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Analog Devices Inc./Maxim Integrated MAX6339KUT
- Part No.:
- MAX6339KUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6339KUT.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:29,139
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Product details
Overview
MAX6339KUT from Maxim Integrated is a precision quad voltage supervisory IC that monitors four independent 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 monitored voltage falls below its threshold, with 140ms minimum timeout after recovery. Designed for multi-rail embedded systems, it replaces discrete monitoring solutions in telecom and industrial control applications.
For engineers reviewing the MAX6339KUT datasheet, MAX6339KUT pinout, MAX6339KUT application, or MAX6339KUT 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 sub-200µs supply transients-critical for reliable power sequencing in space-constrained designs.
Technical Context
The MAX6339KUT uses an internal 1.23V bandgap reference and four precision comparators with 0.3% hysteresis per channel. Its dual adjustable inputs (IN1 and IN4) accept external resistor-divider networks to set custom thresholds, while IN2 and IN3 are factory-trimmed for +3.3V and +2.5V monitoring at ±10% tolerance.
Power is derived solely from IN2, enabling self-powered supervision of up to four rails without auxiliary bias. The RESET output remains valid down to IN1 ≥ 1V or IN2 ≥ 1V, and features a weak 10µA internal pullup to IN2-eliminating external pullups in many 3.3V logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input | Powered only from IN2 (1.0V to 5.5V); no separate VCC required |
| Monitored Voltages | IN1 & IN4: user-adjustable (1.23V internal reference); IN2 = +3.3V ±10%; IN3 = +2.5V ±10% |
| Reset Timeout | 140ms minimum delay after all inputs recover-ensures stable system boot before release |
| Quiescent Current | 55µA typical-enables always-on supervision in low-power battery-backed systems |
| Input Hysteresis | 0.3% of threshold-rejects noise without compromising accuracy during rail settling |
| Transient Immunity | Rejects input glitches <200µs (at 50mV overdrive)-prevents false resets during switching noise |
| Operating Temp | -40°C to +85°C-qualified for industrial and telecom infrastructure environments |
Pinout & Package
MAX6339KUT is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts and reflow-compatible assembly.
| 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, 4.0V) |
| 2 - IN2 | Power-supply input & fixed monitor | Supplies device core; simultaneously monitors +3.3V ±10%; RESET valid if IN2 ≥ 1V |
| 3 - IN3 | Fixed-voltage monitor input | Factory-trimmed for +2.5V ±10%; requires no external components |
| 4 - IN4 | User-adjustable monitor input | Second adjustable input-supports dual-custom-rail supervision (e.g., +1.2V and +3.3V) |
| 5 - GND | Analog/digital ground reference | Single ground pin shared across all comparators and reference circuitry |
| 6 - RESET | Active-low open-drain reset output | Pulled internally to IN2 (10µA); compatible with 1.8V–5.5V logic; no external pullup needed for 3.3V systems |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable monitoring inputs | IN1 and IN4 each use 1.23V internal reference-enables precise custom thresholds without trimming resistors |
| No external components for fixed rails | +3.3V (IN2) and +2.5V (IN3) monitoring require zero external parts-reduces BOM count and layout area |
| Guaranteed reset validity at low supply | RESET remains functional even if IN1 or IN2 drops to 1.0V-critical for brown-out detection during power ramp-down |
| Transient-immune comparator design | Rejects supply glitches <200µs-avoids spurious resets in noisy DC/DC converter or motor-drive environments |
| Low-impedance reference path | Bandgap reference and comparators share common bias-ensures stable threshold tracking across temperature (-40°C to +85°C) |
Applications
| Telecom Line Cards | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring +3.3V FPGA core, +2.5V I/O bank, +1.2V analog front-end, and -5V legacy interface on a dense line card. IC Role / Device Role / Timing Role: Quad supervisor ensures synchronized reset assertion across all rails before FPGA configuration begins. Use Value: Eliminates four discrete supervisors and associated passives-saves >12 mm² PCB area and improves MTBF by reducing component count. |
Use Scenario: Supervising +24V field power, +5V controller logic, +3.3V communication interface, and adjustable +12V sensor bias in an IP67-rated PLC module. IC Role / Device Role / Timing Role: IN1 and IN4 configured via resistor dividers to monitor non-standard rails (+12V, +24V); IN2/IN3 cover logic supplies. Use Value: Single-chip solution supports mixed-voltage supervision without custom ASIC or FPGA logic-reducing firmware complexity and qualification effort. |
| Network Attached Storage (NAS) | Medical Diagnostic Imaging Controllers |
|
Use Scenario: Validating +12V HDD spindle, +5V SATA PHY, +3.3V SoC, and adjustable +1.8V memory interface in fanless NAS enclosures. IC Role / Device Role / Timing Role: Asserts unified RESET only after all rails stabilize-prevents partial initialization and data corruption during cold start. Use Value: 140ms timeout aligns with HDD spin-up timing; 55µA current enables always-on monitoring without impacting standby power budget. |
