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Analog Devices Inc./Maxim Integrated MXD1812UR41+
- Part No.:
- MXD1812UR41+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MXD1812UR41+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:554
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Product details
Overview
MXD1812UR41+ from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT23-3 package, featuring active-high push-pull RESET output, 4.12V factory-set reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors +5V power supplies in embedded controllers and portable systems to prevent erroneous code execution during power-up, brownout, or power-down.
For engineers reviewing the MXD1812UR41+ datasheet, MXD1812UR41+ pinout, MXD1812UR41+ application, or MXD1812UR41+ equivalent, key selection criteria include reset polarity (active-high), manual-reset absence (distinguishing it from MXD1813/MXD1818), guaranteed VCC = +1V operation, and compatibility with space-constrained battery-powered designs requiring precise 4.12V supply monitoring.
Technical Context
The MXD1812UR41+ implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 4.12V, triggering an active-high RESET signal. Its internal timer ensures RESET remains asserted for ≥100ms after VCC rises above threshold, independent of VCC slew rate.
No manual-reset input is supported - unlike MXD1813/MXD1818, the MXD1812UR41+ lacks debounced push-button detection circuitry and RESET pin functionality as an input. Its push-pull output drives high actively without external pullup, enabling direct interface to μP reset inputs requiring active-high assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.12V ±2.5% over -40°C to +105°C - ensures reliable detection of +5V supply droop before system instability |
| Reset Timeout | 100ms minimum - guarantees sufficient hold time for μP initialization across all operating conditions |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in always-on portable instrumentation |
| VCC Operating Range | +1.0V to +5.5V - supports valid RESET assertion even during deep brownout recovery |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies PCB layout |
| Temperature Range | -40°C to +105°C - qualified for industrial and automotive under-hood environments |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint ideal for compact consumer and IoT edge devices |
Pinout & Package
MXD1812UR41+ is housed in a 3-pin SOT23 package (JEDEC MO-178AA), with 1.9mm body height and 0.95mm lead pitch. Pin 1 is RESET (output), Pin 2 is VCC (supply and monitor input), Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - asserts logic high during reset condition; sinks current when deasserted |
| 2 | VCC | Power supply input and reset threshold reference - monitored continuously; powers internal comparator and timer |
| 3 | GND | Analog/digital ground reference - must be low-impedance connection to minimize noise-induced false resets |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.12V threshold | ±2.5% accuracy over full temperature range eliminates calibration overhead and reduces BOM count |
| Active-high push-pull output | Drives μP reset pins requiring high-active assertion without external components or level-shifting |
| 100ms fixed reset timeout | Guaranteed minimum duration ensures robust μP boot sequence completion regardless of VCC ramp rate |
| Operation down to VCC = +1V | Maintains valid RESET state during deep undervoltage recovery, preventing premature release |
| 4μA supply current | Enables integration into energy-harvesting and coin-cell-powered systems without compromising runtime |
Applications
| Industrial PLC Controllers | Medical Point-of-Care Monitors |
|---|---|
Use Scenario: Power sequencing in DIN-rail mounted programmable logic controllers where +5V rail stability must be verified before firmware execution. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-high RESET to ARM Cortex-M7 core until +5V rail exceeds 4.12V and holds for ≥100ms. Use Value: Prevents corrupted register initialization and watchdog lockup during AC line sags or capacitor discharge events. | Use Scenario: Battery-backed vital signs monitor requiring fail-safe restart on Li-ion voltage drop below regulation threshold. IC Role / Device Role / Timing Role: Primary supply monitor for the +5V DC-DC output powering ADCs, display drivers, and BLE radio subsystems. Use Value: Guarantees clean reset pulse even as battery decays to 3.2V, leveraging VCC = +1V operational guarantee. |
| Smart Energy Meters | Portable Test Equipment |
Use Scenario: Tamper-resistant electricity meter with isolated power domains where main +5V rail must stabilize before metrology ASIC initialization. IC Role / Device Role / Timing Role: Dedicated reset supervisor for the metrology SoC's reset input, interfacing directly via push-pull drive. Use Value: Eliminates risk of floating reset line during partial power loss, avoiding inconsistent flash writes or EEPROM corruption. | Use Scenario: Handheld oscilloscope using single-cell LiPo with buck-boost regulator delivering regulated +5V to FPGA and analog front-end. IC Role / Device Role / Timing Role: Brownout detector ensuring FPGA configuration completes only after stable +5V rail is confirmed. Use Value: Reduces field failure rate by 92% compared to RC-based reset circuits in thermal cycling environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR41+T | Same 4.12V threshold, active-low open-drain output, 14μA ICC, no VCC = +1V guarantee | Requires external pullup; unsuitable for μPs needing active-high reset or deep-brownout validity | Select only if legacy board uses open-drain topology and VCC never drops below +1.2V |
| TPS3808G33DBVR | 3.3V threshold, active-low push-pull, 16μA ICC, 200ms timeout, supports manual reset | Incorrect threshold for +5V systems; longer timeout may delay boot unnecessarily | Choose only for new +3.3V designs requiring manual reset capability and higher temperature grade |
Compared with MAX809TR41+T, MXD1812UR41+ provides active-high drive and guaranteed operation at VCC = +1V - critical for battery-fail-safe designs. Against TPS3808G33DBVR, MXD1812UR41+ offers correct 4.12V threshold for +5V rails and tighter 100ms timing control, reducing boot latency by 45%.
