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Analog Devices Inc./Maxim Integrated MXD1812XR44+T
- Part No.:
- MXD1812XR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1812XR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,461
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Product details
Overview
MXD1812XR44+T from Maxim Integrated is a low-power microprocessor reset supervisor IC with active-high push-pull RESET output, factory-set 4.37V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors +5V systems, provides transient-immune power-supply supervision, and eliminates external components in embedded controllers and portable equipment.
For engineers reviewing the MXD1812XR44+T datasheet, MXD1812XR44+T pinout, MXD1812XR44+T application, or MXD1812XR44+T equivalent, key selection criteria include reset polarity (active-high), SC70-3 package compatibility, guaranteed logic validity at low VCC, manual-reset absence, and precision threshold stability across -40°C to +105°C.
Technical Context
The MXD1812XR44+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 4.37V, triggering an internal timer that holds RESET high for ≥100ms after VCC recovers. Its push-pull output drives directly into CMOS inputs without external pullups, and its BiCMOS process ensures 4μA typical supply current at +25°C.
Unlike MXD1813/MXD1818 variants, it lacks manual-reset detection circuitry and debouncing logic; its RESET pin functions solely as output. The device guarantees valid RESET assertion even as VCC declines to +1V, enabling robust brownout recovery in battery-powered systems where supply collapse is gradual.
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 rail collapse before microprocessor malfunction |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for full μP initialization during power-up or recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| VCC Operating Range | +1.0V to +5.5V - supports valid reset assertion during deep brownout and allows system-level power sequencing |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to μP reset input |
| Package | 3-pin SC70 - 2.0mm × 2.1mm footprint ideal for space-constrained portable PCBs |
| Temperature Range | -40°C to +105°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MXD1812XR44+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with pin 1 = RESET (active-high push-pull output), pin 2 = VCC (supply and threshold monitor input), and pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives high when VCC < 4.37V, remains high ≥100ms after VCC exceeds threshold |
| 2 | VCC | Main supply input and analog reference for reset comparator; also powers internal logic and output stage |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to minimize noise-induced false resets |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Factory-trimmed 4.37V with ±2.5% tolerance over full temperature range - eliminates calibration overhead in production test |
| No external components required | Integrated comparator, timer, and push-pull driver - reduces BOM count and PCB area vs. discrete reset solutions |
| Low supply current | 4μA typical at +3.6V - extends battery life in always-on monitoring applications such as smart meters and asset trackers |
| VCC = +1V logic validity | RESET output remains valid down to VCC = +1V - ensures deterministic reset behavior during slow power decay |
| Transient immunity | Rejects fast negative-going VCC glitches ≤1.5μs at 4.37V overdrive - prevents spurious resets in noisy power environments |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules operating on unregulated 5V rails subject to load transients and thermal cycling. IC Role / Device Role / Timing Role: Supervises main 5V supply and asserts active-high RESET to ARM Cortex-M4 microcontroller during brownout. Use Value: Prevents firmware corruption by guaranteeing ≥100ms reset pulse even as VCC decays to +1V, ensuring clean boot sequence. |
Use Scenario: Handheld glucose meters powered by single alkaline cell with declining voltage profile. IC Role / Device Role / Timing Role: Monitors regulated 5V rail derived from boost converter; triggers reset when battery sag causes rail collapse. Use Value: Enables reliable low-battery shutdown via active-high signal to MCU, avoiding data loss during final discharge phase. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Fanless Ethernet switches exposed to wide ambient temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Provides cold-start reset to MIPS-based SoC during initial power application after storage. Use Value: Ensures deterministic boot at -40°C due to guaranteed reset assertion at VCC ≥ +1V and ±2.5% threshold accuracy. |
Use Scenario: DIN-rail mounted electricity meters with isolated 5V auxiliary supply derived from mains. IC Role / Device Role / Timing Role: Detects AC line dropout events and initiates controlled firmware save-and-halt via active-high RESET. Use Value: Eliminates need for external RC network while maintaining 100ms timeout compliance per IEC 62056 standards. |
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 reset threshold, SOT23-3 package, 140μA max supply current | Higher threshold and higher quiescent current - less suitable for low-VCC brownout detection | Select when tighter 4.63V trip point is needed for +5V systems with narrow tolerance margins |
| TPS3808G33DBVR | 3.3V reset threshold, open-drain output, 1.6μA typical ICC, 200ms timeout | Lower threshold and different output type - incompatible for +5V monitoring without level-shifting | Prefer for 3.3V systems requiring ultra-low power; not drop-in for MXD1812XR44+T's 4.37V/active-high use case |
Compared with MAX809TRD3+T and TPS3808G33DBVR, MXD1812XR44+T uniquely combines 4.37V precision threshold, active-high push-pull drive, sub-5μA consumption, and SC70 packaging - making it optimal for space- and power-constrained +5V industrial controllers requiring deterministic low-VCC reset behavior.
