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Analog Devices Inc./Maxim Integrated MAX6381XR25D2+
- Part No.:
- MAX6381XR25D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR25D2+.pdf
- Description:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:3,295
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Product details
Overview
MAX6381XR25D2+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.5V reset threshold, 20ms minimum reset timeout, active-low push-pull reset output, and guaranteed operation down to VCC = 1V. It monitors single supply voltage in portable/battery-powered equipment and embedded controllers requiring ultra-low quiescent current (3µA at 1.8V) and high-accuracy threshold (±2.5% over –40°C to +125°C).
For engineers reviewing the MAX6381XR25D2+ datasheet, MAX6381XR25D2+ pinout, MAX6381XR25D2+ application, or MAX6381XR25D2+ equivalent, this page delivers verified pin configuration, exact reset timing behavior, true operating voltage range (1.0V–5.5V), confirmed SC70-3 package mapping, and validated alternative options for power-supply monitoring in space-constrained industrial and portable designs.
Technical Context
The MAX6381XR25D2+ 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 fixed 20ms minimum reset assertion period after VCC recovers above 2.5V, with immunity to negative-going VCC transients up to 100µs (at 100mV overdrive).
This device operates as a single-supply reset monitor only - it lacks manual reset (MR) input or auxiliary RESET IN functionality, distinguishing it from MAX6384/MAX6387 variants. Its push-pull active-low RESET output drives directly into µP reset inputs without external pull-up, and remains valid down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.50V (nominal), ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Reset Timeout | 20ms (minimum) - guarantees µP initialization completes before code execution resumes |
| Supply Current | 3µA at VCC = 1.8V - enables multi-year battery life in always-on sensor nodes |
| Operating Voltage | 1.0V to 5.5V - supports direct interface with 1.2V, 1.8V, 2.5V, 3.3V, and 5V logic domains |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor on RESET line |
| Reset Validity | Guaranteed down to VCC = 1V - prevents spurious release during deep brownout recovery |
| Tempco | 60ppm/°C - limits threshold drift to <±15mV over full temperature range |
Pinout & Package
MAX6381XR25D2+ is housed in a 3-pin SC70-3 package (package code X3-2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane |
| 2 | RESET | Active-low push-pull output; asserts low during reset condition and releases high after timeout |
| 3 | VCC | Power supply input and monitored voltage source; powers internal circuitry and sets reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.5V threshold | Eliminates external resistor divider and calibration effort in 2.5V system monitoring |
| 20ms fixed reset timeout | Matches typical µP internal reset stabilization time without requiring external RC timing components |
| 3µA supply current at 1.8V | Reduces standby power in battery-backed real-time clocks and IoT edge sensors |
| Push-pull active-low RESET | Drives standard µP reset pins directly - no pull-up resistor, no I²C bus contention risk |
| Operation down to VCC = 1V | Prevents premature reset deassertion during slow-ramp or weak-battery power-up sequences |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch with coin-cell battery and ARM Cortex-M0+ MCU requiring deterministic reset during battery voltage sag. IC Role / Device Role / Timing Role: Monitors 2.5V analog front-end supply and asserts active-low RESET to halt MCU until stable power returns. Use Value: 20ms timeout ensures ADC reference settles fully; 3µA quiescent current extends battery life beyond 3 years. | Use Scenario: DIN-rail mounted digital input module powered from 24VDC-to-2.5V isolated DC/DC converter. IC Role / Device Role / Timing Role: Detects undervoltage on 2.5V logic rail and holds µP in reset during transient dips caused by relay coil switching. Use Value: ±2.5% threshold accuracy prevents false resets at marginal 2.44V–2.56V range; 60ppm/°C tempco maintains reliability across –25°C to +70°C cabinet temperatures. |
| Smart Meter Battery Backup | Automotive Body Control Unit |
Use Scenario: Electricity meter with supercapacitor backup maintaining RTC and tamper-detection logic during main AC failure. IC Role / Device Role / Timing Role: Supervises 2.5V backup rail generated from supercapacitor discharge curve. Use Value: Guaranteed reset validity down to VCC = 1V prevents clock corruption during final 10% of capacitor discharge. | Use Scenario: BCM sub-module monitoring 2.5V CAN transceiver supply in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Triggers hard reset of local microcontroller when 2.5V rail drops below 2.44V due to load dump or cold-crank event. Use Value: Negative-going transient immunity (100µs @ 100mV overdrive) rejects ignition noise without false triggering. |
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 2.5V threshold and 20ms timeout, but ±3% accuracy over –40°C to +85°C only; 10µA ICC at 1.8V | Limited to commercial temperature range; higher supply current reduces battery lifetime | Select when cost sensitivity outweighs extended temperature or ultra-low power requirements |
| TPS3808G25DBVR | 2.5V threshold, 20ms timeout, ±0.5% initial accuracy, but 1.5µA ICC at 1.8V; requires external pull-up for open-drain output | Higher accuracy and lower ICC, but open-drain output adds BOM cost and layout complexity | Select when highest threshold precision and lowest power are critical, and pull-up resistor is acceptable |
Compared with MAX809TRD2+T, MAX6381XR25D2+ offers tighter threshold tolerance over wider temperature range and 3.3× lower supply current; compared with TPS3808G25DBVR, it eliminates external pull-up requirement at the cost of slightly relaxed accuracy - making it optimal for compact, cost-sensitive industrial designs where push-pull drive is preferred.
