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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:2,789
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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 delivers ±1.5% output voltage tolerance at 3.3V, supports 100µA–50mA shunt current range, features 140ms reset timeout, and protects microprocessors during power-up, brownout, and power-down events in high-voltage supply systems.
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 board space, transient immunity, and tight voltage regulation are critical in size-constrained embedded systems.
Technical Context
The MAX6331SUR+T integrates a precision bandgap-based shunt regulator and an independent reset generator with internal 140ms timeout timer. Its shunt regulation operates over 100µA–50mA with ±1.5% initial tolerance and 40ppm/°C tempco, while the reset threshold is fixed at 3.06V (±1.5%) with identical tempco.
It uses a push/pull active-high RESET output capable of sourcing 800µA at VOH ≥ 0.8×VSHUNT and sinking 1.2mA at VOL ≤ 0.3V - all referenced to GND and fully specified across –40°C to +85°C. No external components are required for reset timing or basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VSHUNT | 3.3V ±1.5% - precisely regulates system rail; enables stable µP operation from high-VIN sources via external series resistor. |
| Reset Threshold | 3.06V ±1.5% - triggers reset when VSHUNT falls below this level; ensures reliable µP initialization before valid supply voltage is reached. |
| Reset Timeout | 140ms - guarantees minimum reset assertion duration after power-up; eliminates need for external RC timing network. |
| Shunt Current Range | 100µA to 50mA - accommodates wide load variations while maintaining regulation; supports low-quiescent and high-current applications. |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint; reduces PCB area vs discrete solutions and improves thermal reliability in dense layouts. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments; performance validated across full range without derating below 70°C. |
| RESET Output Type | Active-high push/pull - drives µP reset pin directly without pull-up; compatible with standard CMOS input thresholds and bidirectional I/Os (with 4.7kΩ series resistor). |
Pinout & Package
MAX6331SUR+T is housed in a RoHS-compliant 3-pin SOT23-3 package (package code U3+1), with exposed pad not electrically connected. The device uses standard SOT23 land pattern (90-0179) and has 2.92mm × 1.3mm body dimensions and 0.95mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for both shunt regulation and reset logic; must be low-impedance connection to system ground plane. |
| 2 | RESET | Active-high push/pull reset output; asserts high after VSHUNT exceeds 3.06V and remains high for 140ms; sinks 1.2mA max, sources 800µA min. |
| 3 | SHUNT | Regulated output node (3.3V); connects to cathode of external series resistor (RS) and loads; requires local 0.1µF bypass capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated shunt + reset | Eliminates need for separate TL431 + reset IC; reduces BOM count, layout area, and interconnect parasitics in µP power monitoring circuits. |
| 140ms factory-trimmed timeout | Guarantees consistent reset hold time across temperature and voltage; removes variability from external RC networks and simplifies qualification testing. |
| ±1.5% VSHUNT and VTH | Enables accurate power-rail supervision for 3.3V µPs without calibration; meets JEDEC JESD8-12A requirements for reset accuracy. |
| 100µA–50mA shunt range | Supports designs from ultra-low-power sensors (<100µA load) to moderate-current peripherals (e.g., 3.3V I/O banks), using same RS design methodology. |
| High transient immunity | Withstands short-duration negative-going VSHUNT glitches without false reset; allows use in noisy industrial power rails without additional filtering. |
Applications
| Microprocessor Power Supervision | Smart Appliance Control Unit |
|---|---|
Use Scenario: Monitoring 3.3V supply rail of an ARM Cortex-M4 MCU powered from 12V via series resistor in a washing machine control board. IC Role / Device Role / Timing Role: Shunt regulator maintains stable 3.3V for MCU core/I/O; active-high RESET asserts during brownout caused by motor startup surge. Use Value: Prevents MCU lockup or corrupted EEPROM writes during 100ms voltage dips; 140ms timeout ensures full firmware initialization before execution begins. | Use Scenario: Providing regulated 3.3V and supervised reset to a PIC16F18857 in a Wi-Fi-enabled HVAC thermostat with battery backup. IC Role / Device Role / Timing Role: Regulates auxiliary rail from primary DC supply; RESET signal synchronizes microcontroller wake-up after power restoration from deep sleep. Use Value: Enables deterministic boot sequence after AC outage recovery; ±1.5% tolerance ensures compatibility with 3.3V I/O voltage specs across temperature extremes. |
