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Analog Devices Inc./Maxim Integrated MAX6327UR31
- Part No.:
- MAX6327UR31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6327UR31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,544
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Product details
Overview
MAX6327UR31 from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor 3.08V power supplies and assert a reset signal during brownout, power-up, and power-down events. It features 1µA max supply current, 100ms min reset timeout, factory-trimmed 3.08V threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset control.
For engineers reviewing the MAX6327UR31 datasheet, MAX6327UR31 pinout, MAX6327UR31 application, or MAX6327UR31 equivalent, key selection criteria include its active-high push-pull RESET output, SOT23-3 package, ultra-low ICC, precise 3.08V threshold with tight tempco (40ppm/°C), and immunity to fast VCC transients - all critical for embedded µP reset integrity in space-constrained, low-power designs.
Technical Context
The MAX6327UR31 implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC drops below its factory-set 3.08V threshold. Its internal timing circuit guarantees a minimum 100ms reset assertion after VCC recovers, independent of supply ramp rate.
It uses a push-pull output stage capable of sourcing ≥500µA at 0.8·VCC while asserted, and sinking up to 1.2mA when deasserted. The device remains fully functional down to 1.2V VCC and ignores transients shorter than ~100µs at typical overdrive levels - enabling robust operation in noisy power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (factory-trimmed, ±1.5% at +25°C); ensures accurate brownout detection for 3.0–3.3V systems |
| Supply Current | 1.0µA max at 3.0V; enables multi-year battery life in always-on portable devices |
| Reset Timeout | 100ms min power-up delay; guarantees µP initialization completes before release |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep brownout and full-system power sequencing |
| Output Type | Active-high push-pull; eliminates external pull-up resistor, reduces BOM count and board area |
| Tempco | 40ppm/°C; maintains threshold stability across industrial temperature range (-40°C to +85°C) |
| Hysteresis | 6.3mV; prevents oscillatory reset assertion near threshold due to noise or slow VCC ramps |
Pinout & Package
MAX6327UR31 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized 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 low-impedance for stable reset timing |
| 2 (RESET) | Active-high push-pull output | Drives µP RESET pin high during fault; sinks current when deasserted; no external pull-up required |
| 3 (VCC) | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables integration into energy-harvesting and coin-cell-powered systems without compromising runtime |
| Precision 3.08V threshold | Factory-trimmed to ±1.5% at room temperature ensures consistent system-level reset behavior across production lots |
| 100ms guaranteed timeout | Internally timed reset pulse eliminates need for external RC networks and associated component drift |
| VCC transient immunity | Rejects sub-100µs negative glitches on VCC - prevents spurious resets in electrically noisy environments |
| 1.2V minimum VCC operation | Continues supervision during deep brownout, supporting graceful shutdown or last-gasp data save in µP systems |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller Systems |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells, operating from 3.2V down to 1.8V during discharge. IC Role / Device Role / Timing Role: Supervises main 3.0V LDO output and asserts active-high RESET to ARM Cortex-M0 until stable power is confirmed. Use Value: 1µA ICC extends battery life >5 years in sleep mode; 3.08V threshold aligns precisely with LDO dropout voltage to prevent premature reset release. | Use Scenario: Programmable logic controller (PLC) I/O module with isolated 3.3V digital supply. IC Role / Device Role / Timing Role: Monitors 3.3V rail and holds µC in reset during AC line sags or ESD-induced dips. Use Value: 100ms timeout exceeds worst-case power-supply recovery time; push-pull output drives long traces without signal degradation. |
| Medical Wearable Sensors | Automotive Body Control Modules |
Use Scenario: ECG patch using lithium polymer battery and low-quiescent DC/DC converter. IC Role / Device Role / Timing Role: Resets Bluetooth SoC when regulated 3.0V supply falls below safe operating margin. Use Value: 40ppm/°C tempco ensures threshold stability across body-worn temperature range (0°C–50°C); SOT23-3 saves space on compact flex PCB. | Use Scenario: Door module with 12V-to-3.3V buck converter powering CAN transceiver and MCU. IC Role / Device Role / Timing Role: Provides fail-safe reset during load-dump or cold-crank conditions affecting 3.3V rail. Use Value: Immunity to 50µs VCC transients prevents false resets during alternator switching noise; operates reliably down to 1.2V during cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR31D3-T | Same 3.08V threshold, but active-low open-drain output; requires external pull-up; 1.5µA ICC | Requires board-level redesign for pull-up and logic inversion; less suitable for direct µP RESET pin drive | Select only if legacy design mandates active-low or open-drain topology |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V); 1.8µA ICC; adjustable delay via capacitor; different pinout (GND-VIN-RESET) | Threshold mismatch may cause early/late reset in 3.0V systems; capacitor-based timing adds component and layout overhead | Prefer only when adjustable timeout or higher threshold tolerance is required |
Compared with MAX809TR31D3-T and TPS3808G33DBVR, the MAX6327UR31 delivers exact 3.08V detection with zero external components, active-high push-pull drive, and lowest ICC - making it optimal for cost-sensitive, space-constrained, and battery-critical µP reset applications where threshold accuracy and simplicity are paramount.
