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Analog Devices Inc./Maxim Integrated MAX811MEUS+T
- Part No.:
- MAX811MEUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811MEUS+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:7,198
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Product details
Overview
MAX811MEUS+T from Maxim Integrated is a low-power microprocessor supervisory circuit that monitors 4.38V supply rails and asserts an active-low reset signal for ≥140ms after VCC rises above threshold; it features manual reset input, guaranteed RESET validity down to VCC = 1V, and operates in -40°C to +85°C industrial temperature range for embedded μP power monitoring.
For engineers reviewing the MAX811MEUS+T datasheet, MAX811MEUS+T pinout, MAX811MEUS+T application, or MAX811MEUS+T equivalent, this page delivers verified reset threshold (4.38V), supply current (6µA), timeout duration (140–560ms), MR glitch immunity (100ns), and SOT143 package details essential for brownout protection and portable system design.
Technical Context
The MAX811MEUS+T implements a precision voltage comparator with internal 4.38V reset threshold and a monostable timer that enforces minimum 140ms reset pulse width after VCC recovery. Its reset logic remains functional down to VCC = 1V, ensuring deterministic state initialization during deep brownouts.
It integrates a debounced manual reset input (MR) with 20kΩ internal pull-up, 10µs minimum pulse width requirement, and 100ns glitch immunity-enabling direct switch connection without external RC networks. The device ignores fast VCC transients ≤40µs (for L/M variants) at 125mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (±0.13V over -40°C to +85°C); ensures reliable detection of 5V ±5% supply undervoltage before downstream ICs fail. |
| Supply Current | 6µA typical at 5.5V; enables multi-year battery life in portable equipment without compromising supervision integrity. |
| Reset Timeout | 140ms minimum, up to 560ms maximum; guarantees sufficient μP initialization time across full temperature range. |
| MR Glitch Immunity | 100ns; rejects EMI-induced noise on manual reset line without external filtering. |
| VCC to RESET Delay | 40µs (at 125mV overdrive); provides rapid response to supply collapse while ignoring sub-40µs transients. |
| RESET Validity Range | Guaranteed logic-low output down to VCC = 1V; maintains valid reset assertion during deep brownout recovery. |
| Operating Temp | -40°C to +85°C; qualified for industrial and automotive under-hood environments requiring extended thermal stability. |
Pinout & Package
MAX811MEUS+T is housed in a 4-pin SOT143 surface-mount package (outline 21-0052, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and timer; must be connected directly to system ground plane for noise immunity. |
| 2 | RESET | Active-low open-drain reset output; sinks ≥3.2mA at VCC = VTH(MIN); requires external pull-up for CMOS-compatible logic levels. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 20kΩ resistor; accepts TTL/CMOS logic or momentary switch to GND. |
| 4 | VCC | Primary power supply input (1.2V to 5.5V); powers internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, comparator, and timing capacitor eliminate BOM cost and layout area for basic reset supervision. |
| Manual reset with internal pull-up | 20kΩ MR pull-up enables single-switch implementation-no external resistor needed unless noise immunity demands 0.1µF MR-to-GND decoupling. |
| Reset assertion below 1V VCC | Ensures μP remains held in reset until stable supply is fully restored-even during partial power collapse scenarios. |
| Transient-immune comparator | Rejects VCC glitches ≤40µs (L/M variants) at 125mV overdrive, preventing spurious resets in electrically noisy environments. |
| Lead(Pb)-free RoHS-compliant packaging | +T suffix denotes lead-free SOT143 construction per JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). |
Applications
| Industrial PLC Controllers | Portable Medical Devices |
|---|---|
|
Use Scenario: Power sequencing and brownout recovery in programmable logic controllers exposed to fluctuating 24V DC supplies converted to 5V/3.3V rails. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 μP during undervoltage events and manual maintenance reset. Use Value: Prevents firmware corruption by guaranteeing ≥140ms reset hold time after 4.38V rail recovery-matching μP minimum reset duration requirements. |
Use Scenario: Battery-powered glucose meters and handheld ultrasound units requiring ultra-low quiescent current and reliable cold-start behavior. IC Role / Device Role / Timing Role: Voltage monitor enabling safe boot sequence initiation only when Li-ion battery output exceeds 4.38V after charge/discharge cycles. Use Value: 6µA supply current extends single-cell battery life beyond 5 years in standby; RESET validity to 1V prevents erratic behavior during end-of-life voltage sag. |
| Network Edge Routers | Automotive Infotainment Modules |
|
Use Scenario: Dual-rail (5V + 3.3V) power management in fanless edge routers where thermal derating limits supply margin. IC Role / Device Role / Timing Role: Dedicated 4.38V supervisor for main SoC power domain, interfacing via series 4.7kΩ resistor to bidirectional reset I/O. Use Value: Internal 100ns MR glitch immunity eliminates need for external Schmitt-trigger debounce, reducing component count in high-density routing layers. |
