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Analog Devices Inc./Maxim Integrated MXD1816XR31
- Part No.:
- MXD1816XR31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1816XR31.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
MXD1816XR31 from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain, active-low RESET output and internal 5.5kΩ pullup resistor, designed for +2.5V/+3.0V/+3.3V systems. It monitors VCC and asserts reset when supply drops below 3.06V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, operates from -40°C to +105°C, and draws only 4μA typical supply current - ideal for portable/battery-powered equipment requiring reliable power-on reset.
For engineers reviewing the MXD1816XR31 datasheet, MXD1816XR31 pinout, MXD1816XR31 application, or MXD1816XR31 equivalent, this device serves as a precision voltage-monitoring reset controller for critical μP/μC power sequencing in space-constrained industrial and embedded designs where low quiescent current and factory-trimmed threshold accuracy are essential.
Technical Context
The MXD1816XR31 implements a bandgap-based voltage comparator with hysteresis to detect VCC falling below its factory-set 3.06V threshold, triggering an open-drain RESET assertion. Its internal timer guarantees minimum 100ms reset timeout after VCC rises above threshold, independent of VCC slew rate.
This variant belongs to the MXD1815–MXD1818 subfamily for 2.5V/3.0V/3.3V systems and features no manual-reset input - unlike MXD1818 - and lacks debounced push-button detection. Its open-drain output interfaces directly with bidirectional μP reset pins without external pullup components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for 3.3V systems with margin against noise-induced false triggers |
| Reset Timeout Period | 100ms minimum - guarantees sufficient reset hold time for full μP initialization during power-up or recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in always-on portable monitoring applications |
| Operating Voltage Range | 1.2V to 5.5V - supports valid RESET logic state down to VCC = +1V, enabling robust operation during deep brownouts |
| Output Type | Open-drain, active-low with 5.5kΩ internal pullup - eliminates need for external resistor and simplifies interface to bidirectional μP reset pins |
| Package | 3-pin SC70 - 2.0mm × 1.25mm footprint ideal for ultra-compact PCB layouts in handheld and IoT edge devices |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded control environments |
Pinout & Package
MXD1816XR31 is housed in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.9mm, with gull-wing leads and RoHS-compliant lead-free finish. The package supports reflow soldering per JEDEC J-STD-020 and is rated for 150°C peak reflow temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SC70) / 2 (SOT23) | RESET | Open-drain, active-low reset output; requires external pullup only if interfacing with non-5.5kΩ-compatible logic; sinks up to 10mA when asserted |
| 2 (SC70) / 1 (SOT23) | VCC | Power supply input and reset-threshold reference; monitors system rail; functional down to +1.2V |
| 3 | GND | Analog ground reference for internal comparator and timer; must be connected to system ground plane for stable threshold accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 3.06V threshold | Eliminates external resistor network and calibration effort for 3.3V system supervision |
| 4μA typical supply current | Reduces standby power consumption by >90% versus discrete RC reset solutions in battery-critical designs |
| Internal 5.5kΩ pullup resistor | Enables direct connection to μP reset pins without external components - saves board area and BOM cost |
| 100ms fixed reset timeout | Guarantees sufficient reset duration for all common ARM Cortex-M and RISC-V microcontrollers |
| ±2.5% threshold accuracy over temp | Maintains precise brownout detection across industrial temperature range without trimming or compensation |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
Use Scenario: Power monitoring in DIN-rail mounted programmable logic controllers where transient immunity and long-term reliability are mandatory. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring deterministic μP boot sequence after AC/DC converter startup or brownout events. Use Value: Prevents firmware corruption during unstable 24V DC input conditions using factory-trimmed 3.06V threshold and 100ms timeout. | Use Scenario: Battery-powered wearable ECG or SpO₂ sensors requiring ultra-low-power reset supervision during intermittent wake cycles. IC Role / Device Role / Timing Role: Low-quiescent-current voltage monitor that asserts reset during battery voltage sag below 3.06V, enabling safe shutdown before data loss. Use Value: 4μA supply current extends single-CR2032 battery life beyond 5 years in sleep-dominated operation. |
| Smart Meter Communication Modules | IoT Edge Gateway Controllers |
Use Scenario: Reset management for NB-IoT or LoRaWAN modems integrated into electricity/water meters exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision reset supervisor maintaining valid RESET signal down to VCC = +1.2V across -40°C to +105°C operating range. Use Value: Ensures reliable modem restart after grid voltage dips while meeting IEC 62056 and EN 13757 compliance requirements. | Use Scenario: Power sequencing in compact gateways aggregating Zigbee, BLE, and Ethernet traffic in smart building infrastructure. IC Role / Device Role / Timing Role: Open-drain reset controller interfacing directly with bidirectional reset pins of dual-core application processors (e.g., NXP i.MX RT series). Use Value: Internal 5.5kΩ pullup eliminates external component, reducing layout complexity and improving signal integrity on high-density PCBs. |
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, SOT23-3 package, 12μA max ICC, no internal pullup - requires external 47kΩ pullup | Higher supply current and external component requirement reduce suitability for ultra-low-power portable designs | Select when legacy SOT23 footprint compatibility is required and 12μA ICC is acceptable |
| TPS3808G30DBVR | 3.0V threshold, 1.6μA typical ICC, adjustable timeout via capacitor, SOT23-6 - larger footprint and more complex configuration | Capacitor-programmable timeout adds flexibility but increases BOM count and layout area versus fixed 100ms solution | Select when timeout customization is needed and lower ICC outweighs added design overhead |
Compared with MAX809TRD3-T and TPS3808G30DBVR, MXD1816XR31 delivers optimal balance of ultra-low 4μA current, factory-trimmed 3.06V accuracy, internal pullup, and minimal 3-pin SC70 footprint - making it superior for space- and power-constrained 3.3V embedded systems where simplicity and long battery life are primary drivers.
