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Analog Devices Inc./Maxim Integrated MAX6381LT46D3+
- Part No.:
- MAX6381LT46D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT46D3+.pdf
- Description:
- POWER MANAGEMENT CIRCUIT, ADJUST
- Quantity:
- Payment:
- Shipping:
Inventory:2,711
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Product details
Overview
The MAX6381LT46D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.63V reset threshold, 140ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors single-supply systems in portable, battery-powered, and industrial embedded applications where precise brownout detection and ultra-low quiescent current (3µA at 1.8V) are critical.
For engineers reviewing the MAX6381LT46D3+ datasheet, MAX6381LT46D3+ pinout, MAX6381LT46D3+ application, or MAX6381LT46D3+ equivalent, key selection considerations include its ±2.5% reset threshold accuracy over –40°C to +125°C, guaranteed valid reset state at VCC ≥ 1V, immunity to negative-going VCC transients, SC70-3/µDFN-6 package options, and compatibility with dual-voltage monitoring architectures via auxiliary reset input variants.
Technical Context
This device implements a precision bandgap-based voltage comparator with internal 1.27V reference for RESET IN monitoring (in related variants), coupled with a temperature-stable reset timer. Its open-drain RESET output requires an external pullup and asserts low when VCC falls below 4.63V (min), remaining asserted for ≥140ms after VCC recovers above threshold.
The MAX6381LT46D3+ uses BiCMOS process technology (647 transistors), supports supply voltages from 1.0V to 5.5V, and guarantees reset assertion during power-down transitions - including transient immunity up to 35µs for 100mV overdrive - while consuming only 3µA at 1.8V and 6µA at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (nominal), ±2.5% accuracy over –40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges. |
| Reset Timeout | 140ms (minimum) - provides sufficient hold time for µP initialization and peripheral stabilization after power recovery. |
| Supply Current | 3µA at VCC = 1.8V - enables multi-year battery life in always-on IoT sensors and portable medical devices. |
| Operating Voltage | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains. |
| Output Type | Active-low open-drain - allows wired-OR configuration, level translation, and flexible pullup selection (e.g., to higher I/O rail). |
| Reset Propagation Delay | 35µs (VCC falling at 10mV/µs) - ensures fast response to rapid supply collapse without false triggering on noise. |
| Tempco | 60ppm/°C - minimizes threshold drift across temperature, critical for stable reset behavior in unregulated environments. |
Pinout & Package
MAX6381LT46D3+ is available in 3-pin SC70 (X3-2) and 6-pin µDFN (L611-1) packages. The SC70-3 variant uses all three pins; the µDFN-6 variant leaves pins 3, 5, and 6 as no-connect (N.C.). Both packages support lead-free assembly and operate from –40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; requires external pullup resistor; sinks current only when asserted (low). |
| 2 | VCC | Main supply input and monitored voltage source; powers internal circuitry and sets primary reset threshold. |
| 3 | GND | Analog/digital ground reference; must be low-impedance connection to ensure accurate threshold comparison. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.63V (±2.5%) eliminates need for external resistor dividers or calibration in fixed-supply systems. |
| Ultra-low supply current | 3µA at 1.8V enables use in energy-harvesting and coin-cell-powered applications without compromising supervision integrity. |
| Valid reset output down to VCC = 1V | Ensures deterministic µP reset assertion even during severe brownout or battery depletion conditions. |
| Negative-going transient immunity | Rejects glitches ≤35µs wide at 100mV overdrive - reduces false resets in electrically noisy industrial environments. |
| Open-drain output architecture | Supports mixed-voltage system interfacing (e.g., 3.3V supervisor driving 5V reset line) and multi-drop reset bus configurations. |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with 2.8V nominal voltage, requiring fail-safe reset during battery sag. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting reset when supply drops below 4.63V, holding reset for ≥140ms to prevent firmware corruption. Use Value: Prevents erratic sensor operation and data loss during end-of-life battery discharge, extending usable device lifetime by ensuring clean restarts. |
Use Scenario: LoRaWAN edge node using 3.3V LDO with intermittent solar charging; experiences frequent brownouts during low-light periods. IC Role / Device Role / Timing Role: Single-supply reset monitor guaranteeing µC reset validity down to 1.0V VCC and rejecting sub-40µs supply noise. Use Value: Eliminates spurious reboots caused by transient dips, improving message delivery reliability and reducing network retries. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted I/O module with 24V-to-3.3V conversion, subject to load-dump transients and cold-crank brownouts. IC Role / Device Role / Timing Role: Supervises post-regulator 3.3V rail; open-drain output interfaces directly to 3.3V µC reset pin with external 10kΩ pullup. Use Value: Provides robust reset timing margin (140ms min) to survive 100ms input dips, meeting IEC 61000-4-29 immunity requirements. |
