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Analog Devices Inc./Maxim Integrated MAX6426UK17-T
- Part No.:
- MAX6426UK17-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6426UK17-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6426UK17-T from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain active-low RESET output, 5-pin SOT23-5 package, factory-trimmed reset threshold of 1.665V (±2.5%), capacitor-adjustable reset timeout, and guaranteed operation down to VCC = 1V. It monitors supply voltage in battery-powered embedded controllers and portable medical instruments.
For engineers reviewing the MAX6426UK17-T datasheet, MAX6426UK17-T pinout, MAX6426UK17-T application, or MAX6426UK17-T equivalent, key selection criteria include reset threshold accuracy, SRT capacitor-based timeout tuning, open-drain logic compatibility with multiple supply rails, and quiescent current under 2.5µA at 25°C.
Technical Context
The MAX6426UK17-T implements a precision voltage monitor with laser-trimmed internal reference and hysteresis of 4×VTH (≈6.66mV). Its reset assertion is triggered when VCC falls below 1.665V, and deassertion occurs after a user-defined timeout set by an external capacitor on the SRT pin.
A 240nA internal ramp current charges the SRT capacitor to a 0.65V threshold; timeout tRP = 2.73×10⁶ × CSRT + 275µs. The open-drain RESET output supports wired-OR configuration and logic-level translation across 0–5.5V supplies via external pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.665V ±2.5% - ensures reliable brownout detection for 1.8V systems with margin |
| Quiescent Current | 1.6µA typ - enables multi-year battery life in always-on portable devices |
| Reset Timeout Range | 275µs to >10ms - adjustable via 0–1500pF SRT capacitor for µP startup timing compliance |
| VCC Operating Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout |
| Output Type | Active-low open-drain - allows level-shifting, wired-OR reset, and interface with 3.3V/5V µP inputs |
| Reset Delay (VCC fall) | 80µs - fast response to supply glitches without false triggering |
| Hysteresis | 4×VTH ≈ 6.66mV - prevents chatter near threshold during slow VCC recovery |
Pinout & Package
MAX6426UK17-T is housed in a 5-pin SOT23-5 package with exposed pad (not electrically connected), footprint compatible with JEDEC MO-178AB. Pin 1 is marked with a dot; pin order is VCC, GND, SRT, RESET, N.C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Supply input & reset threshold monitor | Primary power rail connection; internal comparator references this node |
| 2 (GND) | Analog and digital ground reference | Low-impedance return path for internal bias and SRT capacitor discharge |
| 3 (SRT) | Reset timeout capacitor interface | 240nA precision current source charges external CSRT to set tRP |
| 4 (RESET) | Active-low open-drain output | Drives low during reset; requires external pullup for logic-high state |
| 5 (N.C.) | No internal connection | May be tied to GND for mechanical stability; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise matching to µP reset timing requirements without firmware changes |
| Open-drain RESET output | Supports multi-rail systems and wired-OR reset arbitration with auxiliary circuitry |
| Guaranteed operation to VCC = 1V | Maintains valid reset signaling through deep brownout, preventing undefined µP states |
| Immunity to short VCC transients | Rejects ≤50µs glitches 100mV below threshold - eliminates false resets in noisy environments |
| Low leakage SRT interface | Minimizes timeout drift from PCB contamination or humidity; ceramic capacitor recommended |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor operating from coin-cell battery with intermittent RF transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during battery sag below 1.665V, holding µP in reset until stable power returns and timeout expires. Use Value: Prevents corrupted sensor readings and flash writes during undervoltage, extending usable battery life by avoiding premature shutdown. | Use Scenario: Door module with LIN transceiver and EEPROM, powered from vehicle battery subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: Brownout detector generating clean, glitch-immune reset pulse aligned to µP power-up sequence. Use Value: Ensures deterministic boot after ignition cycles, eliminating watchdog timeouts caused by transient-induced µP lockup. |
| Portable Industrial Data Loggers | Smart Energy Meters |
