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Analog Devices Inc./Maxim Integrated MXD1818XR29+T
- Part No.:
- MXD1818XR29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1818XR29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,386
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Product details
Overview
MXD1818XR29+T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC with manual-reset debouncing, designed for +2.5V/+3.0V/+3.3V systems. It asserts reset when VCC falls below 2.88V (±2.5%), maintains reset for ≥100ms after VCC recovery or manual trigger release, and features internal 5.5kΩ pullup, 4μA supply current, and operation from -40°C to +105°C - ideal for battery-powered portable instrumentation.
For engineers reviewing the MXD1818XR29+T datasheet, MXD1818XR29+T pinout, MXD1818XR29+T application, or MXD1818XR29+T equivalent, key selection criteria include its 2.88V factory-trimmed threshold, SC70-3 package compatibility, debounced push-button reset capability (≥1.5μs low pulse), and guaranteed RESET validity down to VCC = +1V.
Technical Context
The MXD1818XR29+T implements a precision voltage comparator with hysteresis-free threshold detection at 2.88V, coupled to a fixed 100ms reset timeout timer triggered on VCC rise or external RESET pin assertion. Its internal debouncing logic filters mechanical switch bounce before initiating the 100ms minimum reset period.
This device uses BiCMOS process technology to achieve 4μA quiescent current and transient immunity against negative-going VCC glitches up to 100μs (at 200mV overdrive), while maintaining ±2.5% threshold accuracy across -40°C to +105°C and supporting valid reset output down to VCC = +1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.88V ±2.5% - ensures reliable brownout detection for 3.3V systems with margin against noise-induced false triggers |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power recovery or manual reset |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable equipment without external power management |
| VCC Operating Range | +1.2V to +5.5V - supports valid reset assertion even during deep brownout conditions down to 1.2V |
| Manual Reset Detect | 1.5μs minimum low pulse on RESET pin - rejects switch bounce while enabling fast, deterministic user-initiated reset |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup - simplifies interface to bidirectional μP reset pins without external components |
| Package | 3-pin SC70 - footprint-compatible with SOT23 but 30% smaller, reducing PCB area in space-constrained designs |
Pinout & Package
MXD1818XR29+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm × 0.9mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SC70) / 2 (SOT23) | RESET | Open-drain active-low output with internal 5.5kΩ pullup to VCC; accepts manual reset pulses ≥1.5μs and asserts reset for ≥100ms after release |
| 2 (SC70) / 1 (SOT23) | VCC | Power supply input and reset threshold monitoring node; operates from +1.2V to +5.5V and tolerates transients per spec |
| 3 | GND | Ground reference for comparator, timer, and output stage; must be low-impedance to ensure accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.88V threshold | Eliminates external resistor networks and calibration, reducing BOM count and assembly cost in 3.3V systems |
| Debounced manual reset | Internal logic removes need for external RC filters or firmware debounce, simplifying hardware and software design |
| 100ms fixed reset timeout | Guarantees μP reset hold time meets JEDEC JESD78 requirements without external timing capacitors |
| 4μA supply current | Enables always-on supervision in energy-harvesting or coin-cell-powered devices without compromising runtime |
| SC70-3 package | Reduces board area by ~30% vs. SOT23-3, critical for wearable sensors and compact IoT endpoints |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch continuously monitors heart rhythm using ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: MXD1818XR29+T supervises 3.3V rail and provides debounced user reset via tactile button. Use Value: 4μA quiescent current extends battery life beyond 12 months; 2.88V threshold prevents spurious resets during Li-ion discharge curve tail. |
Use Scenario: DIN-rail mounted PLC module powers field sensors and communicates via RS-485 under variable industrial supply conditions. IC Role / Device Role / Timing Role: MXD1818XR29+T detects brownout on 3.3V logic rail and initiates controlled shutdown sequence. Use Value: ±2.5% threshold accuracy over -40°C to +105°C ensures reliable operation in uncontrolled cabinet environments. |
| Smart Home Hub Controllers | Handheld Test Equipment |
|
Use Scenario: Wi-Fi-enabled home automation hub integrates Zigbee/Thread radios and runs real-time OS on ARM Cortex-M. IC Role / Device Role / Timing Role: MXD1818XR29+T provides power-on reset and user-triggered recovery via front-panel button. Use Value: Internal 5.5kΩ pullup eliminates external resistor, saving PCB space and assembly steps in high-volume consumer production. |
Use Scenario: Battery-powered multimeter with LCD display and precision ADC requires deterministic startup after battery insertion or button press. IC Role / Device Role / Timing Role: MXD1818XR29+T asserts reset until 3.3V rail stabilizes and debounces mechanical keypad actuation. Use Value: Valid RESET output down to VCC = +1V ensures robust behavior during partial battery depletion or cold-temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.93V threshold, SOT23-3, no manual reset detect | Lacks debounced push-button functionality; requires external RC for manual reset | Choose when only basic power-supply monitoring is needed and board space allows SOT23 |
| TPS3808G33DBVR | 3.3V threshold, adjustable timeout (200ms default), SOT23-6 | Higher pin count, no integrated manual reset; requires external capacitor for timeout tuning | Prefer when longer reset duration or tighter threshold tolerance (±0.5%) is required |
Compared with MAX809TRD3+T and TPS3808G33DBVR, MXD1818XR29+T uniquely combines factory-trimmed 2.88V threshold, SC70 footprint, and integrated debounced manual reset - delivering lower system-level BOM cost and smaller PCB area for portable 3.3V applications requiring user-initiated recovery.
