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Analog Devices Inc./Maxim Integrated MAX6381XR18D2-T
- Part No.:
- MAX6381XR18D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR18D2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,868
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Product details
Overview
MAX6381XR18D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 1.8V reset threshold and 20ms minimum reset timeout, featuring active-low open-drain reset output, guaranteed operation down to VCC = 1.0V, and ±2.5% threshold accuracy over –40°C to +125°C - used for reliable power-on reset in battery-powered microcontroller systems.
For engineers reviewing the MAX6381XR18D2-T datasheet, MAX6381XR18D2-T pinout, MAX6381XR18D2-T application, or MAX6381XR18D2-T equivalent, key selection criteria include its 3μA supply current at 1.8V, SC70-3 package footprint, open-drain reset architecture requiring external pullup, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.
Technical Context
The MAX6381XR18D2-T implements a precision voltage comparator monitoring VCC against a fixed 1.8V threshold, with internal timer asserting reset for ≥20ms after VCC recovers. Its open-drain RESET output requires an external pullup resistor and remains valid down to VCC = 1.0V, enabling robust reset signaling during brownout conditions.
No manual reset (MR) input or auxiliary RESET IN comparator is integrated - this variant belongs to the MAX6381/MAX6382/MAX6383 subgroup, distinguishing it from MR-equipped or dual-monitor variants like MAX6384 or MAX6387. It uses BiCMOS process technology and is rated for automotive-grade temperature range (–40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8V nominal, ±2.5% over –40°C to +125°C - ensures consistent reset assertion across industrial temperature range |
| Reset Timeout | 20ms minimum - guarantees μP remains held in reset long enough for stable power rail recovery |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage | 1.0V to 5.5V - supports valid reset signaling even during deep brownout before full power collapse |
| Output Type | Active-low open-drain - allows wired-OR reset bus configuration with multiple supervisors or logic devices |
| Package | 3-pin SC70 (X3+2 outline) - 1.25mm × 0.85mm footprint ideal for space-constrained portable designs |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
Pinout & Package
Delivered in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with 0.65mm pitch and thermal resistance θJA = 340.4°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - must be pulled up externally; asserts low when VCC < 1.8V or during timeout |
| 2 | VCC | Main supply input and monitored voltage rail - powers device and serves as primary reset trigger source |
| 3 | GND | Analog/digital ground reference - common return path for internal comparators and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.8V threshold | Eliminates external resistor divider, reducing BOM count and layout area in 1.8V core systems |
| 20ms reset timeout | Meets JEDEC JESD78 requirement for minimum reset pulse width in microcontroller startup sequences |
| 3μA supply current at 1.8V | Enables integration into always-on wake-up circuits without measurable impact on battery drain |
| Open-drain RESET output | Permits shared reset bus with other open-drain supervisors or logic devices without contention |
| Valid operation down to VCC = 1.0V | Ensures deterministic reset state during gradual power collapse, preventing spurious μP execution |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Coin-cell–powered wearable ECG sensor requiring guaranteed reset at power-on and brownout. IC Role / Device Role / Timing Role: Primary VCC supervisor generating clean active-low reset pulse to ARM Cortex-M0+ MCU. Use Value: 3μA quiescent current extends battery life beyond 5 years; 1.8V threshold matches MCU core voltage rail. | Use Scenario: Under-dash lighting controller exposed to wide ambient temperatures and load-dump transients. IC Role / Device Role / Timing Role: Single-rail supervisor monitoring 3.3V I/O supply in AEC-Q100–compliant module. Use Value: –40°C to +125°C rating and 35µs transient immunity prevent false resets during vehicle cranking events. |
| Industrial PLC I/O Submodules | Smart Meter Battery Backup Circuits |
Use Scenario: DIN-rail mounted analog input module powered from isolated 5V DC-DC converter. IC Role / Device Role / Timing Role: VCC monitor ensuring μC enters known state before initializing ADC calibration routines. Use Value: 20ms timeout exceeds typical 5V rail stabilization time; open-drain output interfaces directly to μC's nRST pin. | Use Scenario: AMI smart meter with supercapacitor backup maintaining RTC and memory during AC outage. IC Role / Device Role / Timing Role: Supervisor detecting 1.8V RTC rail collapse and asserting reset to preserve data integrity. Use Value: 1.8V threshold aligns precisely with RTC supply; operation down to 1.0V prevents reset loss during capacitor discharge tail. |
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 1.8V threshold and 20ms timeout, but push-pull active-low output; no open-drain capability | Requires dedicated reset line - cannot share bus with other open-drain devices | Select when board-level reset arbitration is unnecessary and lower output impedance is preferred |
| TPS3808G18DBVR | 1.8V threshold, 20ms timeout, open-drain output; higher 8μA ICC at 1.8V vs. 3μA | Wider operating range (0.8V–6.0V); includes watchdog timer not present in MAX6381XR18D2-T | Select when system requires combined reset + watchdog functionality, accepting higher quiescent current |
Compared with MAX809TRD2+T and TPS3808G18DBVR, the MAX6381XR18D2-T uniquely balances ultra-low 3μA supply current, open-drain flexibility, and automotive temperature support in a 3-pin SC70 - making it optimal for space- and power-constrained single-rail supervision where bus sharing or minimal self-heating matters.
