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Analog Devices Inc./Maxim Integrated MAX6381LT26D2+
- Part No.:
- MAX6381LT26D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT26D2+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,467
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Product details
Overview
MAX6381LT26D2+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.63V reset threshold, 20ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors single supply voltage in battery-powered systems and embedded controllers, asserting reset during brownout or power-up sequencing to prevent erroneous code execution.
For engineers reviewing the MAX6381LT26D2+ datasheet, MAX6381LT26D2+ pinout, MAX6381LT26D2+ application, or MAX6381LT26D2+ equivalent, key selection criteria include guaranteed reset validity at low VCC (1.0V), ±2.5% threshold accuracy over -40°C to +125°C, 3μA supply current at 1.8V, and compatibility with dual-voltage monitoring architectures via external resistor dividers.
Technical Context
The MAX6381LT26D2+ implements a precision bandgap-based reset comparator with 60ppm/°C tempco and negative-going VCC transient immunity up to 35µs at 100mV overdrive. Its internal timer guarantees minimum 20ms reset assertion after VCC rises above 2.63V, with reset output state valid across full VCC range (1.0V–5.5V).
This device belongs to the MAX6381–MAX6390 family of single-supply supervisors featuring three reset output configurations; MAX6381LT26D2+ specifically uses open-drain active-low output requiring an external pullup resistor, and excludes manual reset (MR) and auxiliary RESET IN inputs-distinguishing it from MAX6384/MAX6387 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (nominal), ±2.5% over -40°C to +125°C - ensures reliable detection of 2.5V rail brownout without false triggers |
| Reset Timeout | 20ms (minimum) - provides sufficient hold time for μP initialization before release |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout recovery |
| Output Type | Active-low open-drain - allows wired-OR configuration with other reset sources and level translation |
| Reset Comparator Tempco | 60ppm/°C - limits threshold drift to <±15mV across full temperature range |
| Power-Down Reset Delay | 35µs (typical at VCC=1.8V) - rejects short transients while responding rapidly to sustained undervoltage |
Pinout & Package
MAX6381LT26D2+ is housed in a 6-pin μDFN package (1.5mm × 1.5mm, 0.5mm pitch, 0.8mm height) with wettable flanks, RoHS-compliant and AEC-Q100 qualified for automotive use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage |
| 2 | VCC | Primary supply input and monitored voltage source; operates from 1.0V to 5.5V |
| 3 | N.C. | No internal connection; must be left floating or tied to GND per layout guidelines |
| 4 | RESET | Active-low open-drain reset output; requires external pullup resistor to host rail |
| 5 | N.C. | No internal connection; must be left floating or tied to GND per layout guidelines |
| 6 | N.C. | No internal connection; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.63V with ±2.5% tolerance over -40°C to +125°C - eliminates need for external resistor divider calibration |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in portable medical monitors and wireless sensor nodes |
| Open-drain reset output | Supports 0.3V VOL at 80µA sink into 1.0V VCC - enables direct interface to 1.2V/1.8V logic domains |
| Negative transient immunity | Rejects 35µs glitches at 100mV overdrive - prevents spurious resets in noisy automotive environments |
| Valid reset down to 1.0V VCC | Guaranteed correct logic state at VCC ≥ 1.0V - ensures safe processor reset during deep brownout recovery |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: Coin-cell–powered environmental sensor transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Monitors 2.5V LDO output; asserts reset if voltage sags below 2.63V during RF transmission surge. Use Value: Prevents corrupted sensor readings and BLE stack lockup by enforcing clean restart before next measurement cycle. |
Use Scenario: DIN-rail mounted controller with isolated 24V-to-3.3V DC/DC powering FPGA and communication ICs. IC Role / Device Role / Timing Role: Supervises 3.3V rail feeding FPGA configuration memory; holds reset until stable post-power-up. Use Value: Eliminates FPGA configuration errors caused by marginal 3.3V ramp rates in industrial power supplies. |
| Automotive Body Control Module | Dual-Voltage Microcontroller System |
Use Scenario: 12V vehicle battery supplying 5V and 3.3V rails to MCU and CAN transceiver. IC Role / Device Role / Timing Role: Resets MCU when 3.3V rail drops below 2.63V during cold-crank event. Use Value: Ensures deterministic MCU reboot after engine start, avoiding CAN bus arbitration failures. |
Use Scenario: MCU with separate 1.8V core and 3.3V I/O supplies requiring coordinated reset timing. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V I/O rail; RESET output wired-OR'd with core-rail supervisor. Use Value: Enables synchronized release of both power domains using single open-drain reset bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 2.63V threshold, 240ms timeout, push-pull active-low output, SC70-3 package | Lacks open-drain flexibility; not suitable for wired-OR or level-shifted reset buses | Select when board space is constrained and no shared reset bus is required |
| TPS3808G125DBVR | 2.63V threshold, 20ms timeout, push-pull active-low, SOT-23-5 package; higher ICC (8μA @1.8V) | Includes manual reset input (MR); incompatible pinout and footprint | Select when MR functionality is needed and layout revision is acceptable |
Compared with MAX6381LT26D2+, MAX809TRD2+T offers smaller 3-pin SC70 packaging but sacrifices open-drain versatility, while TPS3808G125DBVR adds manual reset capability at the cost of higher quiescent current and incompatible pin mapping-making MAX6381LT26D2+ optimal for space-constrained, multi-source reset bus designs requiring ultra-low power.
