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Analog Devices Inc./Maxim Integrated MAX6381XR39D2+
- Part No.:
- MAX6381XR39D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR39D2+.pdf
- Description:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:6,879
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Product details
Overview
MAX6381XR39D2+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 3.9V reset threshold, 20ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors +1.8V to +5.0V supply rails in space-constrained embedded systems, consuming only 3µA at +1.8V. Used in portable battery-powered equipment for reliable power-on reset assertion during brownout conditions.
For engineers reviewing the MAX6381XR39D2+ datasheet, MAX6381XR39D2+ pinout, MAX6381XR39D2+ application, or MAX6381XR39D2+ equivalent, key selection criteria include reset threshold accuracy (±2.5% over -40°C to +125°C), guaranteed reset validity at VCC ≥1V, SC70-3 package footprint, 20ms timeout timing, and open-drain output requiring external pull-up.
Technical Context
The MAX6381XR39D2+ implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over full industrial temperature range (-40°C to +125°C) and 60ppm/°C tempco. Its internal timer generates a fixed 20ms minimum reset timeout after VCC rises above the 3.9V threshold.
No manual reset (MR) input or auxiliary RESET IN functionality is present - this variant is a single-supply, fixed-threshold, open-drain reset monitor with no user-adjustable inputs. Reset output state remains valid down to VCC = 1.0V, enabling robust behavior during deep brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.90V (nominal), ±2.5% tolerance over -40°C to +125°C - ensures deterministic reset assertion across temperature without calibration. |
| Reset Timeout | 20ms (minimum) - guarantees µP remains held in reset long enough for stable power rail settling before release. |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in always-on monitoring applications. |
| Operating Voltage | +1.0V to +5.5V - supports valid reset signaling even during severe undervoltage events down to 1V. |
| Output Type | Active-low open-drain - requires external pull-up; allows wired-OR configuration and level translation with host logic. |
| Reset Propagation Delay | 35µs (max) for VCC falling through threshold - ensures fast response to rapid supply collapse. |
| Package | 3-pin SC70 (X3-2) - 1.25mm × 0.85mm footprint ideal for ultra-compact PCB layouts. |
Pinout & Package
MAX6381XR39D2+ is housed in a lead-free 3-pin SC70 package (pkg code X3-2), measuring 1.25mm × 0.85mm × 0.8mm with gull-wing leads. Pin 1 is RESET (active-low open-drain), Pin 2 is VCC, and Pin 3 is GND - no NC or MR pins present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | RESET (open-drain) | Active-low reset signal output; must be pulled up externally (e.g., 10kΩ to VIO); sinks current when asserted. |
| Pin 2 | VCC | Main supply input and monitored voltage rail; powers internal circuitry and sets fixed 3.9V reset threshold. |
| Pin 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.9V threshold | Eliminates external resistor divider and calibration effort; reduces BOM count and layout area. |
| 20ms guaranteed minimum timeout | Ensures sufficient hold time for all common µP power-up sequences without software intervention. |
| 3µA supply current at 1.8V | Enables integration into energy-harvesting and coin-cell-powered devices without compromising runtime. |
| Valid reset down to VCC = 1.0V | Prevents spurious release during slow power-down or weak battery conditions. |
| SC70-3 package | Provides smallest footprint in the MAX6381–MAX6390 family - critical for wearables and miniaturized IoT nodes. |
Applications
| Portable Medical Sensors | Battery-Powered Telematics |
|---|---|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output; asserts open-drain RESET to microcontroller on VCC drop below 3.9V during battery sag. Use Value: Prevents firmware crash during low-battery brownout; 20ms timeout ensures stable clock startup before MCU executes bootloader. | Use Scenario: OBD-II tracker powered by vehicle battery with cold-cranking voltage dips to 6V. IC Role / Device Role / Timing Role: Monitors 3.3V system rail derived from buck converter; holds MCU in reset until rail stabilizes post-cranking. Use Value: 3µA quiescent current avoids parasitic drain; 3.9V threshold rejects transients while catching true undervoltage faults. |
| Industrial Edge Controllers | Smart Home Hub Power Sequencing |
Use Scenario: DIN-rail mounted PLC module with dual 5V/3.3V rails and wide ambient temperature range. IC Role / Device Role / Timing Role: Primary reset supervisor for 3.3V core logic; open-drain output interfaces directly to FPGA reset pin with 10kΩ pull-up to 2.5V I/O domain. Use Value: ±2.5% threshold accuracy over -40°C to +125°C eliminates need for derating or margining in harsh environments. | Use Scenario: Voice-controlled home hub with USB-C PD input, multiple DC/DC converters, and standby wake capability. IC Role / Device Role / Timing Role: Resets application processor on 3.3V rail collapse during adapter disconnect or surge events. Use Value: SC70-3 footprint saves space on dense 6-layer board; 1.0V operational lower limit prevents false release during soft-start phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 3.08V reset threshold, 240ms timeout, same SC70-3 package and open-drain output. | Designed for 3.3V systems with longer timeout; not suitable where 3.9V threshold or 20ms timing is required. | Select only if system VCC nominal is ≤3.3V and longer reset hold time is acceptable. |
| TPS3808G33DBVR | 3.3V threshold, 20ms timeout, push-pull active-low output, 1.5µA ICC at 1.8V. | Lower quiescent current but push-pull output lacks wired-OR capability; different pinout (VCC-GND-RESET). | Choose when lowest power is critical and board layout allows re-routing for push-pull interface. |
Compared with MAX809TRD2+T and TPS3808G33DBVR, the MAX6381XR39D2+ uniquely delivers 3.9V threshold accuracy with 20ms timing in SC70-3 - essential for 5V-tolerant or mixed-voltage systems requiring precise brownout detection without layout redesign.
