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Analog Devices Inc./Maxim Integrated MAX6331SUR-T
- Part No.:
- MAX6331SUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6331SUR-T.pdf
- Description:
- IC VREF SHUNT 1.3% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
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Product details
Overview
MAX6331SUR-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 provides ±1.5% output voltage tolerance (3.3V shunt), 140ms reset timeout, and operates over -40°C to +85°C for microprocessor power monitoring in high-voltage systems. Used in intelligent instruments and portable equipment requiring brownout protection.
For engineers reviewing the MAX6331SUR-T datasheet, MAX6331SUR-T pinout, MAX6331SUR-T application, or MAX6331SUR-T equivalent, this device serves as a compact, single-chip solution for µP supervisory functions where space-constrained designs demand combined regulation and reset timing without external components.
Technical Context
The MAX6331SUR-T integrates a precision shunt reference and an active-high reset generator with internal 140ms timeout timer. Its shunt regulator maintains VSHUNT at 3.3V ±1.5% across 100µA–50mA load current, while the reset circuit asserts RESET high only after VSHUNT exceeds 3.06V and remains stable for ≥140ms.
It features 40ppm/°C temperature coefficient on both VSHUNT and reset threshold, supports continuous short-circuit operation, and delivers RESET output with VOH ≥0.8×VSHUNT (ISOURCE = 800µA) and VOL ≤0.3V (ISINK = 1.2mA). No external capacitor is required for basic reset timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VSHUNT | 3.3V ±1.5% - precisely regulates system supply rail at nominal 3.3V with tight tolerance over temperature and load. |
| Reset Threshold | 3.06V ±1.5% - triggers active-high RESET when shunt voltage rises above this level, enabling reliable µP initialization. |
| Reset Timeout | 140ms - guarantees minimum reset assertion duration after power-up or recovery from brownout, no external RC needed. |
| Shunt Current Range | 100µA to 50mA - accommodates wide load variations while maintaining regulation; enables use with high-input-voltage sources via series resistor. |
| Operating Temp | -40°C to +85°C - qualified for industrial and consumer environments without derating below 70°C. |
| Package | SOT23-3 - ultra-compact 3-pin surface-mount package reducing PCB area vs discrete regulator + reset IC solutions. |
| Reset Output Type | Active-high push/pull - drives µP reset input directly without pull-up; sinks ≤0.3V at 1.2mA, sources ≥0.8×VSHUNT at 800µA. |
Pinout & Package
SOT23-3 package with gull-wing leads, 1.3mm × 2.9mm footprint, 0.95mm height, and thermal resistance ΘJA = 0.25°C/mW when soldered on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Common return path for shunt current and reset logic; must be low-impedance connection to system ground plane. |
| 2 (RESET) | Active-High Reset Output | Push/pull output asserted high after VSHUNT exceeds threshold and remains high for 140ms; compatible with standard µP reset inputs. |
| 3 (SHUNT) | Regulated Shunt Voltage Node | Provides stable 3.3V output; sinks variable current (100µA–50mA) to maintain regulation; connects to series resistor (RS) from VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Shunt Regulator + Reset | Eliminates need for separate voltage reference and reset IC, reducing BOM count and board area in µP-based systems. |
| 140ms Factory-Trimmed Timeout | Guaranteed reset pulse width without external timing components-simplifies design and improves reliability vs RC-based solutions. |
| ±1.5% VSHUNT & Reset Threshold Tolerance | Ensures consistent reset behavior across production units and temperature; avoids marginal startup failures in critical applications. |
| 3-Pin SOT23-3 Footprint | Enables placement in space-constrained portable and size-sensitive equipment; compatible with standard pick-and-place assembly. |
| High Transient Immunity | Resists short-duration negative-going VSHUNT glitches without false resets-reduces need for excessive bypass capacitance. |
Applications
| Intelligent Instruments | Portable Equipment |
|---|---|
Use Scenario: Digital multimeters and handheld analyzers require stable 3.3V supply and guaranteed µP reset during battery insertion or low-battery recovery. IC Role / Device Role / Timing Role: MAX6331SUR-T acts as primary shunt regulator and supervisor-regulating VSHUNT and asserting active-high RESET to initialize MCU upon valid supply. Use Value: Enables single-component power sequencing with 140ms reset hold time, eliminating risk of firmware corruption during marginal battery conditions. | Use Scenario: Wearable health monitors operate from coin-cell or Li-ion sources where input voltage varies widely and board space is extremely limited. IC Role / Device Role / Timing Role: MAX6331SUR-T replaces dual discrete regulators and reset circuits-providing precise 3.3V regulation and deterministic reset timing in 3-pin SOT23-3. Use Value: Reduces total solution size by >50% versus discrete alternatives while maintaining ±1.5% accuracy and industrial temperature range. |
| Household Appliances | Critical µP Power Monitoring |
