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Analog Devices Inc./Maxim Integrated MXD1812UR44+
- Part No.:
- MXD1812UR44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MXD1812UR44+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
MXD1812UR44+ from Maxim Integrated is a low-power microprocessor reset IC with active-high push-pull RESET output, factory-set 4.37V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation from -40°C to +105°C in SOT23-3 package. It monitors +5V power supplies in embedded controllers and portable systems to prevent erroneous code execution during brownout or power-up.
For engineers reviewing the MXD1812UR44+ datasheet, MXD1812UR44+ pinout, MXD1812UR44+ application, or MXD1812UR44+ equivalent, key selection criteria include reset polarity (active-high), VCC validity down to +1V, transient immunity, no external components required, and compatibility with space-constrained industrial and battery-powered designs.
Technical Context
The MXD1812UR44+ integrates a precision voltage comparator with hysteresis and an internal timer to assert RESET when VCC falls below 4.37V and hold it active for ≥100ms after VCC rises above threshold. Its push-pull output drives high actively without external pullup, enabling direct interface to μP reset inputs requiring active-high assertion.
Unlike open-drain variants (e.g., MXD1813UR44+), this device lacks manual-reset debounce circuitry and does not respond to external low pulses on RESET. It guarantees valid RESET logic state down to VCC = +1V and rejects fast transients via built-in immunity design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for +5V systems |
| Reset Timeout Period | 100ms (min) - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint for high-density PCB layouts |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature applications |
Pinout & Package
MXD1812UR44+ is housed in a 3-pin SOT23 package (U3-1 outline). Pin 1 is RESET (active-high push-pull output), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during normal operation; pulls low only during reset assertion |
| 2 | VCC | Power supply input and reset threshold reference - monitors system voltage directly |
| 3 | GND | Ground reference for comparator and output stage - must be low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.37V threshold | Eliminates external resistor network and calibration for +5V systems |
| Active-high push-pull output | Directly interfaces with μPs requiring active-high reset (e.g., certain ARM Cortex-M series) |
| 100ms fixed reset timeout | Meets JEDEC JESD72B requirements for microprocessor power-on reset duration |
| 4µA supply current | Reduces quiescent power in always-on monitoring circuits by >90% vs. legacy reset ICs |
| VCC down to +1V guarantee | Ensures deterministic reset behavior during severe undervoltage conditions |
Applications
| Industrial PLC Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 5V auxiliary rails in programmable logic controllers subject to line fluctuations and EMI-induced transients. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-high signal to ARM-based controller upon VCC drop below 4.37V. Use Value: Prevents firmware corruption during factory floor voltage sags; 100ms timeout ensures full register initialization before code execution resumes. | Use Scenario: Power supervision in handheld glucose meters powered by single-cell Li-ion batteries with 4.2V–3.0V discharge profile. IC Role / Device Role / Timing Role: Reset supervisor detecting end-of-life battery collapse below 4.37V threshold to force controlled shutdown. Use Value: Guarantees safe data save and display blanking before brownout-induced memory corruption occurs. |
| Network Edge Routers | Automated Test Equipment |
Use Scenario: Monitoring +5V FPGA configuration supply in carrier-grade edge routers exposed to thermal cycling and load transients. IC Role / Device Role / Timing Role: Active-high reset source for Xilinx Zynq SoC, synchronized to power rail stability. Use Value: Push-pull drive ensures fast rise/fall edges into FPGA reset pin capacitance; ±2.5% threshold accuracy maintains timing margin across temperature. | Use Scenario: Reset coordination in modular ATE mainframes where multiple instrument modules share a common 5V backplane. IC Role / Device Role / Timing Role: Centralized reset arbiter ensuring all modules initialize synchronously after power-up or fault recovery. Use Value: 4µA quiescent current minimizes cumulative standby loss across dozens of channels; SOT23-3 footprint enables dense board layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR44+T | Same 4.37V threshold, active-low open-drain output, 14µA ICC, SC70-3 package | Requires external pullup; incompatible with active-high reset inputs | Select only if system design uses active-low reset architecture and board layout accommodates pullup resistor |
| TPS3808G33DBVR | 3.3V threshold, adjustable timeout, 1.6µA ICC, SOT23-6 package | Lower threshold unsuitable for +5V monitoring; extra pins for enable/timeout adjustment | Choose only for 3.3V systems needing programmable delay; not a functional substitute for MXD1812UR44+ |
Compared with MAX809TR44+T and TPS3808G33DBVR, MXD1812UR44+ uniquely delivers active-high push-pull output at 4.37V threshold in minimal SOT23-3 footprint-enabling direct replacement in +5V systems without layout changes or component additions.
Availability
MXD1812UR44+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical devices, network edge routers, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1812UR44+ 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 and mixed-signal ICs for industrial, communications, and computing markets, with emphasis on reliability, low power, and integration.
The MXD1810–MXD1818 family was engineered specifically for cost-sensitive, space-constrained microprocessor supervisory applications requiring factory-trimmed thresholds and zero-external-component operation in harsh environments.
FAQ
What is the reset threshold voltage of the MXD1812UR44+?
The MXD1812UR44+ has a factory-set reset threshold of 4.37V with ±2.5% accuracy over the full -40°C to +105°C operating temperature range. This value is guaranteed per the Electrical Characteristics table and applies specifically to the "R44" suffix variant. The threshold is designed for reliable monitoring of +5V power supplies during brownout events.
Does the MXD1812UR44+ support manual reset functionality?
No, the MXD1812UR44+ does not support manual reset. Only MXD1813/MXD1818 variants include debounced manual-reset detection on the RESET pin. The MXD1812UR44+ asserts reset solely based on VCC voltage falling below its 4.37V threshold and holds reset for ≥100ms after VCC recovers - no external push-button interaction is possible.
What is the output configuration of the MXD1812UR44+?
The MXD1812UR44+ features an active-high push-pull RESET output. Pin 1 drives high during normal operation and pulls low only when reset is asserted. This eliminates the need for an external pullup resistor and provides strong drive capability (350µA source current) compatible with standard CMOS reset inputs requiring active-high signaling.
Can the MXD1812UR44+ operate reliably at low supply voltages?
Yes, the MXD1812UR44+ guarantees correct RESET logic state down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset behavior during deep brownout conditions where other supervisors may fail to assert or maintain valid output levels.
Is the MXD1812UR44+ RoHS-compliant and lead-free?
Yes, the "+" suffix in MXD1812UR44+ explicitly denotes lead(Pb)-free, RoHS-compliant packaging per Maxim Integrated's ordering convention. The device meets EU RoHS Directive 2011/65/EU requirements and is manufactured using environmentally compliant processes without exemptions.
MXD1812UR44+ 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:
- -
MXD1812UR44+ FAQ
1.How can I place an order for MXD1812UR44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812UR44+ 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 MXD1812UR44+ reliable?
The price and inventory of MXD1812UR44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812UR44+ is usually 5 days.
3.What payment methods are accepted for MXD1812UR44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812UR44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812UR44+?
MXD1812UR44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812UR44+ 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 MXD1812UR44+?
For technical support, including MXD1812UR44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812UR44+ requirements.
6.How does Aetrix verify that MXD1812UR44+ is sourced from the original manufacturer or authorized distributors?
All MXD1812UR44+ 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 MXD1812UR44+ meets industry standards.
7.What is the process for return or replacement of MXD1812UR44+?
All MXD1812UR44+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812UR44+, 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 MXD1812UR44+ part is unused and in its original packaging.
Return procedure for MXD1812UR44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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