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HomeProductsIntegrated Circuits (ICs)PMIC - SupervisorsMAX6346UR44+T
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MAX6346UR44+T - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX6346UR44+T
Manufacturer
Maxim Integrated
Allelco Part Number
32D-MAX6346UR44+T
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
29,956 pcs available, New & Original
Parts Description
IC SUPERVISOR 1 CHANNEL SOT23-3
Package
SOT-23-3
Data sheet
MAX6346UR44+T.pdf

Part Numbering Guide

Part Numbering System.pdf
RoHs Status
ROHS3 Compliant
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In stock: 29956

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Specifications

MAX6346UR44+T Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX6346UR44+T technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX6346UR44+T

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage - Threshold 4.38V
Type Simple Reset/Power-On Reset
Supplier Device Package SOT-23-3
Series -
Reset Timeout 100ms Minimum
Reset Active Low
Product Attribute Attribute Value
Package / Case TO-236-3, SC-59, SOT-23-3
Package Tape & Reel (TR)
Output Push-Pull, Totem Pole
Operating Temperature -40°C ~ 85°C (TA)
Number of Voltages Monitored 1
Mounting Type Surface Mount
Base Product Number MAX6346

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

MAX6346UR44+T Image
MAX6346UR44+T (1)

Manufacturer Part Number

MAX6346UR44+T

Manufacturer

analog-devices

Introduction

The MAX6346UR44+T is a simple reset/power-on reset (POR) supervisor that monitors a single supply voltage. It provides an active-low reset output to indicate when the monitored voltage is below the preset threshold. The reset timeout is a minimum of 100ms to ensure sufficient time for the system to stabilize upon power-up.

Product Features and Performance

Monitors a single supply voltage

38V voltage threshold

Push-pull, totem-pole reset output

Active-low reset signal

Minimum 100ms reset timeout

Wide -40°C to +85°C operating temperature range

Small SOT-23-3 package

Product Advantages

Reliable power-on reset function to ensure proper system initialization

Compact size for space-constrained designs

Wide operating temperature range suitable for industrial and automotive applications

Key Reasons to Choose This Product

Precise voltage monitoring to prevent system malfunctions

Robust reset output to reset connected microcontrollers and other circuitry

Proven reliability and performance from a trusted manufacturer

Cost-effective solution for basic power-on reset requirements

Quality and Safety Features

Fully specified for industrial and automotive temperature ranges

Robust package and design for reliable operation

Compliance with relevant safety and quality standards

Compatibility

The MAX6346UR44+T is a standalone power-on reset supervisor and can be used with a wide range of microcontrollers, processors, and other system components that require a reliable reset signal.

Application Areas

Industrial automation and control systems

Automotive electronics

Embedded systems

General-purpose electronic devices

Product Lifecycle

The MAX6346UR44+T is an active and in-production product from Analog Devices. There are no direct equivalent or alternative models available from the manufacturer at this time. For the latest product information or to inquire about availability, please contact our website's sales team.

Frequently Asked Questions(FAQ)