Use Scenario: Reset coordination between infotainment head unit MCU and display driver ASIC during vehicle ignition and accessory mode transitions. IC Role / Device Role / Timing Role: Primary reset generator asserting synchronized low-active signal to both processors upon 12V-to-5V converter undervoltage. Use Value: Guaranteed reset assertion down to VCC = 1V ensures deterministic shutdown even during abrupt battery disconnect or alternator failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V fixed threshold, 350ms min reset timeout, 1.4µA supply current, SOT-23-5 package. | Lacks manual reset input; optimized for ultra-low-power always-on monitoring rather than operator-initiated reset. | Select when minimal quiescent current and no MR function are prioritized over field-serviceability. |
| ADM6710SARJZ-RL7 | 4.38V threshold, 200ms min timeout, 12µA supply current, SC70-5 package; includes watchdog timer. | Includes independent watchdog functionality but requires external capacitor for timeout adjustment and lacks integrated MR pull-up. | Choose when system-level fault recovery (beyond power monitoring) justifies added complexity and higher ICC. |
Compared with TPS3808G33DBVR and ADM6710SARJZ-RL7, the MAX811MEUS+T uniquely combines 4.38V precision threshold, guaranteed 1V operation, integrated MR pull-up, and 4-pin SOT143 footprint-making it optimal for cost-sensitive, space-constrained industrial controls requiring manual service reset capability.
Availability
MAX811MEUS+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical devices, network edge routers, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX811MEUS+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 industrial, communications, and computing applications.
The MAX811MEUS+T belongs to the MAX811/MAX812 family of micropower voltage supervisors engineered specifically for reliable power-on-reset and brownout protection in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for MAX811MEUS+T?
The MAX811MEUS+T has a nominal reset threshold of 4.38V, with guaranteed tolerance of 4.25V to 4.50V over the full -40°C to +85°C operating temperature range. This value is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table of the official datasheet revision 6.
Does MAX811MEUS+T support manual reset functionality, and how is it implemented?
Yes, MAX811MEUS+T supports manual reset via its MR pin (Pin 3), which is an active-low input with an internal 20kΩ pull-up resistor. A momentary switch from MR to GND initiates reset; no external components are required. The device holds RESET low for ≥140ms after MR returns high, providing built-in debouncing.
Can MAX811MEUS+T operate reliably when VCC drops below 1V?
MAX811MEUS+T guarantees correct RESET output state (logic low) for VCC down to 1V. Below 1V, the RESET output becomes high-impedance. For applications requiring valid reset signaling down to 0V, a 100kΩ pulldown resistor on the RESET pin is recommended per Maxim's application guidance.
What is the supply current consumption of MAX811MEUS+T at 5.5V?
At VCC = 5.5V and TA = +25°C, the MAX811MEUS+T draws 6µA typical supply current (ICC), with a maximum of 15µA over temperature. This ultra-low quiescent current makes it ideal for battery-backed and energy-harvesting systems where standby power budget is critical.
Is MAX811MEUS+T pin-compatible with other members of the MAX811/MAX812 family?
Yes, all MAX811/MAX812 variants-including MAX811MEUS+T-share identical 4-pin SOT143 pinout and footprint. The only functional differences are reset threshold voltage (determined by suffix letter) and RESET polarity (MAX811 = active-low, MAX812 = active-high); electrical and mechanical compatibility is maintained across the family.
MAX811MEUS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX811MEUS+T FAQ
1.How can I place an order for MAX811MEUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811MEUS+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 MAX811MEUS+T reliable?
The price and inventory of MAX811MEUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811MEUS+T is usually 5 days.
3.What payment methods are accepted for MAX811MEUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811MEUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811MEUS+T?
MAX811MEUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811MEUS+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 MAX811MEUS+T?
For technical support, including MAX811MEUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811MEUS+T requirements.
6.How does Aetrix verify that MAX811MEUS+T is sourced from the original manufacturer or authorized distributors?
All MAX811MEUS+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 MAX811MEUS+T meets industry standards.
7.What is the process for return or replacement of MAX811MEUS+T?
All MAX811MEUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX811MEUS+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 MAX811MEUS+T part is unused and in its original packaging.
Return procedure for MAX811MEUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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