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Analog Devices Inc./Maxim Integrated MAX6327UR31+T
- Part No.:
- MAX6327UR31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6327UR31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:858
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Product details
Overview
MAX6327UR31+T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage drops below 3.08V, maintaining reset for ≥100ms after recovery; it operates from 1.2V to 5.5V over -40°C to +85°C and draws ≤1µA supply current, enabling reliable power-on reset in portable 3.3V systems.
For engineers reviewing the MAX6327UR31+T datasheet, MAX6327UR31+T pinout, MAX6327UR31+T application, or MAX6327UR31+T equivalent, this device delivers precision 3.08V threshold detection with ±2.5% temperature stability, ultra-low quiescent current, and SOT23-3 compatibility for space-constrained embedded controllers and battery-powered instrumentation.
Technical Context
The MAX6327UR31+T uses a factory-trimmed bandgap-based voltage comparator with 6.3mV hysteresis to detect VCC deviations against its 3.08V nominal reset threshold. Its active-high push-pull output drives high (≥0.8·VCC) during reset assertion and low (≤0.4V at 3.2mA sink) otherwise, eliminating external pull-up components.
Designed for brownout immunity, it ignores transients <20µs at VTH–VCC = 100mV and supports full operation down to VCC = 1.2V. The reset timeout is guaranteed ≥100ms across temperature, with supply current stable at ≤1.0µA (typical 0.5µA at 3V) from -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±2.5% over -40°C to +85°C - ensures accurate 3.3V system brownout detection without calibration |
| Supply Current | ≤1.0µA max at VCC = 5.5V - enables multi-year battery life in always-on portable devices |
| Reset Timeout | 100ms minimum after VCC rise - meets µP power-on reset timing requirements per JEDEC JESD84 |
| Operating Voltage | 1.2V to 5.5V - supports operation during deep brownout and compatibility with 1.8V–5V logic domains |
| Output Type | Active-high push-pull - drives reset line directly without external pull-up, reducing BOM count and layout area |
| Temperature Range | -40°C to +85°C - qualified for industrial and extended commercial environments |
| Hysteresis | 6.3mV - prevents chatter during slow VCC recovery near threshold |
Pinout & Package
MAX6327UR31+T is housed in a 3-pin SOT23-3 package (outline 21-0051), with 1.3mm × 2.9mm footprint and 0.95mm height, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be connected to system ground plane |
| 2 (RESET) | Active-high push-pull output | Drives high (≥0.8·VCC) when VCC < 3.08V or during timeout; sinks to ≤0.4V when deasserted - directly interfaces µP reset input |
| 3 (VCC) | Supply input | Power source for internal circuitry; accepts 1.2V–5.5V; includes transient filtering to reject <20µs glitches |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max ensures >10-year battery life in coin-cell-powered IoT sensors |
| Precision 3.08V threshold | Factory-trimmed to ±2.5% over temperature eliminates need for external resistor dividers |
| 100ms min reset timeout | Guaranteed delay satisfies ARM Cortex-M and PIC MCU power-on reset timing specifications |
| Push-pull RESET output | Removes dependency on external pull-up resistors, saving board space and reducing EMI susceptibility |
| VCC transient immunity | Rejects negative-going glitches <20µs at 100mV overdrive - prevents false resets during switching noise |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power sequencing in DIN-rail mounted programmable logic controllers where main 3.3V rail may sag during relay switching. IC Role / Device Role / Timing Role: Supervises 3.3V VCC and asserts active-high RESET to hold CPU in reset until stable, with 100ms timeout ensuring firmware integrity. Use Value: Prevents corrupted register writes during brownout by guaranteeing reset remains asserted until VCC exceeds 3.08V and stabilizes for ≥100ms. |
Use Scenario: Battery-backed ECG front-end module requiring fail-safe startup after cold boot or low-battery recovery. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and triggers active-high reset to initialize ADC, op-amps, and BLE radio upon valid supply. Use Value: Enables reliable first-power initialization using only 1µA quiescent current, extending single-CR2032 battery life beyond 3 years. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: Dual-supply meter IC powered from both mains-derived 3.3V and backup supercapacitor, requiring deterministic reset on either source failure. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V domain; asserts RESET if either supply dips below 3.08V, with hysteresis preventing oscillation during capacitor discharge. Use Value: Maintains data coherency in flash memory during grid dropout by holding microcontroller in reset until stable 3.3V is restored. |
Use Scenario: Low-voltage monitoring in 12V automotive subsystems regulated to 3.3V via DC/DC converter subject to load dump transients. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V rail caused by alternator failure or battery disconnect, asserting RESET to halt CAN communication and prevent EEPROM corruption. Use Value: Provides AEC-Q100–compatible supervision (via -40°C to +85°C rating) without external components, reducing BOM cost and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR31+T | Active-low push-pull output; identical threshold (3.08V), supply current, and package | Requires inverted reset logic on µP side; not compatible with active-high-only reset inputs | Select when host processor accepts active-low reset assertion and no level-shifting is desired |
| TLV803EB31DBVR | Active-high open-drain output; 3.08V threshold; 0.5µA typical ICC; same SOT23-3 package | Requires external pull-up resistor; lower drive strength limits bus loading capability | Choose for ultra-low-current designs where open-drain flexibility (e.g., wired-OR reset buses) outweighs added component count |
Compared with MAX6327UR31+T, MAX6326UR31+T provides identical supervision accuracy and power efficiency but requires µP-level logic inversion, while TLV803EB31DBVR trades push-pull drive for sub-µA current and open-drain versatility-making MAX6327UR31+T optimal for direct active-high interface with minimal external parts.
