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Analog Devices Inc./Maxim Integrated MAX6381LT30D3+T
- Part No.:
- MAX6381LT30D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT30D3+T.pdf
- Description:
- IC MPU/RESET CIRC 3.00V 6-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:15,700
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Product details
Overview
MAX6381LT30D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 3.0V reset threshold, 140ms minimum VCC reset timeout, and active-low open-drain RESET output. It monitors single supply voltage (1.0V–5.5V), consumes only 3μA at 1.8V, guarantees valid reset state down to VCC = 1V, and is qualified for automotive-grade operation (-40°C to +125°C). It is used in battery-powered embedded controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381LT30D3+T datasheet, MAX6381LT30D3+T pinout, MAX6381LT30D3+T application, or MAX6381LT30D3+T equivalent, key selection considerations include its 3.0V ±2.5% threshold accuracy over temperature, 140ms reset timeout, 6-pin μDFN package, open-drain output requiring external pullup, and compatibility with dual-voltage monitoring systems via auxiliary reset input variants.
Technical Context
The MAX6381LT30D3+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC rises above 3.0V, independent of supply ramp rate.
As an open-drain active-low supervisor, it requires an external pullup resistor on RESET and supports level-shifting to higher logic rails. It lacks MR or RESET IN pins - confirming it is a basic single-supply variant within the MAX6381–MAX6390 family, distinct from manual-reset or dual-monitoring versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.0V ±2.5% (±75mV) over -40°C to +125°C - ensures reliable detection of 3.3V rail brownout with margin |
| VCC Operating Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| Reset Timeout | 140ms minimum - holds processor in reset long enough for power stabilization and clock lock in MCU applications |
| Supply Current | 3μA at 1.8V - enables multi-year battery life in portable instrumentation and IoT edge nodes |
| Output Type | Active-low open-drain - allows wired-OR configuration and voltage-level translation via external pullup |
| Reset Validity | Guaranteed down to VCC = 1V - maintains correct logic state during severe undervoltage, preventing spurious release |
| Package | 6-pin μDFN (2mm × 2mm, 0.5mm pitch) - provides high-density mounting for space-constrained PCBs |
Pinout & Package
MAX6381LT30D3+T is housed in a 6-pin μDFN package (Outline 21-0147, Land Pattern 90-0080) with wettable flanks, RoHS-compliant, and rated for -40°C to +125°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be low-impedance connection |
| 2 | VCC | Primary supply input and monitored voltage rail; powers device and serves as reset threshold reference |
| 3 | N.C. | No internal connection; left unconnected per datasheet - no routing or termination required |
| 4 | RESET | Active-low open-drain output; requires external pullup resistor (typically 10kΩ–100kΩ) to host logic rail |
| 5 | N.C. | No internal connection; electrically isolated - must not be shorted or loaded |
| 6 | N.C. | No internal connection; unused pad - no solder mask opening or trace needed |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.0V threshold | Eliminates external resistor divider and calibration, reducing BOM count and layout area |
| 140ms minimum reset timeout | Ensures sufficient hold time for 3.3V LDO stabilization and crystal oscillator startup in ARM Cortex-M systems |
| 3μA supply current at 1.8V | Enables integration into always-on sensor nodes without compromising battery lifetime |
| Open-drain RESET with 0.3V VOL @ 80μA | Supports direct interface to 1.8V/2.5V/3.3V I/O domains using appropriate pullup voltage |
| Valid reset output down to VCC = 1V | Prevents premature release during slow discharge or undershoot events in Li-ion backup circuits |
Applications
| Industrial PLC Controller | Battery-Powered Data Logger |
|---|---|
|
Use Scenario: Compact programmable logic controller operating from 3.3V rail with intermittent Li-SOCl₂ battery backup. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and asserts open-drain RESET to ARM Cortex-M4 core during brownout or power loss. Use Value: 140ms timeout ensures firmware-safe shutdown before nonvolatile memory write corruption; 3μA quiescent current extends 10-year battery life. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 5 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection for ultra-low-power MSP430 microcontroller. Use Value: 3.0V threshold aligns precisely with 3.3V LDO dropout; open-drain output interfaces cleanly to 1.8V MCU reset pin via 10kΩ pullup. |
| Automotive Body Control Module | Dual-Voltage FPGA Configuration Circuit |
|
Use Scenario: Under-hood BCM powered by 5V DC-DC converter with wide ambient temperature swing (-40°C to +125°C). IC Role / Device Role / Timing Role: Supervises 3.3V domain powering CAN transceiver and microcontroller; asserts reset on undervoltage. Use Value: ±2.5% threshold accuracy over full temperature range prevents false resets during cold cranking or thermal cycling. |
