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Analog Devices Inc./Maxim Integrated MAX6381XR39D2+T
- Part No.:
- MAX6381XR39D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR39D2+T.pdf
- Description:
- IC MPU/RESET CIRC 3.90V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,532
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Product details
Overview
MAX6381XR39D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 3.9V reset threshold and 20ms minimum reset timeout, delivering ±2.5% threshold accuracy over -40°C to +125°C and consuming only 3μA at 1.8V. It features an active-low push-pull reset output and operates down to VCC = 1.0V, making it suitable for battery-powered industrial controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR39D2+T datasheet, MAX6381XR39D2+T pinout, MAX6381XR39D2+T application, or MAX6381XR39D2+T equivalent, key selection considerations include its 3-pin SC70 package, 3.9V threshold tolerance, 20ms reset timeout, push-pull active-low output architecture, and guaranteed reset validity down to 1V supply.
Technical Context
The MAX6381XR39D2+T implements a precision voltage comparator with internal 3.9V reference and a monostable timer that asserts reset for ≥20ms after VCC rises above threshold. Its reset output remains valid even as VCC drops to 1.0V, ensuring deterministic μP initialization during power-down sequences.
No manual reset (MR) input or auxiliary RESET IN functionality is included - this variant belongs to the base MAX6381 family subset with minimal pin count (3-pin SC70) and fixed single-supply monitoring only, distinguishing it from MR-enabled or dual-monitor variants like MAX6384 or MAX6387.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.90V nominal, ±2.5% over -40°C to +125°C - ensures robust trip point across automotive/industrial temperature range |
| Reset Timeout | 20ms minimum - provides sufficient hold time for slow-ramping digital logic to stabilize before release |
| 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 during deep brownout conditions down to 1V |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and drives heavy capacitive loads directly |
| Package | 3-pin SC70 (X3+2 outline) - ultra-compact footprint ideal for space-constrained portable designs |
| Reset Propagation Delay | 35μs max (VCC falling at 10mV/µs) - fast response to supply glitches without false triggering |
Pinout & Package
MAX6381XR39D2+T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), optimized for high-density PCB layouts with minimal board area usage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low when VCC < 3.9V; deasserts high after 20ms timeout - directly interfaces with μP /RESET pin without external components |
| 2 | VCC | Main supply input and monitored voltage rail - powers internal circuitry and serves as sole reset trigger source |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.9V threshold | Eliminates external resistor divider and calibration effort while maintaining ±2.5% accuracy across full temp range |
| 20ms guaranteed reset timeout | Ensures μP core and peripherals fully initialize before code execution resumes - prevents race conditions in embedded firmware |
| 3μA supply current at 1.8V | Extends battery life in always-on monitoring systems where supervisory ICs remain powered continuously |
| Valid reset output down to VCC = 1.0V | Guarantees clean, logic-level reset signal during uncontrolled power collapse - avoids metastability in downstream logic |
| 3-pin SC70 packaging | Reduces PCB real estate by >60% vs. traditional SOT-23, enabling miniaturized wearable and sensor node designs |
Applications
| Industrial PLC I/O Modules | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Monitoring 3.3V or 5V fieldbus power rails in DIN-rail mounted controllers subject to voltage sags during motor startup. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting /RESET to ARM Cortex-M4 microcontroller during brownout events. Use Value: 3.9V threshold aligns precisely with 3.3V rail tolerance limits; 20ms timeout exceeds typical FPGA configuration time. | Use Scenario: Long-term environmental sensor nodes powered by CR2032 coin cells operating intermittently over 5+ years. IC Role / Device Role / Timing Role: Ensuring safe boot sequence each time the MCU wakes from deep sleep, preventing corrupted flash writes. Use Value: 3μA quiescent current minimizes standby drain; 1.0V operational floor allows reset assertion until battery reaches end-of-life. |
| Medical Point-of-Care Devices | Automotive Body Control Modules |
Use Scenario: Portable ultrasound handsets with dual 1.8V/3.3V power domains where main processor must not execute invalid instructions during power ramp. IC Role / Device Role / Timing Role: Single-point reset generator for application SoC, triggered exclusively by 3.3V domain collapse. Use Value: ±2.5% threshold stability over -40°C to +125°C meets IEC 60601 thermal requirements without derating. | Use Scenario: Under-hood BCMs exposed to wide ambient swings where 5V supply may dip below 4.0V during cold-cranking. IC Role / Device Role / Timing Role: Supervising main 5V rail with 3.9V threshold to detect marginal undervoltage before ECU resets. Use Value: Negative-going transient immunity prevents spurious resets from ignition noise; AEC-Q100 qualified variants available. |
