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Analog Devices Inc./Maxim Integrated MAX6424UK31+T
- Part No.:
- MAX6424UK31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6424UK31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,654
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Product details
Overview
MAX6424UK31+T from Analog Devices 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 threshold). It features capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), 1.6µA typical quiescent current, guaranteed reset validity down to VCC = 1V, and operates across –40°C to +125°C. It is used in battery-powered controllers and automotive ECUs for reliable power-on reset sequencing.
For engineers reviewing the MAX6424UK31+T datasheet, MAX6424UK31+T pinout, MAX6424UK31+T application, or MAX6424UK31+T equivalent, key selection criteria include its 3.075V reset threshold accuracy (±2.5% over temperature), SOT23-5 package compatibility with NCP300–NCP303 and MC33464/MC33465, and push-pull output drive capability without external pullup.
Technical Context
The MAX6424UK31+T implements a precision voltage-detection comparator with laser-trimmed internal resistors to set its 3.075V nominal reset threshold. Its reset timeout is generated by a 240nA internal ramp current charging an external capacitor (SRT-to-GND), with deassertion triggered at 0.65V.
It uses BiCMOS process technology and integrates hysteresis (4×VTH) to prevent chatter during slow VCC transitions. The push-pull RESET output drives high/low actively - no external pullup required - and remains valid over full VCC range (1.0V to 5.5V) and industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (typ), ±2.5% over –40°C to +125°C - ensures deterministic reset assertion across automotive/industrial thermal environments |
| Quiescent Current | 1.6µA (typ) at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered portable systems |
| Reset Timeout | 3.00–5.75ms (with CSRT = 1500pF) - configurable via external capacitor to match µP reset timing requirements |
| Supply Range | 1.0V to 5.5V - supports operation during brownout and low-VCC conditions where other supervisors fail |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and reduces BOM count |
| VCC to RESET Delay | 80µs (VCC falling at 1mV/µs) - provides fast response to supply collapse without false triggering on transients |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial embedded applications |
Pinout & Package
MAX6424UK31+T is housed in a 5-pin SOT23-5 package (package code U5+2), RoHS-compliant, tape-and-reel format. Pin 1 = SRT (Set Reset Timeout), Pin 2 = GND, Pin 3 = RESET (active-low push-pull), Pin 4 = GND, Pin 5 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SRT) | Capacitor-adjustable timeout input | Connects to external timing capacitor; 240nA internal current source charges it to 0.65V to determine reset hold time |
| 2 (GND) | Ground reference | Primary return path for internal circuitry and RESET output sink current |
| 3 (RESET) | Active-low push-pull reset output | Drives µP reset input directly; sinks up to 3.2mA at VCC ≥ 4.5V, no pullup needed |
| 4 (GND) | Second ground terminal | Reduces ground impedance and improves noise immunity in high-noise environments |
| 5 (VCC) | Supply and voltage monitor input | Monitors system rail; reset asserted when VCC drops below 3.075V ±2.5%; valid down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise timing alignment with diverse µP reset requirements using a single external capacitor (CSRT) |
| Guaranteed reset validity to VCC = 1V | Ensures clean, deterministic reset assertion even during deep brownout - critical for automotive safety-critical subsystems |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - prevents spurious resets in noisy power domains |
| Low 1.6µA quiescent current | Extends battery life in always-on monitoring applications such as telematics and sensor nodes |
| Push-pull RESET output | Eliminates external pullup resistor, simplifies layout, and guarantees logic-level compatibility across 1.0–5.5V supply rails |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Glucose Monitor |
|---|---|
Use Scenario: Monitors 3.3V main supply during cold cranking and load dump events in engine control modules. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout detection with 3.075V threshold aligned to MCU VDD tolerance. Use Value: Prevents erratic MCU behavior during transient supply dips; push-pull output ensures immediate reset release without RC delay. | Use Scenario: Ensures safe startup and fault recovery in battery-powered handheld glucose meters with Li-ion supply. IC Role / Device Role / Timing Role: Low-current supervisor asserting reset until stable 3.0V rail is established post-battery insertion. Use Value: 1.6µA ICC extends shelf life and operational runtime; capacitor-adjustable timeout accommodates varying MCU boot sequences. