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Analog Devices Inc./Maxim Integrated MXD1818UR31+T
- Part No.:
- MXD1818UR31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR31+T.pdf
- Description:
- IC MPU RESET CIRC 3.06V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,441
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Product details
Overview
MXD1818UR31+T from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT23-3 package, designed for +2.5V/+3.0V/+3.3V systems with factory-set 3.06V reset threshold, 100ms minimum reset timeout, and debounced manual-reset capability. It monitors VCC and asserts active-low open-drain RESET when supply drops below threshold or when external pushbutton pulls RESET low for ≥1.5μs - used in portable battery-powered controllers and set-top boxes.
For engineers reviewing the MXD1818UR31+T datasheet, MXD1818UR31+T pinout, MXD1818UR31+T application, or MXD1818UR31+T equivalent, key selection criteria include its 3.06V ±2.5% threshold accuracy over –40°C to +105°C, internal 5.5kΩ pullup resistor, guaranteed RESET validity down to VCC = +1V, and compatibility with bidirectional μP reset pins without external components.
Technical Context
The MXD1818UR31+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC brownout conditions and reject fast transients up to 100μs (at 100mV overdrive). Its internal timer ensures reset remains asserted for ≥100ms after VCC recovers above 3.06V.
It features dedicated manual-reset detection logic that triggers on RESET pin low pulses ≥1.5μs, followed by a separate 100ms minimum timeout (tPBRST), with integrated debouncing to suppress mechanical switch bounce - distinct from power-fail reset timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06V ±2.5% over –40°C to +105°C - ensures reliable brownout detection for 3.3V systems with margin |
| Reset Timeout Period | 100ms minimum (tRP and tPBRST) - guarantees sufficient μP initialization time after power recovery or manual reset |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in coin-cell–powered portable devices |
| Operating Voltage Range | +1.0V to +5.5V - supports valid RESET assertion even during deep brownout down to 1V |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup - interfaces directly with bidirectional μP reset pins (e.g., 68HC11) without external resistor |
| Manual Reset Detect | Triggered by RESET pin low ≥1.5μs - enables robust pushbutton reset with hardware debouncing, no firmware dependency |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
Pinout & Package
MXD1818UR31+T is housed in a 3-pin SOT23 package (U3-1 outline, land pattern 90-0179), with exposed pad not electrically connected. Pin 1 is RESET (open-drain active-low), Pin 2 is VCC (supply and threshold monitor input), Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low output with internal 5.5kΩ pullup to VCC - sinks current during reset assertion; compatible with bidirectional μP reset pins |
| 2 | VCC | Supply input and reset-threshold monitoring node - powers internal circuitry and sets comparator reference |
| 3 | GND | Analog and digital ground reference - must be low-impedance connection to avoid false resets from noise |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.06V threshold | ±2.5% accuracy across –40°C to +105°C eliminates calibration overhead in 3.3V embedded designs |
| Debounced manual-reset input | Detects ≥1.5μs low pulse on RESET pin and initiates 100ms reset timeout - removes need for external RC debounce or firmware polling |
| Transient-immune comparator | Rejects VCC glitches ≤100μs (at 100mV overdrive) - prevents spurious resets in noisy industrial environments |
| No external components required | Integrates voltage reference, comparator, timer, pullup resistor, and debouncer - reduces BOM count and board area vs. discrete solutions |
| Valid RESET down to VCC = +1V | Ensures deterministic reset state during deep brownout - critical for data retention and safe shutdown in battery-backed systems |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered handheld ECG or glucose meter operating from single Li-ion cell with undervoltage risk during discharge. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to microcontroller when VCC falls below 3.06V, ensuring clean restart before data corruption occurs. Use Value: 4μA quiescent current extends battery life; 100ms timeout guarantees full μP boot sequence completion after voltage recovery. | Use Scenario: DIN-rail mounted I/O module exposed to 24V DC supply ripple and ESD events in factory automation. IC Role / Device Role / Timing Role: Power-supply monitor detecting brownout and rejecting fast transients to prevent unintended controller resets. Use Value: ±2.5% threshold accuracy and 100μs transient immunity ensure stable operation despite line noise; SOT23 package supports compact conformal-coated layout. |
| Set-Top Box Power Management | Smart Home Hub Controllers |
Use Scenario: Consumer STB with dual-rail power (3.3V core, 1.2V I/O) where 3.3V rail instability causes boot failures. IC Role / Device Role / Timing Role: Dedicated 3.3V rail supervisor generating synchronized RESET signal to SoC and peripheral ICs. Use Value: Open-drain output allows wired-OR with other reset sources; internal pullup avoids extra component in space-constrained chassis. | Use Scenario: Wi-Fi/BLE hub powered by USB or wall adapter, requiring reliable reset during hot-plug or low-voltage events. IC Role / Device Role / Timing Role: System-level reset generator triggered by either VCC drop or user-press of physical reset button. Use Value: Debounced manual-reset function eliminates contact bounce artifacts; 3.06V threshold matches typical 3.3V LDO dropout behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 3.08V reset threshold, 140ms timeout, no manual-reset detect, same SOT23-3 package | Lacks pushbutton debounce; requires external RC or firmware handling for manual reset | Choose when only power-fail reset is needed and board space permits optional external debounce |
| TPS3808G30DBVR | 3.0V threshold, 200ms timeout, adjustable delay via capacitor, higher 8μA ICC | Timeout programmable but adds external component; no integrated manual-reset logic | Select if longer reset hold time is required and design can accommodate timing capacitor |
Compared with MXD1818UR31+T, MAX809TRD3+T offers tighter threshold tolerance but omits manual-reset functionality, while TPS3808G30DBVR provides configurable timing at the cost of added BOM and higher quiescent current - MXD1818UR31+T uniquely integrates factory-trimmed 3.06V detection, 100ms fixed timeout, and hardware-debounced pushbutton support in a 3-pin SOT23.
