My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MXD1818UR29+T
- Part No.:
- MXD1818UR29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:455
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MXD1818UR29+T from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain active-low RESET output and debounced manual-reset capability. It monitors +2.5V/+3.0V/+3.3V supplies, asserts reset when VCC falls below 2.88V (±2.5%), holds reset for ≥100ms after VCC recovery or manual trigger, and operates from -40°C to +105°C in SOT23-3 package - used in portable battery-powered controllers and set-top boxes.
For engineers reviewing the MXD1818UR29+T datasheet, MXD1818UR29+T pinout, MXD1818UR29+T application, or MXD1818UR29+T equivalent, key selection criteria include its 2.88V factory-trimmed threshold, 100ms minimum timeout, internal 5.5kΩ pullup resistor, manual-reset debounce timing (1.5μs minimum low pulse), and guaranteed RESET validity down to VCC = +1V.
Technical Context
The MXD1818UR29+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 by requiring ≥1.5μs low pulse duration before initiating the reset period.
This device uses BiCMOS process technology to achieve 4μA typical supply current and transient immunity against negative-going VCC glitches up to 100μs (at 200mV overdrive). It guarantees valid RESET output state down to VCC = +1V and supports bidirectional μP reset interfaces without external pullup components.
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 supply sag |
| Reset Timeout Period | 100ms min - provides sufficient hold time for μP initialization during power-up or recovery |
| Supply Current | 4μA typ at +3.6V - enables ultra-low-power operation in battery-backed applications |
| Operating Temp Range | -40°C to +105°C - supports industrial and extended-temperature embedded deployments |
| Manual Reset Detect | 1.5μs minimum low pulse - rejects switch bounce while enabling robust push-button initiation |
| Internal Pullup Resistor | 5.5kΩ - eliminates need for external pullup when interfacing with bidirectional μP reset pins |
| VCC Validity Limit | +1V - guarantees defined RESET logic state even during deep brownout conditions |
Pinout & Package
MXD1818UR29+T is housed in a 3-pin SOT23-3 package (outline U3-1), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 is RESET (open-drain active-low), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Drives low during reset; pulled high internally via 5.5kΩ resistor to VCC; compatible with bidirectional μP reset pins |
| 2 (VCC) | Power supply input and reset threshold reference | Monitors system supply directly; comparator input referenced to internal bandgap; supports operation down to +1V |
| 3 (GND) | Ground reference | Common return path for supply and reset logic; must be low-impedance for accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.88V threshold | Eliminates external resistor network and calibration effort for +3.3V system monitoring |
| Debounced manual-reset input | Enables direct connection to mechanical pushbuttons without external RC filtering or firmware debounce |
| 100ms fixed reset timeout | Guarantees μP reset hold time meets boot ROM requirements across temperature and voltage extremes |
| Internal 5.5kΩ pullup resistor | Reduces BOM count and PCB area; supports I²C-style shared reset bus architectures |
| 4μA supply current | Extends battery life in portable instrumentation and remote sensors operating on coin cells or energy harvesters |
Applications
| Portable Medical Sensors | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters and ECG patch monitors require reliable power-on reset and user-initiated recalibration. IC Role / Device Role / Timing Role: MXD1818UR29+T provides active-low reset assertion during cold start and debounced manual reset for field recalibration. Use Value: Guarantees deterministic μP startup under varying battery voltage (2.8–3.6V) and eliminates false triggers from tactile switch bounce. |
Use Scenario: Programmable logic controllers in factory automation must survive voltage sags and enable operator-triggered system restarts. IC Role / Device Role / Timing Role: MXD1818UR29+T monitors 3.3V I/O rail and asserts reset on brownout; RESET pin accepts front-panel pushbutton input. Use Value: 2.88V threshold aligns with 3.3V system margin; 100ms timeout satisfies PLC bootloader timing; internal pullup avoids external component. |
| Set-Top Box Power Management | Smart Meter MCU Supervision |
Use Scenario: Consumer STBs use 3.3V SoCs that require clean reset during AC power cycling and IR-remote-initiated reboot. IC Role / Device Role / Timing Role: MXD1818UR29+T supervises main 3.3V rail and interfaces with IR receiver's reset-enable signal via open-drain RESET. Use Value: Open-drain output allows wired-OR with other reset sources; 4μA quiescent current minimizes standby power draw. |
Use Scenario: AMI smart meters operate unattended for years on lithium-thionyl chloride batteries and must recover from grid-induced brownouts. IC Role / Device Role / Timing Role: MXD1818UR29+T monitors backup 3.3V supply and provides reset hold time compliant with metering SoC specifications. Use Value: Valid RESET output down to VCC = +1V ensures reset integrity during deep discharge; ±2.5% threshold accuracy maintains long-term reliability. |
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, 140ms timeout, same SOT23-3 package, no manual reset detect | Lacks debounced pushbutton support; suitable only where manual reset is handled externally or not required | Select when 2.93V threshold better matches system margin and manual reset is unnecessary |
| TPS3808G33DBVR | 3.08V threshold, adjustable timeout (1ms–10s), 1.5μA supply current, SOT23-6 package | Requires external capacitor for timeout setting; larger footprint; lower power but higher design complexity | Select when programmable timeout or sub-μA quiescent current is critical and board space permits 6-pin layout |
Compared with MXD1818UR29+T, MAX809TRD2+T offers tighter threshold tolerance but omits manual-reset debounce, while TPS3808G33DBVR trades simplicity and footprint for configurability and ultra-low power - making MXD1818UR29+T optimal for cost-sensitive, space-constrained 3.3V systems needing integrated pushbutton support.
