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Analog Devices Inc./Maxim Integrated MAX6381XR31D3-T
- Part No.:
- MAX6381XR31D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR31D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6381XR31D3-T from Maxim Integrated is a 3-pin SC70 packaged microprocessor supervisory circuit with factory-set 3.08V reset threshold, 140ms minimum VCC reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors single-supply rails in battery-powered embedded systems and asserts reset during brownout or power-up sequencing.
For engineers reviewing the MAX6381XR31D3-T datasheet, MAX6381XR31D3-T pinout, MAX6381XR31D3-T application, or MAX6381XR31D3-T equivalent, key selection criteria include its ±2.5% reset threshold accuracy over –40°C to +125°C, 3μA supply current at 1.8V, immunity to negative-going VCC transients, and compatibility with low-voltage μP reset inputs requiring valid logic states below 1.8V.
Technical Context
The MAX6381XR31D3-T implements a precision bandgap-based voltage comparator with internal 1.27V reference for threshold detection and a monolithic RC timer for deterministic reset timeout. Its open-drain RESET output requires an external pullup and remains asserted until VCC exceeds 3.08V and sustains for ≥140ms.
No manual reset (MR) or auxiliary RESET IN inputs are present - this variant is optimized for simple single-rail monitoring without user-initiated reset or dual-voltage supervision. Reset assertion is guaranteed valid for VCC ≥ 1.0V, enabling reliable operation during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (±2.5% over –40°C to +125°C); triggers reset when VCC falls below this level |
| Reset Timeout Period | 140ms minimum; ensures μP remains held in reset long enough for stable power rail recovery |
| Supply Current | 3μA at VCC = 1.8V; enables multi-year battery life in portable instrumentation |
| Operating Voltage Range | 1.0V to 5.5V; supports valid reset assertion even during severe undervoltage events |
| Output Type | Active-low open-drain; allows wired-OR configuration and level translation with external pullup |
| Reset Output Validity | Guaranteed correct logic state down to VCC = 1.0V; eliminates need for external reset conditioning circuits |
| Package | 3-pin SC70 (2.0mm × 2.1mm); ultra-small footprint for space-constrained PCB layouts |
Pinout & Package
MAX6381XR31D3-T is housed in a 3-pin SC70 package (Outline Number 21-0075, Land Pattern 90-0208), with pins arranged in a single row. The device has no NC or MR pins - all three terminals serve defined electrical functions.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; must be pulled up externally to VCC or another logic rail |
| 2 | VCC | Power supply input and monitored voltage rail; powers internal circuitry and sets reset threshold reference |
| 3 | GND | Analog and digital ground reference; required for accurate threshold comparison and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±2.5% tolerance across –40°C to +125°C - eliminates external resistor divider and calibration |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in always-on portable sensors and wearables |
| Negative-going transient immunity | Rejects VCC glitches ≤150µs wide (at 100mV overdrive) - prevents spurious resets in noisy power environments |
| Valid reset output at low VCC | RESET logic state guaranteed down to VCC = 1.0V - ensures deterministic μP initialization during deep brownout |
| Small-footprint packaging | 3-pin SC70 (2.0mm × 2.1mm) - saves >60% board area vs. SOT-23 while maintaining thermal performance |
Applications
| Portable Medical Sensors | Battery-Powered IoT Endpoints |
|---|---|
|
Use Scenario: Continuous glucose monitor operating from coin-cell battery with 2.8–3.3V discharge profile. IC Role / Device Role / Timing Role: Monitors main supply rail and holds MCU in reset until voltage stabilizes above 3.08V after cold start or battery insertion. Use Value: Prevents firmware execution errors during marginal power conditions; 140ms timeout ensures ADC reference and RF transceiver stabilize before boot. |
Use Scenario: LoRaWAN node powered by primary lithium thionyl chloride cell with gradual voltage decay. IC Role / Device Role / Timing Role: Single-point reset supervisor asserting active-low signal to ARM Cortex-M0+ reset pin via 10kΩ pullup. Use Value: 3μA supply current minimizes self-discharge; open-drain output allows direct interface to 3.3V-tolerant MCU reset input without level shifter. |
| Industrial Data Loggers | Automotive Body Control Modules |
|
Use Scenario: Ruggedized environmental logger deployed in remote locations with unregulated 3.3V supply derived from solar-charged LiFePO4. IC Role / Device Role / Timing Role: Provides fail-safe reset during intermittent solar charging dips and load-switching transients. Use Value: ±2.5% threshold accuracy ensures consistent trip point across temperature extremes; 3.08V threshold aligns precisely with MCU's minimum functional VDD. |
