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Analog Devices Inc./Maxim Integrated MXD1816UR23+T
- Part No.:
- MXD1816UR23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1816UR23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MXD1816UR23+T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC and asserts RESET when supply voltage falls below 2.31V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, draws only 4μA typical supply current, and features an internal 5.5kΩ pullup resistor - enabling reliable power-on reset in portable battery-powered equipment.
For engineers reviewing the MXD1816UR23+T datasheet, MXD1816UR23+T pinout, MXD1816UR23+T application, or MXD1816UR23+T equivalent, key selection criteria include its 2.31V factory-trimmed reset threshold, SOT23-3 open-drain output architecture, guaranteed operation down to VCC = +1V, and compatibility with bidirectional μP reset pins without external pullups.
Technical Context
The MXD1816UR23+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 2.31V, coupled with a monolithic timer that enforces a minimum 100ms reset timeout after VCC rises above threshold. Its open-drain output structure allows wired-OR interfacing and eliminates need for external pullup components.
This device belongs to the MXD1815–MXD1818 subfamily optimized for low-voltage systems (2.5V/3.0V/3.3V), uses BiCMOS process technology, and incorporates transient immunity circuitry to suppress false resets from sub-µs negative-going VCC glitches up to 100µs duration at 200mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% over -40°C to +105°C - ensures accurate brownout detection for 2.5V/3.3V systems |
| Reset Timeout Period | 100ms minimum - guarantees sufficient μP initialization time after power recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable instrumentation |
| Operating Voltage Range | +1.2V to +5.5V - supports valid RESET assertion even during deep brownout conditions |
| Output Type | Open-drain, active-low with 5.5kΩ internal pullup - simplifies interface to bidirectional μP reset pins |
| Package | SOT23-3 - space-saving footprint compatible with high-density PCB layouts |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1816UR23+T is housed in a 3-pin SOT23 package (outline U3-1), with 1.3mm × 2.9mm footprint and 0.95mm height - suitable for compact portable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output; requires external pullup only if interfacing to non-bidirectional logic; sinks ≥10mA when asserted |
| 2 | VCC | Power supply input and reset threshold monitoring node; accepts 1.2V–5.5V; comparator ignores transients <100µs |
| 3 | GND | Analog ground reference for internal voltage reference and comparator; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, comparator, timer, and 5.5kΩ pullup eliminate BOM cost and layout area |
| Precision reset threshold | Factory-trimmed 2.31V with ±2.5% accuracy over full temperature range ensures consistent brownout behavior |
| Low-power operation | 4μA typical ICC enables use in always-on battery-backed systems without compromising runtime |
| VCC = +1V functional guarantee | RESET remains valid down to 1.2V supply - critical for graceful shutdown in energy-harvesting or ultra-low-power systems |
| Transient immunity | Immune to VCC glitches ≤100µs at 200mV overdrive - prevents spurious resets in noisy industrial environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor operating on 3.3V rail with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervises 3.3V supply and asserts active-low RESET to ARM Cortex-M0+ MCU during brownout events. Use Value: Ensures deterministic boot state after voltage sag caused by RF transmission bursts, using only 4μA quiescent current to extend battery life. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V-to-3.3V DC/DC converter powering digital I/O ASICs. IC Role / Device Role / Timing Role: Monitors post-regulation 3.3V rail and triggers hardware reset if input ripple exceeds tolerance during motor switching transients. Use Value: Prevents firmware lockup due to undervoltage-induced memory corruption, with 100ms timeout ensuring complete ASIC initialization. |
| Smart Meter Communication Modules | Handheld Test Equipment |
Use Scenario: NB-IoT cellular modem module powered from lithium-thionyl chloride primary cell with 3.6V nominal output. IC Role / Device Role / Timing Role: Detects end-of-life voltage drop below 2.31V and forces controlled shutdown sequence via open-drain RESET line. Use Value: Enables safe data flush and flash write-protection before power loss, leveraging internal pullup to avoid extra component count. |
Use Scenario: Portable oscilloscope with FPGA-based acquisition engine requiring stable reset during battery swap. IC Role / Device Role / Timing Role: Provides glitch-free power-on reset signal synchronized to 3.3V rail stabilization after hot-swap of Li-ion pack. Use Value: Eliminates need for RC network timing circuits, reducing bill-of-materials while maintaining 100ms minimum reset hold time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.93V reset threshold, same SOT23-3 package, 14μA supply current | Designed for +3.3V systems with higher threshold margin; less suitable for 2.5V brownout detection | Select when system requires tighter 2.93V trip point and can tolerate higher quiescent current |
| TPS3808G125DBVR | 1.25V adjustable threshold via external resistor divider, 16μA supply current, enable input | Offers programmability but adds two external resistors; lacks internal pullup for open-drain mode | Choose when flexible threshold tuning is required and board space allows for divider network |
Compared with MXD1816UR23+T, MAX809TRD3+T provides higher reset voltage margin at the cost of increased supply current and reduced low-voltage operation capability, while TPS3808G125DBVR trades fixed-threshold simplicity for design flexibility and external component overhead.
