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Analog Devices Inc./Maxim Integrated MXD1816UR23+
- Part No.:
- MXD1816UR23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1816UR23+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,582
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Product details
Overview
MXD1816UR23+ from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT23-3 package, designed to monitor +2.5V/+3.0V/+3.3V power supplies and assert an active-low open-drain RESET signal when VCC drops below 2.31V (±2.5% over temperature), with 100ms minimum reset timeout and internal 5.5kΩ pullup resistor - used in portable battery-powered controllers and embedded systems requiring reliable brownout protection.
For engineers reviewing the MXD1816UR23+ datasheet, MXD1816UR23+ pinout, MXD1816UR23+ application, or MXD1816UR23+ equivalent, key selection criteria include reset threshold accuracy (±2.5%), guaranteed RESET validity down to VCC = +1V, open-drain output compatibility with bidirectional μP reset pins, and immunity to sub-5µs VCC transients.
Technical Context
The MXD1816UR23+ implements a precision bandgap-based voltage comparator with factory-trimmed 2.31V reset threshold, coupled to a monostable timer that guarantees ≥100ms reset assertion after VCC recovery. Its open-drain RESET output includes an internal 5.5kΩ pullup resistor, eliminating external components while enabling direct interface with bidirectional microcontroller reset pins like those on Motorola 68HC11.
Unlike push-button–capable variants (MXD1813/MXD1818), MXD1816UR23+ lacks manual-reset detection circuitry and debouncing logic; it responds solely to VCC supply monitoring. It operates across –40°C to +105°C and draws only 4µA typical supply current at +3.6V, making it suitable for ultra-low-power portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% over –40°C to +105°C - ensures reliable brownout detection for +2.5V/+3.3V systems without calibration. |
| Reset Timeout Period | 100ms minimum - guarantees sufficient reset hold time for μP initialization during power-up or recovery. |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in always-on portable equipment. |
| Operating Voltage Range | +1.0V to +5.5V - allows valid RESET output assertion even as VCC declines to near-undervoltage levels. |
| Output Type | Open-drain, active-low with internal 5.5kΩ pullup - supports wired-OR configurations and bidirectional μP reset pins without external resistor. |
| VCC Transient Immunity | Rejects negative-going transients <5µs at 2.31V overdrive - prevents false resets from noise or switching spikes. |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
MXD1816UR23+ is housed in a 3-pin SOT23 package (JEDEC MO-178AA) with gull-wing leads, rated for –40°C to +105°C operation and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and reset-threshold monitoring node - powers internal comparator and timer; must be decoupled locally. |
| 2 | RESET | Open-drain, active-low reset output - sinks current when asserted; pulled high internally to VCC via 5.5kΩ resistor. |
| 3 | GND | Analog and digital ground reference - requires low-impedance connection to system ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Threshold | Factory-set 2.31V with ±2.5% tolerance over full temperature range - eliminates need for external trimming or calibration. |
| No External Components Required | Integrated pullup resistor and comparator - reduces BOM count and board space vs. discrete reset solutions. |
| Ultra-Low Quiescent Current | 4µA typical at +3.6V - extends battery life in portable instrumentation and IoT edge nodes. |
| Bidirectional Reset Pin Compatibility | Open-drain output interfaces directly with μPs like 68HC11 without external pullup - simplifies system-level reset arbitration. |
| Wide Supply Range Support | Valid operation from VCC = +1.0V - ensures deterministic reset behavior during deep brownout conditions. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered handheld ECG or glucose meters requiring fail-safe startup and brownout recovery. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low RESET until stable +3.3V rail is confirmed and held for ≥100ms. Use Value: Prevents erratic firmware execution during weak-battery power-up by guaranteeing minimum reset pulse width and accurate 2.31V threshold detection. | Use Scenario: DIN-rail mounted programmable logic controller modules operating in harsh industrial environments. IC Role / Device Role / Timing Role: Power-supply monitor for +2.5V FPGA configuration rails and +3.3V microcontroller cores. Use Value: Ensures deterministic system reset under voltage sags caused by motor switching noise, leveraging ±2.5% threshold accuracy and transient immunity. |
| Smart Energy Meters | Wireless Sensor Nodes |
