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Analog Devices Inc./Maxim Integrated MXD1811UR41+T
- Part No.:
- MXD1811UR41+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MXD1811UR41+T.pdf
- Description:
- IC MPU RESET CIRC 4.12V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,645
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Product details
Overview
MXD1811UR41+T from Maxim Integrated is an open-drain, active-low microprocessor reset IC designed for +5V systems with factory-set 4.12V reset threshold, 100ms minimum reset timeout, ±2.5% threshold accuracy over temperature, and internal 5.5kΩ pullup resistor. It monitors VCC supply integrity in portable and industrial embedded controllers to prevent erroneous code execution during power-up, brownout, or transient events.
For engineers reviewing the MXD1811UR41+T datasheet, MXD1811UR41+T pinout, MXD1811UR41+T application, or MXD1811UR41+T equivalent, key selection criteria include its 4.12V threshold tolerance, 4μA quiescent current at 3.6V, guaranteed RESET validity down to VCC = +1V, and compatibility with bidirectional μP reset pins without external pullup components.
Technical Context
The MXD1811UR41+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 4.12V (±2.5% over −40°C to +105°C), triggering an open-drain active-low RESET signal. Its internal timer ensures reset remains asserted for ≥100ms after VCC recovers above threshold.
Unlike push-pull variants, this device uses open-drain output with integrated 5.5kΩ pullup to VCC, enabling direct interface with bidirectional microcontroller reset pins (e.g., Motorola 68HC11) and eliminating need for external pullup resistors. It provides immunity to fast VCC transients up to 10µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.12V (min 4.00V, max 4.24V); precise brownout detection for +5V systems |
| Reset Timeout Period | 100ms (min); ensures full μP initialization before release |
| Supply Current | 4μA at 3.6V; enables multi-year battery life in portable equipment |
| Operating Voltage Range | 1.2V to 5.5V; guarantees valid RESET output down to VCC = +1V |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup; supports wired-OR and bidirectional reset interfaces |
| Temperature Range | −40°C to +105°C; qualified for industrial and automotive under-hood environments |
| Threshold Accuracy | ±2.5% over full temperature range; eliminates need for field calibration |
Pinout & Package
MXD1811UR41+T is housed in a 3-pin SOT23 package (U3-1 outline), footprint-compatible with industry-standard SC70-3 but with larger pad spacing for improved manufacturability. The compact 2.92mm × 1.3mm body height of 1.0mm supports high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low output; sinks current when asserted; internal 5.5kΩ pullup to VCC enables direct connection to bidirectional μP reset pins |
| 2 | VCC | Supply input and reset-threshold monitor node; accepts 1.2V–5.5V; comparator ignores transients <10µs |
| 3 | GND | Ground reference for comparator and output stage; must be low-impedance return path for reliable reset timing |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, comparator, timer, and pullup eliminate discrete BOM items and layout area |
| Power-supply transient immunity | Rejects VCC glitches ≤10µs duration at 100mV overdrive, preventing false resets in noisy environments |
| Guaranteed RESET validity to VCC = +1V | Ensures deterministic reset state during deep brownout, critical for fail-safe system shutdown |
| Precision factory-trimmed threshold | 4.12V threshold with ±2.5% tolerance over −40°C to +105°C avoids manual trimming or calibration |
| Low-power operation | 4μA supply current at 3.6V enables use in always-on battery-backed monitoring circuits |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Monitoring 5V power rails in industrial PLCs and edge gateways during cold start and line sags. IC Role / Device Role / Timing Role: Active-low reset supervisor asserting RESET until VCC stabilizes above 4.12V for ≥100ms. Use Value: Prevents firmware lockup by ensuring CPU reset persists through slow-rising 5V supplies common in DIN-rail power modules. | Use Scenario: Power sequencing in handheld multimeters and oscilloscope front-ends with dual 3.3V/5V domains. IC Role / Device Role / Timing Role: Open-drain RESET output tied to shared reset bus with other peripherals. Use Value: Internal 5.5kΩ pullup eliminates external resistor, reducing component count while maintaining noise-immune reset assertion. |
| Set-Top Boxes | Portable/Battery-Powered Equipment |
Use Scenario: Ensuring clean boot sequence in cable/satellite receivers after AC power interruption. IC Role / Device Role / Timing Role: Brownout detector on main 5V rail with 100ms timeout aligned to SoC boot ROM requirements. Use Value: ±2.5% threshold accuracy over temperature prevents premature reset release during chassis heating in enclosed enclosures. | Use Scenario: Supervising coin-cell backup power in GPS trackers and asset tags operating at 2.5–5.5V. IC Role / Device Role / Timing Role: Low-quiescent-current (4μA) reset generator maintaining validity down to VCC = +1V. Use Value: Extends usable battery life by >30% versus higher-current supervisors while guaranteeing reset assertion during final discharge phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 4.0V reset threshold, 140ms timeout, 1.2μA ICC at 3.6V, same SOT23-3 package | Lacks internal pullup; requires external resistor for open-drain interface | Select when ultra-low current (<2μA) is prioritized over integrated pullup convenience |
| TPS3808G33DBVR | 3.3V threshold, adjustable timeout (200ms default), 1.5μA ICC, SOT23-6 package | Requires external capacitor for timeout setting; incompatible pinout and voltage range | Choose only if 3.3V-specific monitoring and programmable delay are required |
Compared with MXD1811UR41+T, MAX809TRD3+T offers lower quiescent current but demands external pullup circuitry, whereas TPS3808G33DBVR targets different voltage domains and adds design complexity via external timing components-neither provides the exact 4.12V threshold, integrated pullup, and drop-in SOT23-3 fit of MXD1811UR41+T.
