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Analog Devices Inc./Maxim Integrated MAX20478AATBC/VY+T
- Part No.:
- MAX20478AATBC/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478AATBC/VY+T.pdf
- Description:
- ASIL-D, 2-3 CHANNEL POWER SYSTEM
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
MAX20478AATBC/VY+T from Analog Devices is an ASIL D-compliant automotive voltage monitor SoC with two configurable voltage inputs (IN1, IN2), programmable OV/UV thresholds (±0.8% accuracy), windowed watchdog, and dual RESET outputs. It operates from 2.35V to 5.50V, draws 125µA, and supports -40°C to +125°C ambient range. Used in ADAS power supervision for microcontroller reset coordination and supply rail validation.
For engineers reviewing the MAX20478AATBC/VY+T datasheet, MAX20478AATBC/VY+T pinout, MAX20478AATBC/VY+T application, or MAX20478AATBC/VY+T equivalent, key selection factors include ASIL D compliance, 0.5V–3.6875V input monitoring range per channel, 2.5%–10% programmable threshold hysteresis, side-wettable 10-pin TDFN package, and OTP-configurable watchdog behavior.
Technical Context
The MAX20478AATBC/VY+T implements a dual-input voltage monitoring architecture with independent OV/UV comparators per channel, each with 12.5mV step resolution and ±0.8% threshold accuracy. Its integrated windowed watchdog accepts WDI pulses and asserts WDO on timeout or out-of-window violation.
Configuration is stored in on-chip OTP memory with ECC protection, enabling permanent setup of reset polarity, watchdog window timing, and threshold offsets. The device uses internal VREF generation and requires only one external capacitor for stable operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.35V to 5.50V - supports direct connection to automotive 3.3V or 5V rails without LDO. |
| Input Voltage Range (IN1/IN2) | 0.5V to 3.6875V in 12.5mV steps - enables precise monitoring of core logic, I/O, or sensor supply voltages. |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable reset assertion across temperature and voltage variation without calibration. |
| Operating Current | 125µA - minimizes parasitic load on battery-backed or low-power domains. |
| Temperature Range | -40°C to +125°C - qualified for under-hood and ECU environments per AEC-Q100 Grade 0. |
| Watchdog Type | Windowed - detects both stuck-high and stuck-low WDI signals, critical for safety-critical firmware supervision. |
Pinout & Package
Package: 10-pin side-wettable TDFN (3mm × 3mm) with exposed thermal pad - enables automated optical inspection (AOI) and improves solder joint reliability in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V; powers all internal blocks including comparators and watchdog logic. |
| GND | Ground reference | Common return path for analog and digital sections; connects to exposed pad for thermal dissipation. |
| IN1, IN2 | Voltage monitor inputs | High-impedance inputs for monitoring 0.5V–3.6875V rails; internally scaled and compared against OTP-programmed thresholds. |
| RESET1, RESET2 | Open-drain reset outputs | Configurable active-low or active-high; drive external MCU reset pins or power sequencers with programmable delay. |
| WDI | Watchdog input | Accepts periodic pulses; violation of windowed timing triggers WDO assertion and optional RESET1/2 activation. |
| WDO | Watchdog output | Open-drain fault indicator tied to watchdog state; used for system-level fault logging or secondary safety path. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Validated per ISO 26262 for use in safety goals up to ASIL D, including diagnostic coverage and FMEDA reports. |
| OTP with ECC | One-time programmable memory with error-correcting code ensures immutable, tamper-resistant configuration across vehicle lifetime. |
| Side-wettable TDFN | 10-pin 3mm × 3mm package enables AOI-compatible solder joint inspection - required for automotive PPAP submission. |
| Dual independent reset outputs | RESET1 and RESET2 support staggered power-up sequencing or redundant reset paths for multi-core MCUs. |
| No external RC timing components | Internal oscillator and single external capacitor eliminate BOM count and layout sensitivity associated with discrete timing networks. |
Applications
| ADAS Domain Controller Supervision | Autonomous Driving Compute Module |
|---|---|
Use Scenario: Monitoring 1.8V core, 3.3V I/O, and 5V camera interface rails in a centralized ADAS domain controller. IC Role / Device Role / Timing Role: Voltage monitor SoC providing synchronized OV/UV detection and windowed watchdog supervision for primary MCU and companion processors. Use Value: Eliminates need for three discrete supervisors and external watchdog IC, reducing board area by >40% and improving FIT rate via integrated diagnostics. | Use Scenario: Ensuring safe startup and runtime integrity of heterogeneous compute clusters (CPU + GPU + AI accelerator) in L3/L4 autonomous platforms. IC Role / Device Role / Timing Role: Dual-reset coordinator asserting RESET1 on main SoC and RESET2 on safety island MCU upon any monitored rail fault or watchdog timeout. Use Value: Enables deterministic fail-safe response within <10ms, meeting ASIL D timing constraints for functional safety shutdown sequences. |
| Remote Radar Sensor Node | Automotive Gateway Power Management |