Availability
MAX6381XR39D2+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered telematics, industrial edge controllers, and smart home hub power sequencing requiring stable component supply and long-term manufacturability.
Supply support for MAX6381XR39D2+ 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 computing applications.
The MAX6381–MAX6390 family targets ultra-low-power microprocessor supervision in size- and energy-constrained systems, emphasizing factory-trimmed thresholds, sub-µA operation, and miniature packaging for next-generation portable electronics.
FAQ
What is the exact reset threshold voltage of MAX6381XR39D2+?
The MAX6381XR39D2+ has a factory-set nominal reset threshold of 3.90V, with guaranteed limits of 3.80V (min) and 4.00V (max) at +25°C, and ±2.5% accuracy maintained over -40°C to +125°C. This value is laser-trimmed during production and does not require external components. The '39' suffix in MAX6381XR39D2+ explicitly denotes the 3.9V threshold variant.
Does MAX6381XR39D2+ include a manual reset input (MR)?
No, MAX6381XR39D2+ does not feature a manual reset input. It is a basic single-supply supervisory circuit with only VCC, GND, and open-drain RESET pins. Manual reset capability is present only in MAX6384/MAX6385/MAX6386/MAX6390 variants - confirmed by the Selector Guide and Pin Description tables, which list MR functionality exclusively for those part numbers.
What is the function of the RESET pin on MAX6381XR39D2+?
The RESET pin on MAX6381XR39D2+ is an active-low open-drain output. It pulls low (to GND) when VCC falls below the 3.9V threshold and remains low for ≥20ms after VCC rises above threshold. An external pull-up resistor is mandatory - typically 4.7kΩ to 10kΩ - to establish the high state. This configuration supports wired-OR connections and voltage-level translation between different logic domains.
Can MAX6381XR39D2+ operate reliably at VCC = 1.2V?
Yes, MAX6381XR39D2+ guarantees correct reset output logic state down to VCC = 1.0V, per Absolute Maximum Ratings and Detailed Description sections. At 1.2V, the device fully functions: it monitors VCC, asserts RESET when below 3.9V (though physically impossible at 1.2V), and maintains valid output drive capability. This ensures fail-safe behavior during deep brownout recovery sequences before full rail restoration.
Which package does MAX6381XR39D2+ use, and what are its dimensions?
MAX6381XR39D2+ uses the 3-pin SC70 package (pkg code X3-2), with body dimensions of 1.25mm × 0.85mm × 0.8mm and gull-wing leads. Pin pitch is 0.65mm. This is confirmed in the Ordering Information table and Package Information section, which lists MAX6381XR__D_+T as SC70-3, and the top view diagram shows three terminals labeled RESET, VCC, GND.
MAX6381XR39D2+ 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:
- 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+ FAQ
1.How can I place an order for MAX6381XR39D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR39D2+ 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+ reliable?
The price and inventory of MAX6381XR39D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR39D2+ is usually 5 days.
3.What payment methods are accepted for MAX6381XR39D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR39D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR39D2+?
MAX6381XR39D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR39D2+ 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+?
For technical support, including MAX6381XR39D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR39D2+ requirements.
6.How does Aetrix verify that MAX6381XR39D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6381XR39D2+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6381XR39D2+?
All MAX6381XR39D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR39D2+, 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+ part is unused and in its original packaging.
Return procedure for MAX6381XR39D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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