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Analog Devices Inc./Maxim Integrated MAX6424UK33+T
- Part No.:
- MAX6424UK33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6424UK33+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,502
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Product details
Overview
MAX6424UK33+T from Analog Devices is a low-power microprocessor supervisor IC that monitors 3.3V system supply rails and asserts an active-low push-pull reset signal when VCC falls below 3.30V (±2.5% over temperature). It features capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), 1.6µA typical quiescent current, and guaranteed reset validity down to VCC = 1V. It is used in battery-powered embedded controllers to prevent code execution errors during brownout.
For engineers reviewing the MAX6424UK33+T datasheet, MAX6424UK33+T pinout, MAX6424UK33+T application, or MAX6424UK33+T equivalent, key selection criteria include its 3.3V reset threshold accuracy, SOT23-5 push-pull output drive capability, capacitor-programmable timeout, and AEC-Q100-compatibility path via family qualification.
Technical Context
The MAX6424UK33+T implements a precision voltage detector with laser-trimmed internal reference and hysteresis (4×VTH), coupled to a 240nA current source that charges an external capacitor on the SRT pin. Reset deassertion occurs only after the capacitor voltage ramps to 0.65V, enabling accurate, temperature-stable timeout control independent of VCC.
Its 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, eliminating need for external pull-up resistors. The device operates across –40°C to +125°C and maintains functional reset assertion down to VCC = 1V, supporting robust power sequencing in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.30V ±2.5% over –40°C to +125°C - ensures reliable brownout detection at nominal 3.3V rail |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered systems |
| Reset Timeout | 4.375ms typ with 1500pF SRT capacitor - matches common µP reset hold-time requirements |
| Output Type | Active-low push-pull - provides direct logic-level drive without external pull-up components |
| VCC Range | 1.0V to 5.5V - supports valid reset assertion during deep undervoltage conditions |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
| VCC to Reset Delay | 80µs max - fast response to supply collapse prevents spurious processor execution |
Pinout & Package
MAX6424UK33+T is housed in a 5-pin SOT23-5 package (package code U5+2), RoHS-compliant, tape-and-reel format. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (active-low push-pull), Pin 4 is N.C., Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Capacitor-Adjustable Timeout Input | Connects to external timing capacitor; 240nA ramp current sets precise reset delay |
| 2 - GND | Ground Reference | Primary return path for internal circuitry and RESET output stage |
| 3 - RESET | Active-Low Push-Pull Output | Drives µP reset input directly; sinks up to 3.2mA, sources ≥0.8×VCC at 800µA |
| 4 - N.C. | No Internal Connection | Not bonded; may be left floating or tied to GND per layout best practice |
| 5 - VCC | Supply & Voltage Monitor Input | Monitors system rail; powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-Adjustable Reset Timeout | Enables precise, application-tailored reset hold time (275µs to >10ms) using standard ceramic capacitors |
| Guaranteed Reset Validity to VCC = 1V | Ensures deterministic µP reset state even during severe undervoltage events before shutdown |
| Immunity to Short VCC Transients | Rejects <50µs negative glitches ≥100mV below threshold - prevents false resets in noisy environments |
| Low-Leakage SRT Pin Architecture | Minimizes timing error from PCB leakage; supports accurate timeout over full temperature range |
| Push-Pull Output with Rail-to-Rail Drive | Eliminates external pull-up resistor, reduces BOM count, and improves noise margin vs open-drain alternatives |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Portable glucose meters and pulse oximeters powered by single-cell Li-ion batteries experiencing voltage sag during RF transmission. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and asserts RESET if voltage drops below 3.30V during transient load, holding µP in reset until stable supply returns. Use Value: Prevents corrupted sensor readings and firmware crashes during brownout, meeting IEC 60601-1 reliability requirements. |
Use Scenario: Door module ECUs exposed to load dump and cold-crank conditions where 12V supply dips to 6V and 3.3V domain sags below specification. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller supply; triggers 4.375ms reset pulse upon undervoltage to ensure clean boot after recovery. Use Value: Guarantees deterministic restart after electrical stress events, satisfying ISO 16750-2 transient immunity compliance. |
| Industrial PLC I/O Subsystems | Smart Energy Meters |
Use Scenario: Remote I/O nodes operating in unregulated 24V DC environments with long cable runs causing voltage drop and ripple. IC Role / Device Role / Timing Role: Detects sustained 3.3V rail collapse due to upstream regulator failure and holds ARM Cortex-M4 in reset for full timeout period. Use Value: Avoids partial register writes and memory corruption during power instability, preserving data integrity per IEC 61131-2. |
Use Scenario: Meters with dual-supply architecture (3.3V MCU + 5V metrology ASIC) requiring synchronized reset during AC mains interruption. IC Role / Device Role / Timing Role: Monitors 3.3V rail derived from supercapacitor backup; asserts RESET until capacitor recovers above 3.30V. Use Value: Enables seamless switchover between main and backup power without firmware lockup or metering discontinuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN33T1G | Fixed 3.3V threshold, 200ms min timeout, open-drain output, higher ICC (3µA) | Lacks capacitor-adjustable timeout and push-pull drive; requires external pull-up | Choose when long fixed timeout suffices and cost sensitivity outweighs design flexibility |
| TLV803EB33DBZR | 3.3V threshold, 140ms min timeout, push-pull output, higher ICC (4µA), no adjustable timeout | Offers tighter threshold accuracy (±0.5%) but no timeout customization; limited temp range (–40°C to +105°C) | Prefer when absolute threshold precision is critical and timeout is not application-constrained |
Compared with MAX6424UK33+T, NCP302LSN33T1G requires external pull-up and lacks timeout adjustability, while TLV803EB33DBZR trades programmability for tighter threshold tolerance and reduced temperature coverage - making MAX6424UK33+T optimal for designs needing field-tunable reset duration and extended industrial temperature support.
