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Analog Devices Inc./Maxim Integrated MXD1817UR23+T
- Part No.:
- MXD1817UR23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1817UR23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
MXD1817UR23+T from Maxim Integrated is a precision microprocessor reset supervisor IC with active-high push-pull RESET output, factory-set 2.31V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1V. It monitors +2.5V/+3.0V/+3.3V power rails in portable embedded systems and asserts reset during brownout, power-up, and power-down events.
For engineers reviewing the MXD1817UR23+T datasheet, MXD1817UR23+T pinout, MXD1817UR23+T application, or MXD1817UR23+T equivalent, this device delivers low-power (4μA typical) supervisory functionality in space-constrained SOT23-3 packaging with no external components required and immunity to fast VCC transients.
Technical Context
The MXD1817UR23+T integrates a precision voltage comparator with hysteresis, internal timing capacitor, and push-pull output driver. Its reset threshold is factory-trimmed to 2.31V (min 2.25V, max 2.37V) and remains stable across –40°C to +105°C with ±2.5% accuracy.
It features a fixed 100ms (min) reset timeout after VCC rises above threshold and guarantees valid RESET logic state even as VCC drops to +1V. Unlike open-drain variants, it requires no external pullup and drives high actively during reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% - precisely monitors +2.5V/+3.0V/+3.3V supplies without calibration |
| Reset Timeout Period | 100ms (min) - ensures μP completes full initialization before release |
| Supply Current | 4μA at +3.6V - enables multi-year battery life in portable equipment |
| VCC Operating Range | +1.0V to +5.5V - supports valid reset assertion down to near-undervoltage conditions |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface |
| Temperature Range | –40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
| Power Supply Immunity | Rejects transients <1.5μs at 2.31V overdrive - prevents false resets from noise or switching spikes |
Pinout & Package
MXD1817UR23+T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with industry-standard SC70-3 but with distinct pin mapping optimized for board-level density and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during reset; sinks current when released; no external pullup needed |
| 2 | VCC | Supply input and reset-threshold monitor node - powers internal circuitry and sets comparator reference |
| 3 | GND | Ground reference - forms return path for RESET sink current and stabilizes internal voltage references |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.31V ±2.5% over –40°C to +105°C - eliminates manual trimming and improves system reliability |
| No external components | Self-contained reset generator - reduces BOM count, PCB area, and qualification effort |
| Low quiescent current | 4μA typical at +3.6V - extends battery runtime in always-on monitoring applications |
| VCC = +1V reset validity | Guaranteed RESET logic state down to +1V supply - ensures deterministic behavior during deep brownout |
| Transient immunity | Immune to VCC glitches <1.5μs duration - avoids spurious resets in noisy power environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor continuously monitors heart rhythm and logs data during intermittent BLE transmission. IC Role / Device Role / Timing Role: MXD1817UR23+T supervises the +3.3V LDO powering the MCU and analog front-end, asserting active-high RESET until stable rail is confirmed post-battery insertion or wake-up. Use Value: 4μA supply current extends single-CR2032 battery life beyond 2 years; 2.31V threshold matches nominal Li-ion discharge curve for graceful shutdown before data corruption. |
Use Scenario: DIN-rail mounted PLC module controls solenoid valves in factory automation, requiring fail-safe restart after AC line interruption. IC Role / Device Role / Timing Role: MXD1817UR23+T monitors the +2.5V isolated DC-DC output feeding the safety-critical watchdog timer and communication interface. Use Value: 100ms reset timeout ensures complete firmware reload and hardware initialization; –40°C to +105°C rating supports uncooled cabinet deployment. |
| Smart Energy Meters | Automotive Infotainment Head Units |
Use Scenario: Revenue-grade electricity meter operates from split-phase AC via wide-input buck converter, with backup supercapacitor hold-up. IC Role / Device Role / Timing Role: MXD1817UR23+T watches the +3.3V system rail and triggers active-high RESET on brownout, preventing EEPROM write corruption during capacitor discharge. Use Value: Valid RESET down to VCC = +1V ensures reset remains asserted until supercapacitor falls below safe write voltage; ±2.5% threshold tolerance meets ANSI C12.20 accuracy requirements. |