Availability
MXD1818UR29+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC controllers, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1818UR29+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, with emphasis on power management and sensor interface solutions.
The MXD1810–MXD1818 family was engineered specifically for low-cost, space-constrained microprocessor reset supervision in battery-powered and industrial embedded systems - prioritizing guaranteed timing, threshold accuracy, and integration of manual-reset debounce.
FAQ
What is the exact reset threshold voltage of MXD1818UR29+T?
The MXD1818UR29+T has a factory-set reset threshold of 2.88V with ±2.5% accuracy over the full -40°C to +105°C temperature range. This value is trimmed during production and specified in the Electrical Characteristics table under "MXD181_ _ R29" entry. The "R29" suffix in the part number explicitly denotes the 2.88V threshold variant.
Does MXD1818UR29+T support manual reset, and how does it work?
Yes, MXD1818UR29+T includes debounced manual-reset detection on its RESET pin. When the RESET pin is pulled low for ≥1.5μs, the device asserts its own RESET output for ≥100ms after release. This internal logic eliminates external RC filters and prevents false triggers from mechanical switch bounce - a feature confirmed in the Functional Diagram and Detailed Description sections.
What package type and pin configuration does MXD1818UR29+T use?
MXD1818UR29+T uses the 3-pin SOT23-3 package (outline U3-1), with Pin 1 as open-drain RESET, Pin 2 as VCC, and Pin 3 as GND. This is explicitly shown in the "Pin Configurations" diagram and confirmed in the Ordering Information table where "UR" denotes SOT23 packaging.
Is an external pullup resistor required for MXD1818UR29+T's RESET output?
No, MXD1818UR29+T includes an internal 5.5kΩ pullup resistor to VCC on its open-drain RESET output. This is documented in the "Electrical Characteristics" table under "Internal Pullup Resistor" and verified in the Pin Descriptions section for MXD1813/MXD1818 variants - eliminating the need for external components in most bidirectional reset interface applications.
What is the minimum supply voltage at which MXD1818UR29+T guarantees valid RESET output?
MXD1818UR29+T guarantees correct RESET/RESET logic state down to VCC = +1V, as stated in the General Description and Absolute Maximum Ratings sections. This ensures deterministic reset behavior during deep brownout conditions where many competing supervisors fail to maintain defined output states.
MXD1818UR29+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:
- 2.88V
- Output:
- Open Drain, Bidirectional
- 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
MXD1818UR29+T FAQ
1.How can I place an order for MXD1818UR29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR29+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 MXD1818UR29+T reliable?
The price and inventory of MXD1818UR29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR29+T is usually 5 days.
3.What payment methods are accepted for MXD1818UR29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR29+T?
MXD1818UR29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR29+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 MXD1818UR29+T?
For technical support, including MXD1818UR29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR29+T requirements.
6.How does Aetrix verify that MXD1818UR29+T is sourced from the original manufacturer or authorized distributors?
All MXD1818UR29+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 MXD1818UR29+T meets industry standards.
7.What is the process for return or replacement of MXD1818UR29+T?
All MXD1818UR29+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR29+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 MXD1818UR29+T part is unused and in its original packaging.
Return procedure for MXD1818UR29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1818UR29+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
