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Analog Devices Inc./Maxim Integrated MXD1812UR44+T
- Part No.:
- MXD1812UR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1812UR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,916
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Product details
Overview
MXD1812UR44+T from Maxim Integrated is a low-power microprocessor reset IC in SOT23-3 package, featuring active-high push-pull RESET output, 4.37V factory-set reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1V. It monitors +5V power supplies in embedded controllers and portable systems to prevent code-execution errors during brownout or power-up.
For engineers reviewing the MXD1812UR44+T datasheet, MXD1812UR44+T pinout, MXD1812UR44+T application, or MXD1812UR44+T equivalent, key selection criteria include reset polarity (active-high), absence of manual-reset debounce (unlike MXD1813/MXD1818), compatibility with 5V systems, and space-constrained PCB layouts requiring 3-pin SOT23 footprint.
Technical Context
The MXD1812UR44+T implements a precision voltage comparator with hysteresis to detect VCC drops below 4.37V, triggering an active-high RESET signal. Its internal timer ensures reset remains asserted for ≥100ms after VCC recovers above threshold, independent of supply rise time.
No external components are required: the device integrates all sensing, timing, and output drive circuitry. It operates across -40°C to +105°C and consumes only 4μA typical supply current at 3.6V, making it suitable for battery-backed and thermally demanding applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% over -40°C to +105°C - ensures reliable detection of 5V supply brownout before μP malfunctions |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for full μP initialization after power recovery | Supply Current | 4μA typical at 3.6V - enables multi-year operation in coin-cell–powered backup circuits |
| Operating Voltage Range | +1.0V to +5.5V - supports valid RESET assertion even during deep brownout down to 1V |
| Output Type | Active-high push-pull - drives high without external pullup, simplifies interface to μP reset inputs requiring active-high assertion |
| 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 automotive under-hood environments |
Pinout & Package
MXD1812UR44+T is housed in a 3-pin SOT23 package (U3-1 outline) with 1.9mm pitch, RoHS-compliant lead-free finish (+T suffix), and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Power supply input and reset-threshold monitoring node - must be connected directly to monitored 5V rail |
| 2 | RESET | Active-high push-pull output - asserts high during reset condition; sinks current when low, sources current when high |
| 3 | GND | Analog and digital ground reference - requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.37V threshold | Eliminates need for external resistor dividers or calibration, reducing BOM count and layout area |
| Active-high push-pull RESET | Directly interfaces with μPs requiring active-high reset (e.g., certain ARM Cortex-M variants), avoiding level-shifting or inversion logic |
| 100ms fixed reset timeout | Guarantees μP reset pulse meets JEDEC JESD84-B51 minimum duration requirements without external RC timing |
| 4μA typical supply current | Enables use in always-on supervisory circuits without compromising battery life in portable equipment |
| VCC = +1V operation guarantee | Ensures deterministic reset behavior during deep undervoltage conditions where other supervisors may fail silently |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Monitoring 5V main supply in programmable logic controller I/O modules exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-high signal to ARM-based controller upon detected brownout. Use Value: Prevents spurious I/O state changes during transient dips by holding controller in reset until stable 5V is restored for ≥100ms. | Use Scenario: Power supervision in handheld ECG analyzers powered by rechargeable Li-ion batteries with 5V DC-DC output. IC Role / Device Role / Timing Role: Active-high reset source ensuring clean boot sequence after battery insertion or low-voltage recovery. Use Value: 4μA quiescent current extends standby runtime; 1V operational floor prevents false release during battery sag. |
| Point-of-Sale Terminals | Smart Energy Meters |
Use Scenario: Reset management in retail payment terminals with dual 5V rails (logic and display backlight). IC Role / Device Role / Timing Role: Dedicated supervisor for primary 5V logic rail, driving active-high reset to application processor. Use Value: Factory-set 4.37V threshold matches typical 5V rail tolerance (±5%), eliminating field tuning and improving production yield. | Use Scenario: Critical reset function in ANSI C12.20–compliant electricity meters operating in unconditioned outdoor enclosures. IC Role / Device Role / Timing Role: High-reliability reset generator maintaining operation from -40°C to +105°C ambient. Use Value: Guaranteed -40°C to +105°C specification ensures consistent reset timing across extreme seasonal temperature ranges. |
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 | Active-low open-drain output; 3.08V reset threshold; includes internal 50kΩ pullup | Requires external pullup for active-high logic; lower threshold suits 3.3V systems, not 5V brownout detection | Select only if system design accommodates active-low reset and targets 3.3V supply monitoring |
| TPS3808G33DBVR | Adjustable reset threshold via external resistor divider; 3.3V fixed option available; 200ms timeout | Higher pin count (5-pin SOT23); requires two external resistors; longer timeout may delay boot in latency-sensitive systems | Choose when adjustable threshold or tighter accuracy (±0.5%) is required, accepting added BOM and layout complexity |
Compared with MAX809TRD3+T and TPS3808G33DBVR, MXD1812UR44+T provides a compact, no-component-required solution optimized specifically for 5V systems needing active-high reset with precise 4.37V trip point and minimal footprint - ideal for cost- and space-constrained industrial and portable designs.