Use Scenario: Handheld meter reading device with real-time clock, flash memory, and Bluetooth LE, powered by rechargeable Li-ion. IC Role / Device Role / Timing Role: Supervisor monitoring main 3.3V rail and enabling controlled shutdown before VCC drops below 1.8V logic threshold. Use Value: Guarantees safe EEPROM write completion and RTC register preservation during power loss. | Use Scenario: DIN-rail mounted electricity meter with isolated power supplies and tamper-detection circuitry. IC Role / Device Role / Timing Role: Primary reset generator coordinating startup of metrology ASIC, communication processor, and secure element. Use Value: Enforces strict power-on reset sequencing required for cryptographic key loading and calibration data validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PST9222XK17TR | Same 1.665V threshold, 5-pin SOT23, open-drain output, but higher ICC (3.5µA typ) and fixed 200ms timeout | Lacks capacitor-adjustable timeout; unsuitable where µP-specific reset duration is required | Select MAX6426UK17-T when precise timeout tuning or ultra-low ICC (<2µA) is critical |
| NCP302LS17T1G | 1.65V threshold, SOT23-5, open-drain, but no SRT adjustment - fixed 140ms timeout and higher hysteresis (1.5% of VTH) | Not suitable for applications requiring sub-millisecond timeout or tight hysteresis control | Choose MAX6426UK17-T for designs needing <300µs minimum timeout or <7mV hysteresis |
Compared with PST9222XK17TR and NCP302LS17T1G, the MAX6426UK17-T provides uniquely adjustable reset timing via external capacitor, lower quiescent current, tighter threshold tolerance, and smaller hysteresis - making it optimal for energy-constrained, timing-critical embedded systems.
Availability
MAX6426UK17-T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and portable industrial data loggers requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6426UK17-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
Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervisors optimized for portable, battery-operated, and automotive-grade embedded systems requiring high accuracy and glitch immunity.
FAQ
What is the exact reset threshold voltage of the MAX6426UK17-T?
The MAX6426UK17-T has a factory-trimmed nominal reset threshold of 1.665V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 1 of the datasheet, where suffix "17" corresponds to 1.623V (min), 1.665V (typ), and 1.707V (max).
How do I calculate the reset timeout period for the MAX6426UK17-T?
The reset timeout period tRP for the MAX6426UK17-T is calculated using tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the capacitor value in farads connected between the SRT pin and ground. For example, a 1000pF capacitor yields tRP ≈ 2.73ms + 0.275ms = 3.005ms.
Can the MAX6426UK17-T drive a 5V microcontroller reset input from a 3.3V supply?
Yes - the MAX6426UK17-T features an open-drain RESET output that supports logic-level translation. Connect a pullup resistor from the RESET pin to the 5V µP supply rail; the device will assert a solid low (≤0.4V at 3.2mA sink) and release to high-impedance, allowing the 5V rail to define the high state.
Is the NC pin on the MAX6426UK17-T required to be grounded?
No - Pin 5 (N.C.) of the MAX6426UK17-T is not internally connected and has no electrical function. It may be left floating or tied to ground for mechanical stability or solder joint reinforcement, but grounding is not required for electrical performance.
What is the maximum allowable leakage current for the SRT capacitor in the MAX6426UK17-T?
The SRT capacitor for the MAX6426UK17-T must exhibit leakage current less than 10nA to prevent timeout drift. Ceramic capacitors are explicitly recommended in the datasheet due to their low leakage and stability; avoid electrolytic or high-leakage film types.
MAX6426UK17-T 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:
- 1.665V
- Output:
- Open Drain or Open Collector
- 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
MAX6426UK17-T FAQ
1.How can I place an order for MAX6426UK17-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6426UK17-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 MAX6426UK17-T reliable?
The price and inventory of MAX6426UK17-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6426UK17-T is usually 5 days.
3.What payment methods are accepted for MAX6426UK17-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6426UK17-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6426UK17-T?
MAX6426UK17-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6426UK17-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 MAX6426UK17-T?
For technical support, including MAX6426UK17-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6426UK17-T requirements.
6.How does Aetrix verify that MAX6426UK17-T is sourced from the original manufacturer or authorized distributors?
All MAX6426UK17-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 MAX6426UK17-T meets industry standards.
7.What is the process for return or replacement of MAX6426UK17-T?
All MAX6426UK17-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6426UK17-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 MAX6426UK17-T part is unused and in its original packaging.
Return procedure for MAX6426UK17-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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