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Supervises isolated 5V auxiliary supply powering communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: High-temperature–rated supervisor (–40°C to +125°C) detecting undervoltage on isolated DC-DC output. Use Value: Guaranteed operation at full temperature range avoids field failures; dual GND pins reduce ground bounce in noisy industrial environments. | Use Scenario: Provides secure, glitch-immune reset for metrology SoC during AC line interruptions and capacitor discharge decay. IC Role / Device Role / Timing Role: Brownout detector with 50µs transient immunity preventing false resets during zero-crossing disturbances. Use Value: Immunity to short transients ensures uninterrupted metering accuracy; open-drain alternatives excluded due to need for active drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN30T1G | Fixed 3.0V threshold (±1.5%), 0.9µA ICC, open-drain output, no adjustable timeout | Lacks capacitor-programmable delay; requires external pullup; lower quiescent current but less flexible timing | Select when fixed timing and ultra-low ICC outweigh need for timeout tuning |
| MC33464D-30SEFR2 | 3.0V threshold (±2.5%), 1.5µA ICC, push-pull output, fixed 200ms timeout (non-adjustable) | Fixed long timeout unsuitable for fast-boot µPs; same package but incompatible SRT pin function | Choose only if system requires long, fixed reset hold time and SRT pin is unused |
Compared with NCP302LSN30T1G and MC33464D-30SEFR2, MAX6424UK31+T uniquely combines adjustable timeout, push-pull drive, and 3.075V threshold with automotive-grade temperature range - enabling precise, low-BOM-count reset control where timing flexibility and active drive are mandatory.
Availability
MAX6424UK31+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, and industrial PLC modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6424UK31+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.
The MAX6424UK31+T belongs to the MAX6340/MAX6421–MAX6426 family of low-power µP supervisors designed specifically for robust, capacitor-tunable reset generation in space-constrained, battery-sensitive, and thermally demanding applications.
FAQ
What is the exact reset threshold voltage of MAX6424UK31+T?
The MAX6424UK31+T has a nominal reset threshold of 3.075V, with guaranteed accuracy of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed at wafer test and confirmed per Table 1 in the datasheet, where suffix "31" corresponds to min/typ/max values of 2.998V/3.075V/3.152V.
Does MAX6424UK31+T require an external pullup resistor on the RESET pin?
No, MAX6424UK31+T does not require an external pullup resistor because it features an active-low push-pull RESET output. The internal driver actively pulls low and sources current to pull high - ensuring valid logic levels across VCC = 1.0V to 5.5V without external components.
How is the reset timeout period set for MAX6424UK31+T?
The reset timeout period for MAX6424UK31+T is set by connecting an external capacitor (CSRT) between the SRT pin and GND. With CSRT = 1500pF, tRP = 3.00–5.75ms; the relationship is tRP = (2.73 × 10⁶ × CSRT) + 275µs, where CSRT is in farads and tRP in seconds. Ceramic capacitors with leakage <10nA are recommended.
Is MAX6424UK31+T qualified for automotive applications?
While MAX6424UK31+T shares the same package, temperature range (–40°C to +125°C), and design platform as AEC-Q100–qualified variants like MAX6340UK31/V+T, the MAX6424UK31+T itself is not explicitly AEC-Q100 certified per the datasheet. For automotive safety-critical use, confirm qualification status with Analog Devices or select the /V+T variant.
Can MAX6424UK31+T operate reliably below 1.6V supply voltage?
Yes, MAX6424UK31+T is specified to operate down to VCC = 1.0V and guarantees valid RESET output functionality to VCC = 1.0V. Its internal comparator and ramp circuit remain functional at this level, enabling brownout detection in ultra-low-voltage systems where other supervisors cease operation.
MAX6424UK31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- 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
MAX6424UK31+T FAQ
1.How can I place an order for MAX6424UK31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6424UK31+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 MAX6424UK31+T reliable?
The price and inventory of MAX6424UK31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6424UK31+T is usually 5 days.
3.What payment methods are accepted for MAX6424UK31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6424UK31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6424UK31+T?
MAX6424UK31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6424UK31+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 MAX6424UK31+T?
For technical support, including MAX6424UK31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6424UK31+T requirements.
6.How does Aetrix verify that MAX6424UK31+T is sourced from the original manufacturer or authorized distributors?
All MAX6424UK31+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 MAX6424UK31+T meets industry standards.
7.What is the process for return or replacement of MAX6424UK31+T?
All MAX6424UK31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6424UK31+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 MAX6424UK31+T part is unused and in its original packaging.
Return procedure for MAX6424UK31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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