Use Scenario: Smart thermostats and appliance control boards experience frequent power cycling and line transients during AC mains switching. IC Role / Device Role / Timing Role: MAX6331SUR-T monitors shunt voltage and asserts RESET high only after stable 3.3V is established for ≥140ms-preventing erratic boot sequences. Use Value: Prevents MCU lockup during brownouts caused by compressor or relay switching, improving field reliability without added filtering. | Use Scenario: Industrial PLC I/O modules require fail-safe µP supervision during undervoltage events caused by shared power rails or cable drop. IC Role / Device Role / Timing Role: MAX6331SUR-T serves as dedicated power-good monitor-asserting RESET until VSHUNT reaches 3.06V and remains there for full timeout period. Use Value: Guarantees µP remains held in reset during transient dips below 3.06V, avoiding undefined state entry during rail instability. |
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 |
|---|---|---|---|
| MAX6330SUR-T | Active-low RESET output; identical VSHUNT (3.3V), reset threshold (3.06V), and timing specs. | Requires µP with active-low reset input; not interchangeable without schematic change. | Select MAX6330SUR-T only if target µP accepts active-low reset assertion. |
| TLV809EC26DBZR | Dedicated 2.63V reset IC (no shunt regulator); SOT23-3, 140ms timeout, but lacks voltage regulation capability. | Must pair with external 3.3V regulator; increases component count and board area. | Choose TLV809EC26DBZR only when regulation is already provided elsewhere and only reset supervision is needed. |
Compared with MAX6330SUR-T and TLV809EC26DBZR, the MAX6331SUR-T uniquely combines 3.3V shunt regulation and active-high reset in one die-offering smallest footprint and lowest BOM cost for µP systems lacking dedicated reset inputs or requiring integrated regulation.
Availability
MAX6331SUR-T is available at Aetrix Electronics and suitable for intelligent instruments, portable equipment, and household appliances requiring stable component supply with industrial temperature range and RoHS-compliant packaging.
Supply support for MAX6331SUR-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 shunt regulation and reset supervision for space- and cost-sensitive microprocessor systems operating from high-voltage sources.
FAQ
What is the exact shunt voltage and reset threshold for MAX6331SUR-T?
The MAX6331SUR-T provides a nominal shunt voltage (VSHUNT) of 3.3V with ±1.5% tolerance, and a reset threshold (VTH) of 3.06V ±1.5%. These values are factory-trimmed and specified over -40°C to +85°C ambient temperature, ensuring consistent performance across industrial operating conditions for the MAX6331SUR-T.
Does MAX6331SUR-T require external components to generate its 140ms reset pulse?
No, the MAX6331SUR-T includes an internal timer that guarantees a 140ms reset pulse width after VSHUNT exceeds the threshold-no external capacitor or resistor is needed. This eliminates timing component variation and improves long-term reliability compared to RC-based reset circuits used with other supervisors.
How does the MAX6331SUR-T handle brownout conditions?
When VSHUNT falls below the 3.06V reset threshold due to a brownout, the MAX6331SUR-T immediately pulls RESET low (de-asserts active-high), and the internal timer resets. Once VSHUNT recovers above threshold, RESET remains low for another full 140ms timeout-ensuring the µP stays held until stable supply is fully restored for the MAX6331SUR-T.
Can MAX6331SUR-T be used with microprocessors that have bidirectional reset pins?
Yes, but requires a 4.7kΩ series resistor between the MAX6331SUR-T RESET pin and the µP's bidirectional reset I/O to prevent contention. This isolates the MAX6331SUR-T output from the µP's internal pull-up/down, ensuring clean logic levels during reset assertion and release for the MAX6331SUR-T.
What is the maximum shunt current and power dissipation rating for MAX6331SUR-T?
The MAX6331SUR-T supports up to 50mA shunt current and has a continuous power dissipation limit of 320mW in SOT23-3 at +70°C (derated 4mW/°C above). At maximum shunt current and worst-case ambient, die temperature must remain below +150°C using ΘJA = 0.25°C/mW-verified in the MAX6331SUR-T datasheet.
MAX6331SUR-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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 50 mA
- Tolerance:
- ±1.3%
- 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
MAX6331SUR-T FAQ
1.How can I place an order for MAX6331SUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6331SUR-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 MAX6331SUR-T reliable?
The price and inventory of MAX6331SUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6331SUR-T is usually 5 days.
3.What payment methods are accepted for MAX6331SUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6331SUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6331SUR-T?
MAX6331SUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6331SUR-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 MAX6331SUR-T?
For technical support, including MAX6331SUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6331SUR-T requirements.
6.How does Aetrix verify that MAX6331SUR-T is sourced from the original manufacturer or authorized distributors?
All MAX6331SUR-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 MAX6331SUR-T meets industry standards.
7.What is the process for return or replacement of MAX6331SUR-T?
All MAX6331SUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6331SUR-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 MAX6331SUR-T part is unused and in its original packaging.
Return procedure for MAX6331SUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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