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Analog Devices Inc./Maxim Integrated MAX6394US240D3+T
- Part No.:
- MAX6394US240D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6394US240D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
The MAX6394US240D3+T from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an active-low open-drain RESET signal when voltage falls below 2.40V or upon manual reset assertion. It delivers ±1.0% reset threshold accuracy over –40°C to +125°C, features a factory-programmed 105ms minimum reset timeout period, and operates with only 5µA supply current at 5.5V. It is used in portable battery-powered equipment for reliable power-on and brownout reset control.
For engineers reviewing the MAX6394US240D3+T datasheet, MAX6394US240D3+T pinout, MAX6394US240D3+T application, or MAX6394US240D3+T equivalent, key selection criteria include its 2.4V reset threshold, 105ms timeout, SOT143-4 package, open-drain output compatible with voltages up to 6V, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6394US240D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 2.40V reset threshold, and integrates a temperature-stable monostable timer for the 105ms (min) reset timeout. Its MR input includes internal 63kΩ pullup and 100ns glitch rejection.
It uses an open-drain n-channel MOSFET for RESET output, enabling level-shifting across supplies (e.g., monitoring 3.3V VCC while pulling RESET to 5V), and remains functional down to VCC = 1.0V with guaranteed logic-low output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.40V ±1.0% from –40°C to +125°C - ensures accurate brownout detection across automotive and industrial temperature ranges |
| Reset Timeout Period | 105ms (min), 280ms (max) - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 5µA typical at 5.5V - enables multi-year operation in battery-backed systems |
| Operating Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| Output Type | Active-low open-drain RESET - allows pullup to any voltage ≤6V, enabling cross-supply reset signaling |
| MR Input | Internal 63kΩ pullup, 100ns glitch rejection - eliminates need for external debounce components |
| Package | SOT143-4 (4-pin) - compact 1.3mm × 2.9mm footprint for space-constrained PCBs |
Pinout & Package
SOT143-4 package: 4-pin surface-mount plastic package with exposed pad (not electrically connected), 1.3mm × 2.9mm body size, 0.95mm height, 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for internal circuitry and RESET sink current; must be low-impedance connection |
| RESET (Pin 2) | Active-low open-drain output | Sinks current when asserted; requires external pullup resistor (e.g., 10kΩ) to voltage ≤6V |
| MR (Pin 3) | Manual reset input | Logic-low assertion forces RESET active; internally pulled up to VCC (63kΩ); noise-immune with optional 0.1µF bypass |
| VCC (Pin 4) | Supply and monitor input | Powers device and provides monitored voltage source; threshold derived from internal trimmed divider |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.40V threshold | Eliminates external resistor network and calibration, reducing BOM count and layout area |
| 105ms minimum reset timeout | Ensures μP completes power stabilization and internal state initialization before release |
| Open-drain RESET with 6V tolerance | Enables direct interface to higher-voltage reset buses without level translators |
| 5µA max supply current | Extends battery life in always-on monitoring applications such as smart sensors and wearables |
| AEC-Q100 qualified | Validated for automotive applications including engine control modules and ADAS subsystems |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor with ultra-low-power sleep mode requiring reliable wake-up and initialization after voltage recovery. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET until VCC stabilizes above 2.40V and holds for ≥105ms. Use Value: Prevents corrupted memory writes or firmware execution during marginal battery conditions, improving field reliability. | Use Scenario: Power management in door module ECU where 12V supply may dip during load dump or cold-crank events. IC Role / Device Role / Timing Role: Monitors local 3.3V LDO output and triggers system-wide reset on brownout with precise 2.40V threshold. Use Value: Ensures deterministic restart of CAN communication stack after transient supply collapse. |
| Industrial PLC I/O Submodules | Smart Energy Meters |
