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Analog Devices Inc./Maxim Integrated MAX6381XR46D2-T
- Part No.:
- MAX6381XR46D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR46D2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,191
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Product details
Overview
MAX6381XR46D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set 4.63V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and active-low open-drain reset output. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered microcontroller power-up sequencing.
For engineers reviewing the MAX6381XR46D2-T datasheet, MAX6381XR46D2-T pinout, MAX6381XR46D2-T application, or MAX6381XR46D2-T equivalent, key selection considerations include its precise 4.63V VTH tolerance, 20ms reset hold time, open-drain output requiring external pullup, absence of manual reset input, and compatibility with dual-voltage systems where auxiliary monitoring is not required.
Technical Context
The MAX6381XR46D2-T implements a precision voltage comparator with internal 4.63V reference and hysteresis, triggering reset when VCC falls below threshold and holding it for ≥20ms after recovery. Its open-drain RESET output supports flexible logic-level interfacing across mixed-voltage systems.
No manual reset (MR) or auxiliary RESET IN inputs are integrated - this variant is optimized for single-rail, fixed-threshold supervision without user-initiated or secondary-voltage monitoring capability. Reset assertion is guaranteed functional down to VCC = 1V, enabling robust brownout detection in low-voltage embedded designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (nominal), ±2.5% over -40°C to +125°C - ensures reliable detection of 5V rail collapse with minimal false triggers. |
| Reset Timeout | 20ms (minimum) - provides sufficient hold time for microcontroller core initialization before release. |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors. |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion during deep brownout down to 1V, critical for graceful shutdown. |
| Output Type | Active-low open-drain - requires external pullup; allows wired-OR configuration and level translation to higher logic rails. |
| Package | 3-pin SC70 (X3+2 outline) - ultra-small footprint (1.25mm × 0.85mm) for space-constrained portable PCBs. |
| Temperature Range | -40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
3-pin SC70 package (Outline Number 21-0075, Land Pattern 90-0208), surface-mount, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; must be pulled up externally to define high state; sinks current only when asserted. |
| 2 | VCC | Main supply input; monitored for reset condition; operates from 1.0V to 5.5V. |
| 3 | GND | Analog and digital ground reference; connects to system common return path. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.63V nominal with ±2.5% accuracy over full temperature range - eliminates need for external trimming in 5V-system brownout protection. |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in always-on edge nodes without compromising supervision reliability. |
| Valid reset down to 1V VCC | Guaranteed correct logic state even as supply collapses - prevents premature release during power-down sequences. |
| Open-drain output architecture | Enables shared reset bus across multiple voltage domains and supports I²C-style wired-OR topology. |
| High transient immunity | Rejects negative-going VCC glitches ≤100µs at 100mV overdrive - reduces false resets in electrically noisy environments. |
Applications
| Industrial PLC Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Supervising 5V microcontroller supply during cold-crank battery dip (down to 6V system). IC Role / Device Role / Timing Role: Single-rail reset supervisor asserting active-low signal until VCC recovers above 4.63V and holds for ≥20ms. Use Value: Prevents firmware corruption by ensuring MCU remains held in reset during unstable 5V rail recovery after engine start. | Use Scenario: Monitoring 5V supply to body ECU in ambient temperatures ranging from -40°C to +125°C. IC Role / Device Role / Timing Role: Fixed-threshold voltage monitor with guaranteed operation across full AEC-Q100 Grade 1 range. Use Value: Delivers automotive-grade reliability without calibration or external components - simplifies qualification testing. |
| Portable Medical Sensor Node | Smart Meter Backup Power Switchover |
Use Scenario: Enabling safe boot of ARM Cortex-M0+ MCU powered by Li-SOCl₂ primary cell (nominal 3.6V). IC Role / Device Role / Timing Role: Low-current supervisor asserting reset if VCC drops below 4.63V due to load surge or aging. Use Value: 3μA supply current extends 10-year battery life; 20ms timeout accommodates slow LDO startup. | Use Scenario: Detecting main AC supply failure and initiating switchover to supercapacitor backup in utility meter. IC Role / Device Role / Timing Role: High-accuracy 4.63V threshold detector triggering controlled shutdown sequence upon 5V rail collapse. Use Value: ±2.5% VTH tolerance ensures consistent switchover point across temperature - avoids premature or delayed backup activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR46D2+T | Same 4.63V threshold, 20ms timeout, 3-pin SC70, but push-pull active-low output (no external pullup needed). | Lacks open-drain flexibility; incompatible with wired-OR or level-shifted reset buses. | Select when board layout prohibits external pullup or when driving single-load CMOS reset input directly. |
| TLV809E46DBZR | 4.63V threshold, 200ms min timeout, SOT-23-3, push-pull active-low; higher ICC (0.5μA typ at 3.3V, but no 1.8V spec). | Longer timeout limits use in fast-boot systems; no -40°C to +125°C rating (only -40°C to +125°C for some variants, not guaranteed). | Consider only for commercial-temp, non-battery-critical applications where longer reset hold is acceptable. |
Compared with MAX6326XR46D2+T, the MAX6381XR46D2-T trades push-pull convenience for open-drain interoperability; versus TLV809E46DBZR, it delivers superior temperature coverage, lower 1.8V current, and tighter VTH accuracy - making it the preferred choice for extended-temperature, ultra-low-power, or multi-rail designs.
