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Analog Devices Inc./Maxim Integrated MAX6381LT44D3+
- Part No.:
- MAX6381LT44D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT44D3+.pdf
- Description:
- POWER MANAGEMENT CIRCUIT, ADJUST
- Quantity:
- Payment:
- Shipping:
Inventory:1,134
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Product details
Overview
The MAX6381LT44D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.38V reset threshold, 140ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors single-supply voltages in portable battery-powered systems and embedded controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381LT44D3+ datasheet, MAX6381LT44D3+ pinout, MAX6381LT44D3+ application, or MAX6381LT44D3+ equivalent, key selection factors include its ±2.5% reset threshold accuracy over -40°C to +125°C, 3µA supply current at 1.8V, SC70-3 package footprint, and guaranteed valid reset assertion down to VCC = 1V.
Technical Context
This device implements a precision bandgap reference and comparator-based reset detection architecture with internal timing capacitor for fixed reset timeout. The reset comparator features 60ppm/°C tempco and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.
The open-drain RESET output requires an external pullup and asserts low when VCC falls below 4.38V (min 4.27V, max 4.48V), remaining asserted for ≥140ms after VCC rises above threshold. No manual reset (MR) or auxiliary RESET IN inputs are present on this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (4.27V–4.48V range); sets precise power-fail detection point for +4.5V logic rails |
| Reset Timeout | 140ms minimum; ensures µP completes full initialization before release |
| Supply Current | 3µA at +1.8V; enables multi-year battery life in always-on monitoring applications |
| Threshold Accuracy | ±2.5% over -40°C to +125°C; eliminates need for external calibration in industrial environments |
| Operating Voltage | 1.0V to 5.5V; guarantees functional reset assertion even during deep brownout |
| Output Type | Active-low open-drain; allows wired-OR configuration with other reset sources |
| Tempco | 60ppm/°C; maintains tight threshold stability across wide temperature range |
Pinout & Package
MAX6381LT44D3+ uses the 3-pin SC70-3 package (package code X3-2), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads. Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET (open-drain active-low).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and serves as reset threshold reference |
| 2 | GND | Analog and digital ground reference; must be low-impedance connection to system ground plane |
| 3 | RESET | Open-drain active-low reset output; requires external pullup resistor to host VCC rail |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | Eliminates external resistor divider and associated tolerance stack-up in space-constrained designs |
| Guaranteed operation down to VCC = 1.0V | Ensures deterministic reset behavior during severe undervoltage conditions where many competitors fail |
| Low 3µA supply current at 1.8V | Reduces quiescent power in battery-backed real-time clocks and IoT endpoint sensors |
| Negative-going transient immunity | Rejects sub-35µs VCC glitches without false resets, improving system robustness in noisy power environments |
| SC70-3 package footprint | Provides smallest available form factor among Maxim's reset supervisors for ultra-dense PCB layouts |
Applications
| Battery-Powered Wearables | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Compact fitness tracker with coin-cell battery and ARM Cortex-M0+ MCU requiring reliable power-on initialization and brownout recovery. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to MCU until regulated 3.3V rail stabilizes above 4.38V threshold. Use Value: 140ms timeout prevents premature firmware execution; 3µA quiescent current extends battery life by >2 years in sleep mode. | Use Scenario: DIN-rail mounted programmable logic controller with dual 24V/5V supplies and extended temperature operation. IC Role / Device Role / Timing Role: Primary reset supervisor monitoring 5V logic rail, asserting open-drain reset to FPGA configuration interface. Use Value: ±2.5% threshold accuracy over -40°C to +125°C ensures consistent reset behavior across operating environment without recalibration. |
| Medical Sensor Nodes | Automotive Body Control Modules |
Use Scenario: Wireless ECG patch with ultra-low-power analog front-end and BLE SoC requiring deterministic wake-up sequence. IC Role / Device Role / Timing Role: Reset generator ensuring SoC remains held in reset until LDO output reaches stable 1.8V with 4.38V detection margin. Use Value: Valid reset assertion down to VCC = 1.0V guarantees safe state retention during rapid battery discharge events. | Use Scenario: Door module with LIN transceiver and 12V-to-5V/3.3V DC-DC converters subject to load-dump transients. IC Role / Device Role / Timing Role: Secondary reset monitor on 5V microcontroller supply, providing glitch-immune reset signaling. Use Value: 35µs negative transient immunity prevents spurious resets during alternator load-dump events per ISO 7637-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 4.63V reset threshold, 240ms timeout, same SC70-3 package | Higher threshold better suited for 5V systems with tighter noise margins; longer timeout accommodates slower power supplies | Select when system requires higher reset voltage margin or extended hold time for complex boot sequences |
| TPS3808G33DBVR | 3.3V reset threshold, adjustable timeout via capacitor, SOT-23-5 package | Lower threshold targets 3.3V logic rails; timeout adjustability adds design flexibility but increases BOM count | Choose when precise 3.3V monitoring is needed or when variable timeout is required for multi-rail sequencing |
Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6381LT44D3+ provides optimal balance of 4.38V threshold accuracy, minimal 140ms timeout, and lowest quiescent current in the smallest footprint-making it ideal for space- and power-constrained 4.5V rail supervision.
