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Analog Devices Inc./Maxim Integrated MXD1812UR41+T
- Part No.:
- MXD1812UR41+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1812UR41+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
MXD1812UR41+T from Maxim Integrated is a precision microprocessor reset IC with active-high push-pull RESET output, 4.12V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and 4μA supply current. It monitors +5V systems in portable and industrial embedded applications where reliable power-on reset and brownout protection are critical.
For engineers reviewing the MXD1812UR41+T datasheet, MXD1812UR41+T pinout, MXD1812UR41+T application, or MXD1812UR41+T equivalent, this device delivers factory-trimmed voltage supervision with guaranteed logic validity down to VCC = +1V, transient-immune reset assertion, and SOT23-3 compatibility for space-constrained designs.
Technical Context
The MXD1812UR41+T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 4.12V threshold, with internal timer circuitry ensuring reset remains asserted ≥100ms after VCC rises above threshold. Its push-pull output drives high actively during reset, eliminating need for external pullup resistors.
Designed for +5V systems, it operates across -40°C to +105°C, draws only 4μA typical supply current at 3.6V, and maintains valid RESET output down to VCC = +1V - enabling robust reset behavior during deep brownout conditions without external support components.
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 collapse before microprocessor malfunction |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for full μP initialization after power recovery |
| Supply Current | 4μA typical at 3.6V - enables multi-year battery life in portable equipment |
| Output Type | Active-high push-pull - directly drives CMOS inputs without external pullup; sinks 10mA when asserted |
| Operating Voltage Range | 1.2V to 5.5V - supports valid reset assertion even during severe brownout (down to 1.2V) |
| VCC Validity Limit | RESET output guaranteed valid to VCC = +1V - prevents indeterminate state during deep undervoltage |
| Package | SOT23-3 - industry-standard 3-pin footprint compatible with DS181x family and automated assembly |
Pinout & Package
MXD1812UR41+T is housed in a 3-pin SOT23 package (outline U3-1), measuring 2.92mm × 1.3mm × 1.0mm, with gull-wing leads optimized for reflow soldering and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during reset condition; no external pullup required |
| 2 | VCC | Power supply input and reset threshold reference - monitors system voltage directly |
| 3 | GND | Ground reference - forms return path for internal comparator and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.12V threshold | Factory-trimmed ±2.5% accuracy over full temperature range eliminates calibration overhead |
| 100ms fixed reset timeout | Internally timed - removes need for external RC network and associated layout sensitivity |
| Push-pull active-high RESET | Directly interfaces with μP reset pins requiring high-active assertion without pullup resistor |
| 4μA ultra-low supply current | Enables use in always-on battery-backed subsystems without measurable drain impact |
| VCC = +1V reset validity | Ensures deterministic reset state during deep brownout - avoids metastability in downstream logic |
| Transient immunity | Rejects fast VCC glitches ≤1.5μs (at 4.12V threshold) - prevents spurious resets in noisy environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power-up sequencing and brownout recovery in DIN-rail mounted programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-high signal to ARM Cortex-M7 MCU during VCC ramp and undervoltage events. Use Value: Guarantees clean boot and safe shutdown by holding reset until stable 5V rail is confirmed, preventing firmware corruption during line transients. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring long operational life and fail-safe startup under variable battery discharge profiles. IC Role / Device Role / Timing Role: Primary voltage supervisor monitoring main 5V LDO output, triggering reset if battery drops below 4.12V threshold. Use Value: 4μA quiescent current extends single-cell Li-ion runtime by >12 months in standby; 100ms timeout ensures full ADC and display initialization. |
| Set-Top Box Power Management | Network Edge Router Control Plane |
Use Scenario: Consumer set-top boxes with dual-rail power (5V/3.3V) where 5V rail powers SoC core logic and must be validated before boot. IC Role / Device Role / Timing Role: Dedicated 5V supervisor feeding reset to media processor's active-high reset pin during cold start and AC dropout. Use Value: Factory-set 4.12V threshold matches 5V rail tolerance; push-pull drive eliminates pullup resistor, saving board area and BOM cost. |
Use Scenario: Carrier-grade edge routers with redundant 5V power supplies where control-plane CPU must reset synchronously on any supply fault. IC Role / Device Role / Timing Role: Reset monitor on primary 5V distribution rail, asserting active-high reset to PowerPC-based management controller. Use Value: Guaranteed operation down to VCC = +1V ensures reset remains valid during cascaded supply failures; SOT23-3 footprint supports high-density routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 4.00V threshold (±2.5%), same SOT23-3 package, 14μA ICC, active-low open-drain output | Requires external pullup; not suitable for direct replacement where active-high push-pull is required | Select only if system design accommodates active-low reset and can add 4.7kΩ pullup |
| TPS3808G33DBVR | 3.3V threshold, 350ms timeout, 1.8μA ICC, active-low push-pull, wider VCC range (0.8–6V) | Lower threshold and longer timeout - mismatched for 5V systems needing 4.12V detection | Use only in new designs targeting 3.3V rails; not drop-in for MXD1812UR41+T's 5V/4.12V role |
Compared with MAX809TRD2+T and TPS3808G33DBVR, the MXD1812UR41+T uniquely combines 4.12V precision threshold, active-high push-pull output, and 4μA supply current in SOT23-3 - making it optimal for legacy and new 5V microprocessor systems demanding minimal component count and deterministic reset timing.
