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Analog Devices Inc./Maxim Integrated MXD1817UR26+
- Part No.:
- MXD1817UR26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1817UR26+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,630
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Product details
Overview
MXD1817UR26+ from Maxim Integrated is a low-power microprocessor reset supervisor IC with active-high push-pull RESET output, factory-set 2.55V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors +2.5V/+3.0V/+3.3V power rails in portable embedded systems and asserts reset during brownout or power-up sequencing.
For engineers reviewing the MXD1817UR26+ datasheet, MXD1817UR26+ pinout, MXD1817UR26+ application, or MXD1817UR26+ equivalent, key selection criteria include its active-high push-pull output configuration, 2.55V threshold for 2.5V/3.3V systems, manual-reset immunity (not supported), and SOT23-3 package compatibility with DS181x family designs.
Technical Context
This device integrates a precision voltage comparator, internal timer, and push-pull output driver in a single BiCMOS IC. It asserts RESET high when VCC falls below 2.55V and holds it high for ≥100ms after VCC rises above threshold - no external capacitor required.
Unlike MXD1813/MXD1818 variants, MXD1817UR26+ lacks manual-reset debounce circuitry and open-drain capability. Its RESET output remains valid down to VCC = +1V, and it rejects fast transients via built-in immunity design without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for 2.5V/3.3V systems |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | +1.0V to +5.5V - supports valid RESET assertion even during deep brownout conditions |
| Output Type | Active-high push-pull - drives µP reset pin directly without external pullup/pulldown |
| Package | SOT23-3 - footprint-compatible with industry-standard DS181x supervisory circuits |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1817UR26+ uses a 3-pin SOT23-3 package with exposed pad not electrically connected. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC (supply and threshold monitor input), Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during reset condition; sinks current when deasserted |
| 2 | VCC | Power supply input and reset-threshold reference - monitored continuously for undervoltage events |
| 3 | GND | Ground reference for internal comparator and output stage - must be low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.55V with ±2.5% accuracy over full temperature range - eliminates need for external trimming |
| No external components | Self-contained timing and detection - reduces BOM count and PCB area vs discrete solutions |
| Low quiescent current | 4µA typical - extends battery runtime in always-on monitoring applications |
| VCC = +1V operation | Guaranteed RESET logic state validity down to 1.0V supply - prevents indeterminate reset states during deep brownout |
| Transient immunity | Rejects sub-µs VCC glitches - avoids false resets caused by switching noise or ESD coupling |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters require reliable power-on reset under varying battery discharge profiles. IC Role / Device Role / Timing Role: MXD1817UR26+ monitors 3.3V rail and asserts active-high RESET to ARM Cortex-M0 MCU during startup and brownout. Use Value: 2.55V threshold aligns with 3.3V system brownout margin; 100ms timeout ensures full ADC calibration before firmware execution. |
Use Scenario: DIN-rail mounted PLC modules operate in harsh environments with wide ambient temperature swings and noisy 24VDC supplies. IC Role / Device Role / Timing Role: MXD1817UR26+ supervises isolated 3.3V logic supply derived from 24VDC, asserting RESET on undervoltage events. Use Value: -40°C to +105°C rating ensures reliability across industrial temperature range; push-pull output drives optocoupler input directly. |
| Smart Energy Meters | Wireless Sensor Nodes |
Use Scenario: ANSI C12.20-compliant electricity meters use dual-supply architectures where 3.3V logic must initialize before 5V analog sections. IC Role / Device Role / Timing Role: MXD1817UR26+ provides sequenced reset initiation for microcontroller core before analog front-end activation. Use Value: Active-high output simplifies interface with MCU reset pin; 4µA supply current minimizes self-consumption in meter standby mode. |
Use Scenario: LoRaWAN end-nodes powered by coin-cell batteries require deterministic wake-up and boot sequencing after cold start. IC Role / Device Role / Timing Role: MXD1817UR26+ monitors buck converter output (3.3V) and triggers MCU reset only when stable voltage is confirmed. Use Value: 100ms timeout accommodates slow LDO settling; 2.55V threshold prevents premature release during battery sag under load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 2.93V reset threshold, same SOT23-3 package, 140µA supply current | Higher threshold suits 3.3V systems with tighter tolerance; higher ICC limits ultra-low-power use | Select when 2.93V trip point better matches system brownout margin and power budget allows >10× higher ICC |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 1.6µA ICC, open-drain output | Requires external resistor network; open-drain necessitates pullup; lower ICC benefits battery life | Choose for flexible threshold tuning or lowest possible quiescent current; accept added component count and interface complexity |
Compared with MXD1817UR26+, MAX809TRD2+T offers higher reset voltage but consumes significantly more current, while TPS3808G125DBVR provides ultra-low ICC and adjustability at the cost of external components and open-drain drive limitations.
