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Analog Devices Inc./Maxim Integrated MAX6331LUR+T
- Part No.:
- MAX6331LUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6331LUR+T.pdf
- Description:
- IC VREF SHUNT 1.4% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,085
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Product details
Overview
MAX6331LUR+T from Analog Devices is a precision shunt regulator with integrated active-high power-on reset function in a 3-pin SOT23-3 package. It delivers a regulated 5.0V shunt voltage (±1.5% tolerance), asserts RESET high for 140ms after VSHUNT exceeds 4.63V, and operates across -40°C to +85°C. It enables reliable µP supervision in high-voltage microcontroller systems such as smart appliance controllers.
For engineers reviewing the MAX6331LUR+T datasheet, MAX6331LUR+T pinout, MAX6331LUR+T application, or MAX6331LUR+T equivalent, this device serves as a compact, single-component solution for voltage regulation and deterministic reset timing in space-constrained embedded systems requiring stable brownout immunity and minimal external components.
Technical Context
The MAX6331LUR+T integrates a bandgap-referenced shunt regulator and a precision reset generator with internal 140ms timeout timer. Its reset threshold is fixed at 4.63V (±1.5%) with 40ppm/°C tempco, and it guarantees valid RESET output when VSHUNT ≥ 1.2V over full temperature range.
It functions as a two-terminal shunt regulator (SHUNT–GND) while providing a third-terminal push-pull RESET output referenced to GND. The device sinks 100µA–50mA shunt current and drives up to 800µA high-level or 3.2mA low-level load on RESET, with VOL ≤ 0.4V and VOH ≥ 0.8×VSHUNT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VSHUNT Regulation | 5.0V ±1.5% (4.93V–5.07V at +25°C); ensures stable reference for downstream logic and ADCs |
| Reset Threshold (VTH) | 4.63V ±1.5% (4.56V–4.69V at +25°C); triggers reset before µP enters unstable operating region |
| Reset Pulse Width | 140ms nominal (100–200ms); provides sufficient time for µP initialization without external timing components |
| Shunt Current Range | 100µA to 50mA; supports wide load variation while maintaining regulation and reset validity |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded control environments |
| Package | SOT23-3; 2.92mm × 1.3mm footprint enables PCB area reduction vs. discrete regulator + reset IC solutions |
Pinout & Package
MAX6331LUR+T uses a 3-pin SOT23-3 package (package code U3+1, outline 21-0151). Pin 1 is GND, Pin 2 is RESET (active-high push-pull output), and Pin 3 is SHUNT (regulated 5.0V output node).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Common return path for shunt current and RESET output; must be low-impedance to ensure accurate threshold detection |
| 2 - RESET | Active-high reset output | Push-pull driver that goes high 140ms after VSHUNT rises above 4.63V; sinks 3.2mA / sources 800µA |
| 3 - SHUNT | Regulated shunt voltage node | 5.0V ±1.5% output terminal; sinks all excess current from RS to maintain regulation; connects to µP VCC and bypass capacitor CL |
Key Features
| Feature | Design Value |
|---|---|
| Integrated shunt regulator + reset generator | Eliminates need for separate TL431 + reset IC, reducing BOM count and layout complexity in µP power rails |
| 140ms factory-trimmed reset timeout | Guarantees µP reset hold time meets JEDEC JESD76 requirements without external RC network or trimming |
| ±1.5% VSHUNT and VTH tolerance | Enables direct interfacing with 5V-tolerant µP reset inputs without level-shifting or calibration |
| 100µA minimum shunt current | Allows use with high-value RS resistors for ultra-low-quiescent systems (e.g., battery-backed controllers) |
| 3-pin SOT23-3 footprint | Reduces board area by >60% versus SO-8 or SC-70 alternatives while maintaining thermal performance up to 50mA |
Applications
| Smart Appliance Controllers | Industrial µP Power Monitoring |
|---|---|
Use Scenario: Washing machine mainboard supervising 5V rail during AC line fluctuations and motor startup surges. IC Role / Device Role / Timing Role: Shunt regulator maintains stable 5V supply; RESET asserts high only after rail stabilizes above 4.63V for ≥140ms. Use Value: Prevents firmware corruption during brownout recovery and eliminates false resets caused by brief 50Hz dips. | Use Scenario: PLC I/O module monitoring 5V system rail under variable load and ambient temperature shifts. IC Role / Device Role / Timing Role: Provides precision 5.0V reference and deterministic reset assertion independent of input voltage ripple. Use Value: Ensures µP reboots only when VSHUNT is within spec (±1.5%), avoiding premature restarts during transient load steps. |
| Portable Medical Sensors | Intelligent HVAC Thermostats |