Availability
MXD1812UR41+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, set-top box power management, and network edge router control plane applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MXD1812UR41+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 semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MXD1810–MXD1818 family was designed specifically for low-power, high-accuracy microprocessor reset supervision in space-constrained embedded systems - emphasizing factory-trimmed thresholds, ultra-low ICC, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MXD1812UR41+T?
The MXD1812UR41+T has a factory-set reset threshold of 4.12V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R41" entry and applies specifically to the MXD1812UR41+T variant within the MXD1810–MXD1818 family.
Does the MXD1812UR41+T support manual reset functionality?
No, the MXD1812UR41+T does not include manual reset detection. That feature is exclusive to the MXD1813/MXD1818 variants (e.g., MXD1813UR41+T), which incorporate debounced push-button detect circuitry requiring ≥1.5μs low pulse on the RESET pin. The MXD1812UR41+T provides only power-supply monitoring and automatic reset assertion.
What is the output configuration of the MXD1812UR41+T RESET pin?
The MXD1812UR41+T features an active-high push-pull RESET output. When reset is asserted (VCC < 4.12V), the pin drives high; when deasserted (VCC > 4.12V and timeout complete), it drives low. This eliminates the need for an external pullup resistor and directly interfaces with microprocessors requiring high-active reset signals.
Can the MXD1812UR41+T operate reliably at VCC = +1.2V?
Yes - the MXD1812UR41+T is guaranteed to maintain valid RESET output logic states down to VCC = +1.2V (minimum specified operating voltage), and its reset comparator remains functional down to VCC = +1.0V. This ensures deterministic behavior during deep brownout conditions where other supervisors may fail.
Is the MXD1812UR41+T pin-compatible with other devices in the same family?
Yes, the MXD1812UR41+T uses the standard 3-pin SOT23-3 package (U3-1 outline) and shares identical pinout (RESET/VCC/GND) with all MXD1810–MXD1818 variants in SOT23 format, including MXD1810UR41+T and MXD1813UR41+T. This allows flexible selection based on threshold and output type without PCB redesign.
MXD1812UR41+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.12V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MXD1812UR41+T FAQ
1.How can I place an order for MXD1812UR41+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812UR41+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 MXD1812UR41+T reliable?
The price and inventory of MXD1812UR41+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812UR41+T is usually 5 days.
3.What payment methods are accepted for MXD1812UR41+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812UR41+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812UR41+T?
MXD1812UR41+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812UR41+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 MXD1812UR41+T?
For technical support, including MXD1812UR41+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812UR41+T requirements.
6.How does Aetrix verify that MXD1812UR41+T is sourced from the original manufacturer or authorized distributors?
All MXD1812UR41+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 MXD1812UR41+T meets industry standards.
7.What is the process for return or replacement of MXD1812UR41+T?
All MXD1812UR41+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812UR41+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 MXD1812UR41+T part is unused and in its original packaging.
Return procedure for MXD1812UR41+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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