Availability
MXD1817UR26+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1817UR26+ 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, automotive, and communications markets, with emphasis on high-reliability, low-power solutions.
The MXD1810–MXD1818 family was engineered specifically for cost-sensitive, space-constrained microprocessor reset supervision in battery-powered and industrial embedded systems - prioritizing accuracy, low ICC, and small footprint.
FAQ
What is the reset threshold voltage of MXD1817UR26+ and how accurate is it over temperature?
The MXD1817UR26+ has a factory-trimmed reset threshold of 2.55V with ±2.5% accuracy guaranteed over the full operating temperature range of -40°C to +105°C. This specification ensures consistent brownout detection across environmental extremes without requiring external calibration. The MXD1817UR26+ achieves this using on-chip BiCMOS comparator design with temperature-compensated references.
Does MXD1817UR26+ support manual reset functionality via an external pushbutton?
No, MXD1817UR26+ does not include manual reset debounce circuitry. That feature is exclusive to MXD1813 and MXD1818 variants. MXD1817UR26+ provides only power-supply monitoring and automatic reset assertion - it lacks the internal logic to detect and debounce external button presses on the RESET pin. For manual reset capability, consider MXD1818UR26+ instead.
What is the maximum supply voltage and minimum operating voltage for MXD1817UR26+?
MXD1817UR26+ operates from VCC = +1.0V to +5.5V. Its reset comparator and output driver remain functional down to +1.0V, guaranteeing valid RESET logic states even during severe brownout conditions. This behavior is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the official Maxim datasheet for MXD1817UR26+.
Is MXD1817UR26+ pin-compatible with other devices in the MXD181x family?
Yes, MXD1817UR26+ shares identical SOT23-3 pinout with all MXD1810–MXD1818 variants, including MXD1810UR26+, MXD1815UR26+, and MXD1818UR26+. Pin 1 is RESET, Pin 2 is VCC, and Pin 3 is GND across the entire family. However, output polarity (active-high vs active-low) and features (e.g., manual reset) differ between variants - electrical compatibility requires verification per application.
What package type and RoHS status does MXD1817UR26+ use?
MXD1817UR26+ is supplied in a lead(Pb)-free 3-pin SOT23-3 package (package code U3-1), indicated by the "+" suffix in the part number. It complies with RoHS Directive 2011/65/EU and is rated for reflow soldering per JEDEC J-STD-020. The device has no exposed thermal pad, and its land pattern matches standard SOT23 footprints used for DS181x-series supervisors.
MXD1817UR26+ 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:
- 2.55V
- 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:
- SOT-23-3
MXD1817UR26+ FAQ
1.How can I place an order for MXD1817UR26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1817UR26+ 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 MXD1817UR26+ reliable?
The price and inventory of MXD1817UR26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1817UR26+ is usually 5 days.
3.What payment methods are accepted for MXD1817UR26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1817UR26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1817UR26+?
MXD1817UR26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1817UR26+ 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 MXD1817UR26+?
For technical support, including MXD1817UR26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1817UR26+ requirements.
6.How does Aetrix verify that MXD1817UR26+ is sourced from the original manufacturer or authorized distributors?
All MXD1817UR26+ 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 MXD1817UR26+ meets industry standards.
7.What is the process for return or replacement of MXD1817UR26+?
All MXD1817UR26+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1817UR26+, 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 MXD1817UR26+ part is unused and in its original packaging.
Return procedure for MXD1817UR26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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