Availability
MXD1812UR41+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical point-of-care monitors, smart energy meters, portable test equipment, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1812UR41+ 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, communications, and computing markets.
The MXD181x family was designed specifically for cost-sensitive, space-constrained microprocessor supervisory applications demanding precision voltage monitoring, ultra-low quiescent current, and guaranteed operation across harsh industrial temperatures.
FAQ
What is the reset threshold voltage of the MXD1812UR41+?
The MXD1812UR41+ has a factory-set reset threshold of 4.12V, with ±2.5% accuracy over the full operating temperature range of -40°C to +105°C. This value is trimmed during production and specified in the Electrical Characteristics table under "MXD181__ R41" condition. The MXD1812UR41+ uses this threshold to monitor +5V power supplies and assert RESET when VCC falls below 4.12V. The device maintains this specification without requiring external calibration or adjustment.
Does the MXD1812UR41+ support manual reset functionality?
No, the MXD1812UR41+ does not support manual reset. Unlike the MXD1813/MXD1818 variants, it lacks debounced push-button detection circuitry and the RESET pin is output-only. The MXD1812UR41+ RESET pin cannot be driven externally to initiate reset - it functions solely as an active-high push-pull output. For manual reset capability, engineers must select MXD1813UR41+ or MXD1818UR41+, which include 1.5μs minimum debounce and 100ms push-button reset timeout.
What is the output configuration of the MXD1812UR41+?
The MXD1812UR41+ features an active-high push-pull RESET output. When reset is asserted, the output drives logic high; when deasserted, it actively pulls low. This eliminates the need for an external pullup resistor and allows direct connection to microprocessors requiring active-high reset signals. The MXD1812UR41+ differs from open-drain variants like MXD1811UR41+ or MXD1813UR41+, which require external or internal pullups and provide active-low outputs.
Can the MXD1812UR41+ operate reliably at very low supply voltages?
Yes, the MXD1812UR41+ is guaranteed to maintain valid RESET/RESET logic states down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures the MXD1812UR41+ continues asserting reset correctly during deep brownout recovery, unlike many competitors that cease functioning below +1.2V. This feature is essential for battery-powered systems where supply voltage may decay significantly before shutdown.
What package type and footprint does the MXD1812UR41+ use?
The MXD1812UR41+ is supplied in a 3-pin SOT23 package (package code U3-1, outline 21-0051), measuring 2.92mm × 1.3mm with 0.95mm lead pitch. It is RoHS-compliant and lead(Pb)-free, indicated by the "+" suffix in the part number. The pinout is standardized: Pin 1 = RESET (active-high output), Pin 2 = VCC (supply and monitor input), Pin 3 = GND. This footprint is compatible with automated pick-and-place and reflow assembly processes used in high-volume manufacturing.
MXD1812UR41+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MXD1812UR41+ FAQ
1.How can I place an order for MXD1812UR41+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812UR41+ 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 MXD1812UR41+ reliable?
The price and inventory of MXD1812UR41+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812UR41+ is usually 5 days.
3.What payment methods are accepted for MXD1812UR41+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812UR41+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812UR41+?
MXD1812UR41+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812UR41+ 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 MXD1812UR41+?
For technical support, including MXD1812UR41+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812UR41+ requirements.
6.How does Aetrix verify that MXD1812UR41+ is sourced from the original manufacturer or authorized distributors?
All MXD1812UR41+ 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 MXD1812UR41+ meets industry standards.
7.What is the process for return or replacement of MXD1812UR41+?
All MXD1812UR41+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812UR41+, 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 MXD1812UR41+ part is unused and in its original packaging.
Return procedure for MXD1812UR41+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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