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Analog Devices Inc./Maxim Integrated MAX6425UK25-T
- Part No.:
- MAX6425UK25-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK25-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,251
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Product details
Overview
MAX6425UK25-T from Maxim Integrated is a low-power, open-drain microprocessor reset supervisor IC designed for precise VCC monitoring and capacitor-adjustable reset timeout in space-constrained systems. It features a factory-trimmed 2.5V reset threshold (±2.5% over -40°C to +125°C), 1.6µA typical quiescent current, guaranteed reset validity down to VCC = 1V, and a 5-pin SOT23-5 package. It is used in battery-powered controllers to prevent code-execution errors during brownout conditions.
For engineers reviewing the MAX6425UK25-T datasheet, MAX6425UK25-T pinout, MAX6425UK25-T application, or MAX6425UK25-T equivalent, key selection criteria include its open-drain RESET output compatibility with mixed-voltage µP interfaces, capacitor-programmable timeout (275µs base + 2.73×10⁶ × CSRT), ±2.5% threshold accuracy across temperature, and operation down to 1.0V supply.
Technical Context
The MAX6425UK25-T implements a precision voltage comparator with laser-trimmed internal resistors to set its 2.5V reset threshold, coupled with a 240nA constant-current ramp source charging an external capacitor on the SRT pin. Reset deassertion occurs when the SRT voltage reaches 0.65V, yielding a timeout period defined by tRP = 2.73×10⁶ × CSRT + 275µs.
Its open-drain RESET output requires an external pullup resistor (10kΩ–100kΩ) and supports logic-level interfacing up to 5.5V, enabling wired-OR reset configurations and compatibility with diverse µP I/O voltages. Immunity to short VCC transients (<50µs for 100mV overdrive) is achieved via internal filtering of the threshold detection path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.500V ±2.5% (factory-laser-trimmed; valid over -40°C to +125°C) |
| Quiescent Current | 1.6µA typical at +25°C; enables >10-year battery life in always-on monitoring |
| Reset Timeout Base | 275µs minimum (CSRT = 0); sets shortest guaranteed hold time after VCC recovery |
| SRT Ramp Current | 240nA ±20%; defines linear charging rate for external timeout capacitor |
| VCC Operating Range | 1.0V to 5.5V; ensures functional reset assertion even during deep brownout |
| RESET Output Type | Open-drain; allows level-shifting, wired-OR, and multi-supply interface without level translators |
| VOL (ISINK = 500µA) | ≤0.3V at VCC ≥ 2.7V; guarantees solid logic-low under typical µP input leakage loads |
Pinout & Package
MAX6425UK25-T is housed in a RoHS-compliant 5-pin SOT23-5 package (outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad option not included. Pin 1 is marked with a dot; pin numbering follows standard SOT23 convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and SRT ramp current sink |
| 2 | VCC | Supply input and monitored voltage rail; powers device and sets reset threshold reference |
| 3 | N.C. | No internal connection; may be tied to GND for mechanical stability or left floating |
| 4 | SRT | Set-reset-time input; accepts external capacitor to program timeout period via 240nA ramp |
| 5 | RESET | Active-low open-drain output; sinks current when asserted; requires external pullup |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific hold times (e.g., 10ms–1s) without firmware or external timers |
| Open-drain RESET with 5.5V tolerance | Permits direct interface to 1.8V, 3.3V, or 5V µP reset inputs using a single pullup resistor |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during ultra-low-power wake-up or backup-battery operation |
| Immunity to short VCC transients | Rejects <50µs glitches below threshold, eliminating false resets in noisy power environments |
| Low 1.6µA quiescent current | Minimizes standby power draw in portable and energy-harvesting systems |
Applications
| Battery-Powered Controllers | Automotive Body Control Modules |
|---|---|
|
Use Scenario: A handheld medical glucose meter uses coin-cell power and must guarantee clean µP restart after battery insertion or voltage sag. IC Role / Device Role / Timing Role: MAX6425UK25-T monitors VCC and asserts open-drain RESET until stable 2.5V is reached and held for programmable timeout. Use Value: Prevents erratic boot sequences by enforcing minimum reset pulse width independent of µP clock speed or firmware timing. |
Use Scenario: A 12V automotive body control unit powers auxiliary modules via local LDOs; brownout on main rail must trigger coordinated system reset. IC Role / Device Role / Timing Role: MAX6425UK25-T senses LDO output (2.5V) and drives shared wired-OR RESET bus with other supervisors. Use Value: Enables multi-rail fault coordination without additional logic gates or microcontroller intervention. |
| Portable Industrial Sensors | Medical Infusion Pumps |
|
