My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MXD1811UR46+T
- Part No.:
- MXD1811UR46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1811UR46+T.pdf
- Description:
- IC MPU RESET CIRC 4.62V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MXD1811UR46+T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC for +5V systems, featuring a factory-set 4.62V reset threshold, 100ms minimum reset timeout, internal 5.5kΩ pullup resistor, and operation down to VCC = +1V. It monitors supply voltage integrity in embedded controllers and portable equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MXD1811UR46+T datasheet, MXD1811UR46+T pinout, MXD1811UR46+T application, or MXD1811UR46+T equivalent, key selection criteria include reset threshold accuracy (±2.5%), low quiescent current (4µA), SOT23-3 package compatibility, and open-drain output suitability for bidirectional µP reset pins.
Technical Context
The MXD1811UR46+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 4.62V, asserting RESET low within 5µs. Its internal timer guarantees ≥100ms reset assertion after VCC recovers, independent of supply ramp rate.
This device uses BiCMOS process technology and includes transient immunity circuitry that rejects negative-going VCC glitches up to 70µs when overdriven by 20mV - critical for noisy industrial power rails. It does not support manual reset detection (unlike MXD1813/MXD1818).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.62V ±2.5% - ensures reliable reset initiation at nominal +5V supply before brownout affects µP operation |
| Reset Timeout Period | 100ms min - provides sufficient hold time for µP initialization and peripheral stabilization |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in portable applications |
| Operating Voltage Range | +1.0V to +5.5V - guarantees valid RESET output even during deep brownout conditions |
| Output Type | Open-drain, active-low - allows wired-OR configuration and direct interface with bidirectional µP reset pins |
| Internal Pullup | 5.5kΩ to VCC - eliminates need for external pullup resistor in most designs |
| Temperature Range | -40°C to +105°C - supports industrial and automotive under-hood environments |
Pinout & Package
MXD1811UR46+T is housed in a 3-pin SOT23 package (U3-1 outline), footprint-compatible with industry-standard reset supervisors. The compact 2.92mm × 1.3mm body enables high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Drives low when VCC < 4.62V; floats high via internal 5.5kΩ pullup; sinks ≥10mA when asserted |
| 2 (VCC) | Supply voltage input & reset threshold reference | Monitors system rail directly; powers internal comparator and timer; valid down to +1.0V |
| 3 (GND) | Ground reference | Return path for reset sink current and internal circuitry; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.62V with ±2.5% tolerance over -40°C to +105°C - eliminates calibration and improves system reliability |
| No external components required | Self-contained reset generation with internal pullup and timing capacitor - reduces BOM count and board area |
| Power-supply transient immunity | Rejects VCC glitches ≤70µs duration - prevents spurious resets in electrically noisy environments |
| Low-power operation | 4µA typical supply current - extends battery life in portable instrumentation and IoT edge nodes |
| Guaranteed logic state to VCC = +1V | Valid RESET output maintained during deep undervoltage - ensures deterministic µP behavior during shutdown |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Power-up sequencing and brownout recovery in industrial PLCs and programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory reset generator that asserts active-low RESET until +5V rail stabilizes above 4.62V and holds for ≥100ms. Use Value: Prevents firmware execution errors during unstable power conditions, ensuring deterministic boot behavior without external RC networks. | Use Scenario: Battery-powered handheld test meters with strict low-power requirements. IC Role / Device Role / Timing Role: Low-quiescent-current (4µA) reset supervisor monitoring main +5V supply derived from DC-DC converter. Use Value: Enables multi-year operation on coin-cell batteries while maintaining guaranteed reset validity down to VCC = +1V. |
| Set-Top Boxes | Printers |
Use Scenario: Cold-start and hot-swap resilience in digital media receivers with multiple voltage rails. IC Role / Device Role / Timing Role: Open-drain RESET output interfacing with bidirectional µP reset pin (e.g., ARM Cortex-M series) via shared bus. Use Value: Eliminates need for external pullup resistor and supports system-level reset arbitration with other peripherals. | Use Scenario: Power-rail monitoring in multifunction printers with motor drivers and USB interfaces. IC Role / Device Role / Timing Role: Precision 4.62V threshold detection on main +5V logic rail to prevent corrupted print jobs during line-voltage sags. Use Value: Reduces field failures caused by marginal supply conditions, improving MTBF in high-volume consumer devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR46+T | Same 4.62V threshold, 100ms timeout, SOT23-3, but features push-pull output instead of open-drain | Requires external pullup if interfacing with bidirectional µP reset pins; higher drive strength (20mA sink) | Select when higher output current or push-pull logic compatibility is required |
| TPS3808G33DBVR | 3.3V reset threshold (not 4.62V); adjustable delay option; 1.5µA typical ICC; same SOT23-3 package | Designed for +3.3V systems only; lacks internal pullup; requires external timing capacitor for delay adjustment | Select for ultra-low-power +3.3V applications where 4.62V threshold is not needed |
Compared with MXD1811UR46+T, MAX6326UR46+T offers stronger push-pull drive but loses open-drain flexibility, while TPS3808G33DBVR targets lower-voltage systems with superior quiescent current but requires external components and lacks the precise 4.62V threshold.
