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Analog Devices Inc./Maxim Integrated MAX824SEUK+T
- Part No.:
- MAX824SEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX824SEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,658
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Product details
Overview
MAX824SEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low and active-high reset outputs, watchdog timer (1.6s timeout), and precision +2.93V reset threshold. It operates from -40°C to +125°C, draws only 3µA typical supply current, and guarantees RESET validity down to VCC = 1V. It is used in automotive systems and critical µP monitoring where transient immunity and extended temperature operation are required.
For engineers reviewing the MAX824SEUK+T datasheet, MAX824SEUK+T pinout, MAX824SEUK+T application, or MAX824SEUK+T equivalent, key selection factors include its dual-reset output polarity, SOT23-5 package compatibility, +2.93V threshold accuracy over temperature, watchdog enable/disable behavior via WDI connection, and support for bidirectional µP reset pins with 400µA max pullup current.
Technical Context
The MAX824SEUK+T integrates a precision voltage comparator with 40ppm/°C temperature coefficient, a 1.6s watchdog timer cleared by WDI edge transitions, and independent reset timing logic that restarts on every VCC dip below 2.93V. Its dual-reset outputs (RESET and RESET) provide complementary signals without external inversion.
It features internal MR pullup (52kΩ), 140ms minimum power-on reset timeout, and guaranteed reset assertion during VCC fall to 1V - enabling reliable brownout detection in battery-powered and automotive applications where supply stability is marginal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +2.93V ±15mV at +25°C; ensures accurate power-fail detection for +3.0V/3.3V systems |
| Watchdog Timeout | 1.6s nominal; provides robust software execution monitoring with 1.12–2.40s tolerance |
| Supply Current | 3µA typical (SOT23); enables ultra-low-power operation in portable/battery equipment |
| Operating Temp | -40°C to +125°C; qualified for under-hood automotive and industrial embedded use |
| Reset Timeout | 140–280ms; holds µP in reset long enough for stable clock and supply settling |
| VCC Range | +3.0V to +3.6V; matches nominal +3.3V rail with 10% margin for ripple and droop |
| Reset Propagation | 20µs delay at 100mV overdrive; ensures fast response to supply transients |
Pinout & Package
MAX824SEUK+T is housed in a RoHS-compliant, lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Drives µP reset pin low during power-up, brownout, or watchdog timeout; sinks 1.2mA min |
| 2 - GND | Ground reference | Common return for all internal circuits; must be low-impedance connection to system ground plane |
| 3 - WDI | Watchdog input | Edge-sensitive input; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 4 - RESET | Active-high reset output | Complementary to pin 1; eliminates need for external inverter in dual-signal interfaces |
| 5 - VCC | Power supply input | Accepts +3.0V to +3.6V; internal regulator enables operation down to 1V with valid reset state |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low and active-high signals eliminate external logic for interface flexibility |
| 1.6s watchdog timer | Configurable via WDI edge detection; immune to noise-induced false triggers due to 50ns pulse rejection |
| +2.93V precision threshold | ±15mV tolerance over full temperature range supports tight-margin +3.0V/3.3V supply monitoring |
| 1V reset guarantee | Ensures deterministic µP reset assertion even during deep brownout or battery sag conditions |
| Internal MR pullup | 52kΩ resistor allows direct switch-to-ground manual reset without external components |
Applications
| Automotive Engine Control Unit | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller supply in engine control module exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting both RESET and RESET to coordinate cold-start initialization and watchdog recovery. Use Value: Dual outputs simplify interface to safety-critical MCU with separate reset and wake-up inputs; 125°C rating ensures reliability under hood. | Use Scenario: Providing fail-safe reset and watchdog supervision for ARM-based PLC CPU operating from regulated 3.3V rail. IC Role / Device Role / Timing Role: Voltage monitor and software execution watchdog; generates synchronized reset pulses on power-up and brownout. Use Value: 140ms minimum reset timeout meets IEC 61131-2 startup timing requirements; 3µA quiescent current minimizes standby drain. |
| Portable Medical Monitor | Battery-Powered IoT Sensor Node |
Use Scenario: Ensuring reliable boot and runtime supervision of low-power Cortex-M0+ in handheld diagnostic device powered by Li-ion battery. IC Role / Device Role / Timing Role: Precision +2.93V threshold tracks battery discharge curve; watchdog detects firmware lockup during sensor acquisition. Use Value: Valid reset down to VCC = 1V extends usable battery life; SC70/SOT23 pinout enables compact layout in space-constrained enclosure. | Use Scenario: Supervising ESP32-based wireless sensor node operating intermittently from coin cell or energy harvester. IC Role / Device Role / Timing Role: Reset generator and software watchdog; WDI driven by GPIO to confirm task completion before sleep. Use Value: 3µA supply current reduces average system power; 200pF max WDI load compatible with high-impedance GPIO drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX824TEUK+T | +3.08V reset threshold; same package, temp range, and dual-reset functionality | Better suited for +3.3V systems with tighter upper rail margin | Select when system VCC nominal is 3.3V with <3% tolerance and brownout detection must trigger above 3.0V |
| TLV803EB30DBVR | Single active-low reset; no watchdog or manual reset; 3.0V threshold; SOT23-5 | Lacks watchdog and complementary output; lower cost for basic reset-only use cases | Choose only if watchdog and dual-reset are unnecessary and design can tolerate single-output interface |
Compared with MAX824SEUK+T, the MAX824TEUK+T offers higher reset threshold for improved noise margin in noisy 3.3V rails, while TLV803EB30DBVR reduces BOM count in non-watchdog applications but requires external circuitry for dual-signal or manual reset capability.
