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Analog Devices Inc./Maxim Integrated MXD1812UR46+T
- Part No.:
- MXD1812UR46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1812UR46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:958
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Product details
Overview
MXD1812UR46+T from Maxim Integrated is a low-power microprocessor reset supervisor IC designed for +5V systems, featuring an 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 supply voltage integrity in embedded controllers and portable equipment to prevent erroneous code execution during power-up, brownout, or power-down events.
For engineers reviewing the MXD1812UR46+T datasheet, MXD1812UR46+T pinout, MXD1812UR46+T application, or MXD1812UR46+T equivalent, key selection criteria include reset polarity (active-high), push-pull drive capability, guaranteed VCC = +1V logic validity, transient immunity, and SOT23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The MXD1812UR46+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 4.62V, triggering an active-high RESET assertion. Its internal timer ensures RESET remains high for ≥100ms after VCC recovers above threshold, independent of VCC slew rate.
Unlike open-drain variants, this device uses push-pull output architecture-no external pullup required-and guarantees valid logic levels (RESET = high) even as VCC declines to +1V, enabling robust reset signaling in deep brownout conditions without auxiliary biasing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.62V ±2.5% over -40°C to +105°C - ensures reliable detection of +5V supply collapse before system instability |
| Reset Timeout | 100ms (min) - provides sufficient hold time for μP initialization across all operating temperatures |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable instrumentation |
| VCC Operating Range | +1.0V to +5.5V - supports valid reset assertion even during severe brownout or partial power loss |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to μP reset inputs |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB assembly |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1812UR46+T is housed in a 3-pin SOT23 package (U3-1 outline), with 0.95mm pitch, 1.3mm width, and 2.92mm length. The package is RoHS-compliant and lead(Pb)-free, marked "FZKH" per Maxim's top-marking table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during reset condition; sinks current when low; no external pullup needed |
| 2 | VCC | Power supply input and reset threshold reference - monitors system +5V rail directly; operates down to +1V |
| 3 | GND | Ground reference - common return path for internal comparator and output stage; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.62V with ±2.5% accuracy over full temperature range - eliminates calibration overhead and external resistive dividers |
| Push-pull active-high RESET | Direct interface to μP reset pins requiring high-active assertion - removes dependency on external pullup networks |
| Guaranteed logic validity to VCC = +1V | Ensures RESET remains asserted (high) even during deep brownout - prevents premature release before power recovery |
| Transient immunity | Rejects fast negative-going VCC glitches up to 100µs duration (at 100mV overdrive) - avoids spurious resets in noisy environments |
| Ultra-low quiescent current | 4μA typical - reduces standby power in always-on monitoring circuits and extends battery runtime |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring +5V power rails in programmable logic controllers (PLCs) deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M7 microcontrollers during undervoltage events, ensuring deterministic boot sequence restart. Use Value: Prevents firmware corruption by holding reset until stable +5V is restored and maintained for ≥100ms, meeting IEC 61000-4-11 immunity requirements. | Use Scenario: Power supervision in handheld ECG monitors powered by single-cell Li-ion batteries with buck-boost regulation to +5V. IC Role / Device Role / Timing Role: Reset generator maintaining valid active-high RESET signal down to VCC = +1V, enabling safe shutdown and recovery when battery voltage sags near end-of-life. Use Value: Eliminates need for external pullup or level-shifting circuitry, reducing BOM count and PCB area while preserving reset reliability across full battery discharge curve. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Ensuring clean boot of MIPS-based network processors in carrier-grade edge routers exposed to AC line transients. IC Role / Device Role / Timing Role: Voltage monitor detecting +5V rail collapse due to EFT bursts or lightning-induced surges, initiating controlled processor reset via push-pull output. Use Value: Push-pull drive delivers fast rise/fall times (<5µs) and strong noise margin, preventing metastability in high-speed reset paths critical for telecom timing compliance. | Use Scenario: Supervising auxiliary +5V supply in DIN-rail mounted electricity meters operating continuously in unconditioned utility cabinets (-40°C to +85°C). IC Role / Device Role / Timing Role: Brownout detector asserting RESET during grid voltage sags, synchronized with metering SoC's power management unit to preserve flash memory integrity. Use Value: 100ms fixed timeout aligns with IEC 62056-21 reset timing requirements, while ±2.5% threshold tolerance ensures consistent trip point across production lots and temperature extremes. |
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 | Active-low open-drain output; 4.63V threshold; requires external pullup; 14μA supply current | Compatible with bidirectional μP reset pins but adds layout complexity and higher static power | Select only if legacy design mandates active-low or open-drain topology |
| TPS3808G33DBVR | Active-low push-pull; 3.08V threshold; adjustable timeout; 12μA supply current; wider VCC range (up to 6.5V) | Designed for 3.3V systems; not drop-in for +5V monitoring; requires timeout configuration | Choose only for new 3.3V designs needing programmable delay or higher VCC tolerance |
Compared with MAX809TRD3+T and TPS3808G33DBVR, MXD1812UR46+T offers lower quiescent current (4μA vs. ≥12μA), guaranteed +1V operation, and true active-high push-pull output-enabling simpler, more power-efficient +5V reset supervision without external components or timing configuration.
