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Analog Devices Inc./Maxim Integrated MXD1812UR46
- Part No.:
- MXD1812UR46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1812UR46.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:709
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Product details
Overview
MXD1812UR46 from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT23-3 package, featuring active-high push-pull RESET output, 4.62V factory-set reset threshold, 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 brownout or power-up.
For engineers reviewing the MXD1812UR46 datasheet, MXD1812UR46 pinout, MXD1812UR46 application, or MXD1812UR46 equivalent, key selection criteria include reset threshold accuracy (±2.5%), manual-reset compatibility (not supported), supply current (4µA typ), and guaranteed logic validity at VCC ≥ 1V.
Technical Context
The MXD1812UR46 implements a precision voltage comparator with hysteresis-free threshold detection at 4.62V (±2.5% over temperature), coupled to a fixed 100ms internal timer that holds RESET high after VCC recovers above threshold. Its push-pull output drives directly into CMOS inputs without external pullup.
No manual-reset input is implemented - unlike MXD1813/MXD1818 variants - and no debouncing circuitry is present. The device ignores fast transients on VCC via internal filtering, ensuring immunity to sub-10µs negative glitches when VCC overdrive exceeds 100mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.62V ±2.5% - ensures reliable reset assertion for +5V systems experiencing brownout below 4.50V |
| Reset Timeout | 100ms min - guarantees sufficient hold time for µP initialization before release |
| Supply Current | 4µA typ at +3.6V - enables multi-year battery life in portable equipment |
| Operating Voltage | +1.0V to +5.5V - supports valid RESET output even during deep brownout |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface |
| Temperature Range | -40°C to +105°C - qualified for industrial and automotive under-hood environments |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
Pinout & Package
MXD1812UR46 is housed in a 3-pin SOT23 package (outline U3-1), with 0.95mm pitch, 1.3mm width, and 2.92mm length. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC (supply and monitor input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - asserts high during reset condition; sinks/source up to 10mA/350µA |
| 2 | VCC | Power supply input and reset-threshold reference - monitors system rail directly without external components |
| 3 | GND | Ground reference - provides return path for internal comparator and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.62V threshold | Factory-trimmed ±2.5% accuracy over -40°C to +105°C ensures consistent brownout response in +5V systems |
| 100ms fixed timeout | Guaranteed minimum delay prevents premature µP release before stable clock and supply conditions are achieved |
| Push-pull active-high output | Direct drive capability eliminates external pullup, reduces BOM count, and improves noise immunity vs open-drain alternatives |
| Low 4µA supply current | Enables use in always-on battery-backed monitoring circuits without significant drain impact |
| VCC = +1V operation | Valid RESET output maintained down to 1V supply - critical for detecting final stages of power collapse |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 5V power rails in PLC I/O modules subject to intermittent mains dropouts and EMI-induced transients. IC Role / Device Role / Timing Role: Supervisor IC asserting active-high RESET to halt processor execution until VCC stabilizes above 4.62V and remains valid for ≥100ms. Use Value: Prevents firmware corruption and spurious actuator commands during brownout recovery by enforcing deterministic reset timing. | Use Scenario: Power supervision in handheld glucose meters powered by single-cell Li-ion batteries operating near end-of-discharge. IC Role / Device Role / Timing Role: Reset generator maintaining valid active-high RESET signal down to VCC = +1V to ensure safe shutdown before memory retention loss. Use Value: Guarantees data integrity during battery depletion by extending functional reset window beyond typical µP operational limits. |
| Set-Top Box Power Management | Network Router Baseboard |
Use Scenario: Supervising 5V standby and main rails in consumer STBs where rapid power cycling and thermal stress cause voltage sags. IC Role / Device Role / Timing Role: Voltage monitor triggering active-high RESET on VCC dip below 4.62V, holding for 100ms minimum after recovery. Use Value: Eliminates boot-loop failures caused by marginal 5V rail stability during cold start or ambient temperature shifts. | Use Scenario: Ensuring clean boot sequence in multi-rail networking hardware where 5V auxiliary supply powers management MCU independently. IC Role / Device Role / Timing Role: Dedicated reset supervisor for management controller, decoupled from main SoC reset chain and immune to transient coupling. Use Value: Isolates management subsystem reliability from primary power domain noise, enabling remote diagnostics even during main CPU faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR46D | Same 4.62V threshold, active-low open-drain output, 14µA max ICC, SC70-3 only | Requires external pullup; not pin-compatible due to active-low polarity and different pinout | Select when open-drain interface or SC70 footprint is required; verify µP reset pin polarity compatibility |
| TPS3808G33DBVR | 3.3V threshold (not 4.62V), adjustable delay, 1.8µA ICC, SOT23-5 package | Higher pin count, different threshold - unsuitable for +5V brownout detection without redesign | Choose only if system uses 3.3V supply and requires programmable timeout; not a functional substitute for MXD1812UR46 |
Compared with MAX809TR46D and TPS3808G33DBVR, MXD1812UR46 uniquely delivers active-high push-pull output at 4.62V in SOT23-3, enabling direct replacement of legacy DS1812-style supervisors without layout changes or polarity inversion.
