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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 MPU/RESET CIRC 4.60V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,313
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Product details
Overview
MAX6381XR46D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring a factory-set 4.63V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors single supply voltage (1.0V–5.5V) and guarantees valid reset state down to VCC = 1V, used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR46D2+T datasheet, MAX6381XR46D2+T pinout, MAX6381XR46D2+T application, or MAX6381XR46D2+T equivalent, key selection considerations include its 4.63V threshold accuracy, 20ms timeout timing, open-drain output drive capability (3.2mA sink at 4.5V), ultra-low 3μA supply current at 1.8V, and automotive-grade AEC-Q100 qualification (indicated by /V suffix in related variants).
Technical Context
The MAX6381XR46D2+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco, paired with a monolithic RC timer for deterministic 20ms reset assertion after VCC recovery. Its open-drain RESET output requires an external pullup and remains valid down to VCC = 1V, enabling robust reset signaling even during deep brownout conditions.
No manual reset (MR) input or auxiliary RESET IN functionality is present - this variant belongs to the base MAX6381 series, which supports only VCC monitoring and lacks debounced MR or dual-voltage detection features found in MAX6384–MAX6390 derivatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (min 4.51V, max 4.74V); ensures reliable reset assertion before 5V system brownout. |
| Reset Timeout | 20ms minimum; holds μP in reset long enough for stable clock and supply settling post-power-up. | 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 signaling down to near-dead-battery conditions. |
| Output Type | Active-low open-drain; allows wired-OR configuration and level translation with external pullup. |
| Temp Range | -40°C to +125°C; qualified for under-hood automotive and industrial control environments. |
| Threshold Accuracy | ±2.5% over full temperature range; eliminates need for external calibration in harsh thermal environments. |
Pinout & Package
Package: 3-pin SC70 (outline 21-0075, land pattern 90-0208), footprint-compatible with industry-standard low-pin-count supervisory ICs.
| 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; sinks 3.2mA at 4.5V. |
| 2 | VCC | Main supply input and monitored voltage source; accepts 1.0V–5.5V; powers internal comparator and timer. |
| 3 | GND | Analog/digital ground reference; connects to system common return path for accurate threshold sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V threshold | Eliminates external resistor divider; reduces BOM count and layout area in 5V systems. |
| 20ms guaranteed reset timeout | Ensures sufficient hold time for 5V microcontrollers with slow crystal startup or PLL lock times. |
| 3μA supply current at 1.8V | Extends battery life in portable medical devices and wireless sensor nodes beyond 10 years. |
| Open-drain RESET with 1.0μA leakage | Enables flexible voltage-level interfacing and multi-drop reset bus architectures. |
| AEC-Q100 qualified variant available | Supports automotive applications including body control modules and ADAS power management. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Monitoring 5V auxiliary supply in programmable logic controller backplane slots subject to load switching transients. IC Role / Device Role / Timing Role: Single-supply voltage supervisor asserting active-low reset to ARM Cortex-M7 MCU during 5V rail dips below 4.63V. Use Value: Prevents firmware corruption during hot-swap events with deterministic 20ms reset hold time and ±2.5% threshold stability over -40°C to +125°C. | Use Scenario: Power-on reset generation for LIN transceiver and microcontroller in door module electronics. IC Role / Device Role / Timing Role: Supervises 5V domain (VCC) and asserts open-drain RESET to wake up MCU only after stable 5V rail is confirmed. Use Value: Enables AEC-Q100-compliant reset behavior with 4.63V threshold matching typical 5V regulator tolerance, reducing validation effort. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Battery-backed reset supervision in glucose monitor using CR2032 coin cell with aging-induced voltage droop. IC Role / Device Role / Timing Role: Monitors declining 3.0V rail and triggers reset before MCU executes invalid instructions due to marginal supply. Use Value: Ultra-low 3μA quiescent current extends operational lifetime; 1.0V minimum VCC operation ensures reset validity until battery depletion. | Use Scenario: Reset coordination between metrology ASIC and host MCU during AC mains interruption and capacitor hold-up decay. IC Role / Device Role / Timing Role: Detects 5V DC supply collapse from backup capacitor and asserts 20ms reset pulse to synchronize recovery sequence. Use Value: Tight 4.63V threshold prevents premature reset during brief line sags; open-drain output interfaces cleanly with isolated reset domains. |
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, and SC70 package; push-pull active-low output instead of open-drain. | Requires no external pullup; unsuitable for wired-OR or level-shifted reset buses. | Select when board space prohibits pullup resistor or when driving CMOS inputs directly. |
| TLV803EB46DBZR | 4.63V threshold, 20ms timeout, SOT-23-3 package; higher 8μA ICC at 1.8V and ±3% threshold accuracy. | Lacks AEC-Q100 qualification; not recommended for automotive deployments. | Choose for cost-sensitive consumer applications where extended temperature range is not required. |
Compared with MAX6381XR46D2+T, MAX6326XR46D2+T offers simpler interface but less system flexibility, while TLV803EB46DBZR trades accuracy and qualification for lower unit cost - making MAX6381XR46D2+T optimal for high-reliability 5V industrial and automotive edge nodes.
Availability
MAX6381XR46D2+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensors, and smart energy meters requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
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 demanding industrial, automotive, and communications applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems operating across wide voltage and temperature ranges - specifically engineered for battery longevity and functional safety in mission-critical embedded control.
FAQ
What is the exact reset threshold voltage of the MAX6381XR46D2+T and how stable is it over temperature?
The MAX6381XR46D2+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 range of -40°C to +125°C, the threshold remains within ±2.5% of nominal (i.e., 4.51V to 4.74V), supported by a 60ppm/°C tempco. This stability is confirmed in the Electrical Characteristics table and Typical Operating Characteristics plots on page 4 of the datasheet.
Does the MAX6381XR46D2+T include a manual reset (MR) input?
No, the MAX6381XR46D2+T does not include a manual reset input. It belongs to the base MAX6381 series, which supports only VCC monitoring and open-drain reset output. Manual reset functionality is available only in MAX6384–MAX6390 variants (e.g., MAX6384XR46D2+T), as clearly indicated in the Selector Guide and Pin Configurations section of the datasheet.
What is the minimum supply voltage at which the MAX6381XR46D2+T guarantees correct reset output behavior?
The MAX6381XR46D2+T guarantees valid reset output logic state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the device may not assert or deassert reset reliably. This feature ensures fail-safe reset signaling during deep brownout conditions common in battery-powered systems.
Can the MAX6381XR46D2+T be used in automotive applications?
Yes - while the MAX6381XR46D2+T itself carries the RoHS-compliant "+T" suffix, automotive-grade qualification (AEC-Q100) is available in /V-suffixed variants such as MAX6381XR46D2/V+T. The core electrical specifications, thermal performance (-40°C to +125°C), and package construction are identical; only the test flow and certification documentation differ. Designers targeting automotive use should specify the /V version.
What package type and pin count does the MAX6381XR46D2+T use, and is it compatible with standard pick-and-place equipment?
The MAX6381XR46D2+T uses a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm. Its gull-wing leads and JEDEC-standard footprint ensure full compatibility with automated SMT assembly lines, including standard vision-guided placement and reflow soldering profiles per J-STD-020.
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:
- 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:
- 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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