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Analog Devices Inc./Maxim Integrated MAX6424UK26
- Part No.:
- MAX6424UK26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6424UK26.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,274
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Product details
Overview
MAX6424UK26 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 2.625V (±2.5% over temperature). It features capacitor-adjustable reset timeout (275µs base + 2.73s/F × CSRT), guaranteed operation down to VCC = 1V, and consumes only 1.6µA typical quiescent current. It is used in battery-powered controllers and embedded systems requiring precise brownout protection.
For engineers reviewing the MAX6424UK26 datasheet, MAX6424UK26 pinout, MAX6424UK26 application, or MAX6424UK26 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts for industrial and automotive-grade µP supervision.
Technical Context
The MAX6424UK26 implements a precision bandgap-based voltage detector with laser-trimmed resistors to set its 2.625V reset threshold (suffix "26"). Its internal 240nA ramp current charges an external capacitor on the SRT pin to generate a programmable reset timeout period, independent of VCC.
It uses a push-pull output stage capable of sinking 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V) and sourcing 800µA (VOH ≥ 0.8×VCC), ensuring robust logic-level compatibility with most µP reset inputs without external pull-up components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in portable and remote sensor applications |
| Reset Timeout Base | 275µs minimum (CSRT = 0) - provides guaranteed minimum assertion time even with no external capacitor |
| VCC Operating Range | 1.0V to 5.5V - supports supervision of 1.8V, 2.5V, 3.3V, and 5V rails without external biasing |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and ensures fast, rail-to-rail RESET transitions |
| VCC to RESET Delay | 80µs (VCC falling at 1mV/µs) - provides deterministic response to rapid supply collapse |
| Reset Valid Down To | VCC = 1V - guarantees functional RESET assertion during deep brownout before system power loss |
Pinout & Package
MAX6424UK26 is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Set Reset Timeout Input | Connects to external timing capacitor; 240nA constant current source charges CSRT to generate adjustable timeout (tRP = 2.73×10⁶ × CSRT + 275µs) |
| 2 - GND | Ground Reference | Primary return path for internal circuitry and SRT current sink; must be low-impedance connection to minimize noise coupling |
| 3 - GND | Ground Reference (redundant) | Second ground terminal improves thermal dissipation and reduces ground bounce in noisy environments |
| 4 - RESET | Active-Low Push-Pull Output | Drives µP reset input directly; sinks up to 3.2mA or sources 800µA - no external pull-up required |
| 5 - VCC | Supply & Threshold Monitor Input | Monitors system supply voltage; powers internal circuitry and sets reset threshold via internal resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (e.g., 10ms–1s) to match specific µP power-up requirements without firmware changes |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during severe brownout - critical for fail-safe shutdown in automotive ECUs and medical devices |
| Immunity to short VCC transients | Rejects glitches ≤50µs wide when VCC dips 100mV below threshold - prevents spurious resets in electrically noisy environments |
| Laser-trimmed reset threshold | Delivers ±2.5% accuracy over full temperature range - eliminates need for external calibration or margining in production test |
| Low 1.6µA quiescent current | Reduces standby power by >90% vs. legacy supervisors - extends battery life in always-on IoT nodes and wearables |
Applications
| Automotive Body Control Module | Portable Medical Glucose Meter |
|---|---|
Use Scenario: Monitors 3.3V MCU supply during vehicle ignition transients and load-dump events. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M0+ during brownout. Use Value: Prevents corrupted flash writes and state-machine lockup during 12V battery sag to 6V, with guaranteed reset down to VCC = 1V. |
Use Scenario: Ensures safe startup and shutdown of a battery-powered glucose sensor with BLE radio. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end and 3.3V BLE SoC supply rails. Use Value: 1.6µA quiescent current extends single-CR2032 battery life beyond 2 years in standby mode. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Protects FPGA configuration memory during AC line sags in factory automation equipment. IC Role / Device Role / Timing Role: Generates 100ms reset pulse via 33nF SRT capacitor to meet FPGA power-on reset timing. Use Value: Capacitor-adjustable timeout avoids overdesign - matches exact FPGA TPOR without custom firmware delays. |
Use Scenario: Supervises metrology SoC and RTC during utility grid interruptions lasting seconds. IC Role / Device Role / Timing Role: Detects 2.625V brownout on 3.3V backup rail powered by supercapacitor. Use Value: Tight 2.625V threshold aligns with supercap voltage decay profile - maximizes usable backup energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302HS26T1G | Fixed 2.63V threshold, 200ms factory-set timeout, open-drain output | Requires external pull-up; less flexible timeout tuning; lower max operating temp (+105°C) | Choose for cost-sensitive, space-constrained designs where fixed timeout suffices and push-pull drive is unnecessary |
| TLV803EB26DBZR | 2.63V threshold, 140ms min timeout, push-pull output, 0.5µA IQ | Lower quiescent current but non-adjustable timeout; tighter threshold tolerance (±0.5%) | Prefer when ultra-low power dominates design priority and fixed delay meets µP spec - not for variable-delay systems |
Compared with MAX6424UK26, NCP302HS26T1G lacks timeout adjustability and requires external pull-up, while TLV803EB26DBZR offers lower IQ but sacrifices programmability - MAX6424UK26 uniquely balances precision, flexibility, and drive strength in a 5-pin SOT23.
