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Analog Devices Inc./Maxim Integrated MAX6425UK17
- Part No.:
- MAX6425UK17
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK17.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:235
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Product details
Overview
MAX6425UK17 from Maxim Integrated is a low-power microprocessor supervisor IC in 5-pin SOT23-5 package, featuring an active-low open-drain RESET output, factory-trimmed 1.665V reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs base + 2.73s/F × CSRT), and guaranteed operation down to VCC = 1V. It monitors supply voltage for brownout detection in battery-powered embedded controllers.
For engineers reviewing the MAX6425UK17 datasheet, MAX6425UK17 pinout, MAX6425UK17 application, or MAX6425UK17 equivalent, this device is selected for ultra-low-quiescent-current (1.6µA typ) reset supervision where flexible timeout tuning, open-drain logic compatibility with multiple supply rails, and automotive-grade temperature range (-40°C to +125°C) are required.
Technical Context
The MAX6425UK17 uses a precision 240nA internal current source to charge an external capacitor on the SRT pin; reset deassertion occurs when the ramp voltage reaches 0.65V. Its reset threshold is laser-trimmed and exhibits ±2.5% accuracy across -40°C to +125°C.
As an open-drain supervisor, it requires an external pullup resistor (10kΩ–100kΩ) to any rail up to 5.5V, enabling wired-OR reset architectures and level-shifting. It remains functional down to VCC = 1V, with RESET leakage <1.0µA when not asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.665V nominal (suffix '17'), ±2.5% over -40°C to +125°C - ensures reliable brownout detection at 1.6V systems |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in portable medical or sensor nodes |
| Reset Timeout Base | 275µs minimum (CSRT = 0) - provides guaranteed minimum assertion time for slow-start µPs |
| SRT Ramp Current | 240nA ±15% - sets linear charging rate for precise timeout scaling with external capacitor |
| VCC Operating Range | 1.0V to 5.5V - supports supervision of 1.2V, 1.8V, 2.5V, 3.3V, and 5V rails without external biasing |
| RESET Output Type | Active-low open-drain - allows connection to mixed-voltage logic and wired-OR reset bus sharing |
| VCC to RESET Delay | 80µs max (VCC falling at 1mV/µs) - ensures fast response to supply collapse before µP corruption |
Pinout & Package
MAX6425UK17 is housed in a 5-pin SOT23-5 package (outline 21-0057), with exposed pad option not specified. Pin 3 is internally unconnected (N.C.) and may be tied to GND per layout best practice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input - connects to external timing capacitor; 240nA current source charges CSRT to 0.65V for timeout control |
| 2 | GND | Ground reference - return path for internal circuitry and SRT capacitor discharge |
| 3 | N.C. | Not internally connected - no electrical function; recommended to tie to GND for mechanical stability and noise immunity |
| 4 | VCC | Supply voltage and reset threshold monitor input - powers device and defines monitored rail; valid from 1.0V to 5.5V |
| 5 | RESET | Active-low open-drain reset output - sinks current when asserted; requires external pullup for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | tRP = 2.73 × 10⁶ × CSRT + 275µs - enables precise, application-specific reset hold times from ~300µs to seconds using standard ceramic capacitors |
| Open-drain RESET with 5.5V tolerance | RESET pin withstands up to 6.0V - permits direct interface to 3.3V, 5V, or mixed-voltage µP reset inputs without level shifters |
| Guaranteed reset validity to VCC = 1V | RESET remains functional and monotonic down to 1.0V supply - prevents spurious release during deep brownout recovery |
| Immunity to short VCC transients | No reset issued for ≤50µs glitches 100mV below VTH - eliminates false resets from switching noise or ESD-induced dips |
| Low-leakage SRT pin design | Stray capacitance <1pF and leakage <10nA required - mandates short, guarded trace routing to maintain timeout accuracy |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by coin cell, requiring reliable power-on reset and brownout protection during RF transmission bursts. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until VCC stabilizes above 1.665V and holds for ≥10ms (CSRT = 3.3nF). Use Value: 1.6µA quiescent current extends battery life beyond 3 years; open-drain output interfaces directly to 3.3V µP reset pin while tolerating 5V CAN transceiver supply noise. |
Use Scenario: Door module MCU subjected to load-dump transients and cold-crank voltage sag below 6V. IC Role / Device Role / Timing Role: Monitors 5V regulated rail; asserts open-drain RESET during sags below 1.665V and holds for 100ms (CSRT = 33nF) to ensure full MCU reboot. Use Value: -40°C to +125°C rating meets AEC-Q100 ambient requirements; immunity to ≤50µs transients prevents false resets during alternator switching noise. |
| Industrial IoT Edge Node | Portable Test Equipment |
|
Use Scenario: LoRaWAN node with dual-supply architecture (3.3V MCU, 5V sensor interface) requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Single MAX6425UK17 supervises 3.3V rail and drives shared wired-OR reset bus pulling down both MCU and sensor ASIC reset pins. Use Value: Open-drain output enables safe reset bus sharing without contention; 1.665V threshold ensures early detection of Li-ion battery discharge below 3.0V. |
