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Analog Devices Inc./Maxim Integrated MXD1815UR31
- Part No.:
- MXD1815UR31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1815UR31.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
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Product details
Overview
MXD1815UR31 from Maxim Integrated is a precision microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC and asserts an active-low push-pull RESET signal when supply voltage drops below 3.06V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, draws only 4μA typical supply current, and operates across –40°C to +105°C - enabling reliable power-on reset in portable embedded controllers.
For engineers reviewing the MXD1815UR31 datasheet, MXD1815UR31 pinout, MXD1815UR31 application, or MXD1815UR31 equivalent, key selection criteria include its factory-trimmed 3.06V reset threshold, push-pull output architecture (no external pullup required), guaranteed RESET validity down to VCC = +1V, and compatibility with space-constrained SOT23-3 layouts in battery-powered instrumentation and industrial microcontroller systems.
Technical Context
The MXD1815UR31 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC droop below its fixed 3.06V threshold, coupled with a monolithic timer that enforces a minimum 100ms reset timeout period after VCC rises above threshold. Its push-pull output stage drives RESET low actively and pulls it high internally without external components.
This device belongs to the MXD1815–MXD1818 subfamily optimized for 2.5V/3.0V/3.3V systems and excludes manual-reset debounce circuitry - distinguishing it from MXD1818UR31. It guarantees correct logic state down to VCC = +1V and rejects fast transients via built-in immunity design, making it suitable for brownout detection in noise-prone embedded environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06V ±2.5% over –40°C to +105°C - ensures consistent brownout detection across industrial temperature range |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in coin-cell–powered portable devices |
| Operating Voltage Range | +1.0V to +5.5V - supports valid RESET assertion even during deep brownout down to 1V |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and simplifies μP interface |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
| Temperature Range | –40°C to +105°C - qualified for under-hood automotive peripherals and industrial control units |
Pinout & Package
MXD1815UR31 is housed in a 3-pin SOT23 package (U3-1 outline) with gull-wing leads, 1.3mm pitch, and JEDEC-standard footprint (land pattern 90-0179). The package supports reflow soldering and is available in both leaded and RoHS-compliant variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and reset-threshold monitoring node - must be decoupled locally to suppress transients |
| 2 | RESET | Active-low push-pull output - drives low during reset; actively pulls high when deasserted; interfaces directly to μP reset pin |
| 3 | GND | Analog and digital ground reference - requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Factory-trimmed 3.06V with ±2.5% accuracy over full temperature range - eliminates calibration overhead in production |
| No external components | Self-contained reset generator with internal comparator, timer, and push-pull driver - reduces BOM count and board area |
| Low-power operation | 4μA typical ICC - extends battery life in always-on monitoring applications such as smart sensors |
| Brownout immunity | Guaranteed RESET assertion down to VCC = +1V - ensures deterministic reset behavior during severe undervoltage events |
| Transient rejection | Designed to ignore fast VCC glitches (e.g., <1µs negative spikes) - prevents spurious resets in electrically noisy environments |
Applications
| Industrial Microcontroller Supervision | Portable Medical Instrumentation |
|---|---|
Use Scenario: Monitoring 3.3V power rails in programmable logic controllers (PLCs) deployed in factory automation cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary power-on and brownout reset supervisor - asserts RESET until VCC stabilizes above 3.06V and holds it for ≥100ms to ensure firmware boot integrity. Use Value: Prevents corrupted memory writes and undefined MCU states during unstable line conditions, improving system MTBF by eliminating uncontrolled restarts. |
Use Scenario: Power sequencing and fault detection in handheld glucose meters powered by single-cell lithium batteries. IC Role / Device Role / Timing Role: Low-voltage lockout (UVLO) and cold-start supervisor - triggers hard reset if battery sags below 3.06V during peak sensor activation. Use Value: Enables safe shutdown before data loss occurs, preserving calibration history and patient measurement logs during battery depletion. |
| Smart Energy Metering | Industrial IoT Edge Node |
Use Scenario: Ensuring reliable boot of metrology SoCs in DIN-rail-mounted electricity meters exposed to grid harmonics and lightning-induced surges. IC Role / Device Role / Timing Role: Immune reset generator - detects sustained undervoltage (not transient dips) and initiates controlled reboot only when VCC remains below 3.06V for >100ms. Use Value: Avoids false resets from switching noise while guaranteeing recovery from actual grid faults - critical for revenue-grade metering compliance. |
Use Scenario: Supervising dual-core ARM Cortex-M7/M4 subsystems in wireless vibration sensors mounted on rotating machinery. IC Role / Device Role / Timing Role: System-level power integrity monitor - coordinates reset timing between processing and radio domains using a shared, glitch-free RESET signal. Use Value: Eliminates race conditions during wake-from-sleep transitions, ensuring synchronized firmware execution and RF link stability. |
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 | 3.08V reset threshold, 140ms min timeout, SOT23-3, same 4μA ICC | Lacks guaranteed operation down to VCC = +1V; specified only to +1.2V | Acceptable where brownout depth is shallow and system VCC rarely falls below 1.2V |
| TPS3808G30DBVR | 3.0V threshold, 200ms min timeout, 1.5μA ICC, open-drain output | Requires external pullup; not pin-compatible due to different pin 2 function (EN vs RESET) | Preferred for ultra-low-power designs where external pullup is acceptable and longer timeout improves robustness |
Compared with MXD1815UR31, MAX809TRD3-T offers tighter threshold tolerance but reduced brownout margin, while TPS3808G30DBVR delivers lower quiescent current at the cost of added BOM complexity and non-drop-in layout integration.
