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Analog Devices Inc./Maxim Integrated MAX6381XR46D2+
- Part No.:
- MAX6381XR46D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR46D2+.pdf
- Description:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:13,522
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Product details
Overview
MAX6381XR46D2+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.63V reset threshold, 20ms minimum reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors single-supply systems in portable electronics, battery-powered instrumentation, and industrial controllers where precise brownout detection and ultra-low quiescent current (3µA at 1.8V) are critical.
For engineers reviewing the MAX6381XR46D2+ datasheet, MAX6381XR46D2+ pinout, MAX6381XR46D2+ application, or MAX6381XR46D2+ equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), negative-going VCC transient immunity, SC70-3 package compatibility, and valid reset assertion at VCC ≥ 1V without external biasing.
Technical Context
The MAX6381XR46D2+ implements a precision bandgap-based voltage comparator with ±2.5% threshold tolerance across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 20ms minimum reset timeout after VCC rises above 4.63V, with power-down reset delay under 35µs for fast response to supply collapse.
No manual reset (MR) or auxiliary RESET IN inputs are present - this variant is optimized for single-supply monitoring only. The open-drain RESET output requires an external pull-up resistor and sinks up to 3.2mA at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (±2.5% over –40°C to +125°C); ensures reliable brownout detection for 5V logic rails |
| Reset Timeout | 20ms minimum; guarantees µP reset hold time sufficient for full power stabilization |
| 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 valid reset assertion even during deep brownout (down to 1V) |
| Output Type | Active-low open-drain; allows wired-OR configuration and level translation via external pull-up |
| Temp Range | –40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| VCC Transient Immunity | Rejects negative-going glitches < 35µs at 100mV overdrive; prevents false resets in noisy power systems |
Pinout & Package
MAX6381XR46D2+ uses the 3-pin SC70-3 package (package code X3-2), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads. Pin 1 = VCC, Pin 2 = RESET (open-drain), Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and monitored voltage rail; powers internal circuitry and sets reset threshold reference |
| 2 | RESET | Active-low open-drain output; requires external pull-up; asserts low during VCC < 4.63V or power instability |
| 3 | GND | Analog/digital ground reference; must be low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.63V with ±2.5% accuracy over full temperature range eliminates external resistor divider calibration |
| Ultra-low supply current | 3µA at 1.8V enables integration into energy-harvesting and coin-cell-powered devices |
| Valid reset at low VCC | Guaranteed correct logic state down to VCC = 1.0V ensures robust operation during deep brownout recovery |
| Negative transient rejection | Immune to VCC glitches < 35µs duration prevents spurious resets in electrically noisy environments |
| SC70-3 footprint | 2.0mm × 2.1mm package saves PCB area in space-constrained portable and wearable designs |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG monitoring using coin-cell power with strict low-power budget. IC Role / Device Role / Timing Role: Supervises 3.3V supply rail and triggers hard reset if voltage sags below 4.63V during RF transmission bursts. Use Value: 3µA quiescent current extends battery life beyond 5 years; 20ms timeout ensures MCU completes flash write before reset release. | Use Scenario: Environmental sensor node logging temperature/humidity every 10 minutes on AA batteries. IC Role / Device Role / Timing Role: Monitors 5V DC-DC output feeding MCU and radio; asserts open-drain RESET to halt operation during brownout. Use Value: ±2.5% threshold accuracy prevents premature resets during normal battery discharge curve; SC70-3 footprint minimizes board area. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted controller operating in unregulated 24V supply environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Detects undervoltage on 5V local regulator feeding FPGA configuration logic. Use Value: –40°C to +125°C rating ensures reliability in hot enclosures; 4.63V threshold matches TTL-compatible reset requirements. | Use Scenario: Under-dash lighting control module exposed to automotive load dump and cold-cranking transients. IC Role / Device Role / Timing Role: Provides fail-safe reset to microcontroller when 5V supply dips below 4.63V during cranking. Use Value: 35µs power-down delay rejects sub-50µs cranking transients; open-drain output interfaces directly with 12V-tolerant MCU reset pins via pull-up. |
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 | 4.63V threshold, 240ms timeout, push-pull active-low output, SC70-3 package | Longer timeout unsuitable for fast-recovery systems; no open-drain flexibility | Select when push-pull drive is required and longer reset hold time is acceptable |
| TPS3808G33DBVR | 3.3V threshold (not 4.63V), 20ms timeout, open-drain active-low, SOT-23-5 package | Different threshold invalidates direct substitution in 5V systems; larger 5-pin footprint | Select only if redesigning for 3.3V supply monitoring and board layout permits SOT-23-5 |
Compared with MAX809TRD2+T and TPS3808G33DBVR, the MAX6381XR46D2+ uniquely combines 4.63V precision threshold, 20ms timing, open-drain output, and SC70-3 size - enabling drop-in replacement in space-constrained 5V brownout protection circuits without layout change or timeout compromise.