Availability
MXD1811UR41+T is available at Aetrix Electronics and suitable for industrial controllers, intelligent instrumentation, set-top boxes, and portable/battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1811UR41+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 and mixed-signal ICs for industrial, communications, and consumer applications, emphasizing reliability, integration, and low-power operation.
The MXD1810–MXD1818 family was developed specifically to replace discrete reset solutions in space-constrained, battery-sensitive μP systems-delivering factory-trimmed thresholds, guaranteed timing, and zero-external-component operation in 3-pin SC70/SOT23 packages.
FAQ
What is the exact reset threshold voltage of MXD1811UR41+T and how tightly is it specified?
The MXD1811UR41+T has a factory-set reset threshold of 4.12V, with guaranteed minimum and maximum values of 4.00V and 4.24V respectively across −40°C to +105°C. This ±2.5% tolerance eliminates need for post-manufacture calibration and ensures consistent brownout response in 5V systems.
Does MXD1811UR41+T require an external pullup resistor on the RESET pin?
No, MXD1811UR41+T includes an internal 5.5kΩ pullup resistor to VCC, enabling direct connection to bidirectional microcontroller reset pins (e.g., Motorola 68HC11) without external components. This reduces BOM count and PCB area while maintaining noise-immune logic levels.
How long does the reset signal remain asserted after VCC rises above the threshold in MXD1811UR41+T?
The MXD1811UR41+T asserts RESET for a minimum of 100ms after VCC rises above the 4.12V threshold. Typical timeout is 150ms, with maximum of 250ms, ensuring sufficient hold time for microprocessors to complete power-on initialization sequences reliably.
Can MXD1811UR41+T operate with supply voltages below 2.5V?
Yes, MXD1811UR41+T operates from 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1V. However, its 4.12V threshold means it will assert reset continuously below that level-making it suitable for brownout detection in 5V systems, not low-voltage operation.
Is MXD1811UR41+T compatible with mechanical push-button manual reset functionality?
No, MXD1811UR41+T lacks debounced manual-reset capability. That feature is exclusive to MXD1813/MXD1818 variants. For push-button reset, select MXD1813UR41+T instead-MXD1811UR41+T is optimized for automatic power-supply monitoring only.
MXD1811UR41+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MXD1811UR41+T FAQ
1.How can I place an order for MXD1811UR41+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1811UR41+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 MXD1811UR41+T reliable?
The price and inventory of MXD1811UR41+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1811UR41+T is usually 5 days.
3.What payment methods are accepted for MXD1811UR41+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1811UR41+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1811UR41+T?
MXD1811UR41+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1811UR41+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 MXD1811UR41+T?
For technical support, including MXD1811UR41+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1811UR41+T requirements.
6.How does Aetrix verify that MXD1811UR41+T is sourced from the original manufacturer or authorized distributors?
All MXD1811UR41+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 MXD1811UR41+T meets industry standards.
7.What is the process for return or replacement of MXD1811UR41+T?
All MXD1811UR41+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1811UR41+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 MXD1811UR41+T part is unused and in its original packaging.
Return procedure for MXD1811UR41+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1811UR41+T Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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