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Analog Devices Inc./Maxim Integrated MAX6381XR26D3+T
- Part No.:
- MAX6381XR26D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR26D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,533
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Product details
Overview
MAX6381XR26D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set 2.63V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and active-low push-pull reset output. It monitors single-supply voltages from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered microcontroller power-up sequencing.
For engineers reviewing the MAX6381XR26D3+T datasheet, MAX6381XR26D3+T pinout, MAX6381XR26D3+T application, or MAX6381XR26D3+T equivalent, key selection considerations include its precise 2.63V threshold tolerance, 140ms reset hold time, SC70 footprint compatibility with legacy MAX809/MAX6326 families, and guaranteed operation across automotive temperature range (-40°C to +125°C).
Technical Context
This device implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over full temperature range and 60ppm/°C tempco, paired with a digitally controlled monostable timer that enforces a fixed 140ms minimum reset assertion after VCC recovery. The push-pull output drives low during reset and high otherwise, eliminating need for external pullup.
No manual reset (MR) or auxiliary RESET IN inputs are present - confirming MAX6381XR26D3+T is a dedicated single-supply, no-external-control variant within the MAX6381–MAX6390 family, distinct from MR-equipped MAX6384–MAX6386 or dual-monitor MAX6387–MAX6389 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive environments |
| Reset Timeout | 140ms minimum - holds μP in reset long enough for stable clock and supply settling post-power-up | 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 down to 1V VCC |
| Output Type | Active-low push-pull - directly interfaces with standard μP /RESET pins without external components |
| Package | 3-pin SC70 (X3+2 outline) - 1.25mm × 0.85mm footprint, compatible with high-density portable PCB layouts |
| Temperature Range | -40°C to +125°C - AEC-Q100 qualified for under-hood and industrial control applications |
Pinout & Package
3-pin SC70 package (Outline 21-0075, Land Pattern 90-0208), footprint-compatible with industry-standard low-pin-count supervisory ICs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output - asserts low during VCC undervoltage or brownout; deasserts high after 140ms timeout |
| 2 | VCC | Main supply input and monitored voltage source - powers internal circuitry and feeds reset comparator |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Threshold | 2.63V with ±2.5% accuracy over -40°C to +125°C - eliminates need for external calibration in automotive modules |
| Ultra-Low Quiescent Current | 3μA at +1.8V - extends battery life in always-on sensor nodes beyond 10 years |
| Guaranteed Reset Validity | Operates correctly down to VCC = 1V - ensures deterministic μP initialization even during severe brownout |
| Negative-Going Transient Immunity | Rejects VCC glitches < 35µs duration at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Small Footprint | 3-pin SC70 (1.25mm × 0.85mm) - saves >50% board area vs. SOT-23 alternatives |
Applications
| Power-Up Sequencing for Portable MCUs | Battery-Voltage Monitoring in Wearables |
|---|---|
Use Scenario: Ensuring clean boot of ARM Cortex-M0+ MCU in fitness tracker during Li-ion battery discharge from 3.6V to 2.7V. IC Role / Device Role / Timing Role: Supervisory circuit asserting /RESET until VCC exceeds 2.63V and remains stable for ≥140ms. Use Value: Prevents corrupted firmware execution during marginal battery conditions by enforcing minimum reset hold time. | Use Scenario: Detecting end-of-life battery condition in Bluetooth earbuds before shutdown. IC Role / Device Role / Timing Role: Monitoring core rail voltage and triggering graceful firmware save-and-sleep sequence at 2.63V threshold. Use Value: Enables user notification and data preservation prior to complete power loss. |
| Industrial Sensor Node Power Management | Automotive Body Control Module (BCM) Reset |
Use Scenario: Maintaining reliable operation of LoRaWAN node powered by energy harvesting (supercap + solar cell). IC Role / Device Role / Timing Role: Holding microcontroller in reset during intermittent supply dips below 2.63V, then releasing after 140ms stabilization. Use Value: Eliminates false wakeups and communication errors caused by transient supply droop. | Use Scenario: Providing fail-safe reset for 16-bit MCU in door module exposed to load-dump transients. IC Role / Device Role / Timing Role: Asserting reset during ignition cycling and battery voltage sag, with guaranteed function down to 1V VCC. Use Value: Meets ISO 16750-2 pulse 4 requirements via inherent noise immunity and wide operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | Same 2.63V threshold and 140ms timeout, but rated only to +85°C (not automotive-grade) | Limited to commercial/industrial ambient, not suitable for under-hood or extended-temperature deployments | Select when cost sensitivity outweighs temperature requirement and AEC-Q100 compliance is unnecessary |
| TLV803EB26DBZR | 2.64V threshold (±1%), 140ms timeout, 1.8V–6V operation, but 5μA typical ICC at +1.8V (vs. 3μA) | Higher supply current reduces battery lifetime in ultra-low-power designs; identical SC70 footprint | Choose if tighter threshold tolerance is prioritized over quiescent current in non-battery-critical systems |
Compared with MAX809TRD3+T and TLV803EB26DBZR, MAX6381XR26D3+T uniquely combines AEC-Q100 qualification, 3μA ultra-low ICC, and guaranteed 1V operation - making it the only option among the three validated for automotive body electronics with multi-year battery operation.
