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Analog Devices Inc./Maxim Integrated MXD1812UR41
- Part No.:
- MXD1812UR41
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1812UR41.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
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Product details
Overview
MXD1812UR41 from Maxim Integrated is a precision microprocessor reset supervisor IC designed for +5V digital systems. It provides active-high push-pull RESET output, 4.12V ±2.5% factory-trimmed reset threshold, 100ms minimum reset timeout, and operates from -40°C to +105°C in SOT23-3 package - used to ensure reliable power-up sequencing in embedded controllers and portable equipment.
For engineers reviewing the MXD1812UR41 datasheet, MXD1812UR41 pinout, MXD1812UR41 application, or MXD1812UR41 equivalent, key selection criteria include reset polarity (active-high), VCC monitoring range (1.0V–5.5V), guaranteed RESET validity down to VCC = +1V, manual-reset absence (vs. MXD1813/MXD1818), and compatibility with 5V μP reset inputs requiring clean high-level assertion during brownout recovery.
Technical Context
The MXD1812UR41 implements a precision bandgap-based voltage comparator with hysteresis to monitor VCC against its 4.12V threshold, asserting RESET when VCC falls below that level and holding it high for ≥100ms after VCC recovers. Its push-pull output drives directly into CMOS/TTL reset inputs without external pullup.
No manual-reset input is supported - unlike MXD1813/MXD1818 - and no internal debouncing circuitry is present. The device guarantees correct logic state for VCC as low as +1V and rejects transients ≤2µs at 4.12V overdrive, enabling robust operation in noisy 5V supply environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.12V ±2.5% - precisely triggers reset during 5V supply brownout at defined voltage margin |
| Reset Timeout | 100ms (min) - ensures μP remains held in reset long enough for stable clock and supply recovery |
| Supply Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout down to 1V |
| Supply Current | 4µA (typ @ 3.6V) - enables use in battery-powered systems with minimal quiescent load |
| Output Type | Active-high push-pull - eliminates need for external pullup and drives high-impedance μP reset pins directly |
| Operating Temp | -40°C to +105°C - qualified for industrial and automotive under-hood applications |
| VCC Transient Immunity | Rejects <2µs negative glitches at 4.12V overdrive - prevents false resets in electrically noisy environments |
Pinout & Package
MXD1812UR41 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with industry-standard 5V reset supervisors. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC (supply and threshold reference input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - asserts high during reset condition; sinks current when low, sources when high |
| 2 | VCC | Power supply input and reset threshold reference - monitored continuously; powers internal comparator and timer |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.12V reset threshold | Factory-trimmed ±2.5% over -40°C to +105°C - eliminates calibration and ensures consistent 5V system brownout response |
| Active-high push-pull RESET | Direct interface to μP reset pins requiring high-level assertion - no external components needed |
| 100ms fixed reset timeout | Guaranteed minimum delay ensures full power and clock stabilization before release |
| Low 4µA supply current | Enables always-on supervision in energy-constrained portable and IoT edge devices |
| VCC = +1V RESET validity | Maintains defined logic state down to near-exhaustion of backup power - critical for graceful shutdown |
Applications
| Industrial PLC Controllers | 5V Embedded Microcontrollers |
|---|---|
Use Scenario: Power monitoring in programmable logic controllers operating from unregulated 5V rails subject to line sag and switching noise. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to hold CPU in known state until 5V rail stabilizes post-brownout. Use Value: Prevents firmware corruption by guaranteeing ≥100ms reset hold time and rejecting sub-2µs supply transients. |
Use Scenario: Reset coordination in compact 5V MCU-based sensor nodes where board space and BOM count are constrained. IC Role / Device Role / Timing Role: Single-chip reset generator with push-pull output eliminating external pullup resistor and reducing component count. Use Value: Saves PCB area via SOT23-3 package and reduces assembly cost with zero external components required. |
| Point-of-Sale Terminals | Network Interface Cards (NICs) |
Use Scenario: Reliable boot initialization in retail terminals powered from shared 5V DC supplies prone to momentary dips during peripheral insertion. IC Role / Device Role / Timing Role: Voltage supervisor ensuring μP does not execute code until 5V rail exceeds 4.12V and remains stable for ≥100ms. Use Value: Eliminates boot failures caused by marginal 5V supply conditions using precision threshold and temperature-stable timing. |
Use Scenario: Reset management in PCIe/USB NICs where host-side reset signaling must align with local 5V power integrity. IC Role / Device Role / Timing Role: Synchronizing NIC FPGA or PHY reset to 5V rail recovery, with active-high output compatible with standard logic interfaces. Use Value: Ensures deterministic link training by enforcing strict 100ms minimum reset assertion after power recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR41D3T | Same 4.12V threshold, active-low open-drain output, 14µA ICC, requires external pullup | Requires pullup resistor; incompatible with μP reset pins expecting active-high signal | Select only if system design accommodates active-low reset and external biasing |
| TPS3808G33DBVR | 3.3V threshold (not 4.12V), adjustable timeout, 1.6µA ICC, active-low push-pull | Incorrect threshold for 5V systems; mismatched voltage domain and polarity | Not suitable for direct replacement; consider only for new 3.3V designs with flexible reset requirements |
Compared with MXD1812UR41, MAX809TR41D3T offers identical threshold accuracy but mandates external pullup and active-low logic, increasing BOM and limiting μP compatibility; TPS3808G33DBVR targets 3.3V systems and cannot supervise 5V rails without external resistive divider - neither provides the precise 4.12V active-high reset capability of MXD1812UR41 in a drop-in SOT23-3 form factor.