Availability
MAX6327UR31 is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, medical wearables, and automotive body electronics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6327UR31 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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX6326/MAX6327/MAX6328 family was designed specifically for ultra-low-power, precision voltage monitoring in microprocessor-based systems - delivering guaranteed reset timing, minimal external dependencies, and robust noise immunity in miniature packages.
FAQ
What is the exact reset threshold voltage of MAX6327UR31 and how tightly is it specified?
The MAX6327UR31 has a factory-trimmed nominal reset threshold of 3.08V. At +25°C, this is guaranteed within ±1.5% (2.925V to 3.075V). Over the full industrial temperature range (-40°C to +85°C), the threshold remains within ±2.5% (3.003V to 3.150V), with a tempco of 40ppm/°C. These specifications are production-tested and documented in the official Maxim datasheet for MAX6327UR31.
Does MAX6327UR31 require any external components to function?
No, MAX6327UR31 requires no external components. Its precision reset threshold is factory-trimmed, its 100ms reset timeout is internally generated, and its active-high push-pull RESET output drives directly into a microprocessor's reset pin without needing a pull-up resistor. This eliminates BOM items, reduces PCB area, and improves reliability compared to RC-based or open-drain alternatives.
What is the supply current of MAX6327UR31 and under what conditions is it measured?
The MAX6327UR31 draws a maximum supply current (ICC) of 1.0µA when VCC = 3.0V (for VTH ≤ 2.93V) or VCC = 3.2V (for VTH > 2.93V), with no load. At VCC = 5.5V, ICC is 1.75µA max. These values are specified over temperature and represent worst-case quiescent consumption - critical for battery-powered applications where MAX6327UR31 enables multi-year operation.
How does MAX6327UR31 handle fast transients on the VCC supply line?
MAX6327UR31 is designed to ignore fast negative-going VCC transients. Its reset comparator incorporates filtering that rejects pulses shorter than approximately 100µs when VCC dips 100mV below the 3.08V threshold. This immunity prevents spurious resets caused by switching noise, ESD, or load-dump events - a key reliability feature confirmed in the Typical Operating Characteristics graphs of the MAX6327UR31 datasheet.
What package type and pin configuration does MAX6327UR31 use?
MAX6327UR31 is supplied in a 3-pin SOT23-3 package (JEDEC MO-178AA), with pin 1 = GND, pin 2 = RESET (active-high push-pull), and pin 3 = VCC. This compact 1.3mm × 2.9mm outline is compatible with standard pick-and-place equipment and matches the footprint of industry-standard supervisory circuits like the MAX809 series.
MAX6327UR31 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for MAX6327UR31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6327UR31 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 reliable?
The price and inventory of MAX6327UR31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6327UR31 is usually 5 days.
3.What payment methods are accepted for MAX6327UR31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6327UR31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6327UR31?
MAX6327UR31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6327UR31 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?
For technical support, including MAX6327UR31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6327UR31 requirements.
6.How does Aetrix verify that MAX6327UR31 is sourced from the original manufacturer or authorized distributors?
All MAX6327UR31 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 meets industry standards.
7.What is the process for return or replacement of MAX6327UR31?
All MAX6327UR31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6327UR31, 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 part is unused and in its original packaging.
Return procedure for MAX6327UR31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6327UR31 Tags
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MIC826SYMT-TR
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