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Analog Devices Inc./Maxim Integrated MAX6424UK31+
- Part No.:
- MAX6424UK31+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6424UK31+.pdf
- Description:
- MAX6424 LOW-POWER, SOT MICROPROC
- Quantity:
- Payment:
- Shipping:
Inventory:4,875
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Product details
Overview
MAX6424UK31+ from Maxim Integrated is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-low push-pull RESET signal when voltage falls below 3.075V (typical), with capacitor-adjustable reset timeout, guaranteed operation down to VCC = 1V, and 1.6µA typical quiescent current - used for reliable power-on reset in battery-powered embedded controllers.
For engineers reviewing the MAX6424UK31+ datasheet, MAX6424UK31+ pinout, MAX6424UK31+ application, or MAX6424UK31+ equivalent, key selection criteria include its SOT23-5 package, 3.075V reset threshold, push-pull output drive capability, capacitor-set timeout delay, and compatibility with industrial temperature range (-40°C to +125°C) designs.
Technical Context
The MAX6424UK31+ implements a precision voltage monitor with laser-trimmed resistive divider and internal 0.65V reference, comparing VCC against a factory-set 3.075V threshold (±2.5% over temperature). Its reset assertion logic is triggered by VCC falling below threshold and held for a user-defined timeout period determined by external capacitor on SRT pin.
A 240nA internal current source charges the SRT capacitor; reset deassertion occurs when capacitor voltage ramps to 0.65V. The push-pull RESET output drives low to ≤0.4V at 3.2mA sink (VCC ≥ 4.5V) and high to ≥0.8×VCC at 800µA source, ensuring robust interface with µP reset inputs across supply voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (typ), ±2.5% over -40°C to +125°C - ensures reliable brownout detection for 3.3V systems |
| Quiescent Current | 1.6µA (typ) at VCC ≤ 2.0V - enables multi-year battery life in portable equipment |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup and supports direct µP reset input drive |
| Reset Timeout Range | 275µs to >10ms via 0–15nF SRT capacitor - accommodates wide range of µP reset timing requirements |
| VCC Operating Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout conditions |
| VCC to RESET Delay | 80µs (typ) with 1mV/µs VCC fall rate - provides fast response to supply collapse |
| Hysteresis | 4 × VTH (≈12.3mV) - prevents chatter near threshold during slow VCC transitions |
Pinout & Package
MAX6424UK31+ is housed in a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and available in lead-free (+T) variant. Pin 3 is internally unconnected (N.C.) and may be tied to GND per layout best practice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input - connects to external capacitor to ground; 240nA ramp current sets timeout period |
| 2 | GND | Ground reference for all internal circuitry and RESET output stage |
| 3 | N.C. | Not internally connected - recommended to tie to GND for mechanical stability and noise immunity |
| 4 | VCC | Supply voltage input and monitored rail - powers device and defines reset threshold reference |
| 5 | RESET | Active-low push-pull output - drives µP reset pin directly; sinks up to 3.2mA, sources up to 800µA |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific reset hold time (275µs minimum) without firmware or external logic |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior during deep undervoltage events where most supervisors fail |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - reduces false resets in noisy environments |
| Low-leakage SRT pin design | Minimizes timeout error from PCB leakage; requires short trace and no nearby high-speed signals |
| Factory-trimmed reset threshold | 3.075V nominal (suffix "31") with ±2.5% tolerance over full temperature range - eliminates calibration overhead |
Applications
| Portable Medical Sensors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Wearable ECG sensor operating from coin-cell battery with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and asserts RESET during battery sag below 3.075V to prevent corrupted memory writes. Use Value: 1.6µA quiescent current extends battery life; capacitor-adjustable timeout aligns precisely with µP boot sequence. |
Use Scenario: Remote RTU monitoring pipeline pressure using LoRaWAN, powered by solar-charged Li-ion. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and holds µP in reset until stable after cold-start or solar intermittency. Use Value: Valid RESET down to VCC = 1V prevents spurious wakeups during partial charge; push-pull output ensures clean reset edge. |
| Automotive Body Control Modules | Smart Energy Metering Hardware |
Use Scenario: Door module powered from vehicle battery subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: Detects VCC drop during engine cranking and initiates controlled shutdown/reset of MCU subsystems. Use Value: Immunity to ≤50µs transients avoids false resets; -40°C to +125°C rating meets AEC-Q100 ambient requirements. |
Use Scenario: Revenue-grade electricity meter with isolated MCU and metrology ASIC requiring synchronized power-up. IC Role / Device Role / Timing Role: Generates precise, adjustable reset pulse to coordinate initialization of dual-core processor and ADC. Use Value: External capacitor sets 5ms timeout matching ASIC power-rail stabilization time; SOT23-5 footprint saves board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN30T1G | Fixed 3.0V threshold (±2%), 1.1µA IQ, open-drain RESET, SOT23-5 | Lacks capacitor-adjustable timeout; requires external pullup; lower IQ but no timeout flexibility | Choose for ultra-low-power apps where fixed 3.0V threshold and minimal BOM count outweigh timeout adjustability |
| TPS3808G33DBVR | Fixed 3.3V threshold (±0.5%), 1.5µA IQ, push-pull RESET, SOT23-6 | Higher accuracy and lower drift, but fixed timeout (200ms typ), larger 6-pin package | Choose when tight threshold tolerance and long fixed timeout are critical, and extra pin is acceptable |
Compared with MAX6424UK31+, NCP302LSN30T1G offers lower quiescent current but sacrifices timeout adjustability and requires pullup; TPS3808G33DBVR delivers superior threshold accuracy and longer fixed timeout but uses a larger package and lacks capacitor-based tuning - MAX6424UK31+ uniquely balances adjustability, push-pull drive, and compact SOT23-5 form factor.
