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Analog Devices Inc./Maxim Integrated MAX6339KUT+T
- Part No.:
- MAX6339KUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6339KUT+T.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6339KUT+T from Maxim Integrated is a quad voltage supervisory IC that monitors four system supply rails-including two user-adjustable thresholds (IN1 and IN4) and fixed +3.3V (IN2) and +2.5V (IN3) inputs-with ±10% tolerance. It asserts a single active-low open-drain RESET output when any input falls below its threshold, with 140ms minimum timeout. Used in telecom and industrial embedded systems for power-rail integrity assurance.
For engineers reviewing the MAX6339KUT+T datasheet, MAX6339KUT+T pinout, MAX6339KUT+T application, or MAX6339KUT+T equivalent, key selection criteria include its dual adjustable-input architecture, 55µA quiescent current, SOT23-6 package footprint, -40°C to +85°C operation, and immunity to short-duration supply transients.
Technical Context
The MAX6339KUT+T integrates an accurate bandgap reference, four precision comparators, and internal resistor-divider networks for fixed thresholds-while bypassing those networks on IN1 and IN4 to support external resistor-divider–based voltage monitoring at +1.23V internal reference. Each comparator features 0.3% typical hysteresis for noise immunity.
Powered from IN2 (nominal +3.3V), the device guarantees RESET validity down to IN1 ≥ 1V or IN2 ≥ 1V. Its open-drain RESET output includes a 10µA internal pullup to IN2, eliminating need for external pullup in many logic interfacing scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input | IN2 powers device; operates from 1.0V to 5.5V - enables direct monitoring of main system rail as supply source. |
| Reset Threshold Accuracy | +3.3V IN2: 3.00V to 3.15V (-5%); +2.5V IN3: 2.13V to 2.25V (-10%) - ensures reliable undervoltage detection across temperature. |
| Adjustable Threshold Reference | 1.23V ±0.03V (±0.3% hysteresis) at IN1/IN4 - supports custom monitoring via external resistor divider with <1% error using ≤100kΩ R2. |
| Quiescent Current | 55µA typical - minimizes standby power impact in battery-backed or low-power systems. |
| Reset Timeout Period | 140ms to 280ms - provides sufficient hold time for µP initialization and peripheral stabilization after supply recovery. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom environments without derating. |
Pinout & Package
The MAX6339KUT+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts and compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN1 | User-adjustable monitor input | Accepts external resistor divider; internal 1.23V threshold enables custom voltage monitoring (e.g., 1.5V, 4.2V). |
| 2 - IN2 | Power supply & fixed monitor input | Device power source and +3.3V monitored rail; RESET valid if IN2 ≥ 1V. |
| 3 - IN3 | Fixed monitor input | +2.5V (-10%) threshold (2.13V–2.25V); no external components required. |
| 4 - IN4 | User-adjustable monitor input | Same 1.23V reference as IN1; supports second custom rail (e.g., auxiliary 1.0V or 3.6V). |
| 5 - GND | Analog/digital ground | Common return for all internal circuits; must be low-impedance connection to system ground plane. |
| 6 - RESET | Active-low open-drain output | Asserted low during fault; internal 10µA pullup to IN2 eliminates external resistor in same-rail logic interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual user-adjustable inputs (IN1, IN4) | Enables monitoring of nonstandard rails (e.g., 1.05V core, 4.75V bias) without adding discrete comparators or resistors beyond divider network. |
| Fixed +3.3V and +2.5V monitoring | Eliminates external resistor dividers for common system rails - reduces BOM count and layout area by up to 4 passive components per rail. |
| 140ms min reset timeout with hysteresis | Prevents false resets during marginal supply recovery; 0.3% hysteresis rejects noise spikes up to 9mV on 3.0V rail. |
| RESET valid down to 1V supply | Ensures supervisory function remains active during brown-out conditions where IN1 or IN2 drops near cutoff - critical for graceful shutdown sequencing. |
| Immunity to short supply transients | Rejects glitches ≤100µs duration (at 50mV overdrive), verified per MAX6339toc04 - avoids spurious resets in noisy switching power supply environments. |
Applications
| Telecom Line Cards | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring multiple isolated DC rails (+3.3V FPGA core, +2.5V SerDes, +1.2V ADC, +5V analog bias) on a dense line card with strict space constraints. IC Role / Device Role / Timing Role: Quad voltage supervisor providing single RESET signal to FPGA and microcontroller upon any rail failure; timing-critical 140ms timeout ensures full configuration reload. Use Value: Replaces four discrete supervisors and eight resistors, reducing component count by 75% and PCB area by >30mm² while maintaining AEC-Q100–level reliability. | Use Scenario: Ensuring safe startup and fault response in modular PLC backplanes with mixed-voltage I/O modules (+24V field side, +5V logic, +3.3V MCU, +1.8V FPGA). IC Role / Device Role / Timing Role: Supervises +3.3V (MCU), +2.5V (FPGA I/O), and two custom rails (e.g., +12V sensor bias, +1.2V FPGA core) - all referenced to local ground. Use Value: Dual adjustable inputs allow precise monitoring of nonstandard voltages without redesign; 55µA current enables always-on supervision in low-power sleep modes. |
| High-End Network Switches | Medical Diagnostic Imaging Systems |