Use Scenario: In-vehicle infotainment unit powered by automotive 12V battery with wide transient range (–0.5V to +40V) and cold-crank dips. IC Role / Device Role / Timing Role: MXD1817UR23+T supervises the +3.3V PMIC output feeding the application processor, asserting RESET during cranking-induced undervoltage. Use Value: Immunity to sub-2μs transients prevents false resets during load-dump or alternator switching; SOT23-3 footprint fits tight layout constraints near processor BGA. |
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, open-drain active-low output, 140ms timeout, 1.2μA ICC | Requires external pullup; higher threshold unsuitable for +2.5V systems; lower current benefits ultra-low-power sleep modes | Select when interfacing with bidirectional μP reset pins or when 2.93V threshold aligns with +3.3V rail margin |
| TPS3808G125DBVR | 1.25V threshold, push-pull active-low output, adjustable timeout (200ms default), 1.1μA ICC | Lower threshold targets core voltage monitoring; active-low polarity requires logic inversion in some MCU interfaces | Choose for SoC core-voltage supervision or when programmable timeout adds design flexibility |
Compared with MXD1817UR23+T, MAX809TRD2+T offers lower supply current but lacks push-pull drive and precise 2.31V matching for +2.5V systems, while TPS3808G125DBVR provides adjustable timing but requires level-shifting for active-high MCU interfaces and does not guarantee reset validity below +1.2V.
Availability
MXD1817UR23+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1817UR23+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, computing, and consumer applications, emphasizing high reliability and low power.
The MXD1810–MXD1818 family was engineered specifically for cost-sensitive, space-constrained microprocessor reset supervision in battery-powered and industrial embedded systems, prioritizing zero external components and guaranteed operation across harsh thermal environments.
FAQ
What is the exact reset threshold voltage of MXD1817UR23+T and how tightly is it specified?
The MXD1817UR23+T has a factory-set reset threshold of 2.31V, with guaranteed limits of 2.25V (min) and 2.37V (max) over the full –40°C to +105°C temperature range. This ±2.5% accuracy is specified in the Electrical Characteristics table and applies across all operating conditions without derating.
Does MXD1817UR23+T support manual reset via an external pushbutton?
No - MXD1817UR23+T does not include manual reset detection. That feature is exclusive to the MXD1813/MXD1818 variants. MXD1817UR23+T provides only power-supply monitoring and automatic reset assertion; external reset initiation requires separate circuitry or a different part number.
What is the maximum supply voltage the MXD1817UR23+T can withstand on its VCC pin?
The absolute maximum VCC rating for MXD1817UR23+T is +6.0V, but its functional operating range is +1.0V to +5.5V. Operation above +5.5V risks permanent damage, and sustained operation at +6.0V is not permitted per Absolute Maximum Ratings.
Can MXD1817UR23+T be used with a +2.5V power supply, and what is its behavior near the lower end of VCC?
Yes - MXD1817UR23+T is explicitly designed for +2.5V systems and guarantees correct RESET/RESET logic state down to VCC = +1.0V. At VCC = +1.0V, the active-high RESET output remains valid and driven, ensuring deterministic behavior during deep brownout recovery.
Is MXD1817UR23+T pin-compatible with other devices in the MXD181x family?
Yes - all MXD181x devices in SOT23-3 packaging share identical pinout: Pin 1 = RESET, Pin 2 = VCC, Pin 3 = GND. This allows direct substitution within the same package type when reset threshold and output polarity match system requirements.
MXD1817UR23+T 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:
- 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
MXD1817UR23+T FAQ
1.How can I place an order for MXD1817UR23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1817UR23+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 MXD1817UR23+T reliable?
The price and inventory of MXD1817UR23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1817UR23+T is usually 5 days.
3.What payment methods are accepted for MXD1817UR23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1817UR23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1817UR23+T?
MXD1817UR23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1817UR23+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 MXD1817UR23+T?
For technical support, including MXD1817UR23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1817UR23+T requirements.
6.How does Aetrix verify that MXD1817UR23+T is sourced from the original manufacturer or authorized distributors?
All MXD1817UR23+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 MXD1817UR23+T meets industry standards.
7.What is the process for return or replacement of MXD1817UR23+T?
All MXD1817UR23+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1817UR23+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 MXD1817UR23+T part is unused and in its original packaging.
Return procedure for MXD1817UR23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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