Availability
MXD1816UR23+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication modules, and handheld test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1816UR23+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) is a semiconductor company specializing in analog, mixed-signal, and high-reliability ICs for industrial, communications, and computing applications.
The MXD1815–MXD1818 product line delivers ultra-low-power, factory-trimmed reset supervisors for battery-operated and space-constrained 2.5V/3.3V systems - emphasizing precision, minimal external components, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MXD1816UR23+T and how tightly is it specified?
The MXD1816UR23+T has a factory-set reset threshold of 2.31V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +105°C. This specification is confirmed in the Electrical Characteristics table under "Reset Threshold" for suffix R23, and reflects production testing at +25°C with limits over temperature guaranteed by design - ensuring consistent brownout response in 2.5V/3.3V systems without calibration.
Does MXD1816UR23+T require an external pullup resistor on the RESET pin?
No, MXD1816UR23+T does not require an external pullup resistor because it integrates a 5.5kΩ internal pullup to VCC on its open-drain RESET output. This feature enables direct connection to bidirectional microcontroller reset pins (e.g., Motorola 68HC11) without additional components, reducing BOM count and PCB area - as explicitly stated in the Pin Descriptions and Applications Information sections.
Can MXD1816UR23+T operate reliably when VCC drops below 2.0V?
Yes, MXD1816UR23+T is guaranteed to maintain valid RESET/RESET logic states down to VCC = +1.2V (minimum specified), and functional operation is ensured to +1.0V per Absolute Maximum Ratings. The device continues asserting RESET during deep brownout, supporting controlled shutdown in energy-harvesting or ultra-low-power applications where supply rails decay gradually.
What is the reset timeout period of MXD1816UR23+T and is it adjustable?
The MXD1816UR23+T provides a fixed reset timeout period of 100ms minimum (150ms typical, 250ms maximum) after VCC rises above the 2.31V threshold. This timeout is internally generated and not user-adjustable - a deliberate design choice to eliminate external timing components and ensure consistent reset hold time across temperature and voltage variations, as documented in the Electrical Characteristics table under tRP.
Is MXD1816UR23+T pin-compatible with other devices in the MXD181x family?
Yes, MXD1816UR23+T shares identical SOT23-3 pinout (VCC on pin 2, GND on pin 3, open-drain RESET on pin 1) with all members of the MXD1810–MXD1818 family, including MXD1811, MXD1815, and MXD1818. This uniformity allows drop-in replacement within the same voltage-range subgroup (MXD1815–MXD1818 for 2.5V/3.3V systems), provided the reset threshold and output configuration match system requirements.
MXD1816UR23+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:
- 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
MXD1816UR23+T FAQ
1.How can I place an order for MXD1816UR23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816UR23+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 MXD1816UR23+T reliable?
The price and inventory of MXD1816UR23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816UR23+T is usually 5 days.
3.What payment methods are accepted for MXD1816UR23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816UR23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816UR23+T?
MXD1816UR23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816UR23+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 MXD1816UR23+T?
For technical support, including MXD1816UR23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816UR23+T requirements.
6.How does Aetrix verify that MXD1816UR23+T is sourced from the original manufacturer or authorized distributors?
All MXD1816UR23+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 MXD1816UR23+T meets industry standards.
7.What is the process for return or replacement of MXD1816UR23+T?
All MXD1816UR23+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816UR23+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 MXD1816UR23+T part is unused and in its original packaging.
Return procedure for MXD1816UR23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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