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Analog Devices Inc./Maxim Integrated MXD1816UR31+T
- Part No.:
- MXD1816UR31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1816UR31+T.pdf
- Description:
- IC MPU RESET CIRC 3.06V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MXD1816UR31+T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC supply voltage with a factory-trimmed 3.06V reset threshold (±2.5% over temperature), asserts reset for ≥100ms after VCC recovery, and features an internal 5.5kΩ pullup resistor - eliminating external components in portable equipment power-up sequencing.
For engineers reviewing the MXD1816UR31+T datasheet, MXD1816UR31+T pinout, MXD1816UR31+T application, or MXD1816UR31+T equivalent, key selection criteria include its 3-pin SOT23 package, 4µA quiescent current, guaranteed RESET validity down to VCC = +1V, and compatibility with bidirectional μP reset pins such as those on Motorola 68HC11 controllers.
Technical Context
The MXD1816UR31+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 3.06V, coupled with a monostable timer that enforces a minimum 100ms reset timeout period upon VCC recovery. Its open-drain output architecture allows direct interfacing with microcontrollers having bidirectional reset inputs without external pullups.
This device operates across -40°C to +105°C, draws only 4µA typical supply current at +3.6V, and provides transient immunity against negative-going VCC glitches up to 100µs duration when overdriven by 20mV - ensuring robust reset assertion during brownout and power-supply noise events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06V ±2.5% over -40°C to +105°C - ensures reliable power-on reset initiation for 3.3V systems with margin against supply tolerance drift |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for μP initialization before release of reset signal |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in portable instrumentation and handheld devices |
| Output Type | Open-drain, active-low with internal 5.5kΩ pullup - supports wired-OR reset buses and bidirectional μP reset pins without external components |
| Operating Voltage Range | +1.0V to +5.5V - permits valid reset signaling even during deep brownout conditions down to 1V VCC |
| Package | SOT23-3 - space-constrained footprint compatible with automated PCB assembly and high-density layouts |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1816UR31+T is housed in a 3-pin SOT23 package (outline U3-1), with pin 1 = RESET (open-drain active-low), pin 2 = VCC (supply and threshold monitor input), and pin 3 = GND. The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant (lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain, active-low reset output; sinks current when asserted; pulled high internally to VCC via 5.5kΩ resistor |
| 2 | VCC | Primary supply input and reset threshold reference point; monitored continuously for undervoltage detection |
| 3 | GND | System ground reference for comparator and timer circuitry; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated 5.5kΩ pullup and precision voltage reference eliminate discrete resistors and capacitors in reset circuit design |
| Factory-set 3.06V threshold | Reduces BOM count and calibration effort for 3.3V systems; ±2.5% accuracy maintained across full temperature range |
| 100ms fixed reset timeout | Guarantees μP core and peripherals fully stabilize before release - avoids race conditions in boot sequence |
| 4µA ultra-low supply current | Enables always-on monitoring in battery-powered IoT sensors and portable medical devices without compromising runtime |
| VCC = +1V reset validity | Ensures deterministic reset state during deep brownout - prevents undefined μP behavior when supply collapses near cutoff |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules operating in harsh factory environments with fluctuating 3.3V rail stability. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low signal to ARM Cortex-M7 MCU during brownout events. Use Value: Prevents firmware corruption by holding reset until 3.3V rail stabilizes above 3.06V for ≥100ms - verified across -40°C to +105°C. |
Use Scenario: Handheld glucose meters powered by single-cell Li-ion batteries with dynamic 2.8–3.6V discharge profile. IC Role / Device Role / Timing Role: Low-power reset supervisor enabling safe boot after battery insertion or wake-from-sleep transitions. Use Value: 4µA quiescent current extends battery life; 3.06V threshold aligns with end-of-discharge voltage to avoid premature shutdown. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Fanless Ethernet switches using 3.3V FPGA configuration power rail subject to ESD-induced transients. IC Role / Device Role / Timing Role: Reset monitor with transient immunity rejecting <100µs VCC glitches while asserting clean reset pulse. Use Value: Eliminates spurious resets during EMC testing - validated per IEC 61000-4-2/4-4 compliance requirements. |
Use Scenario: DIN-rail mounted electricity meters requiring long-term reliability under wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade reset supervisor interfacing with bidirectional reset pin of TI MSP430FR5994 MCU. Use Value: Open-drain output enables shared reset bus with other subsystems; -40°C to +105°C rating matches meter enclosure thermal profile. |
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 timeout, 1.2µA supply current, SC70-3 only | Lacks internal pullup; requires external resistor for open-drain operation | Select when lowest possible quiescent current is critical and board space permits SC70 footprint |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, 16µA supply current, adjustable delay via capacitor | Requires external timing capacitor; no internal pullup | Choose when programmable timeout is needed and higher supply current is acceptable |
Compared with MXD1816UR31+T, MAX809TRD3+T offers lower ICC but lacks integrated pullup and SOT23 packaging, while TPS3808G33DBVR provides configurable timing at the cost of added passive components and higher power - making MXD1816UR31+T optimal for compact, component-minimized 3.3V system reset design.