Use Scenario: Handheld multimeter with auto-ranging ADC and EEPROM logging, needing deterministic reset after battery insertion or low-battery cutoff. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output; timeout set to 250ms (CSRT = 82nF) to cover slow analog front-end stabilization. Use Value: Guaranteed RESET validity to VCC = 1V prevents erratic behavior during battery swap; SC70/SOT23 footprint minimizes PCB area in compact enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN16T1G | Fixed 1.6V reset threshold; no capacitor-adjustable timeout (40ms typ); SOT23-5; 0.9µA IQ | Lacks timeout flexibility; suitable only where fixed delay suffices | Select when minimal BOM count and lowest possible IQ outweigh need for tunable reset hold time |
| TLV803EB29DBZR | Fixed 2.93V threshold; push-pull active-low RESET; SOT23-3; 0.5µA IQ; no SRT pin | Higher threshold incompatible with 1.8V systems; no open-drain or timeout adjustment | Choose only for 3.3V+ systems requiring smallest footprint and absolute lowest IQ, accepting fixed functionality |
Compared with MAX6425UK17, NCP302LSN16T1G offers lower quiescent current but forfeits timeout adjustability, while TLV803EB29DBZR reduces pin count and IQ yet locks threshold and output type-making MAX6425UK17 uniquely balanced for designs needing precision 1.665V detection, open-drain flexibility, and field-tunable reset duration.
Availability
MAX6425UK17 is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and industrial IoT edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6425UK17 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 computing applications.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for space-constrained, battery-sensitive systems where accurate voltage monitoring and flexible timeout control are critical.
FAQ
What is the exact reset threshold voltage of MAX6425UK17 and how tightly is it specified?
The MAX6425UK17 has a nominal reset threshold of 1.665V, with factory laser trimming ensuring ±1.5% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This specification is guaranteed in the Electrical Characteristics table and applies directly to the '17' suffix variant, making it suitable for 1.6V–1.8V system rails where tight brownout margins are essential.
Can MAX6425UK17 drive a 5V microcontroller reset input while powered from a 3.3V supply?
Yes. The MAX6425UK17 features an open-drain RESET output rated to 6.0V, allowing its drain to be pulled up to 5V via an external resistor while VCC is at 3.3V. This enables direct interfacing with 5V-tolerant µP reset inputs without level-shifting circuitry, preserving signal integrity and board space.
How do I calculate the external capacitor value needed for a 200ms reset timeout with MAX6425UK17?
Use the formula CSRT = (tRP − 275µs) / 2.73×10⁶, where tRP is in seconds. For 200ms: CSRT = (0.2 − 0.000275) / 2,730,000 ≈ 73.1nF. A standard 75nF X7R ceramic capacitor meets this requirement and maintains low leakage (<10nA), ensuring timeout accuracy across temperature.
Is MAX6425UK17 qualified for automotive applications?
The MAX6425UK17 itself is not automotive-qualified; however, the MAX6425UK17/V+T variant (with '/V' suffix) is AEC-Q100 Grade 2 qualified (-40°C to +105°C ambient) and offered in lead-free packaging. Standard MAX6425UK17 operates from -40°C to +125°C junction temperature but lacks automotive qualification documentation and screening.
What is the purpose of the N.C. pin (Pin 3) on MAX6425UK17, and how should it be handled on the PCB?
Pin 3 of MAX6425UK17 is Not Connected internally. Maxim recommends tying it to GND on the PCB to improve mechanical stability, reduce parasitic antenna effects, and minimize noise coupling into the sensitive SRT pin located adjacent at Pin 1. Leaving it floating risks EMI susceptibility and potential timeout inaccuracy.
MAX6425UK17 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
MAX6425UK17 FAQ
1.How can I place an order for MAX6425UK17 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK17 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 MAX6425UK17 reliable?
The price and inventory of MAX6425UK17 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK17 is usually 5 days.
3.What payment methods are accepted for MAX6425UK17?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK17 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK17?
MAX6425UK17 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK17 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 MAX6425UK17?
For technical support, including MAX6425UK17 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK17 requirements.
6.How does Aetrix verify that MAX6425UK17 is sourced from the original manufacturer or authorized distributors?
All MAX6425UK17 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 MAX6425UK17 meets industry standards.
7.What is the process for return or replacement of MAX6425UK17?
All MAX6425UK17 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK17, 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 MAX6425UK17 part is unused and in its original packaging.
Return procedure for MAX6425UK17:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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