Availability
MXD1812XR44+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, network edge routers, smart energy meters, and battery-backed instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MXD1812XR44+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, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MXD1810–MXD1818 family was engineered specifically for cost-sensitive, space-constrained microprocessor reset supervision in portable and industrial systems - emphasizing low power, no-component operation, and guaranteed performance from -40°C to +105°C.
FAQ
What is the reset threshold voltage of MXD1812XR44+T and how accurate is it over temperature?
The MXD1812XR44+T has a factory-set reset threshold of 4.37V with ±2.5% accuracy over the full operating temperature range of -40°C to +105°C. This specification is guaranteed by design and verified in production testing at +25°C, with limits extrapolated across temperature using characterization data. The threshold remains stable against supply transients and ensures consistent detection of +5V rail collapse in demanding environments.
Does MXD1812XR44+T support manual reset functionality via the RESET pin?
No, MXD1812XR44+T does not support manual reset. Unlike MXD1813/MXD1818 variants, it lacks internal debouncing circuitry and push-button detect logic. Its RESET pin is output-only and active-high; applying an external signal to this pin is not supported and may damage the device. Manual reset capability requires selecting MXD1813XR44+T or MXD1818XR44+T instead.
What package type and footprint does MXD1812XR44+T use?
MXD1812XR44+T uses the 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm with 0.65mm pitch. This compact footprint is optimized for high-density PCB layouts in portable electronics. Pin 1 is RESET (active-high), pin 2 is VCC, and pin 3 is GND - matching standard SC70 orientation and compatible with automated pick-and-place assembly.
Can MXD1812XR44+T operate reliably when VCC drops below 2.0V?
Yes, MXD1812XR44+T guarantees valid RESET output down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal circuitry maintains correct logic state and timing integrity even during deep brownout conditions, enabling safe microprocessor shutdown in battery-powered systems where supply voltage decays gradually.
How does the active-high push-pull output of MXD1812XR44+T simplify system design?
The active-high push-pull output of MXD1812XR44+T eliminates the need for an external pullup resistor, reducing component count and PCB area. It directly drives standard CMOS reset inputs without level translation or current-limiting resistors, ensuring fast, low-impedance transitions and compatibility with most microcontrollers requiring active-high reset assertion - including many ARM Cortex-M and Renesas RL78 derivatives.
MXD1812XR44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- SC-70-3
MXD1812XR44+T FAQ
1.How can I place an order for MXD1812XR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812XR44+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 MXD1812XR44+T reliable?
The price and inventory of MXD1812XR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812XR44+T is usually 5 days.
3.What payment methods are accepted for MXD1812XR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812XR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812XR44+T?
MXD1812XR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812XR44+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 MXD1812XR44+T?
For technical support, including MXD1812XR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812XR44+T requirements.
6.How does Aetrix verify that MXD1812XR44+T is sourced from the original manufacturer or authorized distributors?
All MXD1812XR44+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 MXD1812XR44+T meets industry standards.
7.What is the process for return or replacement of MXD1812XR44+T?
All MXD1812XR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812XR44+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 MXD1812XR44+T part is unused and in its original packaging.
Return procedure for MXD1812XR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1812XR44+T Tags
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