Availability
MAX6381LT26D2+ is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, automotive body control units, and dual-voltage microcontroller systems requiring stable component supply across extended temperature ranges.
Supply support for MAX6381LT26D2+ 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 computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 product line delivers single/dual-voltage microprocessor supervisors optimized for ultra-low-power operation, wide temperature range (-40°C to +125°C), and robust transient immunity in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6381LT26D2+ and how tightly is it specified?
The MAX6381LT26D2+ has a nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). At +25°C, the threshold is specified as 2.56V (min) to 2.69V (max), and this window expands slightly at temperature extremes to maintain functional reliability without false triggering.
Does MAX6381LT26D2+ support manual reset functionality?
No, MAX6381LT26D2+ does not include a manual reset (MR) input. It is part of the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR and auxiliary RESET IN pins. Manual reset capability is only available in MAX6384–MAX6386 and MAX6390 variants-so MAX6381LT26D2+ is intended for applications where reset is triggered solely by VCC monitoring.
What package type and dimensions does MAX6381LT26D2+ use?
MAX6381LT26D2+ is supplied in a 6-pin μDFN package measuring 1.5mm × 1.5mm with 0.5mm pin pitch and 0.8mm maximum height. It features wettable flanks for automated optical inspection and complies with RoHS and AEC-Q100 Grade 2 automotive qualification standards.
Can MAX6381LT26D2+ operate reliably at VCC = 1.0V?
Yes, MAX6381LT26D2+ guarantees correct reset output logic state down to VCC = 1.0V. Its internal comparator and timer remain fully functional at this voltage, ensuring valid reset assertion during deep brownout conditions-critical for fail-safe behavior in energy-harvesting and ultra-low-power systems.
Is MAX6381LT26D2+ pin-compatible with older Maxim reset ICs like MAX809?
MAX6381LT26D2+ is not pin-compatible with MAX809 due to differing package types (6-pin μDFN vs. 3-pin SC70) and pin functions. However, it is functionally compatible and listed as a pin-compatible alternative to MAX809/MAX810/MAX803 in the datasheet's "Pin Compatible With" section-meaning system-level redesign is needed, but electrical behavior and timing align closely for drop-in functional replacement.
MAX6381LT26D2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX6381LT26D2+ FAQ
1.How can I place an order for MAX6381LT26D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT26D2+ 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 MAX6381LT26D2+ reliable?
The price and inventory of MAX6381LT26D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT26D2+ is usually 5 days.
3.What payment methods are accepted for MAX6381LT26D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT26D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT26D2+?
MAX6381LT26D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT26D2+ 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 MAX6381LT26D2+?
For technical support, including MAX6381LT26D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT26D2+ requirements.
6.How does Aetrix verify that MAX6381LT26D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6381LT26D2+ 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 MAX6381LT26D2+ meets industry standards.
7.What is the process for return or replacement of MAX6381LT26D2+?
All MAX6381LT26D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT26D2+, 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 MAX6381LT26D2+ part is unused and in its original packaging.
Return procedure for MAX6381LT26D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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