Availability
MAX6381XR46D2-T is available at Aetrix Electronics and suitable for industrial PLC power sequencing, automotive body control modules, portable medical sensor nodes, and smart meter backup power switchover requiring stable component supply across extended temperature ranges.
Supply support for MAX6381XR46D2-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 and mixed-signal ICs for power, sensing, and interface applications, with emphasis on high-reliability, low-power solutions.
The MAX6381–MAX6390 family delivers single/dual-supply microprocessor supervisors optimized for battery-powered, automotive, and industrial systems demanding guaranteed reset behavior across extreme temperatures and ultra-low ICC.
FAQ
What is the exact reset threshold voltage of the MAX6381XR46D2-T?
The MAX6381XR46D2-T has a factory-set nominal reset threshold of 4.63V, with guaranteed accuracy 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 (suffix "46"), and applies specifically to the MAX6381XR46D2-T - not inferred from adjacent variants.
Does the MAX6381XR46D2-T include a manual reset input (MR)?
No, the MAX6381XR46D2-T does not feature a manual reset input. Per the Selector Guide and Pin Configurations, MR is only present on MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6381XR46D2-T is a dedicated single-supply supervisor with RESET and VCC/GND pins only.
What is the function of the RESET pin on the MAX6381XR46D2-T?
The RESET pin on the MAX6381XR46D2-T is an active-low open-drain output. It pulls low when VCC falls below 4.63V and remains low for ≥20ms after VCC rises above threshold. An external pullup resistor is mandatory to establish the high state - this enables wired-OR configurations and voltage-level translation.
Can the MAX6381XR46D2-T operate reliably at VCC = 1.0V?
Yes, the MAX6381XR46D2-T guarantees correct reset output logic state down to VCC = 1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. This ensures deterministic behavior during deep brownout conditions - a key differentiator from many competing supervisors that fail below 1.5V.
Is the MAX6381XR46D2-T qualified for automotive applications?
The MAX6381XR46D2-T carries the "/V" suffix option (e.g., MAX6381XR46D2/V+T) for AEC-Q100 qualification, but the base part number MAX6381XR46D2-T itself is not automotive-qualified. Its -40°C to +125°C operating range meets automotive ambient requirements, yet formal qualification requires explicit /V marking and associated test documentation.
MAX6381XR46D2-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:
- 4.63V
- 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
MAX6381XR46D2-T FAQ
1.How can I place an order for MAX6381XR46D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR46D2-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 MAX6381XR46D2-T reliable?
The price and inventory of MAX6381XR46D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR46D2-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR46D2-T?
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4.How is shipping managed for MAX6381XR46D2-T?
MAX6381XR46D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR46D2-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 MAX6381XR46D2-T?
For technical support, including MAX6381XR46D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR46D2-T requirements.
6.How does Aetrix verify that MAX6381XR46D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR46D2-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 MAX6381XR46D2-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR46D2-T?
All MAX6381XR46D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR46D2-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 MAX6381XR46D2-T part is unused and in its original packaging.
Return procedure for MAX6381XR46D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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