Availability
MXD1816UR31+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 with full lifecycle support.
Supply support for MXD1816UR31+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 consumer applications - emphasizing reliability, integration, and low-power operation.
The MXD1810–MXD1818 family was developed specifically to replace discrete reset circuits in space-constrained, battery-sensitive μP systems - delivering factory-trimmed thresholds, zero-external-component operation, and extended temperature performance.
FAQ
What is the exact reset threshold voltage of MXD1816UR31+T and how tightly is it specified?
The MXD1816UR31+T has a factory-set reset threshold of 3.06V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R31" entry, where min/typ/max are 2.98V/3.06V/3.15V. The threshold is trimmed during production and does not require external calibration.
Does MXD1816UR31+T support manual reset functionality via the RESET pin?
No, MXD1816UR31+T does not include manual reset detection. Only MXD1813/MXD1818 variants feature debounced push-button reset capability triggered by a >1.5µs low pulse on the RESET pin. MXD1816UR31+T is an open-drain active-low reset supervisor without manual reset logic - its RESET pin serves solely as output.
Can MXD1816UR31+T be used with microcontrollers that have bidirectional reset pins?
Yes, MXD1816UR31+T is explicitly designed for this use case. Its open-drain RESET output interfaces directly with bidirectional reset pins (e.g., Motorola 68HC11) without external components. The internal 5.5kΩ pullup resistor ensures proper high-state biasing, and the output can be actively pulled low by either the MXD1816UR31+T or the μP itself.
What is the maximum supply voltage the MXD1816UR31+T can withstand on VCC?
The absolute maximum VCC rating for MXD1816UR31+T is +6.0V, as stated in the Absolute Maximum Ratings table. However, functional operation is guaranteed only from +1.0V to +5.5V. Operation above +5.5V may cause permanent damage and is outside specification - design margins should maintain VCC ≤5.5V under all conditions.
Is MXD1816UR31+T compatible with lead-free PCB assembly processes?
Yes, MXD1816UR31+T is lead-free and RoHS-compliant. The "+T" suffix denotes lead-free packaging, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for standard reflow profiles. Its SOT23-3 package is qualified for peak reflow temperatures up to +260°C.
MXD1816UR31+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:
- 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:
- SOT-23-3
MXD1816UR31+T FAQ
1.How can I place an order for MXD1816UR31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816UR31+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 MXD1816UR31+T reliable?
The price and inventory of MXD1816UR31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816UR31+T is usually 5 days.
3.What payment methods are accepted for MXD1816UR31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816UR31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816UR31+T?
MXD1816UR31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816UR31+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 MXD1816UR31+T?
For technical support, including MXD1816UR31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816UR31+T requirements.
6.How does Aetrix verify that MXD1816UR31+T is sourced from the original manufacturer or authorized distributors?
All MXD1816UR31+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 MXD1816UR31+T meets industry standards.
7.What is the process for return or replacement of MXD1816UR31+T?
All MXD1816UR31+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816UR31+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 MXD1816UR31+T part is unused and in its original packaging.
Return procedure for MXD1816UR31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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