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Analog Devices Inc./Maxim Integrated MXD1812XR46+
- Part No.:
- MXD1812XR46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MXD1812XR46+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
MXD1812XR46+ from Maxim Integrated is a low-power microprocessor reset supervisor IC with active-high push-pull RESET output, factory-set 4.62V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors +5V power supplies in embedded controllers and portable systems, asserting reset during brownout and ensuring reliable μP initialization.
For engineers reviewing the MXD1812XR46+ datasheet, MXD1812XR46+ pinout, MXD1812XR46+ application, or MXD1812XR46+ equivalent, key selection criteria include its active-high push-pull output configuration, SC70-3 package, guaranteed reset validity at low VCC, transient immunity, and compatibility with manual-reset-free designs requiring deterministic high-level reset assertion.
Technical Context
The MXD1812XR46+ integrates a precision voltage comparator with hysteresis, internal timing capacitor, and push-pull output driver - all in a single 3-pin SC70 package. Its reset threshold is factory-trimmed to 4.62V (min 4.50V, max 4.75V) and maintains ±2.5% accuracy across –40°C to +105°C.
It asserts RESET high when VCC falls below the threshold and holds it high for ≥100ms after VCC rises above threshold. Unlike MXD1813/MXD1818, it lacks manual-reset debounce circuitry and open-drain capability - confirming its role as a dedicated active-high, no-button, fixed-threshold supervisory device for stable +5V rail monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.62V (factory-set, 4.50V–4.75V range); ensures reset triggers only when +5V supply drops below safe operating level. |
| Reset Timeout Period | 100ms minimum (100–250ms typical); guarantees μP remains held in reset long enough for full power stabilization. |
| Supply Current | 4μA typical at +3.6V; enables use in battery-powered equipment with multi-year standby life. |
| Operating Voltage Range | +1.0V to +5.5V; allows valid RESET output assertion even during deep brownout conditions down to 1V. |
| Output Type | Active-high push-pull; drives RESET high without external pullup, simplifying interface with μP reset inputs expecting active-high assertion. |
| Temperature Range | –40°C to +105°C; qualified for industrial and extended-temperature embedded applications. |
| Package | 3-pin SC70 (X3-2 outline); 1.25mm × 0.85mm footprint ideal for space-constrained portable PCBs. |
Pinout & Package
MXD1812XR46+ uses a 3-pin SC70 package (outline X3-2, land pattern 90-0208). Pin 1 is RESET (active-high push-pull output), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND. No external components are required for basic reset supervision.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; transitions high on VCC undervoltage and stays high ≥100ms after VCC recovery. |
| 2 | VCC | Power supply input and reset threshold reference; monitored continuously for drop below 4.62V. |
| 3 | GND | Ground reference for comparator, timer, and output driver; must be low-impedance for accurate threshold detection. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.62V threshold | Eliminates external resistor divider; reduces BOM count and layout area while guaranteeing precision across temperature. |
| Active-high push-pull output | Drives RESET high directly - no pullup resistor needed - reducing component count and eliminating weak-drive uncertainty of open-drain alternatives. |
| 100ms fixed reset timeout | Ensures μP reset duration exceeds worst-case power-rail settling time without requiring external RC timing network. |
| 4μA supply current | Enables integration into always-on subsystems (e.g., RTC supervisors, wake-up monitors) without measurable battery drain. |
| VCC = +1V reset validity | Guarantees RESET remains asserted until supply collapses fully - critical for preventing partial-execution faults in low-VCC failure modes. |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
|
Use Scenario: PLC I/O modules powered from regulated +5V rails subject to intermittent brownouts during field deployment. IC Role / Device Role / Timing Role: Supervises +5V supply and asserts active-high RESET to ARM Cortex-M4 microcontroller during undervoltage events. Use Value: Prevents corrupted firmware execution by holding μP in known state until rail stabilizes ≥100ms post-recovery - validated across –40°C to +105°C. |
Use Scenario: Handheld glucose meters using coin-cell batteries where supply voltage decays gradually from 3.3V to 1.8V during discharge. IC Role / Device Role / Timing Role: Monitors declining +5V-derived rail (via boost converter) and triggers active-high reset before logic voltage violates μC spec. Use Value: Enables graceful shutdown sequence initiation at precisely 4.62V threshold, extending usable battery life while avoiding erratic behavior. |
| Network Edge Routers | Smart Energy Meters |
|
Use Scenario: Fanless edge routers with thermally throttled DC-DC converters causing momentary +5V dips under load bursts. IC Role / Device Role / Timing Role: Detects sub-4.62V excursions and asserts RESET high to MIPS-based SoC, blocking boot until rail recovers. Use Value: Immunity to fast transients (<5µs) prevents spurious resets; 4μA quiescent current minimizes impact on system efficiency. |
