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Analog Devices Inc./Maxim Integrated MAX6381LT44D3+T
- Part No.:
- MAX6381LT44D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT44D3+T.pdf
- Description:
- IC MPU/RESET CIRC 4.38V 6-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,188
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Product details
Overview
MAX6381LT44D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.38V reset threshold, 140ms minimum VCC reset timeout, open-drain active-low RESET output, and operation down to VCC = 1.0V. It monitors single-supply rails in battery-powered systems and portable electronics where precise brownout detection and ultra-low quiescent current (3μA at 1.8V) are critical.
For engineers reviewing the MAX6381LT44D3+T datasheet, MAX6381LT44D3+T pinout, MAX6381LT44D3+T application, or MAX6381LT44D3+T equivalent, this device serves as a precision voltage monitor for power-up/power-down sequencing, brownout protection in embedded controllers, and supply supervision in space-constrained industrial sensors requiring AEC-Q100-qualified reliability.
Technical Context
The MAX6381LT44D3+T implements a precision bandgap-based voltage comparator with ±2.5% reset threshold accuracy over –40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 140ms reset assertion after VCC recovers above 4.38V.
This variant belongs to the MAX6381–MAX6390 family's open-drain active-low subgroup (MAX6381/MAX6383/MAX6386/MAX6389/MAX6390), lacks manual reset (MR) and auxiliary RESET IN inputs, and uses a fixed threshold-no external resistor divider required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (4.27V min / 4.48V max); ensures reliable detection of 4.5V rail brownout before system instability. |
| VCC Supply Current | 3μA at +1.8V; enables multi-year battery life in always-on IoT sensor nodes. |
| Reset Timeout Period | 140ms minimum; provides sufficient hold time for μP initialization and peripheral stabilization. |
| Operating Voltage Range | 1.0V to 5.5V; guarantees valid RESET output state even during deep brownout down to 1V. |
| Reset Output Type | Open-drain active-low; requires external pullup but supports wired-OR configuration and mixed-voltage interfacing. |
| Temperature Range | –40°C to +125°C; qualified for under-hood automotive and industrial control environments. |
| Reset Threshold Accuracy | ±2.5% over full temperature range; eliminates need for calibration in production test. |
Pinout & Package
MAX6381LT44D3+T is housed in a 6-pin μDFN package (1.5mm × 1.5mm, 0.5mm pitch, 0.8mm height) with wettable flanks for automated optical inspection. The package is RoHS-compliant and lead-free (+T suffix).
| Pin/Terminal | 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 triggers reset when below 4.38V. |
| 3 | N.C. | No internal connection; left floating or tied to GND per layout best practice; no electrical function. |
| 4 | RESET | Open-drain active-low reset output; sinks current when asserted; requires external pullup resistor (typically 10kΩ–100kΩ). |
| 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-trimmed reset threshold | 4.38V with ±2.5% tolerance over –40°C to +125°C-eliminates external resistor network and calibration. |
| Ultra-low supply current | 3μA at 1.8V enables >10-year battery life in coin-cell-powered devices without compromising supervision integrity. |
| Valid RESET down to VCC = 1.0V | Ensures deterministic reset behavior during deep undervoltage events, preventing runaway logic states. |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches up to 200mV below threshold-reduces false resets in noisy power environments. |
| Small 6-pin μDFN footprint | 1.5mm × 1.5mm area saves >60% board space vs. SOIC-8; compatible with high-density PCB assembly. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch monitoring heart rhythm continuously on CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts RESET if battery sags below 3.0V, halting ADC sampling and BLE transmission until stable. Use Value: 3μA quiescent current extends battery life to 3.2 years; 4.38V threshold prevents premature shutdown during brief load transients. |
Use Scenario: DIN-rail mounted analog input module operating in factory ambient (–25°C to +70°C). IC Role / Device Role / Timing Role: Monitors 5V system rail; holds microcontroller in reset during AC line dips or relay switching noise. Use Value: ±2.5% threshold accuracy over temperature avoids field failures due to drift; 140ms timeout exceeds typical PLC boot sequence. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: Door module powered from vehicle battery (9V–16V) with local 3.3V regulator. IC Role / Device Role / Timing Role: Detects 3.3V rail collapse during cold-crank (6V battery dip); asserts open-drain RESET to MCU and CAN transceiver. Use Value: –40°C to +125°C rating meets AEC-Q100 Grade 2; open-drain output interfaces safely with 5V-tolerant MCU reset pins. |
