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Analog Devices Inc./Maxim Integrated MAX6424UK44+T
- Part No.:
- MAX6424UK44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6424UK44+T.pdf
- Description:
- IC MPU/RESET CIRC 4.375V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,572
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Product details
Overview
MAX6424UK44+T from Analog Devices is a low-power microprocessor supervisor IC with active-low push-pull reset output, 4.375V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), and guaranteed operation down to VCC = 1V. It monitors system supply voltage in portable, battery-powered, and automotive applications to prevent erroneous code execution during power-up, brownout, or power-down.
For engineers reviewing the MAX6424UK44+T datasheet, MAX6424UK44+T pinout, MAX6424UK44+T application, or MAX6424UK44+T equivalent, key selection criteria include its SOT23-5 package, 1.6µA typical quiescent current, 80µs VCC-to-reset delay, open-drain compatibility via internal push-pull drive, and immunity to sub-50µs VCC transients exceeding 100mV below threshold.
Technical Context
The MAX6424UK44+T implements a precision voltage-detection architecture using laser-trimmed resistors to set its 4.375V reset threshold, with ±2.5% accuracy across –40°C to +125°C. Its reset assertion logic is triggered when VCC falls below VTH, and deassertion is delayed by an internal 240nA current source charging an external SRT capacitor to a 0.65V ramp threshold.
This device operates as a dedicated single-function supervisor - not a watchdog or window monitor - and guarantees valid reset signaling even as VCC declines to 1V. Its push-pull output drives directly into CMOS inputs without external pull-ups, distinguishing it from open-drain variants like MAX6425UK44+T.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.375V nominal (suffix "44"), ±2.5% over –40°C to +125°C - sets precise brownout detection point for 4.5V systems |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring circuits |
| Reset Timeout | 4.375ms typical with 1500pF SRT capacitor - ensures µP reset hold time exceeds boot ROM initialization |
| VCC to Reset Delay | 80µs maximum - responds rapidly to fast VCC droops without false triggering on noise |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor; sinks 3.2mA at VCC ≥ 4.5V |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial embedded use |
Pinout & Package
MAX6424UK44+T is housed in a 5-pin SOT23-5 package (package code U5+2, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for thermal enhancement. Pin 1 is marked with a dot; pin order is standard SOT23-5 configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply input and monitored voltage rail - must be decoupled locally; powers internal reference and comparator |
| 2 | GND | Analog ground reference - connects to system ground plane; critical for accurate threshold sensing |
| 3 | SRT | Set-reset-time input - accepts external capacitor (CSRT) to program timeout; sensitive to leakage and stray capacitance |
| 4 | RESET | Active-low push-pull reset output - drives µP reset pin directly; sinks up to 3.2mA at 4.5V |
| 5 | N.C. | No internal connection - must be left floating or tied to GND per layout best practice; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise timing tuning (275µs to >10ms) via single external capacitor - avoids fixed-delay limitations of non-programmable supervisors |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic behavior during deep undervoltage events where other supervisors fail silently |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - prevents spurious resets in noisy power environments |
| Low 1.6µA quiescent current | Minimizes battery drain in always-on monitoring - supports >10-year shelf life in coin-cell-powered IoT nodes |
| Factory-laser-trimmed threshold | Delivers ±2.5% accuracy over full temperature range without calibration - reduces BOM count and test overhead |
Applications
| Automotive Body Control Module | Portable Medical Monitor |
|---|---|
|
Use Scenario: Monitors 5V supply rail powering MCU and sensor interface in door module, asserting reset during engine cranking-induced brownout. IC Role / Device Role / Timing Role: Voltage supervisor providing fault-tolerant reset signal with 4.375V threshold and 4.375ms timeout - matches MCU's minimum reset pulse width requirement. Use Value: Prevents firmware corruption during 12V battery dip to 6.5V; push-pull output ensures immediate release without pull-up RC delay. |
Use Scenario: Ensures reliable startup of ARM Cortex-M4-based vital signs analyzer powered by single Li-ion cell with buck-boost regulator. IC Role / Device Role / Timing Role: Brownout detector for regulated 4.5V domain, asserting reset if input drops below 4.375V - aligned with regulator dropout specification. Use Value: 1.6µA supply current extends battery runtime; guaranteed operation to 1V allows clean shutdown before system collapse. |
| Industrial PLC I/O Subsystem | Set-Top Box Power Sequencing |
|
