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Analog Devices Inc./Maxim Integrated MAX6425UK26-T
- Part No.:
- MAX6425UK26-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK26-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:14,676
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Product details
Overview
MAX6425UK26-T from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain active-low RESET output, 2.625V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (275µs to >100ms), and guaranteed operation down to VCC = 1V. It monitors system supply voltage in portable, automotive, and medical equipment where precise brownout detection and flexible reset timing are required.
For engineers reviewing the MAX6425UK26-T datasheet, MAX6425UK26-T pinout, MAX6425UK26-T application, or MAX6425UK26-T equivalent, key selection criteria include its SOT23-5 open-drain output architecture, 1.6µA typical quiescent current, 240nA SRT ramp current, -40°C to +125°C operating range, and compatibility with multi-rail logic interfaces via external pullup.
Technical Context
This device implements a precision voltage detector with hysteresis (4×VTH) and a capacitor-controlled reset timeout timer using an internal 240nA current source charging the SRT pin to a 0.65V reference. Reset assertion occurs when VCC falls below 2.625V, and deassertion is delayed until the SRT capacitor ramps to 0.65V after VCC recovers.
The open-drain RESET output supports wired-OR configuration and logic-level translation across supplies from 0V to 5.5V via external pullup (10kΩ–100kΩ). Immunity to short VCC transients (<50µs for 100mV overdrive) is achieved through internal filtering and threshold hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% at -40°C to +125°C - ensures reliable brownout detection across full industrial temperature range |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in always-on portable systems |
| Reset Timeout Range | 275µs minimum (CSRT = 0) to >100ms (CSRT = 100nF) - configurable via external capacitor for µP startup timing compliance |
| SRT Ramp Current | 240nA ±20% - defines linear charging rate of external capacitor for accurate timeout calibration |
| VCC Operating Range | 1.0V to 5.5V - guarantees valid RESET output even during deep undervoltage conditions before system shutdown |
| RESET Output Type | Open-drain, active-low - allows level-shifting, wired-OR reset combining, and interface to mixed-voltage µP reset inputs |
| VCC to Reset Delay | 80µs maximum at 1mV/µs VCC fall rate - ensures fast response to supply collapse without false triggering |
Pinout & Package
MAX6425UK26-T is housed in a 5-pin SOT23-5 package with exposed pad (not electrically connected), footprint compatible with JEDEC MO-178AA. Pin 1 is marked by a dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and SRT capacitor return path |
| 2 | RESET | Open-drain active-low reset output - requires external pullup resistor to define logic-high voltage |
| 3 | N.C. | No internal connection - may be left floating or tied to GND per layout best practice |
| 4 | VCC | Supply input and monitored voltage rail - powers device and sets reset threshold reference |
| 5 | SRT | Set-reset-time input - connects to external capacitor to program timeout period via 240nA current source |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise µP reset hold time tuning (275µs–100ms+) without firmware or external logic |
| Open-drain RESET with 0.3V VOL @ 500µA | Ensures clean logic-low assertion across diverse µP reset input thresholds and supply voltages |
| Guaranteed operation to VCC = 1V | Prevents premature reset release during deep brownout recovery, improving system robustness |
| Immunity to short VCC transients | Rejects <50µs glitches at 100mV below threshold - eliminates spurious resets in noisy power environments |
| Factory-trimmed 2.625V threshold (±2.5%) | Eliminates external resistor networks and calibration overhead for fixed-threshold applications |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor with coin-cell battery and ultra-low-power MCU requiring deterministic reset behavior during battery voltage sag. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until VCC stabilizes above 2.625V and holds it for ≥10ms via 33nF SRT capacitor. Use Value: Prevents MCU code execution errors during battery replacement or cold-start, extending field reliability beyond 5 years. |
Use Scenario: Door module ECU powered from vehicle battery subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: Brownout detector holding microcontroller in reset during 12V rail collapse below 2.625V, with 50µs transient immunity preventing false triggers. Use Value: Eliminates unintended door lock/unlock events caused by supply noise, meeting ISO 16750-2 pulse test requirements. |
| Industrial Handheld Terminals | Smart Energy Meters |
|
Use Scenario: Ruggedized barcode scanner with Li-ion battery and ARM Cortex-M3 MCU needing glitch-free power-up sequencing. IC Role / Device Role / Timing Role: Open-drain RESET pulled up to 3.3V MCU rail while interfacing with 5V display controller - enabling single reset signal for dual-voltage subsystems. Use Value: Reduces BOM count by replacing two discrete supervisors; simplifies PCB routing with shared reset net. |
Use Scenario: Electricity meter with metrology SoC and secure bootloader requiring tamper-resistant power monitoring. IC Role / Device Role / Timing Role: Supervisory watchdog asserting RESET if VCC drops below 2.625V during power theft attempts or grid instability. Use Value: Ensures cryptographic keys remain locked and firmware integrity verified before boot - satisfying IEC 62056-62 security mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN26T1G | Fixed 2.63V threshold, 1.8µA ICC, push-pull RESET, no capacitor-adjustable timeout | Lacks timeout configurability; requires external RC network for delay extension | Choose when board space is constrained and fixed 200ms reset hold suffices |
| TPS3808G125DBVR | 2.63V threshold, 1.1µA ICC, adjustable timeout via resistor (not capacitor), push-pull RESET | Timeout set by resistor value (1–10s range); less precise than capacitor method at sub-10ms | Prefer when high-temperature stability (>125°C) and lower ICC are critical, accepting resistor-based tuning |
Compared with MAX6425UK26-T, NCP302LSN26T1G offers lower cost but sacrifices timeout flexibility and open-drain interoperability, while TPS3808G125DBVR delivers superior quiescent current and extended timeout range but requires different layout for resistor-based timing and lacks multi-supply reset translation capability.