Availability
MXD1812UR41 is available at Aetrix Electronics and suitable for industrial PLC controllers, 5V embedded microcontrollers, point-of-sale terminals, and network interface cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1812UR41 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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MXD1810–MXD1818 family was designed to deliver low-power, precision reset supervision for 5V and 3.3V microprocessor systems - emphasizing factory-trimmed thresholds, wide temperature operation, and minimal external component count.
FAQ
What is the reset threshold voltage of the MXD1812UR41?
The MXD1812UR41 has a factory-set reset threshold of 4.12V with ±2.5% accuracy over the full -40°C to +105°C temperature range. This value is specified in the Electrical Characteristics table under "MXD181_ _ R41" and applies directly to the MXD1812UR41 variant. The threshold is trimmed during production and does not require external adjustment.
Does the MXD1812UR41 support manual reset functionality?
No, the MXD1812UR41 does not include manual reset capability. Unlike the MXD1813/MXD1818 variants, it lacks debounced push-button detection circuitry and does not respond to external signals on the RESET pin. Its reset assertion is solely triggered by VCC falling below 4.12V, followed by a 100ms minimum timeout upon recovery.
What package type is used for the MXD1812UR41?
The MXD1812UR41 is supplied in a 3-pin SOT23-3 package (JEDEC MO-178AA), with pin 1 = RESET (active-high), pin 2 = VCC, and pin 3 = GND. This package is RoHS-compliant, tape-and-reel packaged in 2500-unit reels, and shares footprint compatibility with other members of the MXD181x family and legacy DS181x devices.
Can the MXD1812UR41 operate with supply voltages below 5V?
Yes, the MXD1812UR41 operates from VCC = 1.0V to 5.5V. Its internal comparator and timer remain functional down to 1.0V, and the RESET output maintains valid logic levels (high/low) throughout this range. This enables use in brownout scenarios and battery-backed systems where VCC may dip significantly before shutdown.
Is the MXD1812UR41 pin-compatible with other reset ICs?
The MXD1812UR41 is pin-compatible with the DS181x series (e.g., DS1812R-41) in SOT23-3 packaging, sharing identical pinout (RESET/VCC/GND) and function. However, it is not pin-compatible with open-drain or active-low variants like MXD1811UR41 or MAX809TR41D3T due to differing output polarity and drive structure - direct substitution requires verification of reset logic level requirements.
MXD1812UR41 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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.12V
- 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
MXD1812UR41 FAQ
1.How can I place an order for MXD1812UR41 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812UR41 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 MXD1812UR41 reliable?
The price and inventory of MXD1812UR41 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812UR41 is usually 5 days.
3.What payment methods are accepted for MXD1812UR41?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812UR41 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812UR41?
MXD1812UR41 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812UR41 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 MXD1812UR41?
For technical support, including MXD1812UR41 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812UR41 requirements.
6.How does Aetrix verify that MXD1812UR41 is sourced from the original manufacturer or authorized distributors?
All MXD1812UR41 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 MXD1812UR41 meets industry standards.
7.What is the process for return or replacement of MXD1812UR41?
All MXD1812UR41 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812UR41, 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 MXD1812UR41 part is unused and in its original packaging.
Return procedure for MXD1812UR41:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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