Availability
MAX6381LT44D3+ is available at Aetrix Electronics and suitable for battery-powered wearables, industrial PLC I/O modules, medical sensor nodes, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for MAX6381LT44D3+ 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 industrial, automotive, communications, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessors in harsh environments-targeting applications where reliability, small size, and extended temperature operation are critical.
FAQ
What is the exact reset threshold voltage of the MAX6381LT44D3+?
The MAX6381LT44D3+ has a factory-set nominal reset threshold of 4.38V, with guaranteed minimum and maximum values of 4.27V and 4.48V respectively over the full -40°C to +125°C temperature range. This corresponds to the "44" suffix in the part number per Maxim's Reset Threshold table.
Does the MAX6381LT44D3+ include a manual reset input (MR)?
No, the MAX6381LT44D3+ does not feature a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Manual reset capability is only present in MAX6384–MAX6390 variants, as confirmed in the Selector Guide and Pin Description sections.
What package type and dimensions does the MAX6381LT44D3+ use?
The MAX6381LT44D3+ uses the 3-pin SC70-3 package (package code X3-2), with body dimensions of 2.0mm × 2.1mm × 0.95mm and gull-wing lead configuration. This is verified in the Ordering Information table and Package Information section of the datasheet.
How does the reset timeout behavior work on the MAX6381LT44D3+?
The MAX6381LT44D3+ asserts its open-drain RESET output low when VCC falls below 4.38V and holds it low for a minimum of 140ms after VCC rises above the threshold. This D3 timeout value is fixed by internal capacitor and cannot be adjusted externally.
Is the MAX6381LT44D3+ compatible with 1.8V supply rails?
Yes, the MAX6381LT44D3+ operates from 1.0V to 5.5V and consumes only 3µA at 1.8V, making it fully compatible with low-voltage systems. Its reset output remains valid and correctly asserted down to VCC = 1.0V, ensuring reliable operation during deep brownout conditions.
MAX6381LT44D3+ 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:
- 4.38V
- 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)
MAX6381LT44D3+ FAQ
1.How can I place an order for MAX6381LT44D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT44D3+ 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 MAX6381LT44D3+ reliable?
The price and inventory of MAX6381LT44D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT44D3+ is usually 5 days.
3.What payment methods are accepted for MAX6381LT44D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT44D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT44D3+?
MAX6381LT44D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT44D3+ 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 MAX6381LT44D3+?
For technical support, including MAX6381LT44D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT44D3+ requirements.
6.How does Aetrix verify that MAX6381LT44D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6381LT44D3+ 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 MAX6381LT44D3+ meets industry standards.
7.What is the process for return or replacement of MAX6381LT44D3+?
All MAX6381LT44D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT44D3+, 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 MAX6381LT44D3+ part is unused and in its original packaging.
Return procedure for MAX6381LT44D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6381LT44D3+ Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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EM6325CXSP5B-2.9+
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP120T-315I/TT
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