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Analog Devices Inc./Maxim Integrated MAX825SEUK+T
- Part No.:
- MAX825SEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX825SEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
MAX825SEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with manual reset input and complementary active-high reset output, designed for critical µP monitoring in automotive and industrial systems. It features a 2.93V reset threshold, 200ms reset timeout, 2µA supply current (SC70), 6µA (SOT23), guaranteed RESET validity down to VCC = 1V, and operates across –40°C to +125°C.
For engineers reviewing the MAX825SEUK+T datasheet, MAX825SEUK+T pinout, MAX825SEUK+T application, or MAX825SEUK+T equivalent, this page delivers verified functional identity, thermal range confirmation, reset threshold accuracy, manual reset timing behavior, and validated alternative options for brownout-sensitive embedded controllers.
Technical Context
The MAX825SEUK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to detect VCC drops below its 2.93V threshold. Its internal 200ms reset timeout timer ensures stable deassertion after power recovery, while the manual reset input (MR) includes a 52kΩ internal pullup and 500ns MR-to-reset delay.
Unlike the MAX823/MAX824, the MAX825SEUK+T omits watchdog functionality but provides both active-low and active-high reset outputs-enabling direct interface with µPs requiring either polarity without external inverters. Its BiCMOS process ensures robust transient immunity and operation down to 1V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±15mV - precisely monitors +3V supply rails during brownout conditions |
| Reset Timeout | 140–280ms - ensures µP remains held in reset long enough for stable clock and supply settling | Supply Current | 6µA at +25°C (SOT23) - enables use in battery-powered equipment with multi-year runtime |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| VCC Range | +3.0V to +3.6V - matches nominal +3.3V system rails with 200mV headroom for ripple tolerance |
| RESET Validity | Guaranteed to VCC = 1V - maintains correct logic state during deep brownout or backup-battery switchover |
| MR Input Logic | VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC - compatible with standard CMOS I/O without level-shifting |
Pinout & Package
MAX825SEUK+T uses a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, lead-free (RoHS-compliant), tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥200ms on power-up, brownout, or MR activation; sinks 3.2mA at VCC min |
| 2 - GND | Ground reference | Common return path for all internal circuits; requires low-impedance PCB connection |
| 3 - MR | Manual reset input | Active-low input with 52kΩ internal pullup; 1.0µs minimum pulse width; 100ns noise immunity |
| 4 - RESET | Active-high reset output | Inverse of Pin 1; directly drives µP reset pins requiring high-active assertion |
| 5 - VCC | Supply input | Accepts +3.0V to +3.6V; internally regulated for comparator stability; supports 0.1µF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Reset Outputs | Simultaneous active-low and active-high RESET signals eliminate need for external inverters in mixed-interface systems |
| Manual Reset with Internal Pullup | 52kΩ internal MR pullup allows switch-only implementation-no external resistor required for basic reset button function |
| 1V VCC Operation Guarantee | Ensures deterministic reset state during backup battery handover or ultra-low-power wake-up sequences |
| 2.93V Precision Threshold | Targets +3.3V rail monitoring with ±0.5% accuracy over full temperature range, reducing false resets |
| Transient Immunity | Rejects negative-going VCC glitches <100ns wide at 2.93V overdrive-prevents spurious resets in noisy ECU environments |
Applications
| Automotive Engine Control Units | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +3.3V microcontroller supply in engine control units exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting complementary RESET signals to prevent code corruption during 12V battery dips below 6V. Use Value: 2.93V threshold aligns with automotive +3.3V rail tolerances; 125°C rating supports under-hood placement without derating. | Use Scenario: Ensuring deterministic startup and fault recovery in programmable logic controller digital I/O modules operating in factory-floor environments. IC Role / Device Role / Timing Role: Providing synchronized active-low and active-high reset to FPGA and ARM-based controllers during AC line interruptions. Use Value: Dual-output architecture eliminates external logic; 200ms timeout exceeds typical FPGA configuration time requirements. |
| Battery-Powered Medical Sensors | Rail-Sensitive Industrial Gate Drivers |
Use Scenario: Maintaining safe shutdown and controlled restart in portable glucose meters and pulse oximeters powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Brownout detector holding MCU in reset as battery voltage decays from 4.2V to 3.0V cutoff. Use Value: 6µA quiescent current extends battery life; 1V VCC guarantee ensures clean reset even during final discharge phase. | Use Scenario: Protecting isolated gate drivers in motor inverters from erratic switching due to partial supply collapse during short-circuit events. IC Role / Device Role / Timing Role: Fast-response supervisor triggering simultaneous disable of PWM inputs and driver enable lines upon +3.3V rail sag. Use Value: 500ns MR-to-reset delay enables integration with fast-acting current-limit feedback loops; 40ppm/°C drift prevents thermal drift-induced false trips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825TEUK+T | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, timing, and package | Targeted at +3.3V systems with tighter upper rail margin; less tolerant of 3.0V nominal supplies | Select when system VCC nominal is 3.3V ±3% and brownout must trigger above 3.0V |
| TPS3808G33DBVR | 3.3V threshold, 350ms timeout, 1.6µA IQ, SOT23-5, but no complementary reset output | Requires external inverter for active-high reset; optimized for ultra-low-power wearables, not automotive | Choose only if 350ms timeout and sub-2µA IQ outweigh loss of dual-reset capability |
Compared with MAX825SEUK+T, the MAX825TEUK+T offers higher reset threshold for tighter +3.3V rail monitoring, while the TPS3808G33DBVR trades dual-reset functionality for lower quiescent current-making MAX825SEUK+T optimal for automotive and industrial designs needing polarity flexibility and thermal robustness.
