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Analog Devices Inc./Maxim Integrated MAX6425UK26+
- Part No.:
- MAX6425UK26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK26+.pdf
- Description:
- MAX6425 LOW-POWER, SOT MICROPROC
- Quantity:
- Payment:
- Shipping:
Inventory:372
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Product details
Overview
MAX6425UK26+ from Maxim Integrated is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.625V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (275µs base + 2.73s/F × CSRT), and guaranteed operation down to VCC = 1V. It monitors supply voltages from 1.6V to 5V and is used in battery-powered embedded controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6425UK26+ datasheet, MAX6425UK26+ pinout, MAX6425UK26+ application, or MAX6425UK26+ equivalent, key selection criteria include its SOT23-5 open-drain output architecture, 1.6µA typical quiescent current, -40°C to +125°C operating range, and compatibility with multi-rail logic interfacing via external pullup.
Technical Context
The MAX6425UK26+ implements a precision voltage comparator with laser-trimmed resistors to set its 2.625V reset threshold, coupled with a 240nA internal ramp current source that charges an external capacitor on the SRT pin to generate the programmable reset timeout delay. Its open-drain RESET output allows level-shifting across supply domains up to 5.5V.
It features hysteresis of 4×VTH (≈10.5mV), immunity to VCC transients ≤50µs when overdriven by 100mV below VTH, and valid reset assertion even as VCC falls to 1V - enabling robust operation during deep brownout conditions common in portable and automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% (factory-trimmed suffix "26"); ensures accurate detection of 2.6V system rail collapse |
| Quiescent Current | 1.6µA typical at +25°C; enables >10-year battery life in always-on monitoring applications |
| Reset Timeout Base | 275µs minimum (CSRT = 0); provides deterministic minimum reset hold time before timeout begins |
| VCC Operating Range | 1.0V to 5.5V; guarantees functional reset assertion down to 1V, critical for ultra-low-voltage brownout recovery |
| Output Type | Active-low open-drain; supports wired-OR reset architectures and logic-level translation up to 5.5V |
| Temperature Range | -40°C to +125°C; qualified for under-hood automotive and industrial embedded environments |
| VCC to Reset Delay | 80µs (VCC falling at 1mV/µs); fast response prevents spurious µP execution during rapid supply collapse |
Pinout & Package
MAX6425UK26+ is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (open-drain output), Pin 4 is N.C. (not internally connected), and Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset timeout capacitor input | 240nA constant-current ramp source; connects to ground via CSRT to set tRP = 2.73×10⁶×CSRT + 275µs |
| 2 - GND | Ground reference | Primary return path for internal bias and SRT current; must be low-impedance for timing accuracy |
| 3 - RESET | Open-drain active-low reset output | Drives low during reset; requires external pullup (10kΩ–100kΩ) to any logic supply (0–5.5V) |
| 4 - N.C. | No internal connection | May be tied to GND for mechanical stability; no electrical function |
| 5 - VCC | Supply and threshold monitor input | Monitors system rail; powers internal circuitry and defines reset trip point; valid down to 1V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (e.g., 100ms with 36.6nF) to match µP reset requirements without firmware changes |
| Open-drain RESET with 5.5V tolerance | Permits direct interface to 3.3V, 2.5V, or 1.8V µP reset inputs using a single pullup resistor, eliminating level translators |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during severe brownout, preventing undefined µP state in low-energy battery scenarios |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold, reducing false resets in noisy power environments |
| Laser-trimmed reset threshold accuracy | ±2.5% over -40°C to +125°C eliminates need for external calibration and supports high-reliability automotive qualification |
Applications
| Battery-Powered Embedded Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: A handheld medical sensor operates from a single Li-ion cell (2.8V–4.2V) and must guarantee clean boot after battery insertion or voltage sag. IC Role / Device Role / Timing Role: MAX6425UK26+ asserts active-low RESET until VCC rises above 2.625V and sustains it for ≥100ms (via 36.6nF SRT cap) to meet ARM Cortex-M0+ reset timing. Use Value: 1.6µA quiescent current extends shelf life; open-drain output interfaces directly to 3.0V µP reset pin without level shifter. |
Use Scenario: Under-hood ECU powered by 12V battery with wide load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 5V LDO output; triggers reset if rail drops below 2.625V during cranking, with 50µs glitch immunity preventing false trips. Use Value: -40°C to +125°C rating and 1V min VCC operation ensure reliability across full automotive temperature range. |
| Industrial Programmable Logic Controller | Medical Infusion Pump Controller |
|