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 | Same 3-pin SC70 package; 3.08V reset threshold; 240ms timeout; higher 12μA ICC at 1.8V | Designed for legacy 3.3V systems needing longer timeout; less suitable for ultra-low-power or precise 3.9V trip point needs | Select when longer reset hold time is required and 3.08V threshold matches existing design margins |
| TPS3808G33DBVR | 3-pin SOT-23; 3.3V threshold; adjustable timeout via capacitor; 1.4μA ICC at 1.8V; no AEC-Q100 option | Offers timeout flexibility but requires external timing capacitor; lacks automotive qualification and tighter 3.9V match | Choose for cost-sensitive consumer designs where timeout tuning is preferred over fixed 20ms precision |
Compared with MAX6381XR39D2+T, MAX809TRD2+T provides longer reset hold time but sacrifices low-power efficiency and exact 3.9V threshold alignment, while TPS3808G33DBVR trades pinout compatibility and automotive readiness for timeout adjustability and lower quiescent current.
Availability
MAX6381XR39D2+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered data loggers, and medical point-of-care devices requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6381XR39D2+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.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessors in space- and energy-constrained environments, emphasizing factory-trimmed thresholds, wide temperature operation, and minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6381XR39D2+T?
The MAX6381XR39D2+T has a factory-set nominal reset threshold of 3.90V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This corresponds to a minimum threshold of 3.80V and maximum of 4.00V at +25°C, tightening to 3.79V–4.00V across temperature extremes per datasheet specifications.
Does the MAX6381XR39D2+T include a manual reset input (MR)?
No, the MAX6381XR39D2+T does not include a manual reset input. It belongs to the base MAX6381 series variant with only three pins (RESET, VCC, GND) and no MR functionality. Manual reset capability is present only in MAX6384/MAX6385/MAX6386/MAX6390 variants, which use 4-pin SC70 or 6-pin μDFN packages.
What is the minimum supply voltage at which the MAX6381XR39D2+T guarantees correct reset output behavior?
The MAX6381XR39D2+T guarantees valid reset output logic states down to VCC = 1.0V. Below this level, the internal circuitry cannot maintain defined output behavior. This feature ensures reliable reset assertion during deep brownout conditions common in battery-depleted systems before complete power loss.
Can the MAX6381XR39D2+T monitor a second voltage rail using RESET IN?
No, the MAX6381XR39D2+T does not support auxiliary voltage monitoring. The RESET IN function is exclusive to MAX6387/MAX6388/MAX6389 variants, which feature a dedicated pin and internal 1.27V reference comparator. The MAX6381XR39D2+T monitors only the VCC supply rail and has no secondary input capability.
Is the MAX6381XR39D2+T RoHS-compliant and lead-free?
Yes, the "+T" suffix in MAX6381XR39D2+T explicitly denotes a lead(Pb)-free and RoHS-compliant package per Maxim Integrated's ordering nomenclature. This applies to both the 3-pin SC70 package and associated assembly processes, meeting EU Directive 2011/65/EU requirements.
MAX6381XR39D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.9V
- 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:
- SC-70-3
MAX6381XR39D2+T FAQ
1.How can I place an order for MAX6381XR39D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR39D2+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 MAX6381XR39D2+T reliable?
The price and inventory of MAX6381XR39D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR39D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR39D2+T?
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4.How is shipping managed for MAX6381XR39D2+T?
MAX6381XR39D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR39D2+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 MAX6381XR39D2+T?
For technical support, including MAX6381XR39D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR39D2+T requirements.
6.How does Aetrix verify that MAX6381XR39D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR39D2+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 MAX6381XR39D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR39D2+T?
All MAX6381XR39D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR39D2+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 MAX6381XR39D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR39D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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