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Analog Devices Inc./Maxim Integrated MAX6381XR46D3+T
- Part No.:
- MAX6381XR46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR46D3+T.pdf
- Description:
- IC MPU/RESET CIRC 4.63V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
MAX6381XR46D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 4.63V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors single-supply systems in battery-powered instrumentation and embedded controllers where precise brownout detection and ultra-low quiescent current (3μA at 1.8V) are critical.
For engineers reviewing the MAX6381XR46D3+T datasheet, MAX6381XR46D3+T pinout, MAX6381XR46D3+T application, or MAX6381XR46D3+T equivalent, key selection criteria include reset threshold accuracy, timeout timing tolerance, open-drain drive capability with external pullup, VCC operating range (1.0V–5.5V), and automotive-grade AEC-Q100 qualification status.
Technical Context
The MAX6381XR46D3+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms (min) reset assertion period after VCC recovers above 4.63V.
As a single-supply supervisor without manual reset (MR) or auxiliary RESET IN inputs, it delivers deterministic reset behavior solely on VCC monitoring - eliminating external components while maintaining immunity to sub-100µs negative-going VCC transients per test data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (4.51V min / 4.74V max), factory-trimmed for stable brownout detection at 5V systems |
| Reset Timeout | 140ms minimum - ensures μP initialization completes before code execution resumes |
| Supply Current | 3μA at 1.8V - enables multi-year battery life in portable equipment |
| Operating Voltage | 1.0V to 5.5V - guarantees valid reset state even during deep brownout |
| Output Type | Active-low open-drain - requires external pullup; supports wired-OR and mixed-voltage interfacing |
| Temp Range | -40°C to +125°C - qualified for under-hood automotive and industrial environments |
| Threshold Accuracy | ±2.5% over full temperature range - eliminates need for system-level calibration |
Pinout & Package
Package: 3-pin SC70 (outline 21-0075, land pattern 90-0208), footprint-compatible with industry-standard low-pin-count supervisors.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks up to 3.2mA at VCC ≥ 4.5V; requires external pullup resistor |
| 2 | VCC | Main supply input and monitored voltage rail; accepts 1.0V–5.5V; powers internal comparator and timer |
| 3 | GND | Analog/digital ground reference; must be connected directly to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.63V threshold | Eliminates external resistor divider; reduces BOM count and layout area in 5V systems |
| 140ms reset timeout | Matches typical μP power-up stabilization time; prevents premature release of reset signal |
| 3μA supply current at 1.8V | Enables use in always-on sensor nodes and energy-harvesting applications |
| Open-drain output | Allows level-shifting across voltage domains and shared reset bus configurations |
| AEC-Q100 qualified | Validated for automotive electronics requiring reliability under thermal cycling and vibration stress |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Monitoring 5V logic supply in programmable logic controller I/O expansion modules exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Single-rail supervisor asserting active-low reset to ARM Cortex-M microcontroller during brownout events. Use Value: 4.63V threshold aligns precisely with 5V system margin; 140ms timeout exceeds μP boot ROM execution time; ±2.5% accuracy avoids false resets in high-temp enclosures. | Use Scenario: Power-on reset generation for CAN transceiver and microcontroller in door module ECUs. IC Role / Device Role / Timing Role: Primary VCC monitor ensuring deterministic startup after battery reconnection or ignition cycle. Use Value: AEC-Q100 qualification confirms reliability across -40°C to +125°C; 3μA quiescent current minimizes parasitic drain on vehicle battery during sleep mode. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Supervising coin-cell–powered glucose meter MCU during cold-weather operation. IC Role / Device Role / Timing Role: Brownout detector guaranteeing safe shutdown when 3.3V rail drops below 4.63V due to battery depletion. Use Value: Valid operation down to VCC = 1.0V ensures reset remains asserted until power fully collapses; open-drain output interfaces cleanly with MCU's 1.8V I/O domain. | Use Scenario: Reset coordination between metrology ASIC and host processor in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: System-level power supervisor triggering synchronized reset across dual-voltage subsystems. Use Value: 4.63V threshold provides 370mV headroom above nominal 5V rail; 140ms timeout accommodates slow-start LDOs feeding analog front-end circuits. |
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 3-pin SC70 package; 4.63V threshold; but push-pull active-low output (no external pullup required) | Lacks AEC-Q100 qualification; rated only to +85°C ambient | Select when board space is constrained and system uses dedicated reset net without wired-OR requirements |
| TPS3808G33DBVR | 4.63V threshold; 140ms timeout; push-pull active-low; 1.8V–6.5V VCC range | Higher 8μA ICC at 1.8V; no AEC-Q100 rating; different pinout (SOT-23-5) | Choose for broader input voltage support and tighter 0.5% threshold tolerance, accepting higher quiescent current |
Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6381XR46D3+T uniquely combines automotive qualification, ultra-low 3μA supply current, and open-drain flexibility - making it optimal for battery-sensitive, safety-critical, or multi-drop reset architectures.