Availability
MAX6425UK26-T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, industrial handheld terminals, smart energy meters, and critical µP monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6425UK26-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 industrial, automotive, communications, and computing markets, with emphasis on power efficiency and reliability.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for space-constrained, battery-sensitive applications where deterministic brownout response and multi-rail logic compatibility are essential.
FAQ
What is the exact reset threshold voltage of MAX6425UK26-T and how tightly is it specified?
The MAX6425UK26-T features a factory-trimmed reset threshold of 2.625V, with guaranteed accuracy of ±2.5% over the full -40°C to +125°C operating temperature range. This specification is confirmed in the Electrical Characteristics table of the official datasheet (Rev 5, Dec 2013), where VTH min/max values are listed as 2.559V and 2.691V respectively at TA = -40°C to +125°C.
Can MAX6425UK26-T drive a reset input that operates at 1.8V logic level while powered from a 3.3V VCC rail?
Yes, MAX6425UK26-T can interface to a 1.8V µP reset input because its open-drain RESET output supports logic-level translation: connect the external pullup resistor to the 1.8V rail instead of VCC. The device's RESET pin tolerates voltages up to 6.0V, and leakage current remains below 1.0µA when not asserted, ensuring clean high/low states regardless of pullup voltage.
What capacitor value is required to achieve a 50ms reset timeout with MAX6425UK26-T?
To achieve a 50ms reset timeout, use CSRT = (tRP – 275µs) / 2.73×10⁶ = (0.050 – 0.000275) / 2.73×10⁶ ≈ 18.2nF. A standard 18nF ceramic capacitor (X7R, low-leakage) meets this requirement. The datasheet confirms this calculation in the "Selecting a Reset Capacitor" section and shows 1500pF yields ~4.375ms in Figure toc02.
Does MAX6425UK26-T remain functional when VCC drops below 1.6V?
Yes, MAX6425UK26-T is fully specified to operate down to VCC = 1.0V, with guaranteed RESET validity and 240nA SRT ramp current functionality. The Electrical Characteristics table explicitly lists VCC range as 1.0V to 5.5V, and the Detailed Description states "All device outputs are guaranteed valid for VCC > 1V." Below 1.0V, operation is not characterized.
Is MAX6425UK26-T pin-compatible with any industry-standard alternatives?
MAX6425UK26-T is documented as pin-compatible with NCP300–NCP303, MC33464/MC33465, S807/S808/S809, and RN5VD series devices in the Ordering Information section of the datasheet. This compatibility applies specifically to the 5-pin SOT23-5 package and open-drain output configuration, enabling drop-in replacement in existing layouts designed for those parts.
MAX6425UK26-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:
- 2.625V
- 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
MAX6425UK26-T FAQ
1.How can I place an order for MAX6425UK26-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK26-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 MAX6425UK26-T reliable?
The price and inventory of MAX6425UK26-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK26-T is usually 5 days.
3.What payment methods are accepted for MAX6425UK26-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK26-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK26-T?
MAX6425UK26-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK26-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 MAX6425UK26-T?
For technical support, including MAX6425UK26-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK26-T requirements.
6.How does Aetrix verify that MAX6425UK26-T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK26-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 MAX6425UK26-T meets industry standards.
7.What is the process for return or replacement of MAX6425UK26-T?
All MAX6425UK26-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK26-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 MAX6425UK26-T part is unused and in its original packaging.
Return procedure for MAX6425UK26-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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