Availability
MXD1812UR46 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, set-top boxes, and network router baseboards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1812UR46 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, computing, and communications markets, with emphasis on power management and supervisory functions.
The MXD1810–MXD1818 family was developed specifically for cost-sensitive, space-constrained microprocessor reset applications in battery-powered and industrial equipment, prioritizing ultra-low quiescent current and guaranteed operation down to 1V.
FAQ
What is the reset threshold voltage of MXD1812UR46 and how accurate is it over temperature?
The MXD1812UR46 has a factory-set reset threshold of 4.62V with ±2.5% accuracy over the full operating temperature range of -40°C to +105°C. This specification ensures reliable detection of brownout conditions in +5V systems, even under extreme thermal stress. The MXD1812UR46 maintains this tolerance without requiring calibration or external components.
Does MXD1812UR46 support manual reset functionality via an external pushbutton?
No, MXD1812UR46 does not include manual reset detection circuitry. That feature is exclusive to the MXD1813 and MXD1818 variants. The MXD1812UR46 provides only power-supply monitoring and automatic reset assertion - any external reset initiation must be handled by separate logic or a different device variant.
What is the output configuration of MXD1812UR46 and how does it interface with a microprocessor?
MXD1812UR46 features an active-high push-pull RESET output, meaning it actively drives high during reset and low otherwise. This eliminates the need for an external pullup resistor and allows direct connection to standard CMOS reset inputs. The output can source 350µA and sink 10mA, making MXD1812UR46 compatible with most µP reset pins without level-shifting or buffering.
Can MXD1812UR46 operate reliably when the supply voltage drops below 2V?
Yes, MXD1812UR46 is guaranteed to maintain valid logic states on its RESET output down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This capability ensures fail-safe behavior during deep brownout events, allowing controlled shutdown before memory or register corruption occurs - a key design advantage of the MXD1812UR46 in battery-critical applications.
Is MXD1812UR46 pin-compatible with older Maxim reset ICs like DS1812?
Yes, MXD1812UR46 is explicitly stated as pin-compatible with DS181x-series products in SOT23 packages. The pinout (RESET-VCC-GND), footprint, and electrical interface match, enabling drop-in replacement in existing designs. However, designers must confirm that the active-high output polarity of MXD1812UR46 aligns with their µP's reset input requirements, as some legacy parts use active-low signaling.
MXD1812UR46 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.62V
- 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
MXD1812UR46 FAQ
1.How can I place an order for MXD1812UR46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812UR46 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 MXD1812UR46 reliable?
The price and inventory of MXD1812UR46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812UR46 is usually 5 days.
3.What payment methods are accepted for MXD1812UR46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812UR46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812UR46?
MXD1812UR46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812UR46 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 MXD1812UR46?
For technical support, including MXD1812UR46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812UR46 requirements.
6.How does Aetrix verify that MXD1812UR46 is sourced from the original manufacturer or authorized distributors?
All MXD1812UR46 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 MXD1812UR46 meets industry standards.
7.What is the process for return or replacement of MXD1812UR46?
All MXD1812UR46 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812UR46, 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 MXD1812UR46 part is unused and in its original packaging.
Return procedure for MXD1812UR46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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