Availability
MXD1815UR31 is available at Aetrix Electronics and suitable for industrial microcontroller supervision, portable medical instrumentation, smart energy metering, and industrial IoT edge node applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MXD1815UR31 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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MXD1815UR31 belongs to Maxim's μP reset supervisor product line, engineered specifically for low-power, precision voltage monitoring in space-constrained embedded systems operating across extended industrial temperatures.
FAQ
What is the exact reset threshold voltage of the MXD1815UR31 and how stable is it over temperature?
The MXD1815UR31 has a factory-set reset threshold of 3.06V with ±2.5% accuracy over the full –40°C to +105°C operating range. This specification is guaranteed by design and production-tested, ensuring consistent brownout detection without calibration. The device uses a precision bandgap reference and trimmed comparator to maintain threshold stability against thermal drift and process variation.
Does the MXD1815UR31 require any external components to function as a reset supervisor?
No, the MXD1815UR31 requires no external components. Its push-pull RESET output eliminates the need for an external pullup resistor, and its internal voltage reference, comparator, and timer are fully integrated. Only standard VCC decoupling (e.g., 0.1μF ceramic capacitor near pin 1) is recommended to suppress high-frequency noise on the supply rail.
Can the MXD1815UR31 operate reliably when the supply voltage drops below 2.0V?
Yes - the MXD1815UR31 guarantees correct RESET/RESET logic state down to VCC = +1.0V, per its Absolute Maximum Ratings and Electrical Characteristics table. This allows it to assert a valid reset signal even during deep brownout conditions common in battery-powered systems, unlike many competitors rated only to 1.2V or higher.
Is the MXD1815UR31 pin-compatible with other devices in the MXD181x family?
Yes, all MXD181x devices share identical 3-pin SOT23 and SC70 footprints and pinouts: pin 1 = VCC, pin 2 = RESET, pin 3 = GND. However, output type (push-pull vs. open-drain), reset threshold, and manual-reset capability differ across variants - so electrical compatibility must be verified per application requirements, even though mechanical layout is interchangeable.
What is the minimum reset timeout period for the MXD1815UR31 and is it adjustable?
The MXD1815UR31 provides a fixed minimum reset timeout period of 100ms after VCC rises above the 3.06V threshold. This value is not user-adjustable - it is implemented with an internal RC timer and guaranteed across temperature and voltage. The typical timeout is 150ms, with a maximum of 250ms, providing margin for worst-case startup sequences in microcontrollers.
MXD1815UR31 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:
- 3.06V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MXD1815UR31 FAQ
1.How can I place an order for MXD1815UR31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1815UR31 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 MXD1815UR31 reliable?
The price and inventory of MXD1815UR31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1815UR31 is usually 5 days.
3.What payment methods are accepted for MXD1815UR31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1815UR31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1815UR31?
MXD1815UR31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1815UR31 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 MXD1815UR31?
For technical support, including MXD1815UR31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1815UR31 requirements.
6.How does Aetrix verify that MXD1815UR31 is sourced from the original manufacturer or authorized distributors?
All MXD1815UR31 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 MXD1815UR31 meets industry standards.
7.What is the process for return or replacement of MXD1815UR31?
All MXD1815UR31 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1815UR31, 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 MXD1815UR31 part is unused and in its original packaging.
Return procedure for MXD1815UR31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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