Availability
MAX6424UK26 is available at Aetrix Electronics and suitable for automotive body control modules, portable medical instruments, industrial PLC I/O, smart energy meters, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges.
Supply support for MAX6424UK26 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 medical applications - emphasizing reliability, low power, and high integration.
The MAX642x series targets ultra-low-power microprocessor supervision in harsh environments, delivering accurate voltage monitoring, programmable timing, and robust glitch immunity in miniature packages.
FAQ
What is the exact reset threshold voltage of MAX6424UK26?
The MAX6424UK26 has a nominal reset threshold of 2.625V, with ±2.5% accuracy over the full operating temperature range (-40°C to +125°C), as confirmed by Maxim's datasheet Table 1 (suffix "26") and Electrical Characteristics section. This value is laser-trimmed at wafer sort and does not require external calibration.
Does MAX6424UK26 require an external pull-up resistor on the RESET pin?
No, MAX6424UK26 does not require an external pull-up resistor because it features an active-low push-pull RESET output. The device can both sink up to 3.2mA and source up to 800µA, enabling direct interface to µP reset inputs without additional components - unlike open-drain alternatives such as MAX6425UK26.
How do I calculate the reset timeout capacitor for MAX6424UK26?
Use the formula CSRT = (tRP − 275µs) / 2.73×10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 100ms timeout requires CSRT ≈ 36.5nF. Ceramic capacitors with leakage <10nA are recommended, and SRT trace layout must minimize stray capacitance per the datasheet Layout Consideration section.
Is MAX6424UK26 qualified for automotive applications?
Yes, MAX6424UK26 is rated for −40°C to +125°C operation and specified with guaranteed performance across that range, making it suitable for under-hood and body-control automotive applications. It meets AEC-Q100 stress-test requirements as part of the broader MAX642x family, though individual qualification documentation should be obtained from Analog Devices for compliance audits.
Can MAX6424UK26 operate with VCC below 1.6V?
Yes - MAX6424UK26 is fully specified down to VCC = 1.0V, with guaranteed RESET assertion validity and functional operation. Its 1.6µA typical quiescent current and ability to assert RESET down to 1V enable use in deep-brownout scenarios common in battery-depleted portable systems, as explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables.
MAX6424UK26 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- 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
MAX6424UK26 FAQ
1.How can I place an order for MAX6424UK26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6424UK26 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 MAX6424UK26 reliable?
The price and inventory of MAX6424UK26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6424UK26 is usually 5 days.
3.What payment methods are accepted for MAX6424UK26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6424UK26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6424UK26?
MAX6424UK26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6424UK26 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 MAX6424UK26?
For technical support, including MAX6424UK26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6424UK26 requirements.
6.How does Aetrix verify that MAX6424UK26 is sourced from the original manufacturer or authorized distributors?
All MAX6424UK26 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 MAX6424UK26 meets industry standards.
7.What is the process for return or replacement of MAX6424UK26?
All MAX6424UK26 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6424UK26, 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 MAX6424UK26 part is unused and in its original packaging.
Return procedure for MAX6424UK26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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