Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX6343ZUT

Name: MAX6343ZUT
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6343ZUT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MAX6343ZUT

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: SOT-23-6

Datasheet:: MAX6343ZUT.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-6

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,558

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MAX6343ZUT from Maxim Integrated is a precision 6-pin SOT23 microprocessor supervisory circuit with factory-trimmed 2.33V V_CC reset threshold, active-low open-drain RESET output, and integrated +1.25V power-fail comparator (PFI/PFO). It operates from +1V to +5.5V supply, guarantees RESET validity down to V_CC = +1V, and delivers ≥100ms reset pulse width-designed for reliable power-up sequencing in battery-powered embedded systems.

For engineers reviewing the MAX6343ZUT datasheet, MAX6343ZUT pinout, MAX6343ZUT application, or MAX6343ZUT equivalent, this device is selected for low-voltage brownout detection, manual-reset–enabled system recovery, and dual-supply monitoring where open-drain reset flexibility and guaranteed sub-2.5V threshold accuracy are critical.

Technical Context

The MAX6343ZUT implements a precision bandgap-based reset comparator with ±25mV (±1.1%) threshold tolerance over –40°C to +125°C, paired with a dedicated +1.25V reference for PFI input. Its open-drain RESET output supports level-shifting across multiple supply domains up to +5.5V via external pull-up.

It features debounced CMOS-compatible MR input with 1µs minimum pulse width rejection, 0.1µs MR glitch immunity, and PFI-to-PFO delay of ≤3µs-enabling fast power-fail warning for orderly shutdown in telecom and portable equipment.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Reset Threshold	2.33V ±25mV (±1.1%) - factory-trimmed for accurate brownout detection at ultra-low voltage rails
Supply Voltage Range	+1.0V to +5.5V - enables operation during deep brownout and compatibility with 1.2V–5V logic domains
RESET Pulse Width	100ms min - ensures µP reset assertion meets ARM/Intel/MIPS boot initialization timing requirements
PFI Threshold	+1.25V ±100mV - fixed internal reference for reliable power-fail or low-battery warning generation
RESET Output Type	Active-low open-drain - allows wired-OR configuration, multi-rail pull-up, and voltage-level translation
MR Input Compatibility	CMOS logic (V_IL ≤ 0.3×V_CC, V_IH ≥ 0.7×V_CC) - supports direct pushbutton or FPGA GPIO interface without external conditioning
Operating Temperature	–40°C to +125°C - qualified for automotive under-hood, industrial control, and extended-range portable use

Pinout & Package

Package: 6-pin SOT23-6 (1.6mm × 2.9mm × 1.1mm), RoHS-compliant, surface-mount.

Pin/Terminal	Circuit Role	Design Meaning
1 - V_CC	Positive supply input	Power rail input; supports bypass capacitor placement for transient immunity (1µF recommended)
2 - GND	Ground reference	Analog/digital common return; must be low-impedance connection to minimize noise coupling into reset comparator
3 - PFI	Power-fail monitor input	Connects to resistor divider for secondary supply monitoring; trips PFO when voltage falls below +1.25V
4 - PFO	Power-fail output	Active-low open-drain signal; asserts when PFI < +1.25V-used for early-warning interrupt or MR triggering
5 - MR	Manual-reset input	CMOS-compatible active-low input; debounced internally; forces reset on falling edge and holds for t_RP
6 - RESET	Reset output	Active-low open-drain output; requires external pull-up; sinks ≥100µA at V_OL ≤ 0.4V (V_CC > 1.2V)

Key Features

Feature	Design Value
Factory-trimmed 2.33V reset threshold	Eliminates external resistor network and calibration; reduces BOM count and layout area in space-constrained designs
Guaranteed RESET validity to V_CC = +1V	Ensures deterministic reset behavior during deep undervoltage conditions where many supervisors fail silently
+1.25V precision PFI reference	Enables accurate secondary supply monitoring (e.g., battery, analog rail) without external reference IC
100ms minimum reset timeout	Meets JEDEC JESD78 and Intel/ARM processor reset hold-time specifications without external RC timing
Open-drain RESET with 6V absolute max rating	Permits pull-up to higher voltage rails (e.g., 3.3V RESET line driven from 5V domain) without level translators