Use Scenario: Revenue-grade meter with tamper detection, operating 24/7 on utility-supplied 3.3V rail. IC Role / Device Role / Timing Role: Guarantees clean power-on reset and detects brownout during grid fluctuations or capacitor aging. Use Value: 140ms timeout accommodates slow-starting isolated DC/DC converters; 1.0V operation ensures reset validity during final discharge phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR44D3+T | Same 4.38V threshold and 140ms timeout, but 3-pin SC70 package (smaller footprint, no N.C. pins). | Lacks μDFN thermal performance; unsuitable for high-temperature industrial use above 85°C ambient. | Select when board space is <1.0mm² critical and thermal dissipation <100mW. |
| TLV803EB29DBZR | 4.38V threshold, 140ms timeout, SOT-23-3 package; higher 8μA ICC at 1.8V; ±3% threshold accuracy. | Lower accuracy and higher current reduce battery life by ~2.3× vs. MAX6381LT44D3+T in long-life designs. | Choose only if legacy SOT-23 footprint compatibility is mandatory and thermal/accuracy margins allow. |
Compared with MAX6326XR44D3+T and TLV803EB29DBZR, MAX6381LT44D3+T delivers superior thermal robustness via μDFN, lowest ICC for extended battery runtime, and tighter threshold tolerance-making it optimal for automotive and industrial applications demanding AEC-Q100 compliance and long-term stability.
Availability
MAX6381LT44D3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381LT44D3+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 power, sensing, and interface applications, with emphasis on low-power, high-reliability solutions for automotive and industrial markets.
The MAX6381–MAX6390 product line delivers single/dual low-voltage supervisory circuits optimized for battery-powered and harsh-environment systems requiring guaranteed reset behavior, minimal current draw, and AEC-Q100 qualification.
FAQ
What is the exact reset threshold voltage of MAX6381LT44D3+T and how is it specified?
The MAX6381LT44D3+T has a factory-set nominal reset threshold of 4.38V, with guaranteed minimum and maximum values of 4.27V and 4.48V respectively at +25°C. Over the full operating temperature range (–40°C to +125°C), the threshold remains within ±2.5% of nominal, ensuring predictable brownout detection across environmental extremes without external trimming.
Does MAX6381LT44D3+T include a manual reset input (MR) or auxiliary RESET IN pin?
No, MAX6381LT44D3+T does not include MR or RESET IN functionality. It is a single-supply, fixed-threshold supervisory circuit with only VCC, GND, and open-drain RESET pins. Manual reset capability is present only in MAX6384–MAX6386 and MAX6390 variants; auxiliary monitoring is exclusive to MAX6387–MAX6389.
What is the minimum VCC level at which MAX6381LT44D3+T guarantees correct RESET output state?
MAX6381LT44D3+T guarantees valid RESET output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may become indeterminate. This feature ensures deterministic reset behavior during deep brownout conditions common in battery-depleted systems, preventing spurious MCU execution.
Can MAX6381LT44D3+T be used in automotive applications, and what qualification does it hold?
Yes, MAX6381LT44D3+T is rated for –40°C to +125°C operation and is AEC-Q100 qualified (Grade 2). Its μDFN package, tight threshold accuracy, and robust transient immunity make it suitable for under-hood and cabin automotive modules including body control units, lighting controllers, and infotainment power supervisors.
What are the key differences between the μDFN and SC70 packages offered for MAX6381 variants?
The 6-pin μDFN package (used by MAX6381LT44D3+T) offers superior thermal performance (θJA = 477°C/W) and higher power dissipation margin than the 3-pin SC70 (θJA = 340.4°C/W), enabling reliable operation in high-ambient-temperature industrial environments. The μDFN also provides better mechanical stability and wettable flanks for automated AOI.
MAX6381LT44D3+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:
- 4.38V
- 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)
MAX6381LT44D3+T FAQ
1.How can I place an order for MAX6381LT44D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT44D3+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 MAX6381LT44D3+T reliable?
The price and inventory of MAX6381LT44D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT44D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381LT44D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT44D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT44D3+T?
MAX6381LT44D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT44D3+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 MAX6381LT44D3+T?
For technical support, including MAX6381LT44D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT44D3+T requirements.
6.How does Aetrix verify that MAX6381LT44D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381LT44D3+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 MAX6381LT44D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381LT44D3+T?
All MAX6381LT44D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT44D3+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 MAX6381LT44D3+T part is unused and in its original packaging.
Return procedure for MAX6381LT44D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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