Availability
MXD1812UR46+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, network edge routers, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1812UR46+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 MXD181x family was designed specifically for low-power, high-accuracy microprocessor reset supervision in space-constrained +5V and +3.3V systems, emphasizing factory-trimmed thresholds, minimal external components, and extended temperature operation.
FAQ
What is the reset threshold voltage of MXD1812UR46+T and how accurate is it over temperature?
The MXD1812UR46+T has a factory-set reset threshold of 4.62V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +105°C. This specification is validated by design and production-tested at +25°C, with limits over temperature ensured by characterization. The threshold remains stable against fast VCC transients, supporting reliable operation in electrically noisy environments where the MXD1812UR46+T is deployed.
Does MXD1812UR46+T require an external pullup resistor on its RESET pin?
No, MXD1812UR46+T does not require an external pullup resistor because it features an active-high push-pull RESET output. The internal output stage actively drives high during reset assertion and low otherwise, eliminating reliance on external biasing. This simplifies PCB layout, reduces component count, and improves noise immunity compared to open-drain alternatives-making MXD1812UR46+T ideal for compact, low-power designs where board space and BOM cost matter.
Can MXD1812UR46+T operate reliably when VCC drops below 2.0V?
Yes, MXD1812UR46+T 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 the MXD1812UR46+T continues asserting active-high RESET during deep brownout conditions-critical for preventing premature microprocessor release before stable power is restored. Operation below +1.0V is not specified and may result in undefined behavior.
What is the minimum reset timeout period for MXD1812UR46+T and is it adjustable?
The MXD1812UR46+T provides a fixed minimum reset timeout period of 100ms after VCC rises above the 4.62V threshold, with typical values up to 150ms and maximum 250ms. This timeout is internally generated and non-adjustable-designed to meet standard microprocessor initialization requirements without external timing components. The fixed duration ensures consistent, predictable reset hold time across all units and operating conditions, simplifying system-level timing validation for MXD1812UR46+T implementations.
Which package type and marking code correspond to MXD1812UR46+T?
MXD1812UR46+T is supplied in a 3-pin SOT23 package (outline U3-1), with top-side marking "FZKH" as specified in Maxim's Device Marking Codes table. The "U" in the part number denotes SOT23 packaging, "R46" indicates the 4.62V reset threshold, and "+T" confirms lead(Pb)-free, RoHS-compliant construction. This package is optimized for automated pick-and-place assembly and thermal performance in high-density layouts where MXD1812UR46+T is used.
MXD1812UR46+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:
- 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+T FAQ
1.How can I place an order for MXD1812UR46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812UR46+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 MXD1812UR46+T reliable?
The price and inventory of MXD1812UR46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812UR46+T is usually 5 days.
3.What payment methods are accepted for MXD1812UR46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812UR46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812UR46+T?
MXD1812UR46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812UR46+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 MXD1812UR46+T?
For technical support, including MXD1812UR46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812UR46+T requirements.
6.How does Aetrix verify that MXD1812UR46+T is sourced from the original manufacturer or authorized distributors?
All MXD1812UR46+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 MXD1812UR46+T meets industry standards.
7.What is the process for return or replacement of MXD1812UR46+T?
All MXD1812UR46+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812UR46+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 MXD1812UR46+T part is unused and in its original packaging.
Return procedure for MXD1812UR46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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