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Analog Devices Inc./Maxim Integrated MAX6425UK31-T
- Part No.:
- MAX6425UK31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:14,950
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Product details
Overview
MAX6425UK31-T from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain active-low RESET output, 3.075V nominal reset threshold (suffix "31"), capacitor-adjustable reset timeout, and guaranteed operation down to VCC = 1V. It monitors supply voltage in portable and battery-powered systems, asserts reset during brownout, and holds reset for a user-defined delay after VCC recovers - used in medical instruments and embedded controllers requiring reliable power-on initialization.
For engineers reviewing the MAX6425UK31-T datasheet, MAX6425UK31-T pinout, MAX6425UK31-T application, or MAX6425UK31-T equivalent, key selection criteria include its SOT23-5 open-drain output architecture, ±2.5% reset threshold accuracy over –40°C to +125°C, 1.6µA typical quiescent current, and compatibility with external pullup voltages up to 5.5V.
Technical Context
The MAX6425UK31-T implements a precision voltage detector with laser-trimmed internal reference and hysteresis of 4×VTH (≈12.3mV at 3.075V). Its reset timeout is generated by a 240nA constant-current source charging an external capacitor (CSRT) to a 0.65V ramp threshold, enabling adjustable delays from 275µs (CSRT = 0) to >10ms (e.g., 1500pF → ~4.375ms).
It features immunity to short VCC transients: a 100mV overdrive below VTH tolerates ≤50µs glitches without false reset assertion. The open-drain RESET output supports wired-OR configuration and logic-level translation across supplies from 0V to 5.5V via external pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V nominal (suffix "31"), ±2.5% over –40°C to +125°C - ensures deterministic reset activation across automotive/industrial temperature range |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 275µs minimum (CSRT = 0), scalable to >10ms with external capacitor - supports µP boot timing requirements from fast microcontrollers to complex SoCs |
| Supply Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout down to 1V VCC |
| Output Type | Active-low open-drain - allows level-shifting, wired-OR reset combining, and interface to µP reset inputs with differing logic thresholds |
| VCC to Reset Delay | 80µs maximum (VCC falling at 1mV/µs) - provides fast response to supply collapse before system instability occurs |
| RESET Leakage | 1.0µA max (open-drain, VCC > VTH) - minimizes pullup resistor power loss and avoids unintended logic high due to leakage |
Pinout & Package
MAX6425UK31-T is housed in a 5-pin SOT23-5 package (outline 21-0057), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with standard SOT23 pick-and-place equipment and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset timeout current source; must be low-impedance connection to minimize noise coupling into SRT |
| 2 | VCC | Supply voltage input and monitored rail; powers device and sets reset threshold - valid operation guaranteed from 1.0V to 5.5V |
| 3 | N.C. | No internal connection; may be tied to GND for mechanical stability but electrically inert |
| 4 | SRT | Set Reset Timeout input; connects to external capacitor (CSRT) to ground - 240nA ramp current charges CSRT to 0.65V to define timeout period |
| 5 | RESET | Active-low open-drain output; sinks current when asserted (low), floats when deasserted (requires external pullup to define logic-high voltage) |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific delay tuning (275µs to >10ms) without firmware or external logic - eliminates fixed-timer BOM cost and layout overhead |
| Open-drain RESET output | Supports multi-voltage system interfacing (0–5.5V pullup) and wired-OR reset arbitration with auxiliary circuits - critical for fault-tolerant embedded designs |
| Guaranteed operation to VCC = 1V | Ensures clean reset assertion during deep brownout, preventing partial execution or latch-up in µPs that retain state below 1.8V |
| Immunity to short VCC transients | Rejects ≤50µs glitches at 100mV below VTH - avoids spurious resets from switching noise or ESD-induced supply dips |
| Laser-trimmed reset threshold | ±2.5% accuracy over full temperature range eliminates need for external calibration or margining - reduces design validation effort |
Applications
| Portable Medical Monitors | Battery-Powered Industrial Sensors |
|---|---|
|
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 3.075V, holding µP in reset until stable supply returns and timeout expires. Use Value: Prevents corrupted sensor readings or failed BLE handshakes caused by marginal VCC - extends usable battery life by avoiding premature shutdown. |
Use Scenario: Wireless vibration sensor node deployed in remote machinery with 10-year battery target. IC Role / Device Role / Timing Role: Low-quiescent-current (1.6µA) reset supervisor ensuring µP only boots when supply exceeds 3.075V and remains stable for ≥5ms. Use Value: Eliminates false wakeups from transient load spikes, reducing unnecessary radio transmissions and extending field service interval. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: LIN bus node powering from vehicle battery subject to cranking dips and load dump. IC Role / Device Role / Timing Role: Open-drain RESET tied to 5V MCU reset pin via 10kΩ pullup; asserts during cranking (VCC < 3.075V) and holds for 10ms after recovery. Use Value: Prevents MCU lockup during engine start while allowing immediate resumption of LIN communication post-cranking - meets ISO 16750-2 pulse 4 immunity. |