What is the typical supply current for the MAX6346UR44+T supervisor IC under normal operating conditions, and how does this impact power budgeting in battery-powered applications?
The MAX6346UR44+T draws a quiescent current of approximately 2.5 µA when powered from a 5V supply, as specified in the device's electrical characteristics. This ultra-low consumption makes it suitable for energy-sensitive designs, such as portable medical devices or IoT sensors, where minimizing standby power is critical. When evaluating total system drain over a year with intermittent operation, even small differences in quiescent current can lead to significant variations in battery life—this parameter should be weighed against reset timing requirements during component selection.
How does the 4.38V threshold voltage of the MAX6346UR44+T compare to other common supervisory thresholds like 2.93V or 4.63V, and what design implications arise from choosing this specific value?
The MAX6346UR44+T features a fixed 4.38V monitor threshold, which sits between standard 4.0V and 4.6V reference levels used by many power-on-reset (POR) circuits. Compared to a 4.63V threshold, this lower trip point provides earlier detection of undervoltage conditions, potentially preventing brownout-induced logic errors in microcontrollers running at 3.3V or 5V rails. However, it may trigger more frequently during brief dips in regulated supplies. Designers must ensure that the monitored rail remains stable above 4.38V during all expected transient conditions while avoiding nuisance resets due to ripple or load-step transients.
Can the MAX6346UR44+T be used to monitor multiple supply rails simultaneously, and if not, what alternative approach would maintain reliability across dual-voltage systems?
No, the MAX6346UR44+T is designed to monitor only one voltage rail via its single threshold comparator. To supervise two independent voltages—such as a main 5V supply and an auxiliary 3.3V rail—additional supervisory circuitry is required. One practical solution involves cascading multiple single-channel supervisors or using a dedicated multi-rail PMIC with integrated monitoring logic. Alternatively, a microcontroller with internal ADC and firmware-based monitoring could replace discrete supervision, though this increases software complexity and reduces fault coverage during boot-up sequences before code execution begins.
What are the key differences between push-pull and open-drain output configurations in supervisor ICs like the MAX6346UR44+T, and why might one choose the totem-pole configuration here?
The MAX6346UR44+T provides a push-pull (totem-pole) active-low reset output, meaning it actively drives high when inactive and low when asserted. Unlike open-drain outputs, which require external pull-up resistors, the push-pull design eliminates the need for discrete components and ensures faster rise times without relying on RC networks. This improves noise immunity and simplifies layout, especially important in compact SOT-23-3 packages. In systems where the reset line connects directly to a microcontroller’s nRESET pin without series resistance, the integrated drive strength minimizes signal degradation over trace length.
Is it safe to operate the MAX6346UR44+T near its maximum junction temperature of 150°C, and how do ambient conditions affect long-term reliability?
While the absolute maximum junction temperature is 150°C, continuous operation near this limit significantly accelerates aging mechanisms such as electromigration and bond-wire fatigue. The device specifies an operating range of -40°C to +85°C (TA), aligning with industrial-grade standards. In high-power-density environments, thermal derating should be applied—typically reducing maximum allowable power dissipation by 5–10% per °C above 70°C. Proper PCB copper allocation and airflow management help maintain die temperatures well below 100°C, ensuring robust performance across mission cycles exceeding 10 years.
How does the 100ms minimum reset timeout of the MAX6346UR44+T influence system initialization timing, and what risks emerge if the timeout is insufficient for a given MCU?
The guaranteed minimum 100ms assertion time ensures that downstream processors have adequate stabilization window after power-up or recovery from brownout. For MCUs with internal voltage regulators requiring up to 80ms to stabilize, this margin allows full initialization before releasing reset. However, in systems using fast-startup MCUs with sub-30ms boot times, the extended delay may introduce unnecessary latency. Conversely, insufficient hold-off time can cause premature release during unstable supply ramps, leading to corrupted flash writes or erratic behavior. Always verify worst-case startup sequences using oscilloscope measurements rather than relying solely on datasheet figures.
What precautions should be taken when routing signals near the MAX6346UR44+T on a high-speed digital board to avoid unintended resets or noise coupling?
Although the MAX6346UR44+T operates at relatively low frequencies (<1kHz for reset pulses), its analog comparator input is sensitive to supply noise and substrate coupling. Keep the VCC and GND traces short and wide to minimize inductance, and place decoupling capacitors (0.1µF ceramic) within 1mm of the package. Avoid routing high-impedance traces near the RESET output, and consider guard rings around the input pins if sharing space with switching regulators. Ground plane continuity beneath the device enhances stability, particularly when monitoring noisy industrial power sources.
How does moisture sensitivity level (MSL) classification affect handling and storage of Tape & Reel packaged MAX6346UR44+T units in automated assembly lines?
With an MSL rating of 1, the MAX6346UR44+T is considered non-critical and can be stored indefinitely at <60% relative humidity without baking prior to reflow. This facilitates just-in-time processing in SMT production lines where inventory turnover exceeds 12 months. Nonetheless, exposure to humid environments (>85% RH) for prolonged periods may still induce popcorning during lead-free reflow profiles exceeding 260°C peak. Standard ESD protocols (IEC 61340-5-1) remain mandatory, but no additional drying steps are required before placement compared to higher MSL grades.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX6346UR44+T

Product Attribute MAX6346UR44-T MAX6346UR46+T MAX6346UR43+ MAX6346UR40+
Part Number MAX6346UR44-T MAX6346UR46+T MAX6346UR43+ MAX6346UR40+
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Mounting Type - Surface Mount Through Hole Surface Mount
Base Product Number - DAC34H84 MAX500 ADS62P42
Output - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Type - - - -
Reset Timeout - - - -
Voltage - Threshold - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Number of Voltages Monitored - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Reset - - - -

MAX6346UR44+T Datasheet PDF

Download MAX6346UR44+T pdf datasheets and Analog Devices Inc./Maxim Integrated documentation for MAX6346UR44+T - Analog Devices Inc./Maxim Integrated.

Datasheets
MAX6326-28,46-48.pdf
Application Notes
Micropower Circuit Offers Automatic Shutdown and L.pdf
Environmental Information
Maxim Integrated REACH.pdf Maxim Integrated RoHS Cert.pdf Red Phosphorous Certificate.pdf
Part Numbering Guide
Part Numbering System.pdf

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Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
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Electrostatic Discharge Protection and Handling

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MAX6346UR44+T Image

MAX6346UR44+T

Analog Devices Inc./Maxim Integrated
32D-MAX6346UR44+T

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