Use Scenario: Battery-powered glucose meter with boost converter feeding 5V rail to µP and analog front-end. IC Role / Device Role / Timing Role: Regulates 5V despite battery sag; RESET remains inactive until post-boost stabilization is confirmed. Use Value: Guarantees µP starts only with valid supply-critical for FDA-compliant device boot integrity. | Use Scenario: Wi-Fi-enabled thermostat using 5V rail derived from 24VAC transformer with rectification and filtering. IC Role / Device Role / Timing Role: Compensates for transformer inrush and half-wave dropout; holds RESET high for full 140ms after rail crosses 4.63V. Use Value: Eliminates display flicker and communication loss during HVAC compressor cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-regulator-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6330LUR+T | Active-low RESET output; identical VSHUNT, VTH, and timing specs | Requires µP with active-low reset input; no change to regulator section or RS design | Select when host µP reset pin is active-low and pull-up is not desired |
| TLV7031DTQ | Separate 3.3V LDO + open-drain reset IC; requires external R/C for timeout; ±2% VOUT and VTH | Needs additional pass transistor and timing capacitor; larger footprint and higher BOM cost | Consider only if 3.3V regulation is required and SOT23-3 area constraint is relaxed |
Compared with MAX6330LUR+T, the MAX6331LUR+T provides active-high reset compatibility with modern µPs lacking internal pull-ups, while TLV7031DTQ offers voltage flexibility at the cost of integration, accuracy, and board space.
Availability
MAX6331LUR+T is available at Aetrix Electronics and suitable for smart appliance controllers, industrial µP power monitoring, and portable medical sensors requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term production continuity.
Supply support for MAX6331LUR+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The MAX6330/MAX6331 product line delivers integrated precision shunt regulation and reset functionality for cost-sensitive, space-constrained microprocessor supervisory applications in industrial and consumer systems.
FAQ
What is the exact shunt voltage and reset threshold of MAX6331LUR+T?
The MAX6331LUR+T provides a regulated shunt voltage of 5.0V ±1.5% (4.93V–5.07V at +25°C) and a reset threshold of 4.63V ±1.5% (4.56V–4.69V at +25°C). Both parameters exhibit 40ppm/°C temperature coefficient, ensuring predictable behavior across -40°C to +85°C operation. These values are factory-trimmed and do not require external calibration.
How does the 140ms reset timeout work in MAX6331LUR+T?
The MAX6331LUR+T features an internal timer that begins counting when VSHUNT rises above 4.63V. After exactly 140ms (100–200ms over temperature), the RESET output transitions high and remains high until VSHUNT falls below threshold. No external capacitor or resistor is needed-the timing is fully integrated and factory calibrated, eliminating timing drift due to component tolerances.
Can MAX6331LUR+T drive a µP reset pin directly?
Yes, MAX6331LUR+T can drive most µP reset pins directly: its RESET output is a push-pull driver capable of sourcing 800µA and sinking 3.2mA, with VOH ≥ 0.8×VSHUNT and VOL ≤ 0.4V. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor is recommended to prevent contention-this configuration is validated in the MAX6331LUR+T application circuit.
What is the minimum shunt current required for MAX6331LUR+T to regulate properly?
The MAX6331LUR+T requires a minimum shunt current of 100µA to maintain regulation at the 5.0V shunt voltage. Below this current, the device cannot sustain VSHUNT within specification. This value is specified across -40°C to +85°C and defines the lower bound for RS resistor selection in the application circuit.
Is MAX6331LUR+T compatible with lead-free PCB assembly processes?
Yes, MAX6331LUR+T is supplied in lead-free packaging (RoHS-compliant), indicated by the "+T" suffix. It supports standard Pb-free reflow profiles with peak temperatures up to +260°C and is rated for soldering at +300°C for 10 seconds. The SOT23-3 package has been qualified for IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), requiring no bake prior to assembly.
MAX6331LUR+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50 mA
- Tolerance:
- ±1.4%
- Temperature Coefficient:
- 40ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6331LUR+T FAQ
1.How can I place an order for MAX6331LUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6331LUR+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 MAX6331LUR+T reliable?
The price and inventory of MAX6331LUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6331LUR+T is usually 5 days.
3.What payment methods are accepted for MAX6331LUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6331LUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6331LUR+T?
MAX6331LUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6331LUR+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 MAX6331LUR+T?
For technical support, including MAX6331LUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6331LUR+T requirements.
6.How does Aetrix verify that MAX6331LUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6331LUR+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 MAX6331LUR+T meets industry standards.
7.What is the process for return or replacement of MAX6331LUR+T?
All MAX6331LUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6331LUR+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 MAX6331LUR+T part is unused and in its original packaging.
Return procedure for MAX6331LUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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