Availability
MXD1812UR44+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, point-of-sale terminals, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MXD1812UR44+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 computing applications, emphasizing reliability, low power, and small form factors.
The MXD1810–MXD1818 family was engineered to replace discrete reset solutions in space-constrained 5V and 3.3V microprocessor systems, delivering factory-trimmed accuracy and guaranteed timing without external components.
FAQ
What is the reset output polarity of MXD1812UR44+T?
MXD1812UR44+T features an active-high push-pull RESET output. When VCC drops below 4.37V, the RESET pin transitions from low to high and remains high for at least 100ms after VCC rises above the threshold. This eliminates the need for external pullup resistors and simplifies interfacing with microprocessors that require active-high reset assertion. The output is fully specified from -40°C to +105°C.
Does MXD1812UR44+T support manual reset functionality?
No, MXD1812UR44+T does not include manual reset or push-button debounce capability. That feature is exclusive to the MXD1813 and MXD1818 variants in the same family. MXD1812UR44+T provides only power-supply monitoring with automatic reset assertion on VCC drop. For designs requiring operator-initiated reset, MXD1813UR44+T or MXD1818UR44+T should be selected instead.
What is the minimum VCC voltage at which MXD1812UR44+T guarantees valid RESET output?
MXD1812UR44+T guarantees correct RESET logic state down to VCC = +1.0V. Below this voltage, output behavior is not specified. This ensures deterministic reset assertion during deep brownout conditions common in battery-powered systems where supply voltage may sag significantly before shutdown. The device remains functional and asserts RESET correctly throughout its entire 1.0V–5.5V operating range.
Can MXD1812UR44+T be used in 3.3V systems?
No, MXD1812UR44+T is factory-configured for 5V systems with a 4.37V reset threshold, which is inappropriate for 3.3V supply monitoring. Using it on a 3.3V rail would cause continuous reset assertion since 3.3V is well below the 4.37V threshold. For 3.3V applications, select MXD1815URxx+T or MXD1816URxx+T variants with thresholds such as 3.06V (R31), 2.88V (R29), or 2.55V (R26).
What package type and RoHS status does MXD1812UR44+T use?
MXD1812UR44+T uses the 3-pin SOT23 package (U3-1 outline) with lead-free, RoHS-compliant construction indicated by the "+T" suffix. It has a 1.9mm pin pitch, 2.92mm × 1.3mm body size, and moisture sensitivity level 1. The "+" in "+T" explicitly denotes lead-free packaging per JEDEC J-STD-020, and the device is supplied in tape-and-reel format with 2500 units per reel.
MXD1812UR44+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V
- 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
MXD1812UR44+T FAQ
1.How can I place an order for MXD1812UR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812UR44+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 MXD1812UR44+T reliable?
The price and inventory of MXD1812UR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812UR44+T is usually 5 days.
3.What payment methods are accepted for MXD1812UR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812UR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812UR44+T?
MXD1812UR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812UR44+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 MXD1812UR44+T?
For technical support, including MXD1812UR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812UR44+T requirements.
6.How does Aetrix verify that MXD1812UR44+T is sourced from the original manufacturer or authorized distributors?
All MXD1812UR44+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 MXD1812UR44+T meets industry standards.
7.What is the process for return or replacement of MXD1812UR44+T?
All MXD1812UR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812UR44+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 MXD1812UR44+T part is unused and in its original packaging.
Return procedure for MXD1812UR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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