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HomeProductsIntegrated Circuits (ICs)PMIC - SupervisorsMAX6346UR34+T
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MAX6346UR34+T - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX6346UR34+T
Manufacturer
Maxim Integrated
Allelco Part Number
98D-MAX6346UR34+T
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
7,127 pcs available, New & Original
Parts Description
IC SUPERVISOR 1 CHANNEL SOT23-3
Package
SOT-23-3
Data sheet
MAX6346UR34+T.pdf

Part Numbering Guide

Part Numbering System.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf
RoHs Status
ROHS3 Compliant
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Specifications

MAX6346UR34+T Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX6346UR34+T technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX6346UR34+T

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage - Threshold 3.4V
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

Frequently Asked Questions(FAQ)

What is the recommended minimum supply voltage for reliable operation of the MAX6346UR34+T supervisor IC in a 3.3V system design?
The MAX6346UR34+T features a 3.4V threshold voltage, which means it will begin monitoring when the input exceeds this value. In a 3.3V system, the supervisor may not activate until the supply dips below approximately 3.4V, potentially causing false resets or failure to detect undervoltage conditions. For proper functionality, the system should maintain a stable supply above 3.4V, requiring careful regulation and margining in low-voltage applications.
How does the MAX6346UR34+T compare to other voltage supervisors with similar thresholds like the MAX809 in terms of reset timeout and output configuration?
Unlike the MAX809, which typically offers an open-drain output with external pull-up and configurable timeout delays, the MAX6346UR34+T provides a push-pull (totem pole) output that actively drives both high and low without needing external components. Its fixed 100ms minimum reset timeout simplifies timing design but offers less flexibility than adjustable variants. The MAX6346’s active-low reset signal and single-channel architecture make it suitable for basic power-on reset circuits, whereas the MAX809 series often supports multiple thresholds and longer delay options for more complex sequencing.
Can the MAX6346UR34+T be used effectively in battery-powered applications with varying load conditions?
What impact does temperature have on the accuracy of the reset threshold in the MAX6346UR34+T across its operating range?
While the datasheet specifies a threshold of 3.4V without explicit tempco data, typical CMOS-based supervisory circuits exhibit minimal drift over the -40°C to +85°C range—usually within ±1% total variation. Assuming standard manufacturing tolerances and no extreme process variations, the actual threshold may vary between approximately 3.36V and 3.44V under worst-case conditions. This level of stability makes it acceptable for most general-purpose applications, though precision systems requiring tighter control might need additional feedback or calibration mechanisms.
Is it feasible to cascade multiple MAX6346UR34+T devices to monitor multiple rails in a multi-voltage microcontroller system?
Technically possible, but not recommended due to redundancy and potential timing conflicts. Each MAX6346UR34+T operates independently with identical thresholds, so they would likely trigger simultaneously on the same rail. Using them across different rails requires precise threshold matching and careful coordination of reset signals, which defeats the purpose of having distinct monitoring points. Instead, consider dedicated multi-rail supervisors or programmable PMICs that support multiple thresholds and flexible reset logic per channel.
How should the MAX6346UR34+T be connected when interfacing with a processor that uses open-collector GPIOs for reset indication?
Since the MAX6346UR34+T provides a push-pull output, it can directly drive standard CMOS inputs including open-collector GPIOs. No external resistors are needed unless isolation or level shifting is required. However, if the target GPIO expects an active-high signal while the supervisor provides active-low reset, an inverter gate or software handling may be necessary depending on the processor’s reset interpretation requirements.
What are the implications of using the MAX6346UR34+T in environments prone to electromagnetic interference?
As a digital supervisor IC, the MAX6346UR34+T contains internal noise filtering and hysteresis characteristics that help reject brief glitches. However, in high-noise industrial settings, external RC filters on the VCC pin (typically 0.1µF ceramic plus 1µF bulk capacitor) are strongly advised to prevent spurious resets. Proper PCB layout with short traces, ground plane proximity, and shielding also reduces susceptibility to EMI-induced voltage fluctuations around the 3.4V threshold.
Does the MAX6346UR34+T support manual reset functionality through an external button?
No, the MAX6346UR34+T is designed exclusively as a power-on reset (POR) device. It lacks a dedicated MR (manual reset) pin and cannot respond to external user input. To add manual reset capability, an additional circuit using a transistor or logic gate must be implemented alongside the supervisor, driving the same reset line with proper debouncing and timing alignment.
What happens if the supply voltage to the MAX6346UR34+T momentarily exceeds its absolute maximum rating?
Exceeding the absolute maximum ratings—such as supplying more than 5.5V on the VCC pin—risks permanent damage to the internal circuitry due to oxide breakdown or ESD structures. Even brief overvoltages outside the specified range can degrade long-term reliability or cause immediate failure. Always ensure input voltages remain within the 1.0V to 5.5V window, especially during hot-plug scenarios or unregulated power sources.
How does package choice affect thermal performance and reliability when deploying the MAX6346UR34+T in compact handheld devices?
The MAX6346UR34+T comes in SOT-23-3 packaging, which offers adequate thermal dissipation for low-power digital functions like supervision. With a typical junction-to-ambient thermal resistance of around 150–200°C/W, it handles continuous operation well under normal conditions. In dense handheld designs, placement near heat-generating components should be avoided, and via stitching or copper pours can marginally improve heat spreading. However, since quiescent current is extremely low (<1µA), thermal concerns are generally secondary to electrical layout and decoupling.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX6346UR34+T

Product Attribute MAX6346UR34+ MAX6346UR33+T MAX6346UR39+ MAX6346UR41+
Part Number MAX6346UR34+ MAX6346UR33+T MAX6346UR39+ MAX6346UR41+
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Reset - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Output - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Voltage - Threshold - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Type - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Reset Timeout - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Voltages Monitored - - - -

MAX6346UR34+T Datasheet PDF

Download MAX6346UR34+T pdf datasheets and Analog Devices Inc./Maxim Integrated documentation for MAX6346UR34+T - Analog Devices Inc./Maxim Integrated.

Datasheets
MAX6326-28,46-48.pdf
Part Numbering Guide
Part Numbering System.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf
Application Notes
Micropower Circuit Offers Automatic Shutdown and L.pdf
Environmental Information
Maxim Integrated REACH.pdf Maxim Integrated RoHS Cert.pdf

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MAX6346UR34+T Image

MAX6346UR34+T

Analog Devices Inc./Maxim Integrated
98D-MAX6346UR34+T

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