Applications

Portable/Battery-Powered Equipment	Telecom Equipment
Use Scenario: Smart meter with Li-ion backup battery operating down to 2.4V nominal, requiring brownout detection before data corruption. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to MCU when main supply drops below 2.33V or battery voltage falls below 2.8V (via PFI divider). Use Value: Prevents flash write corruption and state-machine lockup by guaranteeing ≥100ms reset hold time even at V_CC = 1.1V.	Use Scenario: Optical line terminal (OLT) with dual 3.3V/1.2V rails and hot-swap controller requiring coordinated power sequencing and fault signaling. IC Role / Device Role / Timing Role: Monitors 3.3V rail with 2.33V threshold and 1.2V rail via PFI divider; uses PFO to trigger hot-swap disable before brownout. Use Value: Enables graceful shutdown of SERDES and PHY blocks using PFO interrupt, avoiding packet loss during power collapse.
Multivoltage Systems	Embedded Control Systems
Use Scenario: Industrial PLC with isolated 24V DC input, 5V logic, and 3.3V I/O-requiring independent reset assertion per rail failure. IC Role / Device Role / Timing Role: MAX6343ZUT monitors 3.3V rail; PFO tied to MR of second supervisor on 5V rail to cascade reset propagation. Use Value: Achieves hierarchical reset coordination without additional logic gates or microcontroller intervention.	Use Scenario: Automotive body control module (BCM) with CAN interface, needing robust reset during cold-crank (4.5V–6V transients) and start-stop cycles. IC Role / Device Role / Timing Role: Provides precise 2.33V reset threshold for 3.3V microcontroller domain and rejects ≤12µs V_CC glitches per Figure 4. Use Value: Eliminates false resets during engine cranking while ensuring valid reset assertion during sustained brownout.

Portable/Battery-Powered Equipment

Telecom Equipment

Use Scenario: Smart meter with Li-ion backup battery operating down to 2.4V nominal, requiring brownout detection before data corruption.

IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to MCU when main supply drops below 2.33V or battery voltage falls below 2.8V (via PFI divider).

Use Value: Prevents flash write corruption and state-machine lockup by guaranteeing ≥100ms reset hold time even at V_CC = 1.1V.

Use Scenario: Optical line terminal (OLT) with dual 3.3V/1.2V rails and hot-swap controller requiring coordinated power sequencing and fault signaling.

IC Role / Device Role / Timing Role: Monitors 3.3V rail with 2.33V threshold and 1.2V rail via PFI divider; uses PFO to trigger hot-swap disable before brownout.

Use Value: Enables graceful shutdown of SERDES and PHY blocks using PFO interrupt, avoiding packet loss during power collapse.

Multivoltage Systems

Embedded Control Systems

Use Scenario: Industrial PLC with isolated 24V DC input, 5V logic, and 3.3V I/O-requiring independent reset assertion per rail failure.

IC Role / Device Role / Timing Role: MAX6343ZUT monitors 3.3V rail; PFO tied to MR of second supervisor on 5V rail to cascade reset propagation.

Use Value: Achieves hierarchical reset coordination without additional logic gates or microcontroller intervention.

Use Scenario: Automotive body control module (BCM) with CAN interface, needing robust reset during cold-crank (4.5V–6V transients) and start-stop cycles.

IC Role / Device Role / Timing Role: Provides precise 2.33V reset threshold for 3.3V microcontroller domain and rejects ≤12µs V_CC glitches per Figure 4.

Use Value: Eliminates false resets during engine cranking while ensuring valid reset assertion during sustained brownout.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6342ZUT-T	Active-low push-pull RESET (not open-drain); includes MR input; same 2.33V threshold and package	Requires single-rail reset drive; no external pull-up needed; incompatible with wired-OR or multi-supply reset buses	Select when board uses only one logic voltage and layout lacks space for pull-up resistor
TPS3808G12DBVR	2.63V fixed threshold; push-pull active-low RESET; 350ms default timeout; 1.5µA quiescent current	Higher threshold and longer timeout; lower IQ; no PFI/PFO function; SOT23-6 pinout differs (RESET on Pin 6 vs. Pin 5)	Select when ultra-low power dominates and power-fail warning is unnecessary; verify PCB pinout compatibility

Compared with MAX6342ZUT-T and TPS3808G12DBVR, the MAX6343ZUT uniquely combines 2.33V precision threshold, open-drain flexibility, and integrated PFI/PFO in SOT23-6-making it optimal for dual-supply monitoring and multi-rail reset architectures where level-shifting and interrupt-driven shutdown are required.