Availability
MAX6424UK31+ is available at Aetrix Electronics and suitable for battery-powered medical devices, automotive body electronics, industrial RTUs, and smart metering hardware requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6424UK31+ 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 computing applications, emphasizing reliability, low power, and integration.
The MAX6424UK31+ belongs to the MAX6340/MAX6421–MAX6426 family of low-power µP supervisors, engineered specifically for robust reset generation in space-constrained, battery-sensitive, and thermally harsh embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6424UK31+?
The MAX6424UK31+ has a nominal reset threshold of 3.075V, with ±2.5% tolerance over the full operating temperature range (-40°C to +125°C). This value is factory-laser-trimmed and corresponds to the "31" suffix in the part number, per Table 1 of the datasheet.
Does MAX6424UK31+ support capacitor-adjustable reset timeout, and how is it calculated?
Yes, MAX6424UK31+ supports capacitor-adjustable reset timeout via the SRT pin. The timeout period tRP (in seconds) is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the capacitor value in farads. For example, a 1500pF capacitor yields ~4.375ms timeout.
What is the function of Pin 3 (N.C.) on MAX6424UK31+?
Pin 3 of MAX6424UK31+ is Not Connected (N.C.) internally. Though unused electrically, Maxim recommends tying it to GND to improve mechanical stability, reduce parasitic coupling, and enhance noise immunity in high-density layouts.
Can MAX6424UK31+ operate reliably when VCC drops below 1.8V?
Yes, MAX6424UK31+ guarantees valid RESET assertion and deassertion down to VCC = 1.0V. Its internal reference and comparator remain functional, and the push-pull output maintains specified VOL and VOH performance even at 1V supply - critical for brownout resilience.
Is MAX6424UK31+ pin-compatible with other members of the MAX642x family?
MAX6424UK31+ shares the same 5-pin SOT23-5 package and pinout with MAX6340, MAX6425UKxx+, and MAX6426UKxx+, but differs from MAX6421/MAX6422/MAX6423 (4-pin SC70/SOT143). Its push-pull RESET output matches MAX6421/MAX6422, unlike open-drain variants.
MAX6424UK31+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 3ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6424UK31+ FAQ
1.How can I place an order for MAX6424UK31+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6424UK31+ 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 MAX6424UK31+ reliable?
The price and inventory of MAX6424UK31+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6424UK31+ is usually 5 days.
3.What payment methods are accepted for MAX6424UK31+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6424UK31+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6424UK31+?
MAX6424UK31+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6424UK31+ 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 MAX6424UK31+?
For technical support, including MAX6424UK31+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6424UK31+ requirements.
6.How does Aetrix verify that MAX6424UK31+ is sourced from the original manufacturer or authorized distributors?
All MAX6424UK31+ 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 MAX6424UK31+ meets industry standards.
7.What is the process for return or replacement of MAX6424UK31+?
All MAX6424UK31+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6424UK31+, 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 MAX6424UK31+ part is unused and in its original packaging.
Return procedure for MAX6424UK31+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6424UK31+ Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
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V6340RSP3B+
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EM6325CXSP5B-2.9+
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MCP120T-300I/TT
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MCP130T-315I/TT
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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