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Analog Devices Inc./Maxim Integrated MAX6381LT31D2+T
- Part No.:
- MAX6381LT31D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT31D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,364
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Product details
Overview
MAX6381LT31D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 3.08V 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 MAX6381LT31D2+T datasheet, MAX6381LT31D2+T pinout, MAX6381LT31D2+T application, or MAX6381LT31D2+T equivalent, key selection criteria include guaranteed reset validity at 1V VCC, ±2.5% threshold accuracy over –40°C to +125°C, negative-going transient immunity, and compatibility with dual-voltage monitoring architectures using external resistor dividers.
Technical Context
The MAX6381LT31D2+T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and internal 1.27V reference for auxiliary monitoring (though not used in this variant). Its reset assertion logic guarantees correct output state even as VCC drops to 1.0V, and its open-drain output requires an external pullup for system-level reset signaling.
Unlike variants with manual reset (MR) or RESET IN inputs, MAX6381LT31D2+T is a minimal three-function device: VCC monitoring only, fixed threshold, and open-drain active-low reset. It lacks MR or auxiliary input pins, distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (±2.5% over –40°C to +125°C); ensures reliable detection of 3.3V supply brownout |
| Reset Timeout | 20ms minimum; holds reset long enough for microprocessor power stabilization after VCC recovery |
| Supply Current | 3μA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage | 1.0V to 5.5V; supports valid reset assertion even during deep brownout before system shutdown |
| Output Type | Active-low open-drain; allows wired-OR reset bus configuration with multiple supervisors or logic devices |
| Reset Output Validity | Guaranteed down to VCC = 1.0V; eliminates need for external level-shifting or pulldown resistors in low-VCC scenarios |
| Transient Immunity | Negative-going VCC glitches < 35µs at 100mV overdrive do not trigger false reset; improves noise robustness in noisy power rails |
Pinout & Package
MAX6381LT31D2+T is housed in a 6-pin µDFN package (1.5mm × 1.0mm, 0.5mm pitch), RoHS-compliant and qualified for automotive temperature range (–40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage; must be low-impedance connection to system ground plane |
| 2 | VCC | Primary supply input and monitored voltage source; powers internal circuitry and feeds reset comparator |
| 3 | RESET | Active-low open-drain reset output; requires external pullup resistor (typically 10kΩ) to host supply rail |
| 4 | N.C. | No internal connection; left floating or tied to GND per layout best practice; no electrical function |
| 5 | N.C. | No internal connection; electrically isolated; no routing or termination required |
| 6 | N.C. | No internal connection; unused pad; may be connected to thermal pad or left unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 3.08V threshold | Eliminates external resistor divider and calibration; reduces BOM count and layout area in 3.3V systems |
| 20ms reset timeout | Matches typical microcontroller power-on reset timing requirements without requiring external RC timing components |
| Open-drain output | Enables shared reset bus across multiple ICs and supports mixed-voltage domain reset signaling |
| 1.0V VCC operation limit | Ensures deterministic reset behavior during final stages of battery discharge or power-fail conditions |
| ±2.5% threshold accuracy | Meets industrial-grade reliability requirements without derating or guard-banding in high-temperature environments |
Applications
| Power Monitoring in Portable Equipment | Dual-Voltage System Supervision |
|---|---|
Use Scenario: Monitoring 3.3V main supply in handheld medical diagnostic devices powered by Li-ion batteries with steep discharge curves. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting active-low reset when battery voltage falls below 3.08V during discharge. Use Value: Prevents corrupted memory writes and firmware crashes during low-battery brownout, extending usable runtime without unsafe operation. | Use Scenario: Coordinating power sequencing between 3.3V I/O and 1.2V core rails in FPGA-based edge AI accelerators. IC Role / Device Role / Timing Role: Standalone supervisor for 3.3V rail; output drives system-wide reset line shared with other supervisors via wired-OR. Use Value: Enables clean, synchronized reset assertion across voltage domains without additional logic or timing components. |
| Critical μP Reset in Industrial Controllers | Battery-Backed Real-Time Clock Supervision |