| Portable Medical Sensor Node | Industrial PLC I/O Module |
Use Scenario: Powering and supervising an ultra-low-power MSP430FR5994 in a handheld glucose meter operating from coin cell + boost converter. IC Role / Device Role / Timing Role: Shunt regulator sets precise 3.3V reference; RESET prevents analog front-end sampling during unstable power ramp-up. Use Value: Guarantees clean ADC reference and digital logic state at first clock edge; 100µA minimum shunt current allows operation down to 10µA system quiescent current. | Use Scenario: Supervising 3.3V FPGA configuration rail in a DIN-rail mounted I/O module exposed to 40V transients on 24VDC field bus. IC Role / Device Role / Timing Role: Provides robust shunt regulation and glitch-immune reset despite high-voltage coupling into supply lines. Use Value: Maintains µP/FPGA reset integrity during EFT bursts per IEC 61000-4-4; SOT23-3 footprint enables placement near connector entry point for shortest path. |
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 |
|---|---|---|---|
| TLV70733PDQNR | LDO regulator (not shunt); no integrated reset; requires external supervisor IC. | Requires two devices and more board area; lacks built-in reset timing; lower quiescent current but no high-VIN capability. | Select only if input voltage is <6V and discrete reset generation is acceptable. |
| MAX6326UR33+T | Dedicated 3.3V reset IC (no shunt regulator); requires external 3.3V LDO or shunt. | Separate power and reset functions increase component count; no voltage regulation capability; identical 140ms timeout and ±1.5% threshold. | Choose when existing 3.3V rail is already regulated and only reset supervision is needed. |
Compared with TLV70733PDQNR and MAX6326UR33+T, the MAX6331SUR+T uniquely combines regulation and reset in one SOT23-3 device, enabling single-component solutions for high-input-voltage µP systems - reducing cost, footprint, and design complexity without sacrificing accuracy or timing control.
Availability
MAX6331SUR+T is available at Aetrix Electronics and suitable for microprocessor power supervision, smart appliance control units, portable medical sensor nodes, and industrial PLC I/O modules requiring stable component supply and long-term industrial lifecycle support.
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, serving industrial, automotive, communications, and healthcare markets.
The MAX6330/MAX6331 product line delivers integrated shunt regulation and reset functionality for space-constrained, high-voltage µP systems - designed specifically to replace multi-component solutions in cost-sensitive, reliability-critical embedded applications.
FAQ
What is the exact shunt voltage and reset threshold for MAX6331SUR+T?
The MAX6331SUR+T provides a nominal shunt voltage of 3.3V with ±1.5% tolerance (3.25V to 3.35V at +25°C) and a reset threshold of 3.06V ±1.5% (3.01V to 3.11V at +25°C). Both parameters track with temperature at 40ppm/°C and are guaranteed across –40°C to +85°C. These values are confirmed in the device's ordering suffix 'T' and electrical characteristics table.
How does the MAX6331SUR+T differ from the MAX6330SUR+T?
The MAX6331SUR+T features an active-high RESET output, while the MAX6330SUR+T provides active-low RESET. Both share identical shunt voltage (3.3V), reset threshold (3.06V), 140ms timeout, and SOT23-3 package. The MAX6331SUR+T is selected when interfacing with µPs that require high-valid reset assertion, such as many ARM and PIC devices with active-high reset inputs.
Can MAX6331SUR+T operate directly from a 48V supply?
Yes - the MAX6331SUR+T is designed for high-input-voltage systems. With proper selection of the external series resistor RS, it regulates 3.3V from up to 50V input. For example, with ILOAD = 10mA and ISHUNT = 5mA, RS ≈ 8.4kΩ (1% tolerance, 0.25W) safely limits power dissipation while maintaining regulation across temperature and load variation.
What is the minimum bypass capacitor required for stable operation of MAX6331SUR+T?
The minimum recommended bypass capacitor (CL) on the SHUNT pin is 0.03µF to ensure stability across the full 100µA–50mA shunt current range. A 0.1µF X7R ceramic capacitor placed within 2mm of the SHUNT and GND pins is the typical recommendation per the datasheet, providing optimal trade-off between transient response and overshoot suppression.
Does MAX6331SUR+T support bidirectional µP reset pins like those on Motorola 68HC11?
Yes - the MAX6331SUR+T can interface with bidirectional reset pins using a 4.7kΩ series resistor between its RESET output and the µP reset I/O. This prevents contention when the µP attempts to drive the line low while MAX6331SUR+T asserts high. The resistor value is specified in Analog Devices' application note and validated in Figure 6 of the MAX6330/MAX6331 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.
MAX6331SUR+T Tags
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