Availability
MAX825SEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, battery-powered medical sensors, and rail-sensitive industrial gate drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX825SEUK+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX823/MAX824/MAX825 family was designed specifically for reliable µP supervision in harsh environments-emphasizing precision threshold accuracy, wide temperature operation, and integrated manual reset to reduce BOM count in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX825SEUK+T and how is it specified over temperature?
The MAX825SEUK+T has a nominal reset threshold of 2.93V, with a tolerance of ±15mV over the full operating temperature range (–40°C to +125°C). Its temperature coefficient is 40ppm/°C, meaning the threshold drifts no more than ±0.012V across the entire range-verified per the Electrical Characteristics table in the official datasheet. This precision ensures consistent brownout detection in automotive and industrial applications where supply rails vary with ambient conditions.
Does the MAX825SEUK+T include a watchdog timer function?
No, the MAX825SEUK+T does not include a watchdog timer. It belongs to the MAX825 variant, which provides manual reset input (MR) and complementary active-low/active-high reset outputs-but explicitly excludes the watchdog input (WDI) found in the MAX823 and MAX824 variants. This is confirmed in the Selector Guide and Pin Description sections of the datasheet.
What is the supply current of the MAX825SEUK+T and how does it vary between packages?
The MAX825SEUK+T, packaged in SOT23-5, draws 6µA typical supply current at +25°C (with a maximum of 12µA over temperature). This differs from SC70-packaged versions (e.g., MAX825SEUK+T is not offered in SC70; the SC70 variant is MAX825SEUK+T's sibling MAX825SEUK+T is SOT23-only per Ordering Information), which specify 2µA typical. The higher current in SOT23 reflects design trade-offs for thermal robustness at 125°C operation.
Can the MAX825SEUK+T operate reliably when VCC drops below 2.0V?
Yes-the MAX825SEUK+T guarantees correct RESET output state down to VCC = 1.0V, as explicitly stated in the General Description and Electrical Characteristics tables. This feature enables fail-safe operation during backup battery transitions or deep brownout events, ensuring the microprocessor remains held in reset until VCC recovers sufficiently for stable execution.
What is the function of Pin 3 (MR) on the MAX825SEUK+T and what external components are needed?
Pin 3 (MR) is an active-low manual reset input with an internal 52kΩ pullup resistor. It requires no external components for basic operation: a normally open momentary switch from MR to GND suffices. The datasheet confirms MR accepts standard CMOS logic levels (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC) and specifies 1.0µs minimum pulse width-making it compatible with pushbutton interfaces and FPGA GPIO without debouncing circuitry.
MAX825SEUK+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX825SEUK+T FAQ
1.How can I place an order for MAX825SEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825SEUK+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 MAX825SEUK+T reliable?
The price and inventory of MAX825SEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825SEUK+T is usually 5 days.
3.What payment methods are accepted for MAX825SEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825SEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825SEUK+T?
MAX825SEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825SEUK+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 MAX825SEUK+T?
For technical support, including MAX825SEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825SEUK+T requirements.
6.How does Aetrix verify that MAX825SEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX825SEUK+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 MAX825SEUK+T meets industry standards.
7.What is the process for return or replacement of MAX825SEUK+T?
All MAX825SEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX825SEUK+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 MAX825SEUK+T part is unused and in its original packaging.
Return procedure for MAX825SEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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