Availability
MXD1816XR31 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensors, smart meter communication modules, and IoT edge gateway controllers requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MXD1816XR31 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 MXD1810–MXD1818 family was engineered specifically for low-power, high-accuracy microprocessor reset supervision in space-constrained embedded systems - emphasizing factory-trimmed thresholds, minimal external components, and extended temperature operation.
FAQ
What is the exact reset threshold voltage of the MXD1816XR31 and how stable is it over temperature?
The MXD1816XR31 has a factory-set reset threshold of 3.06V, with guaranteed accuracy of ±2.5% across the full -40°C to +105°C operating range. This stability is achieved through laser-trimmed bandgap reference circuitry and is confirmed in the Electrical Characteristics table under "Reset Threshold" for suffix R31. The MXD1816XR31 maintains this precision without external calibration or compensation components.
Does the MXD1816XR31 support manual reset functionality via the RESET pin?
No, the MXD1816XR31 does not include manual reset detection. Unlike the MXD1818XR31 (which features debounced push-button reset), the MXD1816XR31 is a dedicated power-supply monitor with reset assertion solely triggered by VCC falling below 3.06V. Its RESET pin is output-only and cannot be used as an input for external reset initiation - this is explicitly confirmed in the Pin Descriptions and Selector Guide sections of the datasheet.
What is the function of the internal pullup resistor in the MXD1816XR31, and what is its nominal value?
MXD1816XR31 includes an internal 5.5kΩ pullup resistor connected to the open-drain RESET output, enabling direct interface with microprocessors that have bidirectional reset pins (e.g., Motorola 68HC11) without requiring an external pullup. This resistor ensures a defined high state when RESET is not asserted, and its value is specified in the Electrical Characteristics table under "Internal Pullup Resistor, Open-Drain" for MXD1816 devices. The MXD1816XR31 thus reduces BOM count and PCB area versus alternatives needing external resistors.
Can the MXD1816XR31 operate reliably at VCC levels below 2.5V, and down to what voltage does RESET remain valid?
Yes, the MXD1816XR31 is guaranteed to maintain valid RESET logic states down to VCC = +1.2V over temperature, and functional operation is specified from VCC = +1.0V (with degraded timing). The datasheet confirms RESET remains asserted or deasserted correctly even at 1.2V, supporting brownout detection in deeply undervolted conditions. However, the MXD1816XR31's open-drain output may drift inactive below ~1.5V due to reduced sinking capability - so applications requiring RESET validity at VCC < 1.5V should use push-pull variants like MXD1817XR31 instead.
Is the MXD1816XR31 pin-compatible with other devices in the MXD181x family, and which packages does it support?
Yes, the MXD1816XR31 shares identical 3-pin SC70 pinout and electrical behavior with all other MXD181x variants in the same package type (e.g., MXD1815XR31, MXD1817XR31), differing only in reset threshold and output configuration. It is offered exclusively in the 3-pin SC70 package (X3-2 outline), not SOT23 - confirmed by the Ordering Information table where "XR" denotes SC70 and "UR" denotes SOT23. The MXD1816XR31's pin mapping (Pin 1 = RESET, Pin 2 = VCC, Pin 3 = GND) is consistent across all SC70 versions.
MXD1816XR31 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.06V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MXD1816XR31 FAQ
1.How can I place an order for MXD1816XR31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816XR31 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 MXD1816XR31 reliable?
The price and inventory of MXD1816XR31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816XR31 is usually 5 days.
3.What payment methods are accepted for MXD1816XR31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816XR31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816XR31?
MXD1816XR31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816XR31 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 MXD1816XR31?
For technical support, including MXD1816XR31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816XR31 requirements.
6.How does Aetrix verify that MXD1816XR31 is sourced from the original manufacturer or authorized distributors?
All MXD1816XR31 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 MXD1816XR31 meets industry standards.
7.What is the process for return or replacement of MXD1816XR31?
All MXD1816XR31 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816XR31, 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 MXD1816XR31 part is unused and in its original packaging.
Return procedure for MXD1816XR31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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