Use Scenario: Non-safety-critical cabin lighting controller supplied from vehicle 3.3V LDO with potential load-dump coupling. IC Role / Device Role / Timing Role: Supervises post-regulator rail and initiates controlled restart after brief undervoltage events caused by alternator ripple. Use Value: Immunity to sub-200µs negative transients avoids nuisance resets; AEC-Q100 qualified variants available (e.g., MAX6381XR31D3/V+T). |
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 | 3.08V threshold, 140ms timeout, push-pull active-low output; higher 15μA ICC at 1.8V | Lacks open-drain flexibility; requires dedicated reset rail; not suitable for wired-OR or level-shifted reset buses | Select when board layout prohibits external pullup or when driving capacitive loads >50pF directly |
| TPS3808G30DBVR | 3.0V threshold (±0.5%), 200ms timeout, open-drain active-low; 1.6μA ICC at 1.8V; requires external capacitor for timeout | Timeout programmable via capacitor; tighter threshold tolerance but less predictable timing due to cap variance | Select when ultra-low current (<2μA) is critical and timing tolerance >±20% is acceptable |
Compared with MAX809TRD3-T and TPS3808G30DBVR, MAX6381XR31D3-T delivers optimal balance of ultra-low current (3μA), fixed deterministic timing (140ms), and open-drain flexibility - making it ideal for compact, battery-sensitive designs where layout simplicity and timing predictability outweigh absolute minimum current or tightest threshold tolerance.
Availability
MAX6381XR31D3-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT endpoints, industrial data loggers, and automotive body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6381XR31D3-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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration for demanding environments.
The MAX6381–MAX6390 family delivers low-power, precision reset supervision for microprocessor-based systems - engineered specifically for battery-operated, automotive, and industrial equipment where supply stability and deterministic reset behavior are critical.
FAQ
What is the exact reset threshold voltage of MAX6381XR31D3-T and how tightly is it specified?
The MAX6381XR31D3-T has a nominal reset threshold of 3.08V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This corresponds to a min/max range of 3.00V to 3.15V at +25°C and 2.93V to 3.22V across temperature. The value is factory-trimmed and does not require external components.
Does MAX6381XR31D3-T include a manual reset input (MR) pin?
No, MAX6381XR31D3-T does not include a manual reset input. It is a basic single-supply reset supervisor with only RESET, VCC, and GND pins. Manual reset capability is present only in MAX6384–MAX6386 and MAX6390 variants - confirmed by the Pin Configuration diagrams and Selector Guide in the datasheet.
What is the minimum VCC at which MAX6381XR31D3-T guarantees correct RESET output logic state?
MAX6381XR31D3-T guarantees valid RESET output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not sustain correct comparator or timer operation. This specification ensures reliable reset assertion during deep brownout conditions common in battery-depleted systems.
Can MAX6381XR31D3-T be used with a 1.8V microcontroller that has an active-low reset input?
Yes, MAX6381XR31D3-T is fully compatible with 1.8V μCs. Its open-drain RESET output can be pulled up to 1.8V using a standard 10kΩ resistor, and its 3μA supply current at 1.8V minimizes loading. The device asserts RESET low when VCC drops below 3.08V - appropriate for supervising a higher-voltage supply feeding the 1.8V regulator.
Is MAX6381XR31D3-T qualified for automotive applications?
The base MAX6381XR31D3-T is not automotive-qualified, but the pin-compatible variant MAX6381XR31D3/V+T is AEC-Q100 qualified for automotive use. Both share identical electrical specifications and 3-pin SC70 packaging; the /V suffix denotes automotive qualification per the Ordering Information table in the datasheet.
MAX6381XR31D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6381XR31D3-T FAQ
1.How can I place an order for MAX6381XR31D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR31D3-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 MAX6381XR31D3-T reliable?
The price and inventory of MAX6381XR31D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR31D3-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR31D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR31D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR31D3-T?
MAX6381XR31D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR31D3-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 MAX6381XR31D3-T?
For technical support, including MAX6381XR31D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR31D3-T requirements.
6.How does Aetrix verify that MAX6381XR31D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR31D3-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 MAX6381XR31D3-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR31D3-T?
All MAX6381XR31D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR31D3-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 MAX6381XR31D3-T part is unused and in its original packaging.
Return procedure for MAX6381XR31D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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