Use Scenario: An IIoT vibration sensor node sleeps at 5µA but must recover reliably after intermittent solar charging causes slow VCC ramp-up. IC Role / Device Role / Timing Role: MAX6425UK25-T holds RESET active until VCC exceeds 2.5V and remains above threshold for ≥100ms (CSRT = 33nF). Use Value: Eliminates need for µP-based power-good polling, reducing firmware complexity and wake-up latency. |
Use Scenario: A Class II medical infusion pump requires fail-safe reset during AC/DC adapter switchover or battery depletion events. IC Role / Device Role / Timing Role: MAX6425UK25-T monitors 2.5V system rail and asserts RESET with guaranteed low VOL (<0.3V) to meet IEC 60601-1 logic-level safety margins. Use Value: Provides hardware-enforced reset timing that satisfies regulatory requirements for deterministic fault recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN25T1G | Fixed 2.5V threshold, no capacitor-adjustable timeout; 0.9µA IQ; SOT23-5 | Lacks programmable delay; suitable only where fixed 200ms timeout suffices | Choose when minimal IQ and BOM simplification outweigh need for timeout tuning |
| TLV803EB25DBZR | 2.5V threshold, 350ms fixed timeout, push-pull output; SOT23-3 | Push-pull eliminates external pullup but limits voltage translation capability | Prefer when system uses single-supply µP and board space is constrained to 3-pin footprint |
Compared with NCP302LSN25T1G and TLV803EB25DBZR, the MAX6425UK25-T uniquely combines open-drain flexibility, capacitor-programmable timeout, and guaranteed 1V operation-making it optimal for multi-rail, battery-critical, or transient-immune designs where timing and interface adaptability are essential.
Availability
MAX6425UK25-T is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6425UK25-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX6421–MAX6426 family was designed specifically for ultra-low-power, capacitor-programmable reset supervision in size- and energy-constrained embedded systems where precision threshold accuracy and flexible timeout are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6425UK25-T?
The MAX6425UK25-T has a factory-laser-trimmed nominal reset threshold of 2.500V, 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 under suffix "25", and is measured at VCC = 2.5V to 5.0V per Electrical Characteristics.
How do I calculate the external capacitor value for a desired reset timeout on the MAX6425UK25-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 100ms timeout requires CSRT ≈ 36.6nF. The datasheet specifies ceramic capacitors with <10nA leakage are recommended, and layout near the SRT pin must minimize stray capacitance.
Can the MAX6425UK25-T drive a 5V µP reset input while powered from a 3.3V supply?
Yes. The MAX6425UK25-T's open-drain RESET output is rated to 5.5V, allowing an external pullup resistor to 5V-even when VCC = 3.3V. This enables direct level-shifting without translators. Ensure the pullup resistor (e.g., 47kΩ) provides sufficient current to meet the µP's input leakage and capacitance requirements.
Does the MAX6425UK25-T remain functional when VCC drops below 1.6V?
Yes. The MAX6425UK25-T is fully specified down to VCC = 1.0V, with guaranteed reset assertion and valid open-drain output sinking capability (VOL ≤ 0.3V at ISINK = 500µA) throughout this range. Its "guaranteed reset valid to VCC = 1V" feature ensures reliable operation during deep brownout or backup battery transitions.
What is the purpose of the N.C. pin (Pin 3) on the MAX6425UK25-T?
Pin 3 of the MAX6425UK25-T is Not Connected internally. It may be left unconnected or tied to GND for mechanical stability or PCB routing convenience. It carries no electrical function and must not be used as a signal or power path, as doing so could compromise thermal or electrical performance per the manufacturer's pin description table.
MAX6425UK25-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:
- 2.5V
- 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
MAX6425UK25-T FAQ
1.How can I place an order for MAX6425UK25-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK25-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 MAX6425UK25-T reliable?
The price and inventory of MAX6425UK25-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK25-T is usually 5 days.
3.What payment methods are accepted for MAX6425UK25-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK25-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK25-T?
MAX6425UK25-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK25-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 MAX6425UK25-T?
For technical support, including MAX6425UK25-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK25-T requirements.
6.How does Aetrix verify that MAX6425UK25-T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK25-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 MAX6425UK25-T meets industry standards.
7.What is the process for return or replacement of MAX6425UK25-T?
All MAX6425UK25-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK25-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 MAX6425UK25-T part is unused and in its original packaging.
Return procedure for MAX6425UK25-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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