Use Scenario: Door module powered from vehicle battery (9V–16V); includes local 5V LDO feeding microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Monitors 5V rail with 4.63V threshold to detect LDO failure or upstream supply collapse before CAN communication loss. Use Value: Enables controlled shutdown sequence initiation within 140ms of fault detection, preserving EEPROM state and preventing bus arbitration errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326LTR46D3+ | Same 4.63V threshold and 140ms timeout, but push-pull active-low output (no external pullup required); higher ICC (10µA typ at 1.8V). | Preferred where board space prohibits pullup resistor or where faster rise time is needed without RC delay. | Select MAX6326LTR46D3+ if push-pull drive simplifies layout and higher supply current is acceptable. |
| TPS3808G33DBVR | 3.3V reset threshold (not 4.63V); 200ms timeout; 1.8V–6.5V operation; 1.1µA ICC at 3.3V; SOT-23-5 package. | Suitable for 3.3V-only systems needing lower ICC, but not drop-in for 4.63V monitoring or SC70 footprint. | Choose TPS3808G33DBVR only when redesigning for 3.3V rail supervision and ultra-low power is paramount. |
Compared with MAX6326LTR46D3+, the MAX6381LT46D3+ saves board area by eliminating the pullup resistor but requires careful pullup selection for rise time and bus loading; versus TPS3808G33DBVR, it offers exact 4.63V threshold match and SC70-3 compatibility but consumes more current - making it optimal for legacy 4.6V rail designs with strict footprint constraints.
Availability
MAX6381LT46D3+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for MAX6381LT46D3+ 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 precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications, with emphasis on power efficiency and reliability.
The MAX6381–MAX6390 family delivers low-power, high-accuracy µP reset supervision for space-constrained and battery-sensitive systems - engineered specifically for robust operation in harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of the MAX6381LT46D3+?
The MAX6381LT46D3+ has a factory-set nominal reset threshold of 4.63V, with guaranteed limits of 4.51V (min) and 4.74V (max) over –40°C to +125°C, and ±2.5% accuracy across temperature. This value is laser-trimmed during production and does not require external components to set.
Does the MAX6381LT46D3+ support manual reset functionality?
No, the MAX6381LT46D3+ does not include a manual reset (MR) input. Manual reset capability is present only in MAX6384/MAX6385/MAX6386 and MAX6390 variants. The MAX6381LT46D3+ is a dedicated single-supply supervisor with RESET and RESET IN pins omitted in this specific configuration.
What package options are available for the MAX6381LT46D3+?
The MAX6381LT46D3+ is offered in two RoHS-compliant, lead-free packages: 3-pin SC70 (package code X3-2) and 6-pin µDFN (package code L611-1). In the µDFN variant, pins 3, 5, and 6 are no-connect (N.C.), matching the 3-pin functional interface.
Can the MAX6381LT46D3+ monitor a second voltage rail?
No, the MAX6381LT46D3+ does not support auxiliary voltage monitoring. The RESET IN pin is only available on MAX6387/MAX6388/MAX6389 variants. The MAX6381LT46D3+ supervises only the VCC supply and lacks internal circuitry for secondary threshold comparison.
What is the minimum operating voltage for valid reset assertion in the MAX6381LT46D3+?
The MAX6381LT46D3+ guarantees correct reset output logic state down to VCC = 1.0V. Below this voltage, the internal comparator and timer may become nonfunctional, but the device remains latched in reset until VCC rises above 1.0V and then crosses the 4.63V threshold.
MAX6381LT46D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX6381LT46D3+ FAQ
1.How can I place an order for MAX6381LT46D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT46D3+ 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 MAX6381LT46D3+ reliable?
The price and inventory of MAX6381LT46D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT46D3+ is usually 5 days.
3.What payment methods are accepted for MAX6381LT46D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT46D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT46D3+?
MAX6381LT46D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT46D3+ 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 MAX6381LT46D3+?
For technical support, including MAX6381LT46D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT46D3+ requirements.
6.How does Aetrix verify that MAX6381LT46D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6381LT46D3+ 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 MAX6381LT46D3+ meets industry standards.
7.What is the process for return or replacement of MAX6381LT46D3+?
All MAX6381LT46D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT46D3+, 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 MAX6381LT46D3+ part is unused and in its original packaging.
Return procedure for MAX6381LT46D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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