Availability
MAX824SEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX824SEUK+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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX823/MAX824/MAX825 family was engineered specifically for high-reliability microprocessor supervision in harsh environments, combining reset, watchdog, and manual reset in minimal 5-pin packages with guaranteed operation down to 1V.
FAQ
What is the reset threshold voltage of the MAX824SEUK+T and how is it specified over temperature?
The MAX824SEUK+T has a nominal reset threshold of +2.93V, with ±15mV tolerance at +25°C and 40ppm/°C temperature coefficient. Over the full -40°C to +125°C range, the threshold remains within ±30mV of nominal, ensuring consistent brownout detection across automotive and industrial operating conditions. This specification is verified per the Electrical Characteristics table in the official MAX823/MAX824/MAX825 datasheet.
Does the MAX824SEUK+T support watchdog functionality, and how is it enabled or disabled?
Yes, the MAX824SEUK+T includes a 1.6s watchdog timer monitored via the WDI pin. It is enabled by toggling WDI (rising or falling edge) within each timeout period; leaving WDI unconnected or three-stated disables the watchdog, as the internal driver automatically services the timer every ~1.4s. The MAX824SEUK+T datasheet confirms this behavior in the "Watchdog Input" section and Figure 3 timing diagram.
What is the supply current consumption of the MAX824SEUK+T, and under what conditions is it measured?
The MAX824SEUK+T draws 3µA typical supply current (ISUPPLY) in SOT23-5 package at +25°C with MR unconnected, as specified in the Electrical Characteristics table. This value increases slightly over temperature but remains ≤8µA across -40°C to +125°C. The low quiescent current is achieved using BiCMOS process technology and is critical for battery-powered applications where the MAX824SEUK+T operates continuously.
Can the MAX824SEUK+T drive a microcontroller with a bidirectional reset pin, and what is its maximum pullup current?
Yes, the MAX824SEUK+T can interface directly with bidirectional µP reset pins such as those on the 68HC11. Its RESET output provides up to 400µA of pullup current (for T/S/R/Z/Y versions like MAX824SEUK+T) when driven high, allowing the µP to override and force reset low when needed. This capability is explicitly documented in the "Interfacing to µPs with Bidirectional Reset Pins" section of the MAX824SEUK+T datasheet.
What package type and lead finish does the MAX824SEUK+T use, and how is it marked?
The MAX824SEUK+T uses a 5-pin SOT23-5 package (JEDEC MO-178AA) with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix. Top-side marking is "AAAP" per Maxim's marking guide, corresponding to MAX824T in SOT23 package. This marking appears adjacent to pin 1, and the device is supplied in tape-and-reel format with 2500-piece minimum order quantity.
MAX824SEUK+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
MAX824SEUK+T FAQ
1.How can I place an order for MAX824SEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824SEUK+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 MAX824SEUK+T reliable?
The price and inventory of MAX824SEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824SEUK+T is usually 5 days.
3.What payment methods are accepted for MAX824SEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824SEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824SEUK+T?
MAX824SEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824SEUK+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 MAX824SEUK+T?
For technical support, including MAX824SEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824SEUK+T requirements.
6.How does Aetrix verify that MAX824SEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX824SEUK+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 MAX824SEUK+T meets industry standards.
7.What is the process for return or replacement of MAX824SEUK+T?
All MAX824SEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX824SEUK+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 MAX824SEUK+T part is unused and in its original packaging.
Return procedure for MAX824SEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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