Use Scenario: Validating stable power delivery to ASICs, PHYs, and memory subsystems across 12+ voltage domains in a 1RU switch chassis. IC Role / Device Role / Timing Role: Monitors +3.3V management rail, +2.5V memory interface, and two auxiliary rails (e.g., +1.0V DDR4 VDDQ, +1.8V SerDes) before releasing global RESET. Use Value: Single-chip solution eliminates timing skew between independent supervisors - ensures synchronous release of all downstream logic blocks. | Use Scenario: Power sequencing and fault detection for multi-rail imaging subsystems (e.g., +5V detector bias, +3.3V FPGA, +2.5V ADC, +1.5V image sensor core). IC Role / Device Role / Timing Role: Provides fail-safe reset assertion during transient drop on any rail; RESET remains asserted until all rails stabilize for ≥140ms - meeting IEC 62304 Class C timing requirements. Use Value: Internal 1.23V reference enables accurate monitoring of low-noise analog rails without external precision references, reducing EMI-sensitive component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6340KUT+T | Same pinout and dual adjustable inputs, but with +3.3V/-5V fixed thresholds instead of +3.3V/+2.5V - requires redesign if -5V rail is absent. | Targeted at systems requiring negative rail monitoring (e.g., op-amp bias), not +2.5V digital I/O rails. | Select only if system includes a -5V supply and no +2.5V rail; otherwise, MAX6339KUT+T offers better match for modern digital logic supplies. |
| TPS3307-33DBVR | Triple-supply monitor (not quad); fixed +3.3V, +1.8V, +1.2V thresholds; no adjustable inputs; 200ms reset timeout. | Lacks fourth monitoring channel and user-adjustable capability - insufficient for four-rail systems without adding secondary supervisor. | Use only in three-rail designs where IN1/IN4 adjustability is unnecessary; MAX6339KUT+T provides full functional coverage with no compromise. |
Compared with MAX6340KUT+T and TPS3307-33DBVR, the MAX6339KUT+T uniquely combines dual adjustable inputs with fixed +3.3V/+2.5V monitoring in SOT23-6 - enabling complete four-rail supervision without external components or layout changes.
Availability
MAX6339KUT+T is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial PLCs, and high-end networking equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MAX6339KUT+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6339 product line delivers compact, low-power supervisory solutions for multi-rail systems - specifically engineered to replace discrete monitoring circuits in space- and reliability-critical embedded platforms.
FAQ
What voltage thresholds does the MAX6339KUT+T monitor by default?
The MAX6339KUT+T monitors +3.3V (IN2) and +2.5V (IN3) with ±10% tolerance (3.00V–3.15V and 2.13V–2.25V respectively), while IN1 and IN4 are user-adjustable via external resistor dividers referenced to a 1.23V internal threshold. This configuration is confirmed in the Selector Guide and Electrical Characteristics table of the MAX6339KUT+T datasheet.
Can the MAX6339KUT+T monitor negative voltages?
The MAX6339KUT+T does not support negative voltage monitoring - its IN1 and IN4 adjustable inputs are designed for positive rails only, and IN2/IN3 are specified for +3.3V and +2.5V. For -5V monitoring, select MAX6339MUT or MAX6339NUT variants; the MAX6339KUT+T pinout and internal circuitry exclude negative rail capability.
Is an external pullup resistor required for the RESET output of the MAX6339KUT+T?
No external pullup resistor is required for the MAX6339KUT+T RESET output when interfacing with logic referenced to the same IN2 supply (e.g., +3.3V MCU), thanks to its 10µA internal pullup to IN2. An external pullup is needed only when driving logic with a different supply voltage (e.g., +5V or +1.8V), as stated in the Applications Information section of the MAX6339KUT+T datasheet.
What is the minimum supply voltage required for the MAX6339KUT+T to assert a valid RESET signal?
The MAX6339KUT+T guarantees RESET functionality as long as either IN1 ≥ 1.0V or IN2 ≥ 1.0V - this is explicitly specified in Note 3 of the Electrical Characteristics table and confirmed in the Detailed Description. Below 1.0V on both pins, RESET behavior is undefined.
How does the MAX6339KUT+T handle short-duration supply transients on monitored inputs?
The MAX6339KUT+T rejects transients ≤100µs in duration when the input deviates by ≥50mV from its threshold, as validated in Figure MAX6339toc04 (Maximum IN_ Transient Duration vs. Reset Threshold Overdrive). This built-in glitch immunity prevents false resets in electrically noisy environments such as switch-mode power supply outputs.
MAX6339KUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 2.19V, 2.93V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6339KUT+T FAQ
1.How can I place an order for MAX6339KUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6339KUT+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 MAX6339KUT+T reliable?
The price and inventory of MAX6339KUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6339KUT+T is usually 5 days.
3.What payment methods are accepted for MAX6339KUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6339KUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6339KUT+T?
MAX6339KUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6339KUT+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 MAX6339KUT+T?
For technical support, including MAX6339KUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6339KUT+T requirements.
6.How does Aetrix verify that MAX6339KUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6339KUT+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 MAX6339KUT+T meets industry standards.
7.What is the process for return or replacement of MAX6339KUT+T?
All MAX6339KUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6339KUT+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 MAX6339KUT+T part is unused and in its original packaging.
Return procedure for MAX6339KUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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