Availability
MXD1818XR29+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and handheld test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1818XR29+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 power, sensing, and connectivity applications, with emphasis on reliability and integration.
The MXD1810–MXD1818 family was engineered specifically for low-power microprocessor supervision in space-constrained, battery-operated systems - prioritizing ultra-low ICC, small footprint, and factory-trimmed thresholds to eliminate calibration overhead.
FAQ
What is the exact reset threshold voltage of MXD1818XR29+T and how is it trimmed?
The MXD1818XR29+T has a factory-trimmed reset threshold of 2.88V with ±2.5% accuracy over -40°C to +105°C. This value is laser-trimmed during wafer sort and verified per Electrical Characteristics table in the datasheet; no external adjustment is possible or required. The "R29" suffix explicitly denotes this 2.88V variant within the MXD1815–MXD1818 series.
Does MXD1818XR29+T require an external pullup resistor on the RESET pin?
No, MXD1818XR29+T includes an internal 5.5kΩ pullup resistor to VCC on its open-drain RESET output, eliminating the need for external components. This is confirmed in the Pin Descriptions section and Electrical Characteristics table (RP = 3.1–7.5kΩ for MXD1813/MXD1818). External pullups may cause contention and are not recommended.
How does the manual reset function work on MXD1818XR29+T?
MXD1818XR29+T detects a logic-low signal on its RESET pin lasting ≥1.5μs, then asserts active-low reset for ≥100ms after the pin is released. Its internal debouncing circuitry filters mechanical switch bounce, ensuring a single, clean reset pulse without firmware or external hardware intervention - a feature exclusive to MXD1813/MXD1818 variants.
Can MXD1818XR29+T operate reliably at VCC = +1.2V?
Yes, MXD1818XR29+T is guaranteed to assert and maintain a valid RESET output down to VCC = +1.2V (minimum operating voltage per Absolute Maximum Ratings), and its reset comparator remains functional down to +1.0V. This enables robust brownout detection in deeply discharged battery scenarios where other supervisors fail.
What is the package type and footprint compatibility of MXD1818XR29+T?
MXD1818XR29+T uses a 3-pin SC70 package (X3-2 outline, land pattern 90-0208), measuring 2.0mm × 1.25mm. While pin-compatible with SOT23-3 in function (VCC, GND, RESET), it is not footprint-compatible - SC70 has narrower lead pitch (0.65mm vs. 0.95mm) and different pad layout, requiring dedicated PCB land patterns.
MXD1818XR29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.88V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MXD1818XR29+T FAQ
1.How can I place an order for MXD1818XR29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818XR29+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 MXD1818XR29+T reliable?
The price and inventory of MXD1818XR29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818XR29+T is usually 5 days.
3.What payment methods are accepted for MXD1818XR29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818XR29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818XR29+T?
MXD1818XR29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818XR29+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 MXD1818XR29+T?
For technical support, including MXD1818XR29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818XR29+T requirements.
6.How does Aetrix verify that MXD1818XR29+T is sourced from the original manufacturer or authorized distributors?
All MXD1818XR29+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 MXD1818XR29+T meets industry standards.
7.What is the process for return or replacement of MXD1818XR29+T?
All MXD1818XR29+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818XR29+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 MXD1818XR29+T part is unused and in its original packaging.
Return procedure for MXD1818XR29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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