Use Scenario: Revenue-grade meter with metrology ASIC requiring clean power-on sequence after AC mains interruption. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output; triggers reset on brownout and enforces 100ms timeout to ensure ADC reference stabilization before firmware initialization. Use Value: Guarantees metrology accuracy by preventing register corruption or incomplete calibration sequences during grid instability events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN30T1G | Fixed 3.0V reset threshold, no capacitor-adjustable timeout (fixed 200ms); SOT23-5, open-drain | Lacks timeout flexibility - unsuitable where µP boot time varies or requires optimization | Select when board space is constrained and fixed 200ms delay suffices; verify 3.0V vs. 3.075V threshold margin in design |
| TLV809EC26DBZR | Fixed 2.63V threshold, push-pull active-low RESET, 350ms fixed timeout; SOT23-3 | Different output stage (push-pull) and lower threshold - incompatible with wired-OR or multi-supply reset schemes | Choose only if 2.63V trip point aligns with system VDD tolerance and no external pullup is needed |
Compared with NCP302LSN30T1G and TLV809EC26DBZR, MAX6425UK31-T offers tunable reset timing, tighter threshold accuracy (±2.5% vs. ±3%), and open-drain flexibility - making it superior for designs requiring precise boot sequencing, multi-rail compatibility, or long-term battery optimization.
Availability
MAX6425UK31-T is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered industrial sensors, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6425UK31-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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervisors targeting battery-critical and thermally harsh environments - emphasizing accuracy, glitch immunity, and flexible output configurations.
FAQ
What is the exact reset threshold voltage of MAX6425UK31-T?
The MAX6425UK31-T has a nominal reset threshold of 3.075V, with ±2.5% tolerance over the full –40°C to +125°C operating temperature range. This value is factory-laser-trimmed and confirmed in Table 1 of the datasheet under suffix "31". The actual threshold at +25°C typically falls within 2.998V to 3.152V.
How do I calculate the reset timeout capacitor for MAX6425UK31-T?
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 5ms timeout requires CSRT ≈ (0.005 − 0.000275) / 2.73×10⁶ = 1730pF. Ceramic capacitors with leakage <10nA are recommended per the MAX6425UK31-T datasheet.
Can MAX6425UK31-T drive a 5V microcontroller reset pin?
Yes - the MAX6425UK31-T's open-drain RESET output supports pullup to any voltage from 0V to 5.5V. Connect a 10kΩ–100kΩ resistor between RESET and the 5V supply. When asserted, RESET pulls low (≤0.3V at 500µA sink); when deasserted, the pullup defines the logic-high level, ensuring compatibility with 5V-tolerant µP reset inputs.
Does MAX6425UK31-T require a bypass capacitor on VCC?
Yes - a 0.1µF ceramic capacitor placed as close as possible to the VCC and GND pins is required per the MAX6425UK31-T layout guidelines. This stabilizes the internal reference and prevents false resets caused by supply noise or transient coupling, especially critical given the device's sensitivity to VCC edge rates.
Is MAX6425UK31-T qualified for automotive applications?
No - MAX6425UK31-T is specified for –40°C to +125°C operation but is not AEC-Q200 qualified. For automotive use, select the /V automotive-grade variants (e.g., MAX6425UK31/V+T), which undergo additional stress testing and lot traceability per automotive standards. The standard MAX6425UK31-T is intended for industrial and medical applications.
MAX6425UK31-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:
- 3.075V
- 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
MAX6425UK31-T FAQ
1.How can I place an order for MAX6425UK31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK31-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 MAX6425UK31-T reliable?
The price and inventory of MAX6425UK31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK31-T is usually 5 days.
3.What payment methods are accepted for MAX6425UK31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK31-T?
MAX6425UK31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK31-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 MAX6425UK31-T?
For technical support, including MAX6425UK31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK31-T requirements.
6.How does Aetrix verify that MAX6425UK31-T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK31-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 MAX6425UK31-T meets industry standards.
7.What is the process for return or replacement of MAX6425UK31-T?
All MAX6425UK31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK31-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 MAX6425UK31-T part is unused and in its original packaging.
Return procedure for MAX6425UK31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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