Availability
MAX6381XR46D3+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensors, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6381XR46D3+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 designs precision analog and mixed-signal ICs for power, sensing, connectivity, and security applications, serving industrial, automotive, and computing markets.
The MAX6381–MAX6390 family delivers low-power, high-accuracy reset supervision for microprocessor-based systems where reliability under voltage fault conditions is non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6381XR46D3+T and how tightly is it specified?
The MAX6381XR46D3+T has a nominal reset threshold of 4.63V, with guaranteed limits of 4.51V (min) and 4.74V (max) at +25°C. Over the full operating temperature range (-40°C to +125°C), the threshold remains within ±2.5% of 4.63V - meaning 4.51V to 4.74V tolerance holds across all temperatures. This specification is confirmed in the Electrical Characteristics table of the official datasheet.
Does the MAX6381XR46D3+T include a manual reset input (MR) or auxiliary RESET IN pin?
No, the MAX6381XR46D3+T does not include a manual reset input (MR) or auxiliary RESET IN pin. It is a single-supply, VCC-only monitoring device in the MAX6381 series variant. MR is present only on MAX6384/MAX6385/MAX6386/MAX6390, and RESET IN appears exclusively on MAX6387/MAX6388/MAX6389 - both features are absent in the MAX6381XR46D3+T pinout and functional description.
What is the reset timeout duration for the MAX6381XR46D3+T and is it guaranteed minimum or typical?
The MAX6381XR46D3+T provides a guaranteed minimum reset timeout of 140ms after VCC rises above the 4.63V threshold. Per the datasheet's Reset Timeout Period table, suffix "D3" corresponds to tRP = 140ms (min), with no upper limit specified - ensuring the reset signal stays asserted for at least that duration, critical for reliable microprocessor initialization.
Can the MAX6381XR46D3+T operate reliably at VCC = 1.0V, and what happens to the reset output at that voltage?
Yes, the MAX6381XR46D3+T is guaranteed to operate correctly down to VCC = 1.0V, and its reset output state remains valid and deterministic at that level. The datasheet explicitly states "Reset Output State Guaranteed Valid Down to VCC = 1V", meaning the open-drain RESET pin will correctly assert low when VCC falls below 4.63V - even as supply voltage collapses toward 1.0V.
Is the MAX6381XR46D3+T RoHS-compliant and qualified for automotive applications?
Yes, the "+T" suffix indicates a lead(Pb)-free/RoHS-compliant package. While the base MAX6381XR46D3+T is not automotive-qualified, the datasheet confirms AEC-Q100 qualification applies to /V-trim versions (e.g., MAX6381XR46D3/V+T). For automotive use, specify the /V variant - the MAX6381XR46D3+T itself meets RoHS but lacks formal AEC-Q100 certification.
MAX6381XR46D3+T 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6381XR46D3+T FAQ
1.How can I place an order for MAX6381XR46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR46D3+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 MAX6381XR46D3+T reliable?
The price and inventory of MAX6381XR46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR46D3+T?
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4.How is shipping managed for MAX6381XR46D3+T?
MAX6381XR46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR46D3+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 MAX6381XR46D3+T?
For technical support, including MAX6381XR46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR46D3+T requirements.
6.How does Aetrix verify that MAX6381XR46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR46D3+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 MAX6381XR46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR46D3+T?
All MAX6381XR46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR46D3+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 MAX6381XR46D3+T part is unused and in its original packaging.
Return procedure for MAX6381XR46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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