Availability
MAX6424UK33+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and industrial PLC I/O subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6424UK33+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 MAX6421–MAX6426 family was designed specifically for ultra-low-power, capacitor-programmable reset supervision in space- and energy-constrained embedded systems where precision voltage monitoring and flexible timing are essential.
FAQ
What is the exact reset threshold voltage of MAX6424UK33+T and how does it vary with temperature?
The MAX6424UK33+T has a nominal reset threshold of 3.30V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This is confirmed in the Electrical Characteristics table under "VCC Reset Threshold Accuracy" with VTH specified as 3.30V ±2.5% across temperature. The device uses laser-trimmed resistors to achieve this stability.
Does MAX6424UK33+T require an external pull-up resistor on the RESET pin?
No, MAX6424UK33+T does not require an external pull-up resistor because it features an active-low push-pull RESET output. The output actively drives high to ≥0.8×VCC and low to ≤0.4V (at 3.2mA sink), providing full rail-to-rail logic levels without external components - unlike open-drain variants such as MAX6425UK33+T.
How is the reset timeout period set for MAX6424UK33+T, and what capacitor value yields ~4.4ms?
The reset timeout for MAX6424UK33+T is set by connecting a capacitor (CSRT) between the SRT pin and GND. Using the formula tRP = 2.73 × 10⁶ × CSRT + 275µs, a 1500pF capacitor yields a typical timeout of 4.375ms. Ceramic capacitors with leakage <10nA are recommended to maintain accuracy across temperature.
Is MAX6424UK33+T qualified for automotive applications?
While MAX6424UK33+T itself is not individually AEC-Q100 certified, the MAX6340 series (same family, same SOT23-5 package and process) is explicitly AEC-Q100 qualified (e.g., MAX6340UK31/V+T). Analog Devices documents pin compatibility and shared qualification pathways across the MAX6424/MAX6340 family, supporting automotive use with appropriate validation.
What is the minimum supply voltage at which MAX6424UK33+T guarantees valid RESET assertion?
MAX6424UK33+T guarantees valid RESET assertion down to VCC = 1.0V, as stated in the "Guaranteed Reset Valid to VCC = 1V" feature and confirmed in Absolute Maximum Ratings and Electrical Characteristics. Below 1V, output drive capability degrades significantly, so system design must ensure reset initiation occurs above this limit.
MAX6424UK33+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:
- 3.3V
- 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
MAX6424UK33+T FAQ
1.How can I place an order for MAX6424UK33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6424UK33+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 MAX6424UK33+T reliable?
The price and inventory of MAX6424UK33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6424UK33+T is usually 5 days.
3.What payment methods are accepted for MAX6424UK33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6424UK33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6424UK33+T?
MAX6424UK33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6424UK33+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 MAX6424UK33+T?
For technical support, including MAX6424UK33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6424UK33+T requirements.
6.How does Aetrix verify that MAX6424UK33+T is sourced from the original manufacturer or authorized distributors?
All MAX6424UK33+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 MAX6424UK33+T meets industry standards.
7.What is the process for return or replacement of MAX6424UK33+T?
All MAX6424UK33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6424UK33+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 MAX6424UK33+T part is unused and in its original packaging.
Return procedure for MAX6424UK33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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