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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:3,449
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Product details
Overview
MAX6425UK25+T from Analog Devices is a low-power microprocessor supervisor IC with active-low open-drain reset output, 2.5V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (3.0–5.75ms at CSRT = 1500pF), and guaranteed operation down to VCC = 1V. It monitors supply voltage in portable battery-powered systems and asserts reset during brownout or power-up sequencing.
For engineers reviewing the MAX6425UK25+T datasheet, MAX6425UK25+T pinout, MAX6425UK25+T application, or MAX6425UK25+T equivalent, key selection factors include its SOT23-5 open-drain output compatibility with mixed-voltage µP interfaces, ultra-low 1.6µA quiescent current at 2V, and immunity to sub-50µs VCC transients exceeding 100mV below threshold.
Technical Context
The MAX6425UK25+T implements a precision voltage-detection circuit using laser-trimmed resistors to set a 2.5V reset threshold with ±2.5% accuracy across –40°C to +125°C. Its internal 240nA current source charges an external capacitor on the SRT pin to generate a programmable reset timeout period.
Reset assertion occurs when VCC falls below the threshold; deassertion requires both VCC rise above threshold and full ramp of the SRT capacitor to 0.65V. The open-drain RESET output supports wired-OR configuration and logic-level translation via external pullup to any supply ≤5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.500V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout | 3.00–5.75ms at CSRT = 1500pF - configurable via external capacitor to match µP reset timing requirements |
| Supply Range | 1.0V to 5.5V - guarantees valid reset assertion even during deep brownout conditions |
| Output Type | Active-low open-drain - allows level-shifting, wired-OR reset combining, and interface with 1.8V/3.3V/5V µPs |
| VCC Transient Immunity | No reset for ≤50µs negative transients ≥100mV below threshold - prevents false resets from noise or switching spikes |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
Pinout & Package
MAX6425UK25+T is housed in a 5-pin SOT23-5 package (package code U5+2, outline 21-0057) with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal circuitry and SRT capacitor discharge; must connect to system ground plane |
| 2 - VCC | Supply and monitor input | Primary power rail monitored for reset condition; operates down to 1.0V with valid reset output |
| 3 - SRT | Reset timeout capacitor input | Connects to external capacitor (CSRT); 240nA internal current source sets tRP = 2.73×10⁶×CSRT + 275µs |
| 4 - N.C. | No internal connection | Not bonded; may be left floating or tied to GND for mechanical stability - no electrical function |
| 5 - RESET | Active-low open-drain output | Drives low during reset; requires external pullup (10kΩ–100kΩ) to target logic supply (0–5.5V) |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise timing alignment with diverse µP reset requirements without firmware changes or BOM variants |
| Open-drain RESET output | Supports multi-supply logic interfacing and wired-OR reset combining with auxiliary supervisors or watchdog circuits |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system behavior during deep undervoltage events where most µPs cease operation |
| 240nA SRT ramp current | Minimizes capacitor leakage sensitivity and enables use of standard X7R ceramics instead of costly low-leakage types |
| ±2.5% reset threshold accuracy over temp | Reduces need for margining in critical power-rail monitoring, especially in automotive and medical applications |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Wearable ECG patch operating from coin-cell battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset if battery drops below 2.5V during cold start or aging. Use Value: Prevents corrupted sensor data logging by ensuring µP only runs within validated supply range; 1.6µA ICC extends battery life beyond 3 years. |
Use Scenario: LIN-based door module subjected to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown before MCU enters undefined state. Use Value: Eliminates need for external RC timing network; open-drain output interfaces directly to 5V LIN transceiver's reset input. |
| Industrial IoT Edge Node | Set-Top Box Power Sequencing |
|
Use Scenario: LoRaWAN node powered by supercapacitor backup during AC outage. IC Role / Device Role / Timing Role: Monitors 3.3V rail derived from buck converter; holds µP in reset until stable post-power-fail recovery. Use Value: Configurable 4.375ms timeout (CSRT = 1500pF) matches FPGA configuration time, avoiding race conditions. |
Use Scenario: Multi-rail STB with 12V, 5V, and 3.3V supplies requiring coordinated reset release. IC Role / Device Role / Timing Role: Secondary supervisor verifying 3.3V rail integrity before enabling main SoC reset release. Use Value: Open-drain output enables wired-OR with primary 5V supervisor, creating unified reset signal for all subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN25T1G | Fixed 2.5V threshold, 200ms min timeout, push-pull output, no SRT pin | Lacks timeout adjustability and open-drain flexibility; requires PCB redesign for pullup removal | Select when fixed long timeout suffices and push-pull simplifies layout |
| TLV803EB25DBZR | 2.5V threshold, 140ms min timeout, open-drain, but 3.5µA ICC at 2V (vs. 1.6µA) | Higher quiescent current reduces battery life; same SOT23-5 footprint but different pinout (RESET on pin 3) | Choose only if legacy design uses TLV803 pinout and 140ms timeout is acceptable |
Compared with NCP302LSN25T1G and TLV803EB25DBZR, the MAX6425UK25+T uniquely combines capacitor-adjustable timeout, ultra-low 1.6µA current, and verified open-drain interoperability with mixed-voltage µPs - making it optimal for space-constrained, battery-sensitive designs requiring timing flexibility.
Availability
MAX6425UK25+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial IoT edge nodes requiring stable component supply with full lifecycle support.
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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The MAX6425UK25+T belongs to the MAX6340/MAX6421–MAX6426 family of low-power µP supervisors designed specifically for battery-operated and thermally demanding embedded systems requiring accurate, flexible, and robust power-monitoring solutions.
FAQ
What is the exact reset threshold voltage tolerance for MAX6425UK25+T over temperature?
The MAX6425UK25+T has a nominal reset threshold of 2.500V with ±2.5% accuracy over the full –40°C to +125°C operating range. At +25°C, tolerance tightens to ±1.5%. This is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table under VTH parameter.
Can MAX6425UK25+T operate reliably when VCC drops below 1.5V?
Yes - the MAX6425UK25+T guarantees valid reset output down to VCC = 1.0V. Below 1.0V, RESET output capability degrades, but the device continues asserting reset until VCC rises above threshold. This ensures deterministic behavior during deep brownout events common in battery-powered systems.
How do I calculate the SRT capacitor value for a 10ms reset timeout with MAX6425UK25+T?
Use the formula CSRT = (tRP – 275µs) / 2.735×10⁶, where tRP is in seconds. For 10ms: CSRT = (0.01 – 0.000275) / 2.735×10⁶ = 3.55nF. A standard 3.6nF ceramic capacitor yields ~10.1ms timeout. Select X7R or C0G dielectric with <10nA leakage.
Is MAX6425UK25+T pin-compatible with other devices in the MAX642x family?
Yes - MAX6425UK25+T shares identical 5-pin SOT23-5 pinout with MAX6340, MAX6424, and MAX6426. Pin 1 = GND, Pin 2 = VCC, Pin 3 = SRT, Pin 4 = N.C., Pin 5 = RESET. This enables drop-in replacement across threshold variants without layout change.
Does MAX6425UK25+T require an external pullup resistor on the RESET pin?
Yes - because MAX6425UK25+T features an open-drain RESET output, an external pullup resistor (10kΩ–100kΩ) to a logic supply (0–5.5V) is mandatory. Without it, RESET cannot transition high after timeout, causing permanent system reset. Pullup value balances speed vs. power consumption.
MAX6425UK25+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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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