Use Scenario: Ensuring clean power-up of +5V analog acquisition, +3.3V digital processing, +2.5V ADC reference, and adjustable +4.0V laser driver in MRI subsystem controllers. IC Role / Device Role / Timing Role: Dual adjustable inputs verify proprietary bias rails; fixed inputs validate standard logic supplies before safety-critical sequences begin. Use Value: 0.3% hysteresis prevents oscillation near threshold-essential for stable operation in EMI-heavy imaging environments. |
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 | Same pinout, identical IN2/IN3 thresholds, but IN1/IN4 thresholds trimmed to ±5% (not ±10%) | Better accuracy for tight-tolerance rails; higher cost and longer lead time | Select MAX6340KUT only if ±5% threshold tolerance is required for IN1/IN4-otherwise MAX6339KUT offers optimal cost/performance balance. |
| TPS3307-33D | Triple-monitor (not quad); fixed +3.3V, +5V, +3.3V outputs; no adjustable inputs; 200ms timeout | Lacks fourth rail and user-adjustability-requires supplemental circuitry for full quad coverage | Use TPS3307-33D only in 3-rail systems where IN4 is unused; MAX6339KUT is mandatory when four independent rails must be supervised. |
Compared with MAX6340KUT and TPS3307-33D, the MAX6339KUT uniquely delivers dual adjustable inputs within a quad-monitor SOT23-6 footprint at ±10% tolerance-making it the only drop-in solution for cost-sensitive, space-constrained designs requiring flexible rail coverage.
Availability
MAX6339KUT is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial PLCs, and network-attached storage systems requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6339KUT 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications-emphasizing reliability, integration, and thermal robustness.
The MAX6339KUT belongs to Maxim's µP supervisory product line, engineered specifically for compact, multi-rail power integrity in space-constrained embedded systems-replacing discrete monitoring networks with guaranteed timing and noise immunity.
FAQ
What voltage thresholds does the MAX6339KUT monitor by default?
The MAX6339KUT monitors +3.3V (IN2) and +2.5V (IN3) with ±10% factory-trimmed thresholds. IN1 and IN4 are user-adjustable using external resistor dividers referenced to the internal 1.23V threshold-enabling custom monitoring of voltages such as +1.2V, +4.0V, or -5V. No fixed values are assigned to IN1/IN4; their thresholds depend entirely on the external network selected by the designer.
Can the MAX6339KUT operate if IN2 drops below 3.3V?
Yes-the MAX6339KUT operates from IN2 over 1.0V to 5.5V. Its RESET output remains valid as long as IN1 ≥ 1V or IN2 ≥ 1V, and internal circuitry guarantees correct reset assertion even during brown-out conditions. This allows the MAX6339KUT to supervise systems where IN2 is a variable or marginally regulated rail-such as a buck converter output under load transient.
Is an external pullup resistor required for the MAX6339KUT RESET output?
No-an external pullup is not required in most cases. The MAX6339KUT includes a 10µA internal pullup to IN2, which is sufficient to drive standard 3.3V CMOS inputs. An external pullup is only needed when interfacing with logic operating at voltages outside IN2's range (e.g., 1.8V or 5V systems), or when faster rise times are required beyond the 10µA source capability.
How does the MAX6339KUT handle short voltage transients on monitored inputs?
The MAX6339KUT rejects transients shorter than ~200µs (depending on overdrive magnitude), as confirmed by its glitch immunity graph in the datasheet. This behavior stems from internal filtering and comparator hysteresis-not external capacitors-so no additional RC networks are needed to achieve noise immunity in typical switch-mode power supply environments.
What is the maximum input voltage allowed on IN1 and IN4 when configured for adjustable thresholds?
When used as adjustable inputs, IN1 and IN4 tolerate voltages from -0.3V to +6.0V (relative to GND), per Absolute Maximum Ratings. However, for reliable threshold setting, the external resistor-divider must ensure the voltage at the pin stays within 0V to VIN2 (i.e., ≤5.5V). Exceeding VIN2 risks forward-biasing internal ESD diodes and invalidating the 1.23V reference relationship.
MAX6339KUT 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:
- 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-23-6
MAX6339KUT FAQ
1.How can I place an order for MAX6339KUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6339KUT 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 reliable?
The price and inventory of MAX6339KUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6339KUT is usually 5 days.
3.What payment methods are accepted for MAX6339KUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6339KUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6339KUT?
MAX6339KUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6339KUT 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?
For technical support, including MAX6339KUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6339KUT requirements.
6.How does Aetrix verify that MAX6339KUT is sourced from the original manufacturer or authorized distributors?
All MAX6339KUT 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 meets industry standards.
7.What is the process for return or replacement of MAX6339KUT?
All MAX6339KUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6339KUT, 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 part is unused and in its original packaging.
Return procedure for MAX6339KUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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