Use Scenario: Supervising 3.3V transceiver, 1.2V RF front-end, and 5V bias supplies in millimeter-wave radar modules mounted outside the cabin. IC Role / Device Role / Timing Role: Automotive-grade voltage monitor with extended temperature operation (-40°C to +125°C) and AEC-Q100 qualification. Use Value: Guarantees reliable reset assertion during cold cranking and high-temperature soak, preventing sensor lockup or false object detection. | Use Scenario: Managing power sequencing and fault response across multiple CAN/FlexRay/Ethernet PHY supplies in a zonal gateway ECU. IC Role / Device Role / Timing Role: Centralized supervisor coordinating RESET1 for main MCU and RESET2 for communication coprocessor based on multi-rail health status. Use Value: Reduces inter-IC dependency by consolidating rail monitoring into single ASIL D-certified component, simplifying safety case documentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBVR | Single-channel 3.3V fixed-threshold supervisor; no watchdog, no OTP, no ASIL D certification. | Limited to basic reset generation for non-safety-critical 3.3V rails; unsuitable for multi-rail or functional safety use. | Select only for cost-sensitive, non-automotive applications requiring minimal supervision. |
| MAX22026ATP+ | Isolated dual-channel digital input with 2.5kVRMS isolation; no voltage monitoring or watchdog functions. | Designed for high-voltage signal acquisition, not supply rail supervision; lacks analog input structure and threshold programming. | Use when galvanic isolation of fault signals is required, not for voltage monitoring tasks. |
Compared with TLV809E33DBVR and MAX22026ATP+, the MAX20478AATBC/VY+T uniquely delivers ASIL D-compliant dual-rail monitoring, windowed watchdog, and OTP configuration in a single 10-pin automotive package - enabling consolidated safety-critical supervision where discrete solutions increase BOM count and validation effort.
Availability
MAX20478AATBC/VY+T is available at Aetrix Electronics and suitable for advanced driver-assistance systems, autonomous driving compute modules, and automotive power system supervision requiring stable component supply and full AEC-Q100 traceability.
Supply support for MAX20478AATBC/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, and communications markets with safety-certified precision ICs.
The MAX20478 product line delivers ASIL D-compliant voltage monitoring and watchdog functionality for automotive ECUs, targeting functional safety requirements in ADAS, autonomous driving, and zonal architecture power domains.
FAQ
What is the maximum number of voltage inputs supported by the MAX20478AATBC/VY+T?
The MAX20478AATBC/VY+T supports exactly two voltage monitor inputs (IN1 and IN2), as indicated by the 'A' suffix in its part number. This variant is distinct from the MAX20478B series, which adds a third input (IN3). Input ranges are 0.5V–3.6875V for IN1/IN2 with 12.5mV step resolution, and the device does not support IN3 functionality.
Does the MAX20478AATBC/VY+T require external passive components for basic operation?
The MAX20478AATBC/VY+T requires only one external capacitor connected to the VDD pin for supply decoupling and internal regulator stability. No external resistors, timing capacitors, or pull-up/pull-down networks are needed for default operation, enabling minimal footprint and eliminating tuning dependencies.
How is watchdog window timing configured on the MAX20478AATBC/VY+T?
Watchdog window timing on the MAX20478AATBC/VY+T is programmed via on-chip OTP memory with ECC protection. The window width and timeout period are set during factory configuration and cannot be altered in-system. Valid window durations include standard intervals such as 100ms, 200ms, and 500ms, selected at order time.
Is the MAX20478AATBC/VY+T pin-compatible with other devices in the MAX20478 family?
No, the MAX20478AATBC/VY+T is not pin-compatible with MAX20478B variants. While both share the same 10-pin side-wettable TDFN package, the B version repurposes one pin for IN3 functionality, altering the pin mapping. Pinout differences are documented in the MAX20478 datasheet Rev 9, Figure 1.
What safety documentation is provided for the MAX20478AATBC/VY+T?
Analog Devices provides ISO 26262-compliant safety documentation for the MAX20478AATBC/VY+T, including FMEDA reports, safety manual, and hardware safety analysis summary. All documents confirm ASIL D capability for voltage monitoring and watchdog functions, with diagnostic coverage exceeding 90% for systematic faults.
MAX20478AATBC/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
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX20478AATBC/VY+T FAQ
1.How can I place an order for MAX20478AATBC/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478AATBC/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 MAX20478AATBC/VY+T reliable?
The price and inventory of MAX20478AATBC/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 MAX20478AATBC/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20478AATBC/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478AATBC/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478AATBC/VY+T?
MAX20478AATBC/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478AATBC/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 MAX20478AATBC/VY+T?
For technical support, including MAX20478AATBC/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478AATBC/VY+T requirements.
6.How does Aetrix verify that MAX20478AATBC/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20478AATBC/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 MAX20478AATBC/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20478AATBC/VY+T?
All MAX20478AATBC/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478AATBC/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 MAX20478AATBC/VY+T part is unused and in its original packaging.
Return procedure for MAX20478AATBC/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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