Availability
MXD1818UR31+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, set-top box power management, and smart home hub controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1818UR31+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, space-constrained microprocessor supervision in battery-operated and thermally demanding systems - emphasizing precision threshold accuracy, transient immunity, and integrated manual-reset capability without external components.
FAQ
What is the exact reset threshold voltage of MXD1818UR31+T and how tightly is it specified?
The MXD1818UR31+T has a factory-set reset threshold of 3.06V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +105°C. This specification is confirmed in the Electrical Characteristics table under "MXD181_ _ R31" row, with min/typ/max values of 2.98V/3.06V/3.15V. The threshold is trimmed during production and does not require external adjustment.
Does MXD1818UR31+T support manual reset, and how does its debounce function work?
Yes, MXD1818UR31+T supports hardware-debounced manual reset via its RESET pin. When the RESET pin is pulled low for ≥1.5μs, the device asserts reset for a guaranteed minimum of 100ms (tPBRST). Internal circuitry filters mechanical switch bounce, eliminating the need for external RC networks or firmware polling - this behavior is exclusive to MXD1813/MXD1818 variants per the datasheet's Detailed Description section.
What is the output configuration of MXD1818UR31+T, and does it require an external pullup resistor?
MXD1818UR31+T features an open-drain, active-low RESET output with an internal 5.5kΩ pullup resistor to VCC. No external pullup is required - the internal resistor enables direct interfacing with bidirectional μP reset pins (e.g., Motorola 68HC11) and supports wired-OR reset bus configurations. This is explicitly documented in the Pin Descriptions and Applications Information sections.
Can MXD1818UR31+T operate reliably at very low supply voltages, and down to what VCC level is RESET guaranteed valid?
Yes, MXD1818UR31+T is guaranteed to assert and maintain a valid RESET signal down to VCC = +1.0V, as stated in both the General Description and Absolute Maximum Ratings sections. This ensures deterministic system behavior during deep brownout conditions - critical for data integrity in battery-backed applications. Operation below +1.0V is not characterized or guaranteed.
What package type and footprint does MXD1818UR31+T use, and is it RoHS-compliant?
MXD1818UR31+T uses the 3-pin SOT23 package (outline U3-1, land pattern 90-0179), measuring 2.92mm × 1.3mm. The "+T" suffix confirms lead(Pb)-free, RoHS-compliant packaging per Maxim's ordering conventions. The package drawing and land pattern are published on maximintegrated.com/packages, and the device is qualified for reflow soldering per JEDEC J-STD-020 standards.
MXD1818UR31+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:
- Active
- Programmable:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.06V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MXD1818UR31+T FAQ
1.How can I place an order for MXD1818UR31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR31+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 MXD1818UR31+T reliable?
The price and inventory of MXD1818UR31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR31+T is usually 5 days.
3.What payment methods are accepted for MXD1818UR31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR31+T?
MXD1818UR31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR31+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 MXD1818UR31+T?
For technical support, including MXD1818UR31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR31+T requirements.
6.How does Aetrix verify that MXD1818UR31+T is sourced from the original manufacturer or authorized distributors?
All MXD1818UR31+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 MXD1818UR31+T meets industry standards.
7.What is the process for return or replacement of MXD1818UR31+T?
All MXD1818UR31+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR31+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 MXD1818UR31+T part is unused and in its original packaging.
Return procedure for MXD1818UR31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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