Use Scenario: ANSI C12.22-compliant electricity meters with dual-supply architectures (mains + backup battery). IC Role / Device Role / Timing Role: Primary reset supervisor for the meter's ARM Cortex-M4 host processor during AC line dropout events. Use Value: Maintains RESET assertion down to VCC = +1.0V, enabling graceful shutdown and nonvolatile state preservation before complete power loss. | Use Scenario: LoRaWAN or NB-IoT endpoint nodes powered by coin-cell batteries with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Low-quiescent-current reset circuit ensuring clean boot of ultra-low-power MCU after cold start from storage voltage. Use Value: 4µA supply current minimizes standby drain, while 2.31V threshold aligns precisely with lithium-thionyl chloride cell discharge 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 | 2.93V reset threshold, 140ms min timeout, 3.5µA ICC, same SOT23-3 package | Higher threshold better suited for +3.3V-only systems with tighter margin; no internal pullup - requires external resistor for open-drain use | Select when higher reset voltage and longer timeout are acceptable, and external pullup is permissible. |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 200ms min timeout, 1.1µA ICC, SOT23-6 package | Requires 3 extra pins and external resistor network; lower ICC but larger footprint and design complexity | Choose only if programmable threshold and ultra-low current (<2µA) outweigh board space and component count penalties. |
Compared with MAX809TRD3+T and TPS3808G125DBVR, MXD1816UR23+ offers optimal balance for +2.5V/+3.3V systems: precise 2.31V threshold matching common LDO outputs, integrated pullup eliminating one passive, and industry-standard SOT23-3 footprint - all at 4µA consumption.
Availability
MXD1816UR23+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and wireless sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1816UR23+ 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, computing, communications, and consumer applications.
The MXD1810–MXD1818 family delivers low-power, factory-trimmed microprocessor reset supervision for space-constrained embedded systems - optimized for reliability, minimal external components, and wide temperature operation.
FAQ
What is the exact reset threshold voltage of MXD1816UR23+ and how stable is it over temperature?
The MXD1816UR23+ has a factory-set reset threshold of 2.31V with ±2.5% accuracy over the full –40°C to +105°C operating range. This specification is guaranteed by design and production-tested per Maxim's datasheet limits, ensuring consistent brownout detection across environmental extremes without recalibration.
Does MXD1816UR23+ support manual reset via an external pushbutton?
No, MXD1816UR23+ does not include manual-reset detection or debouncing circuitry. That feature is exclusive to MXD1813 and MXD1818 variants. MXD1816UR23+ responds only to VCC supply voltage monitoring and asserts RESET solely based on the 2.31V threshold crossing.
What is the function of the internal pullup resistor in MXD1816UR23+ and what value does it have?
The MXD1816UR23+ integrates a 5.5kΩ internal pullup resistor on its open-drain RESET pin, referenced to VCC. This eliminates the need for an external pullup and enables direct interfacing with bidirectional microcontroller reset pins - such as those found on the Motorola 68HC11 - while maintaining proper logic-high idle state.
Can MXD1816UR23+ operate reliably when VCC drops below 2.0V?
Yes, MXD1816UR23+ is guaranteed to maintain valid RESET/RESET logic states down to VCC = +1.0V. Its internal comparator and timer remain functional in this range, ensuring deterministic reset behavior during deep brownout - critical for preserving system state in battery-backed applications before complete power loss.
Is MXD1816UR23+ pin-compatible with other devices in the MXD181x family?
Yes, all MXD1810–MXD1818 variants share identical 3-pin SOT23 and SC70 footprints. MXD1816UR23+ is mechanically and electrically pin-compatible with MXD1811, MXD1813, MXD1815, and others in the family - allowing drop-in replacement where reset threshold and output type match system requirements.
MXD1816UR23+ 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.31V
- 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
MXD1816UR23+ FAQ
1.How can I place an order for MXD1816UR23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816UR23+ 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 MXD1816UR23+ reliable?
The price and inventory of MXD1816UR23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816UR23+ is usually 5 days.
3.What payment methods are accepted for MXD1816UR23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816UR23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816UR23+?
MXD1816UR23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816UR23+ 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 MXD1816UR23+?
For technical support, including MXD1816UR23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816UR23+ requirements.
6.How does Aetrix verify that MXD1816UR23+ is sourced from the original manufacturer or authorized distributors?
All MXD1816UR23+ 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 MXD1816UR23+ meets industry standards.
7.What is the process for return or replacement of MXD1816UR23+?
All MXD1816UR23+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816UR23+, 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 MXD1816UR23+ part is unused and in its original packaging.
Return procedure for MXD1816UR23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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