Availability
MAX6381XR18D2-T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, and smart meter battery backup circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR18D2-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 industrial, automotive, communications, and computing markets.
The MAX6381–MAX6390 family delivers low-power, factory-trimmed μP reset supervisors targeting space-constrained, battery-operated, and high-reliability systems where predictable power-on sequencing and brownout protection are critical.
FAQ
What is the exact reset threshold voltage tolerance for MAX6381XR18D2-T over temperature?
The MAX6381XR18D2-T has a factory-set nominal reset threshold of 1.8V with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. At +25°C, tolerance tightens to ±1.5%. This is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" with VTH specified as 1.755V (min) to 1.845V (max) at room temperature and 1.755V to 1.845V over full temperature range - matching the 1.8V × (1 ± 0.025) calculation.
Does MAX6381XR18D2-T include a manual reset (MR) input?
No, the MAX6381XR18D2-T does not include a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Manual reset is only available on MAX6384–MAX6386 and MAX6390 variants. The MAX6381XR18D2-T pinout consists solely of RESET, VCC, and GND - confirmed in the Pin Description table and SC70 top-view diagram on page 9 of the datasheet.
What package type and dimensions does MAX6381XR18D2-T use?
The MAX6381XR18D2-T uses a 3-pin SC70 package (outline number 21-0075, package code X3+2), measuring 1.25mm × 0.85mm with 0.65mm pin pitch. Land pattern number is 90-0208. This RoHS-compliant, lead-free package is explicitly listed in the Ordering Information table for MAX6381XR__D_+T variants and verified in the Package Information section on page 2 of the datasheet.
Can MAX6381XR18D2-T operate reliably below 1.8V supply?
Yes, the MAX6381XR18D2-T guarantees correct reset output logic state down to VCC = 1.0V, though reset assertion occurs only when VCC falls below the 1.8V threshold. Its operational voltage range is 1.0V to 5.5V, and supply current remains stable at 3μA (typ) at 1.8V and increases only modestly to 6μA at 5.5V - enabling safe use in brownout scenarios where VCC sags temporarily below nominal but stays above 1.0V.
Is MAX6381XR18D2-T pin-compatible with older Maxim reset ICs like MAX809?
While the MAX6381XR18D2-T shares functional equivalence with MAX809 variants (e.g., MAX809TRD2+T) in threshold and timeout, it is not pin-compatible due to differing output architectures: MAX6381XR18D2-T uses open-drain RESET on pin 1, whereas MAX809TRD2+T uses push-pull active-low RESET. The datasheet states "pin compatible with MAX809…" only applies to functionally similar parts *within the same output-type group*, not across open-drain vs. push-pull variants.
MAX6381XR18D2-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:
- 1.8V
- 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
MAX6381XR18D2-T FAQ
1.How can I place an order for MAX6381XR18D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR18D2-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 MAX6381XR18D2-T reliable?
The price and inventory of MAX6381XR18D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR18D2-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR18D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR18D2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR18D2-T?
MAX6381XR18D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR18D2-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 MAX6381XR18D2-T?
For technical support, including MAX6381XR18D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR18D2-T requirements.
6.How does Aetrix verify that MAX6381XR18D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR18D2-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 MAX6381XR18D2-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR18D2-T?
All MAX6381XR18D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR18D2-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 MAX6381XR18D2-T part is unused and in its original packaging.
Return procedure for MAX6381XR18D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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