Use Scenario: Supervises isolated 3.3V logic rail in DIN-rail mounted controller exposed to wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: High-accuracy voltage monitor with ±2.5% threshold tolerance over temperature - eliminates need for recalibration across operating range. Use Value: Prevents erratic I/O state transitions during cold-start; SOT23-5 package fits dense PCB layouts with minimal area penalty. |
Use Scenario: Coordinates power-up sequence between SoC, DDR memory, and tuner IC in consumer STB with multi-rail DC/DC architecture. IC Role / Device Role / Timing Role: Primary reset generator for main 1.2V/3.3V/5V rails, using capacitor-adjustable timeout to match slowest power rail stabilization time. Use Value: Eliminates discrete RC network; 80µs VCC-to-reset delay ensures prompt response to upstream supply faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302HSN43T1G | Fixed 4.3V threshold, no capacitor-adjustable timeout; 1.5µA IQ; SOT23-5 | Lacks programmable reset delay - requires matching fixed timeout to system requirements | Choose when design prioritizes lowest cost and fixed timing suffices |
| MC33464D-4.35D | 4.35V threshold, open-drain output, 1.8µA IQ, SOT23-5 | Requires external pull-up; less immune to VCC transients (no transient rejection spec) | Choose only if open-drain interface is mandatory and transient immunity is secondary |
Compared with NCP302HSN43T1G and MC33464D-4.35D, MAX6424UK44+T uniquely combines factory-trimmed 4.375V accuracy, capacitor-programmable timeout, push-pull drive, and documented 50µs transient immunity - making it optimal for designs requiring timing flexibility and robustness in variable-voltage environments.
Availability
MAX6424UK44+T is available at Aetrix Electronics and suitable for automotive body control modules, portable medical monitors, and industrial PLC subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6424UK44+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX6424UK44+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power microprocessor supervisors, designed specifically for reliable power-monitoring in space-constrained, battery-sensitive, and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6424UK44+T?
The MAX6424UK44+T has a nominal reset threshold of 4.375V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value is laser-trimmed at wafer sort and confirmed in the Electrical Characteristics table under VTH parameter with suffix "44" corresponding to Table 1 entry.
Does MAX6424UK44+T require an external pull-up resistor on the RESET pin?
No, MAX6424UK44+T features an active-low push-pull RESET output and does not require an external pull-up resistor. Its output can directly drive CMOS reset inputs; VOL is specified at 0.3V max with 3.2mA sink current at VCC ≥ 4.5V, ensuring solid logic-low assertion without additional components.
How do I calculate the SRT capacitor value for a 6ms reset timeout with MAX6424UK44+T?
Use the formula CSRT = (tRP – 275µs) / 2.735 × 10⁶, where tRP is in seconds. For 6ms: CSRT = (0.006 – 0.000275) / 2,735,000 ≈ 2095pF. Select a low-leakage ceramic capacitor (X7R or C0G) rated ≥6.3V; 2.2nF is a practical standard value yielding ~6.1ms timeout.
Is MAX6424UK44+T qualified for automotive applications?
While MAX6424UK44+T shares the same –40°C to +125°C operating range and SOT23-5 package as AEC-Q100-qualified variants (e.g., MAX6340UK31/V+T), the MAX6424UK44+T itself is not explicitly AEC-Q100 certified per the datasheet revision history and ordering information. Use only in automotive applications after completing full qualification per OEM requirements.
Can MAX6424UK44+T operate with a 1.8V supply rail?
Yes, MAX6424UK44+T operates from VCC = 1.0V to 5.5V and guarantees valid RESET output down to VCC = 1V. At 1.8V, its quiescent current is 1.9µA (typ), reset threshold remains 4.375V (so it will assert reset immediately), and VOL is 0.3V max with 500µA sink - confirming functional integrity across the full voltage range.
MAX6424UK44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.375V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6424UK44+T FAQ
1.How can I place an order for MAX6424UK44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6424UK44+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 MAX6424UK44+T reliable?
The price and inventory of MAX6424UK44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6424UK44+T is usually 5 days.
3.What payment methods are accepted for MAX6424UK44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6424UK44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6424UK44+T?
MAX6424UK44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6424UK44+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 MAX6424UK44+T?
For technical support, including MAX6424UK44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6424UK44+T requirements.
6.How does Aetrix verify that MAX6424UK44+T is sourced from the original manufacturer or authorized distributors?
All MAX6424UK44+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 MAX6424UK44+T meets industry standards.
7.What is the process for return or replacement of MAX6424UK44+T?
All MAX6424UK44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6424UK44+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 MAX6424UK44+T part is unused and in its original packaging.
Return procedure for MAX6424UK44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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