Availability
MAX6327UR31+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6327UR31+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 industrial, computing, and communications applications, with emphasis on reliability, integration, and low-power operation.
The MAX6326/MAX6327/MAX6328 family was developed specifically for microprocessor reset supervision in space- and power-constrained systems, delivering factory-trimmed thresholds, ultra-low ICC, and robust transient immunity in minimal 3-pin packages.
FAQ
What is the exact reset threshold voltage of MAX6327UR31+T and how stable is it over temperature?
The MAX6327UR31+T has a nominal reset threshold of 3.08V, factory-trimmed with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in ≤15mV total drift across temperature - sufficient for precise 3.3V system supervision without recalibration.
Does MAX6327UR31+T require any external components to function?
No, MAX6327UR31+T operates autonomously with only VCC, GND, and RESET connections. Its active-high push-pull output eliminates the need for an external pull-up resistor, and internal hysteresis and transient filtering remove requirements for external capacitors or RC networks - reducing BOM count and PCB area.
Can MAX6327UR31+T be used in 1.8V or 2.5V systems?
Yes, MAX6327UR31+T functions down to VCC = 1.2V and is specified over 1.2V–5.5V, making it suitable for 1.8V and 2.5V systems. However, its 3.08V reset threshold means it will assert reset continuously in those rails unless used with a resistor divider - for native 1.8V/2.5V supervision, select MAX6327UR18+T or MAX6327UR25+T instead.
How does the reset timeout behavior work in MAX6327UR31+T during power-up?
Upon power-up, MAX6327UR31+T holds RESET high for a minimum of 100ms after VCC rises above 3.08V, regardless of subsequent VCC fluctuations within that window. This guarantees the microprocessor receives a clean, extended reset pulse meeting JEDEC and ARM power-on timing requirements before executing code.
Is MAX6327UR31+T pin-compatible with legacy Maxim reset supervisors like MAX809?
Yes, MAX6327UR31+T is pin-compatible with MAX809 (SOT23-3), sharing identical pinout (VCC, RESET, GND), voltage ranges, and active-high push-pull output behavior. It offers improved specs including lower ICC (1µA vs. 20µA), tighter threshold accuracy (±2.5% vs. ±3%), and enhanced transient immunity - enabling drop-in replacement in existing designs.
MAX6327UR31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6327UR31+T FAQ
1.How can I place an order for MAX6327UR31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6327UR31+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 MAX6327UR31+T reliable?
The price and inventory of MAX6327UR31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6327UR31+T is usually 5 days.
3.What payment methods are accepted for MAX6327UR31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6327UR31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6327UR31+T?
MAX6327UR31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6327UR31+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 MAX6327UR31+T?
For technical support, including MAX6327UR31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6327UR31+T requirements.
6.How does Aetrix verify that MAX6327UR31+T is sourced from the original manufacturer or authorized distributors?
All MAX6327UR31+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 MAX6327UR31+T meets industry standards.
7.What is the process for return or replacement of MAX6327UR31+T?
All MAX6327UR31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6327UR31+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 MAX6327UR31+T part is unused and in its original packaging.
Return procedure for MAX6327UR31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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