Availability

MAX6343ZUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, telecom equipment, and multivoltage systems requiring stable component supply, long-term lifecycle support, and AEC-Q200–aligned reliability validation.

Supply support for MAX6343ZUT 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 design and manufacturing leader specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6342–MAX6345 family was designed specifically for robust, low-voltage microprocessor supervision in space- and power-constrained applications-emphasizing precision threshold accuracy, wide temperature operation, and integrated power-fail warning capability.

FAQ

What is the exact reset threshold voltage of the MAX6343ZUT?

The MAX6343ZUT has a factory-trimmed nominal reset threshold of 2.33V, with a guaranteed tolerance of ±25mV (±1.1%) over the full –40°C to +125°C operating temperature range. This value is laser-trimmed during production and specified in the Electrical Characteristics table under V_TH for the "Z" suffix variant. The MAX6343ZUT does not require external resistors to set this threshold.

Does the MAX6343ZUT support operation below 2.0V supply voltage?

Yes, the MAX6343ZUT is fully specified to operate from V_CC = +1.0V to +5.5V. Its reset output remains valid (logic-low or high-impedance) down to V_CC = +1V, and the internal comparator continues functioning-unlike many supervisors that cease operation below 1.8V. This makes the MAX6343ZUT suitable for ultra-low-voltage battery-backed systems where other reset ICs fail to assert reliably.

How is the PFI input used in the MAX6343ZUT, and what voltage triggers PFO?

The PFI input of the MAX6343ZUT connects to an internal +1.25V reference comparator. When the voltage at PFI falls below +1.25V (±100mV), the PFO output goes low. This enables monitoring of secondary supplies-such as batteries or analog rails-using a simple resistor divider. For example, a 2.8V battery can be monitored by setting the divider ratio so PFI = 1.25V at V_BAT = 2.8V, causing PFO assertion before critical discharge.

Can the MAX6343ZUT's RESET output drive a 5V logic input directly?

No-the MAX6343ZUT features an active-low open-drain RESET output, which cannot source current. To interface with a 5V logic input, an external pull-up resistor (e.g., 10kΩ) must connect RESET to the 5V rail. The MAX6343ZUT sink capability (≥100µA at V_OL ≤ 0.4V) ensures clean low-level assertion, and its absolute maximum rating of +6V on RESET allows safe operation with 5V pull-ups-enabling level-shifted reset signaling without additional components.

Is the MAX6343ZUT pin-compatible with other members of the MAX6342–MAX6345 family?

Yes, all MAX6342–MAX6345 variants-including the MAX6343ZUT-share identical 6-pin SOT23-6 pinouts and footprint. Pin 1 is V_CC, Pin 2 is GND, Pin 3 is PFI, Pin 4 is PFO, Pin 5 is MR, and Pin 6 is RESET. However, functional differences exist: MAX6343ZUT uses open-drain RESET (Pin 6), whereas MAX6342ZUT uses push-pull RESET on the same pin. Swapping requires verifying reset output type compatibility in the target circuit.

MAX6343ZUT Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: SOT-23-6

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.33V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 100ms Minimum

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-6

MAX6343ZUT FAQ

1.How can I place an order for MAX6343ZUT through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6343ZUT 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 MAX6343ZUT reliable?

The price and inventory of MAX6343ZUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6343ZUT is usually 5 days.

3.What payment methods are accepted for MAX6343ZUT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6343ZUT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6343ZUT?

MAX6343ZUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6343ZUT 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 MAX6343ZUT?

For technical support, including MAX6343ZUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6343ZUT requirements.

6.How does Aetrix verify that MAX6343ZUT is sourced from the original manufacturer or authorized distributors?

All MAX6343ZUT 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 MAX6343ZUT meets industry standards.

7.What is the process for return or replacement of MAX6343ZUT?

All MAX6343ZUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6343ZUT, 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 MAX6343ZUT part is unused and in its original packaging.

Return procedure for MAX6343ZUT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…