Use Scenario: PLC I/O module powered from 3.3V isolated DC-DC converter subject to EMI-induced supply noise. IC Role / Device Role / Timing Role: Provides fail-safe reset independent of µP firmware; open-drain RESET wired-OR'd with watchdog signal to force hard reset on fault. Use Value: N.C. pin allows PCB routing flexibility; SOT23-5 footprint minimizes board space in dense control modules. |
Use Scenario: Safety-critical infusion pump with dual-voltage rails (3.3V logic, 5V motor driver) requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Supervises 3.3V rail; RESET pulled up to 5V enables simultaneous reset assertion across both voltage domains. Use Value: 5.5V-tolerant open-drain output eliminates need for separate reset supervisors per rail, reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN26T1G | Fixed 2.63V threshold, 200ms factory-set timeout, push-pull output | Lacks capacitor-adjustable timeout and open-drain flexibility; requires PCB redesign for wired-OR | Select when fixed timeout suffices and push-pull drive simplifies layout |
| TLV803EC26DBZR | 2.63V threshold, 140ms min timeout, open-drain, but only rated to +85°C | Not qualified for automotive or extended industrial temperature use | Choose for cost-sensitive consumer applications where -40°C to +125°C is not required |
Compared with NCP302LSN26T1G and TLV803EC26DBZR, the MAX6425UK26+ uniquely combines capacitor-programmable timeout, open-drain output, and full automotive temperature range - making it the only option supporting both flexible timing and multi-rail reset coordination in harsh environments.
Availability
MAX6425UK26+ is available at Aetrix Electronics and suitable for battery-powered computers, automotive body electronics, and medical equipment requiring stable component supply across long production lifecycles.
Supply support for MAX6425UK26+ 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.
The MAX6425UK26+ belongs to Maxim's µP supervisor family engineered for ultra-low-power, high-accuracy voltage monitoring in resource-constrained embedded systems where reset integrity directly impacts safety and reliability.
FAQ
What is the exact reset threshold voltage of MAX6425UK26+ and how is it trimmed?
The MAX6425UK26+ has a nominal reset threshold of 2.625V, with ±2.5% accuracy over -40°C to +125°C. This value is achieved via factory laser trimming of internal resistors, as confirmed by the "26" suffix in the part number and Table 1 of the datasheet. No external components affect this threshold; it is fixed and calibrated at wafer test.
How do I calculate the reset timeout capacitor value for MAX6425UK26+?
Use the formula CSRT = (tRP − 275µs) / 2.73×10⁶, where tRP is your desired timeout in seconds and CSRT is in farads. For example, a 100ms timeout requires CSRT = (0.1 − 0.000275) / 2.73×10⁶ ≈ 36.6nF. The datasheet specifies ceramic capacitors with leakage <10nA for best accuracy.
Can MAX6425UK26+ drive a 5V microcontroller reset input from a 3.3V system rail?
Yes. The MAX6425UK26+ features an open-drain RESET output rated to 5.5V. Connect a pullup resistor (e.g., 10kΩ) from RESET to the 5V supply. When asserted, RESET pulls low regardless of VCC; when deasserted, the 5V pullup sets RESET high - enabling seamless level translation without additional components.
Does MAX6425UK26+ remain functional when VCC drops below 1.6V?
Yes. The MAX6425UK26+ guarantees valid reset assertion down to VCC = 1.0V, as stated in the Electrical Characteristics table. Below 1.0V, internal circuitry ceases operation, but the open-drain output remains low (due to lack of pullup current), preserving reset state until power is fully removed.
Is the N.C. pin on MAX6425UK26+ required to be grounded?
No. Pin 4 of MAX6425UK26+ is Not Connected internally and may be left floating, tied to GND, or routed as a spare. Grounding it improves mechanical stability on the PCB but has no electrical effect on timing, reset behavior, or accuracy - per the Pin Description table in the datasheet.
MAX6425UK26+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 3ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6425UK26+ FAQ
1.How can I place an order for MAX6425UK26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK26+ 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 MAX6425UK26+ reliable?
The price and inventory of MAX6425UK26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK26+ is usually 5 days.
3.What payment methods are accepted for MAX6425UK26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK26+?
MAX6425UK26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK26+ 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 MAX6425UK26+?
For technical support, including MAX6425UK26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK26+ requirements.
6.How does Aetrix verify that MAX6425UK26+ is sourced from the original manufacturer or authorized distributors?
All MAX6425UK26+ 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 MAX6425UK26+ meets industry standards.
7.What is the process for return or replacement of MAX6425UK26+?
All MAX6425UK26+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK26+, 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 MAX6425UK26+ part is unused and in its original packaging.
Return procedure for MAX6425UK26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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