Availability
MAX6381XR26D3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical microprocessor power monitoring, and automotive body control modules requiring stable component supply across extended temperature ranges.
Supply support for MAX6381XR26D3+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-constrained, battery-sensitive, and thermally harsh environments - with variants optimized for single/dual supply monitoring and manual reset capability.
FAQ
What is the exact reset threshold voltage of MAX6381XR26D3+T and how tightly is it specified?
The MAX6381XR26D3+T has a factory-trimmed nominal reset threshold of 2.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This specification is confirmed in the Electrical Characteristics table on page 2 of the datasheet, where VTH min/max values are listed as 2.56V and 2.69V at +25°C, and maintained across temperature via 60ppm/°C tempco.
Does MAX6381XR26D3+T include a manual reset input (MR) pin?
No, MAX6381XR26D3+T does not include a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality - unlike MAX6384–MAX6386 or MAX6390. Pin 2 is VCC, Pin 1 is RESET, and Pin 3 is GND; no MR terminal is present or internally connected.
What is the minimum supply voltage at which MAX6381XR26D3+T guarantees correct reset output behavior?
MAX6381XR26D3+T guarantees valid reset output logic state down to VCC = 1.0V, as explicitly stated in both the Absolute Maximum Ratings and Detailed Description sections. Below 1.0V, reset behavior is not characterized - but at 1.0V and above, the push-pull output maintains correct active-low assertion and deassertion timing.
Is MAX6381XR26D3+T pin-compatible with older Maxim reset ICs like MAX809?
Yes, MAX6381XR26D3+T is pin-compatible with MAX809TRD3+T and other members of the MAX809/MAX810 family in the 3-pin SC70 package. Both share identical pinout (Pin 1 = RESET, Pin 2 = VCC, Pin 3 = GND) and footprint (Outline 21-0075), enabling drop-in replacement without PCB modification - provided the temperature and qualification requirements align.
What reset timeout period is implemented in MAX6381XR26D3+T, and is it adjustable?
MAX6381XR26D3+T implements a fixed 140ms minimum reset timeout period (suffix "D3"), as defined in the Reset Timeout Delay table. This value is factory-programmed and non-adjustable - no external capacitor or resistor can modify the delay. The actual timeout may extend up to 280ms depending on process and temperature, but the guaranteed minimum remains 140ms.
MAX6381XR26D3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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:
- SC-70-3
MAX6381XR26D3+T FAQ
1.How can I place an order for MAX6381XR26D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR26D3+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 MAX6381XR26D3+T reliable?
The price and inventory of MAX6381XR26D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR26D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR26D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR26D3+T?
MAX6381XR26D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR26D3+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 MAX6381XR26D3+T?
For technical support, including MAX6381XR26D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D3+T requirements.
6.How does Aetrix verify that MAX6381XR26D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR26D3+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 MAX6381XR26D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR26D3+T?
All MAX6381XR26D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D3+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 MAX6381XR26D3+T part is unused and in its original packaging.
Return procedure for MAX6381XR26D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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