Availability
MXD1811UR46+T is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, set-top boxes, and printers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1811UR46+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 computing applications, with emphasis on power management and sensor interface solutions.
The MXD181x family delivers low-power, factory-trimmed reset supervision for microprocessor-based systems, targeting cost-sensitive, space-constrained designs needing guaranteed reset timing and supply noise immunity.
FAQ
What is the exact reset threshold voltage of MXD1811UR46+T and how tightly is it specified?
The MXD1811UR46+T has a factory-set reset threshold of 4.62V, with a guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix R46. The device maintains this accuracy without external calibration, making it suitable for applications demanding precise brownout detection in +5V systems.
Does MXD1811UR46+T support manual reset functionality via an external pushbutton?
No, MXD1811UR46+T does not support manual reset detection. That feature is exclusive to the MXD1813 and MXD1818 variants, which include debounced logic to assert reset upon a >1.5µs low pulse on the RESET pin. MXD1811UR46+T is a basic voltage-monitoring supervisor with automatic reset only - its RESET pin serves solely as an open-drain output, not an input for manual intervention.
What is the purpose of the internal 5.5kΩ pullup resistor in MXD1811UR46+T?
The internal 5.5kΩ pullup resistor connects the open-drain RESET output to VCC, ensuring the pin defaults to a logic-high state when not actively driven low. This eliminates the need for an external pullup resistor in most designs, reducing component count and PCB area. It enables direct connection to bidirectional µP reset pins (e.g., Motorola 68HC11) and supports wired-OR reset bus configurations without additional discrete parts.
Can MXD1811UR46+T operate reliably when VCC drops below 2.0V?
Yes, MXD1811UR46+T is guaranteed to maintain valid RESET logic states down to VCC = +1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics sections. While the reset threshold (4.62V) is exceeded well before that point, the internal comparator and output stage remain functional - ensuring predictable behavior during deep brownout or controlled shutdown sequences, unlike many competitors that fail below 1.8V.
Is MXD1811UR46+T pin-compatible with other common reset ICs like the DS1813?
Yes, MXD1811UR46+T is explicitly noted as pin-compatible with DS181x-series products in the SOT23-3 package. Pin 1 is RESET (open-drain), Pin 2 is VCC, and Pin 3 is GND - matching the standard 3-pin supervisory IC layout. This allows drop-in replacement in existing designs using DS1813 or similar Maxim/Analog Devices reset supervisors, provided the 4.62V threshold and open-drain output meet system requirements.
MXD1811UR46+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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.62V
- 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
MXD1811UR46+T FAQ
1.How can I place an order for MXD1811UR46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1811UR46+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 MXD1811UR46+T reliable?
The price and inventory of MXD1811UR46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1811UR46+T is usually 5 days.
3.What payment methods are accepted for MXD1811UR46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1811UR46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1811UR46+T?
MXD1811UR46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1811UR46+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 MXD1811UR46+T?
For technical support, including MXD1811UR46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1811UR46+T requirements.
6.How does Aetrix verify that MXD1811UR46+T is sourced from the original manufacturer or authorized distributors?
All MXD1811UR46+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 MXD1811UR46+T meets industry standards.
7.What is the process for return or replacement of MXD1811UR46+T?
All MXD1811UR46+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1811UR46+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 MXD1811UR46+T part is unused and in its original packaging.
Return procedure for MXD1811UR46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1811UR46+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…