Use Scenario: Remote analog input card powered from isolated 5V DC-DC converter subject to line transients. IC Role / Device Role / Timing Role: Provides debounced manual reset via front-panel switch and immunity to <100ns noise spikes on MR. Use Value: Eliminates need for external RC debounce, reducing component count and board area in DIN-rail mounted enclosures. | Use Scenario: Tamper-resistant meter with backup supercapacitor maintaining RTC and secure memory during AC mains failure. IC Role / Device Role / Timing Role: Detects VCC decay below 2.40V and asserts RESET to halt metering firmware before data corruption occurs. Use Value: Guarantees atomic shutdown sequence preserving last valid kWh reading and cryptographic keys. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G125DBVR | Fixed 1.25V threshold; adjustable timeout via external capacitor; 1.5µA quiescent current | Requires external timing component; lower supply current but not pin-compatible | Select when ultra-low power dominates and threshold flexibility is acceptable |
| ADM6315-24ARTZ-RL7 | 2.4V threshold, 200ms timeout, SOT23-4 package; ±2.5% threshold accuracy over temperature | Looser threshold tolerance (±2.5% vs. ±1.0%); same SOT footprint but different pinout (VCC/GND swapped) | Consider for cost-sensitive industrial designs where tighter accuracy is not required |
Compared with TPS3808G125DBVR and ADM6315-24ARTZ-RL7, the MAX6394US240D3+T offers superior temperature stability (±1.0% vs. ±2.5% or untrimmed), factory-set timing (no external cap), and true SOT143-4 pin compatibility - critical for drop-in replacement in automotive and medical designs demanding validated performance.
Availability
MAX6394US240D3+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O submodules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant reset supervision.
Supply support for MAX6394US240D3+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
Maxim Integrated, now part of Analog Devices, designs high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.
The MAX6394US240D3+T belongs to Maxim's high-accuracy μP supervisory product line, engineered specifically for mission-critical power monitoring in automotive and industrial environments where precision reset timing and wide-temperature reliability are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6394US240D3+T?
The MAX6394US240D3+T has a factory-trimmed nominal reset threshold of 2.40V, with guaranteed accuracy of ±0.6% at +25°C and ±1.0% across the full –40°C to +125°C operating range. This value is laser-trimmed during production and documented in Tables 1 and 2 of the official datasheet.
What is the reset timeout period for the MAX6394US240D3+T?
The MAX6394US240D3+T features a factory-programmed reset timeout period of 105ms (minimum), 200ms (typical), and 280ms (maximum). This interval begins when VCC rises above the 2.40V threshold or when the MR input is deasserted, ensuring robust processor initialization.
Can the RESET output of the MAX6394US240D3+T be pulled up to a voltage higher than VCC?
Yes, the MAX6394US240D3+T's open-drain RESET output is rated for voltages up to +6.0V, allowing it to be pulled up to a supply rail higher than VCC (e.g., 5V pullup while monitoring 3.3V VCC). This enables level-shifting functionality without external translators.
Is the MAX6394US240D3+T qualified for automotive applications?
Yes, the MAX6394US240D3+T is AEC-Q100 qualified for Grade 1 (–40°C to +125°C), making it suitable for automotive body electronics, infotainment power management, and ADAS subsystems requiring certified reliability.
Does the MAX6394US240D3+T require external components for basic operation?
No, the MAX6394US240D3+T requires no external resistors or capacitors for core reset supervision. Only an external pullup resistor on RESET (e.g., 10kΩ) is needed. The MR input includes an internal 63kΩ pullup, and timing is fully internal - eliminating calibration and reducing BOM count.
MAX6394US240D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 105ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6394US240D3+T FAQ
1.How can I place an order for MAX6394US240D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6394US240D3+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 MAX6394US240D3+T reliable?
The price and inventory of MAX6394US240D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6394US240D3+T is usually 5 days.
3.What payment methods are accepted for MAX6394US240D3+T?
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4.How is shipping managed for MAX6394US240D3+T?
MAX6394US240D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6394US240D3+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 MAX6394US240D3+T?
For technical support, including MAX6394US240D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6394US240D3+T requirements.
6.How does Aetrix verify that MAX6394US240D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6394US240D3+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 MAX6394US240D3+T meets industry standards.
7.What is the process for return or replacement of MAX6394US240D3+T?
All MAX6394US240D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6394US240D3+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 MAX6394US240D3+T part is unused and in its original packaging.
Return procedure for MAX6394US240D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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