in safety goals up to ASIL D without additional hardware redundancy. |
| OTP configuration with ECC | One-time programmable memory stores all settings (thresholds, reset timing, watchdog window) with error-correcting code - eliminates need for external EEPROM or configuration pins. |
| Side-wettable TDFN package | 10-pin 3mm × 3mm TDFN with gull-wing side leads - enables automated AOI of solder joints, improving field reliability in automotive production. |
| Triple independent monitoring | Three dedicated analog inputs with separate OV/UV thresholds - allows simultaneous supervision of processor core, I/O, and peripheral rails without multiplexing or timing overhead. |
| Windowed watchdog | Requires periodic WDI pulses within defined upper/lower time bounds - detects both stuck-at-high and stuck-at-low software faults unlike standard timeout watchdogs. |
Applications
| ADAS Domain Controller Power Supervision | Autonomous Driving Compute Module |
|---|---|
Use Scenario: Continuous monitoring of 1.2V core, 1.8V I/O, and 5V sensor interface rails in NVIDIA Orin-based ADAS ECUs. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor ensuring deterministic reset initiation upon rail deviation or software hang. Use Value: Enables ASIL D-compliant power integrity verification without adding discrete comparators or external watchdog ICs - reducing BOM count by ≥4 components. | Use Scenario: Fault-tolerant supervision of dual-core MCU supply rails and FPGA configuration voltage in L3 autonomous driving platforms. IC Role / Device Role / Timing Role: Triple-input monitor with independent RESET1/RESET2 outputs provides selective reset isolation between compute and safety islands. Use Value: Supports split-reset architecture required for ISO 26262 partitioning - eliminating single-point failure risk across functional safety domains. |
| Remote Radar Sensor Module | Automotive Gateway ECU |
Use Scenario: Compact 3.3V/5V/12V rail monitoring in millimeter-wave radar modules mounted behind bumpers or grilles. IC Role / Device Role / Timing Role: High-accuracy voltage supervisor with wide temperature tolerance (–40°C to +125°C) and low quiescent current (125µA). Use Value: Maintains reliable supervision under extreme ambient conditions while minimizing parasitic drain on always-on battery circuits. | Use Scenario: Centralized power management and watchdog coordination across CAN, Ethernet, and LIN subsystems in Zonal Gateway ECUs. IC Role / Device Role / Timing Role: System-level voltage monitor interfacing with microcontroller via WDI/WDDIS and dual RESET outputs for hierarchical reset propagation. Use Value: Reduces gateways' external supervision IC count by consolidating three rail monitors + watchdog into one AEC-Q100-qualified device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20477BATBE/VY+T | Two-input variant (IN1/IN2 only); no IN3; identical watchdog, OTP, and package. | Lacks third input for high-voltage rail monitoring (e.g., 5V sensor supplies); suitable for dual-rail MCU-only systems. | Select when only two rails require supervision and cost optimization is prioritized over flexibility. |
| TLV809E33DBVR | Single-channel 3.3V supervisor with fixed threshold; no watchdog, no OTP, no multi-input capability. | Requires multiple units and external logic to emulate triple monitoring; not ASIL D qualified. | Use only for non-safety-critical, low-complexity applications where functional safety certification is not required. |
Compared with MAX20478BATBE/VY+T, the MAX20477BATBE/VY+T offers identical safety and integration but omits IN3 - making it suitable for cost-sensitive dual-rail designs - while TLV809E33DBVR lacks ASIL D compliance, programmability, and multi-input capability, limiting it to basic reset generation in non-automotive contexts.
Availability
MAX20478BATBE/VY+T is available at Aetrix Electronics and suitable for advanced driver-assistance systems, autonomous driving compute modules, and automotive gateway ECUs requiring stable component supply and full ASIL D traceability.
Supply support for MAX20478BATBE/VY+T 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20478 belongs to Analog Devices' automotive power supervision product line, engineered specifically for ISO 26262-compliant voltage monitoring and watchdog functionality in safety-critical vehicle ECUs.
FAQ
What is the ASIL D compliance status of the MAX20478BATBE/VY+T?
The MAX20478BATBE/VY+T is certified ASIL D compliant per ISO 26262-5 Annex D, with documented fault coverage metrics, diagnostic coverage analysis, and safety manual support. This compliance is integral to the MAX20478BATBE/VY+T design and validated across its full operating range (–40°C to +125°C), enabling direct use in ASIL D safety goals without external redundancy.
How many voltage inputs does the MAX20478BATBE/VY+T support, and what are their ranges?
The MAX20478BATBE/VY+T supports three independent voltage inputs: IN1 and IN2 monitor 0.5V–3.6875V in 12.5mV steps, while IN3 monitors 0.5V–5.6V in 20mV steps. This triple-input capability is fixed for the MAX20478BATBE/VY+T variant and enables simultaneous supervision of core, I/O, and high-voltage sensor rails in automotive ECUs.
Does the MAX20478BATBE/VY+T include a watchdog timer, and what type is it?
Yes, the MAX20478BATBE/VY+T integrates a windowed watchdog timer with WDI input and WDDIS disable control. Unlike simple timeout watchdogs, this windowed architecture requires pulses within both upper and lower time bounds - detecting both software lockup and runaway execution. The watchdog behavior is configured via OTP and is part of the MAX20478BATBE/VY+T's ASIL D safety mechanism.
What package type and pin count does the MAX20478BATBE/VY+T use?
The MAX20478BATBE/VY+T uses a 10-pin side-wettable TDFN package measuring 3mm × 3mm with an exposed thermal pad. This package supports automated optical inspection (AOI) of solder joints and is qualified to AEC-Q100 Grade 0, making it suitable for high-reliability automotive applications where solder joint integrity is critical.
Can the MAX20478BATBE/VY+T replace discrete voltage supervisors in existing designs?
Yes, the MAX20478BATBE/VY+T replaces up to three discrete voltage supervisors plus a standalone watchdog IC, reducing board space and component count. Its triple-input architecture, OTP configuration, and dual RESET outputs allow consolidation of rail supervision and fault detection functions - verified in production ADAS and gateway ECU designs using the MAX20478BATBE/VY+T.
MAX20478BATBE/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX20478BATBE/VY+T FAQ
1.How can I place an order for MAX20478BATBE/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478BATBE/VY+T 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 MAX20478BATBE/VY+T reliable?
The price and inventory of MAX20478BATBE/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20478BATBE/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20478BATBE/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478BATBE/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478BATBE/VY+T?
MAX20478BATBE/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478BATBE/VY+T 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 MAX20478BATBE/VY+T?
For technical support, including MAX20478BATBE/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478BATBE/VY+T requirements.
6.How does Aetrix verify that MAX20478BATBE/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20478BATBE/VY+T 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 MAX20478BATBE/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20478BATBE/VY+T?
All MAX20478BATBE/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478BATBE/VY+T, 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 MAX20478BATBE/VY+T part is unused and in its original packaging.
Return procedure for MAX20478BATBE/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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