Use Scenario: Ensuring deterministic boot state in programmable logic controllers exposed to wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Single-point reset generator with guaranteed functionality down to 1.0V VCC and ±2.5% threshold stability. Use Value: Eliminates risk of spurious resets or missed brownouts in harsh environments where microcontroller internal reset may fail. | Use Scenario: Maintaining RTC integrity during main power loss in smart metering systems using supercapacitor backup. IC Role / Device Role / Timing Role: Monitors 3.3V backup supply feeding RTC and SRAM; asserts reset before voltage drops below safe retention level. Use Value: Preserves timekeeping accuracy and nonvolatile data integrity during extended power interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR31D2+T | Same 3.08V threshold, 20ms timeout, SC70-3 package; higher ICC (7μA typ at 1.8V vs. 3μA) | Lacks AEC-Q100 qualification; limited to commercial temperature range (–40°C to +85°C) | Select when cost-sensitive commercial designs prioritize smaller footprint over ultra-low current or automotive qualification. |
| TPS3808G30DBVR | 3.0V threshold (±0.5%), 20ms timeout, SOT-23-5; push-pull active-low output; 1.8μA ICC at 1.8V | Includes manual reset input (MR); requires PCB layout change due to different pinout and package (SOT-23 vs. µDFN) | Select when manual reset capability is required and board space permits SOT-23-5; verify reset timing compatibility with host processor. |
Compared with MAX6326XR31D2+T, MAX6381LT31D2+T offers lower quiescent current and automotive qualification; compared with TPS3808G30DBVR, it provides superior brownout immunity at ultra-low VCC but lacks MR functionality-making it optimal for fixed-supply, space-constrained, high-reliability applications.
Availability
MAX6381LT31D2+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical microprocessor systems, and industrial controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381LT31D2+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, mixed-signal, and power management ICs for high-reliability industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed reset supervision for space- and energy-constrained systems where deterministic power-on reset and brownout protection are mission-critical.
FAQ
What is the exact reset threshold voltage of MAX6381LT31D2+T?
The MAX6381LT31D2+T has a factory-set nominal reset threshold of 3.08V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet under suffix "31", corresponding to VTH(min) = 3.00V, VTH(nom) = 3.08V, and VTH(max) = 3.15V at +25°C.
Does MAX6381LT31D2+T support manual reset functionality?
No, MAX6381LT31D2+T does not include a manual reset (MR) input. It is a dedicated single-supply supervisor without MR or auxiliary RESET IN pins. Manual reset capability is only present in MAX6384–MAX6386 and MAX6390 variants, which feature pin 3 as MR in their 4-pin SC70 or 6-pin µDFN configurations.
What package type and dimensions does MAX6381LT31D2+T use?
MAX6381LT31D2+T uses a 6-pin µDFN package (outline number 21-0147), measuring 1.5mm × 1.0mm with 0.5mm pin pitch. It is RoHS-compliant ("+T" suffix), thermally enhanced, and rated for operation from –40°C to +125°C. Land pattern number 90-0080 applies for PCB layout.
Can MAX6381LT31D2+T monitor a second voltage rail?
No, MAX6381LT31D2+T monitors only the VCC supply. Auxiliary voltage monitoring via RESET IN is exclusive to MAX6387–MAX6389 variants, which dedicate pin 3 to that function. The MAX6381LT31D2+T pinout contains three N.C. terminals and no internal circuitry for secondary voltage comparison.
What is the minimum supply voltage at which MAX6381LT31D2+T guarantees correct reset output state?
MAX6381LT31D2+T guarantees valid reset output logic state down to VCC = 1.0V. This is explicitly specified in the Electrical Characteristics table and ensures reliable reset assertion during deep brownout conditions-critical for preserving system state in battery-depleted or failing power scenarios.
MAX6381LT31D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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)
MAX6381LT31D2+T FAQ
1.How can I place an order for MAX6381LT31D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT31D2+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 MAX6381LT31D2+T reliable?
The price and inventory of MAX6381LT31D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT31D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381LT31D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT31D2+T transactions.
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4.How is shipping managed for MAX6381LT31D2+T?
MAX6381LT31D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT31D2+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 MAX6381LT31D2+T?
For technical support, including MAX6381LT31D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT31D2+T requirements.
6.How does Aetrix verify that MAX6381LT31D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381LT31D2+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 MAX6381LT31D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381LT31D2+T?
All MAX6381LT31D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT31D2+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 MAX6381LT31D2+T part is unused and in its original packaging.
Return procedure for MAX6381LT31D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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