Availability
MAX6381XR46D2+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial PLC I/O modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6381XR46D2+ 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 battery-operated and thermally harsh systems - prioritizing threshold stability, transient immunity, and minimal board footprint.
FAQ
What is the exact reset threshold voltage of the MAX6381XR46D2+?
The MAX6381XR46D2+ has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "46" corresponds to VTH(nom) = 4.63V. The MAX6381XR46D2+ does not support adjustable thresholds - it is a fixed-threshold device.
Does the MAX6381XR46D2+ include a manual reset input (MR)?
No, the MAX6381XR46D2+ does not feature a manual reset input. Per the Selector Guide and Pin Description sections, MR is only present on MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6381XR46D2+ is a 3-pin SC70 device with VCC, RESET, and GND only - it provides dedicated single-supply monitoring without user-initiated reset capability.
What is the function of the RESET pin on the MAX6381XR46D2+?
The RESET pin on the MAX6381XR46D2+ is an active-low open-drain output. It pulls low when VCC falls below 4.63V and remains low for a minimum of 20ms after VCC rises above the threshold. An external pull-up resistor is mandatory. This configuration allows level shifting, wired-OR connections, and compatibility with diverse MCU reset input architectures - a key design feature of the MAX6381XR46D2+.
Can the MAX6381XR46D2+ operate reliably at VCC = 1.2V?
Yes, the MAX6381XR46D2+ guarantees correct RESET output logic state down to VCC = 1.0V, as explicitly stated in the Electrical Characteristics table and Detailed Description section. At VCC = 1.2V, the device remains fully functional: the reset comparator operates, the 20ms timeout timer runs, and the open-drain output maintains valid VOL ≤ 0.3V when asserted. This capability is intrinsic to the MAX6381XR46D2+ design and verified across temperature.
Is the MAX6381XR46D2+ pin-compatible with the MAX809 series?
Yes, the MAX6381XR46D2+ is pin-compatible with MAX809/MAX810 in the SC70-3 package per the "Pin Compatible with" statement in the Features section. Both use identical 3-pin SC70 pinout: Pin 1 = VCC, Pin 2 = RESET, Pin 3 = GND. However, note that MAX809 variants typically offer different timeout periods (e.g., 240ms) and push-pull outputs - the MAX6381XR46D2+ differs in output type and timing, so electrical interface validation is required despite mechanical compatibility.
MAX6381XR46D2+ 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:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR46D2+ FAQ
1.How can I place an order for MAX6381XR46D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR46D2+ 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 MAX6381XR46D2+ reliable?
The price and inventory of MAX6381XR46D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR46D2+ is usually 5 days.
3.What payment methods are accepted for MAX6381XR46D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR46D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR46D2+?
MAX6381XR46D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR46D2+ 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 MAX6381XR46D2+?
For technical support, including MAX6381XR46D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR46D2+ requirements.
6.How does Aetrix verify that MAX6381XR46D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6381XR46D2+ 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 MAX6381XR46D2+ meets industry standards.
7.What is the process for return or replacement of MAX6381XR46D2+?
All MAX6381XR46D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR46D2+, 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 MAX6381XR46D2+ part is unused and in its original packaging.
Return procedure for MAX6381XR46D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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