Availability
MAX6381XR25D2+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup systems, and automotive body control units requiring stable component supply with long-term lifecycle support.
Supply support for MAX6381XR25D2+ 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 demanding industrial, automotive, and communications applications.
The MAX6381–MAX6390 family was engineered specifically for ultra-low-power, high-accuracy power-supply supervision in space-constrained embedded systems - prioritizing sub-µA quiescent current, wide temperature operation, and pin-compatible scalability across reset thresholds and timeouts.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6381XR25D2+?
The MAX6381XR25D2+ has a nominal reset threshold of 2.50V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This means the actual threshold falls between 2.44V and 2.56V under all conditions, as confirmed in the Electrical Characteristics table of the official datasheet.
Does MAX6381XR25D2+ include a manual reset input (MR)?
No, MAX6381XR25D2+ does not feature a manual reset input. It is a basic single-supply supervisory circuit with only VCC, GND, and RESET pins. Manual reset capability is present only in MAX6384/MAX6385/MAX6386/MAX6390 variants - confirmed by the Selector Guide and Pin Description sections of the datasheet.
What package type and dimensions does MAX6381XR25D2+ use?
MAX6381XR25D2+ uses the 3-pin SC70-3 package (package code X3-2), with body dimensions of 2.0mm × 2.1mm × 0.95mm and gull-wing leads. This is explicitly stated in the Ordering Information table and verified in the Package Information section (drawing 21-0075).
Can MAX6381XR25D2+ monitor a second voltage rail?
No, MAX6381XR25D2+ monitors only the VCC supply rail. Auxiliary voltage monitoring via RESET IN is exclusive to MAX6387/MAX6388/MAX6389 variants, as documented in the Selector Guide and Detailed Description sections - MAX6381XR25D2+ has no RESET IN pin or associated comparator.
What is the minimum supply voltage at which MAX6381XR25D2+ guarantees correct RESET output state?
MAX6381XR25D2+ guarantees valid RESET output logic state down to VCC = 1.0V, as specified in both the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures reliable reset assertion even during deep brownout conditions where other supervisors may release prematurely.
MAX6381XR25D2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.5V
- 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
MAX6381XR25D2+ FAQ
1.How can I place an order for MAX6381XR25D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR25D2+ 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 MAX6381XR25D2+ reliable?
The price and inventory of MAX6381XR25D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR25D2+ is usually 5 days.
3.What payment methods are accepted for MAX6381XR25D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR25D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR25D2+?
MAX6381XR25D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR25D2+ 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 MAX6381XR25D2+?
For technical support, including MAX6381XR25D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR25D2+ requirements.
6.How does Aetrix verify that MAX6381XR25D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6381XR25D2+ 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 MAX6381XR25D2+ meets industry standards.
7.What is the process for return or replacement of MAX6381XR25D2+?
All MAX6381XR25D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR25D2+, 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 MAX6381XR25D2+ part is unused and in its original packaging.
Return procedure for MAX6381XR25D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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