Use Scenario: DIN-rail mounted electricity meters exposed to wide ambient temperatures and grid-induced supply sags. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision for dual-core metering SoC, asserting active-high RESET during AC/DC converter brownouts. Use Value: Guaranteed operation from –40°C to +105°C and reset validity down to VCC = +1V ensure reliability in uncontrolled outdoor enclosures. |
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 | 4.63V threshold, SOT23-3, active-low open-drain output; requires external pullup; 1.6μA ICC. | Requires pullup resistor and μP with active-low reset input; lower current but incompatible output polarity and drive type. | Select only if system design already uses active-low reset architecture and board layout accommodates pullup. |
| TPS3808G33DBVR | 3.3V threshold, SOT23-6, adjustable delay, active-low push-pull; 12μA ICC; supports enable input. | Fixed 3.3V threshold - unsuitable for +5V monitoring; extra pins increase footprint and require additional control logic. | Not a functional substitute for MXD1812XR46+ due to mismatched threshold and incompatible voltage domain. |
Compared with MAX809TRD3+T and TPS3808G33DBVR, MXD1812XR46+ uniquely delivers factory-trimmed 4.62V detection with active-high push-pull output in SC70 - enabling direct replacement of legacy DS1812-style supervisors without layout or firmware changes.
Availability
MXD1812XR46+ is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1812XR46+ 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 applications, emphasizing reliability, low power, and small form factor.
The MXD1810–MXD1818 family was engineered specifically for cost-sensitive, space-constrained microprocessor reset supervision - delivering factory-set thresholds, minimal external components, and robust transient immunity in 3-pin SC70/SOT23 packages.
FAQ
What is the reset threshold voltage of the MXD1812XR46+?
The MXD1812XR46+ has a factory-set reset threshold of 4.62V, with a guaranteed range of 4.50V to 4.75V over temperature (–40°C to +105°C) and ±2.5% accuracy. This precise threshold ensures reliable detection of +5V supply brownout conditions without false triggering during normal operation or fast transients.
Does the MXD1812XR46+ support manual reset functionality?
No, the MXD1812XR46+ does not include manual reset or push-button debounce circuitry. That feature is exclusive to the MXD1813/MXD1818 variants. The MXD1812XR46+ provides only power-supply monitoring and automatic reset assertion - making it ideal for applications where external reset initiation is unnecessary or handled separately.
What is the output configuration of the MXD1812XR46+?
The MXD1812XR46+ features an active-high push-pull RESET output. When VCC drops below 4.62V, RESET transitions high and remains high for at least 100ms after VCC recovers above threshold. This eliminates the need for an external pullup resistor and simplifies interfacing with microprocessors that accept active-high reset signals.
Can the MXD1812XR46+ operate with supply voltages below 2.5V?
Yes - the MXD1812XR46+ is guaranteed to assert a valid RESET signal down to VCC = +1.0V, and operates across a full supply range of +1.0V to +5.5V. This ensures deterministic reset behavior even during deep brownout or battery-depletion scenarios, unlike many competitors that lose output validity below 1.8V.
What package type is used for the MXD1812XR46+?
The MXD1812XR46+ is supplied in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 1.25mm × 0.85mm with 0.65mm pitch. This ultra-compact RoHS-compliant package supports high-density PCB layouts in portable and space-constrained embedded systems.
MXD1812XR46+ 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:
- -
MXD1812XR46+ FAQ
1.How can I place an order for MXD1812XR46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812XR46+ 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 MXD1812XR46+ reliable?
The price and inventory of MXD1812XR46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812XR46+ is usually 5 days.
3.What payment methods are accepted for MXD1812XR46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812XR46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812XR46+?
MXD1812XR46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812XR46+ 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 MXD1812XR46+?
For technical support, including MXD1812XR46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812XR46+ requirements.
6.How does Aetrix verify that MXD1812XR46+ is sourced from the original manufacturer or authorized distributors?
All MXD1812XR46+ 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 MXD1812XR46+ meets industry standards.
7.What is the process for return or replacement of MXD1812XR46+?
All MXD1812XR46+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812XR46+, 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 MXD1812XR46+ part is unused and in its original packaging.
Return procedure for MXD1812XR46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1812XR46+ Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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EM Microelectronic
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MCP120T-300I/TT
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MCP130T-315I/TT
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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