Use Scenario: FPGA board requiring coordinated reset of 1.2V core and 3.3V I/O banks during power-up sequencing. IC Role / Device Role / Timing Role: Used alongside MAX6387 (with RESET IN) to monitor secondary rail; MAX6381LT30D3+T handles primary 3.3V rail. Use Value: Pin-compatible footprint enables shared layout with dual-monitoring variants; identical timing simplifies system-level reset coordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326LTR30D3+T | Same 3.0V threshold, 140ms timeout, and 6-pin μDFN; but push-pull active-low output (no external pullup required) | Eliminates need for external pullup resistor; better suited for single-rail systems where level translation is unnecessary | Select when board space permits simpler output drive and no level-shifting is needed |
| TPS3808G30DBVR | 3.0V threshold, 200ms timeout (not 140ms); SOT-23-5 package; 1.8μA typical ICC at 3.3V | Slightly longer timeout may delay system boot; different pinout requires PCB redesign | Choose for lower quiescent current in cost-sensitive industrial designs where 60ms extra timeout is acceptable |
Compared with MAX6326LTR30D3+T, MAX6381LT30D3+T trades external pullup requirement for greater flexibility in mixed-voltage systems; versus TPS3808G30DBVR, it offers tighter timeout control and automotive qualification but slightly higher ICC at 3.3V.
Availability
MAX6381LT30D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, automotive body control modules, and dual-voltage FPGA configuration circuits requiring stable component supply and AEC-Q100-aligned reliability.
Supply support for MAX6381LT30D3+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 precision analog and mixed-signal ICs for demanding industrial, automotive, and computing applications, emphasizing low power, high reliability, and small form factor.
MAX6381LT30D3+T belongs to the MAX6381–MAX6390 family of single/dual low-voltage microprocessor supervisors, engineered specifically for space-constrained, battery-sensitive, and thermally harsh environments where deterministic reset behavior is critical.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6381LT30D3+T?
The MAX6381LT30D3+T has a factory-set nominal reset threshold of 3.0V, with a guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This means the actual threshold falls between 2.925V and 3.075V at +25°C, and between 2.925V and 3.075V across temperature - confirmed in the Electrical Characteristics table under "VCC Reset Threshold".
Does MAX6381LT30D3+T support manual reset functionality?
No, MAX6381LT30D3+T does not include a manual reset (MR) input. It is a basic single-supply supervisor variant. Manual reset capability is present only in MAX6384/MAX6385/MAX6386 and MAX6390 variants - confirmed by the Selector Guide and Pin Configurations, which show MR pin absent in MAX6381 pinouts.
What package type and dimensions does MAX6381LT30D3+T use?
MAX6381LT30D3+T uses a 6-pin μDFN package (2mm × 2mm body, 0.5mm pin pitch), Outline Number 21-0147, with wettable flanks and RoHS-compliant finish. The land pattern is specified as 90-0080, and thermal resistance θJA is 477°C/W on a multilayer board - per the Package Information section.
Can MAX6381LT30D3+T monitor a second voltage rail?
No, MAX6381LT30D3+T does not support auxiliary voltage monitoring. It monitors only VCC. Dual-rail monitoring via RESET IN is exclusive to MAX6387/MAX6388/MAX6389 variants - confirmed by the Pin Description table and Selector Guide, which list RESET IN only for those part numbers.
What is the minimum reset timeout period for MAX6381LT30D3+T, and how is it implemented?
The MAX6381LT30D3+T provides a guaranteed-minimum 140ms reset timeout period (suffix D3), measured from the moment VCC rises above the 3.0V threshold until RESET deasserts. This is achieved via an internal RC timer, independent of supply ramp rate, and is validated across -40°C to +125°C per the Reset Timeout Period specification table.
MAX6381LT30D3+T 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX6381LT30D3+T FAQ
1.How can I place an order for MAX6381LT30D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT30D3+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 MAX6381LT30D3+T reliable?
The price and inventory of MAX6381LT30D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT30D3+T is usually 5 days.
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4.How is shipping managed for MAX6381LT30D3+T?
MAX6381LT30D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT30D3+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 MAX6381LT30D3+T?
For technical support, including MAX6381LT30D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT30D3+T requirements.
6.How does Aetrix verify that MAX6381LT30D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381LT30D3+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 MAX6381LT30D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381LT30D3+T?
All MAX6381LT30D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT30D3+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 MAX6381LT30D3+T part is unused and in its original packaging.
Return procedure for MAX6381LT30D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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