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Analog Devices Inc./Maxim Integrated MXD1815UR26+T
- Part No.:
- MXD1815UR26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1815UR26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,502
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Product details
Overview
MXD1815UR26+T from Maxim Integrated is a low-power microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It provides active-low, open-drain RESET output with internal 5.5kΩ pullup resistor, factory-set reset threshold of 2.55V (±2.5% over temperature), 100ms minimum reset timeout, and operates from -40°C to +105°C in SOT23-3 package - used for reliable power-on reset in portable microcontroller applications.
For engineers reviewing the MXD1815UR26+T datasheet, MXD1815UR26+T pinout, MXD1815UR26+T application, or MXD1815UR26+T equivalent, key selection criteria include its 2.55V reset threshold accuracy, 4μA supply current at 3.6V, guaranteed RESET validity down to VCC = +1V, open-drain interface compatibility with bidirectional μP reset pins, and SOT23-3 footprint suitability for space-constrained embedded designs.
Technical Context
The MXD1815UR26+T implements a precision bandgap-based voltage comparator monitoring VCC against a trimmed 2.55V threshold, with built-in hysteresis and transient immunity up to 100µs for VCC glitches. Its internal timer ensures reset remains asserted ≥100ms after VCC rises above threshold, independent of supply ramp rate.
This device belongs to the MXD1815–MXD1818 subfamily optimized for 2.5V/3.0V/3.3V systems and features open-drain active-low RESET output with integrated pullup - enabling direct connection to microcontrollers with bidirectional reset pins (e.g., Motorola 68HC11) without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V ±2.5% over -40°C to +105°C - ensures deterministic reset initiation across industrial temperature range |
| Supply Current | 4µA typical at VCC = +3.6V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms minimum - guarantees sufficient hold time for μP initialization sequences |
| Operating Voltage | 1.2V to 5.5V - supports valid RESET assertion even during brownout down to 1.2V |
| Output Type | Open-drain active-low with 5.5kΩ internal pullup - eliminates need for external resistor in most μP interfaces |
| Package | SOT23-3 - industry-standard 3-pin footprint compatible with automated assembly and high-density PCB layouts |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1815UR26+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 electronics and high-volume automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOT23) | RESET | Open-drain active-low reset output; sinks current when asserted; pulled high internally to VCC via 5.5kΩ resistor |
| 2 (SOT23) | VCC | Power supply input and reset threshold monitoring node; accepts 1.2V–5.5V; comparator reference derived internally |
| 3 (SOT23) | GND | Ground reference for all internal circuitry and output stage; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, comparator, timer, and pullup eliminate discrete BOM items and layout complexity |
| Factory-trimmed reset threshold | 2.55V ±2.5% over full temperature range - reduces calibration overhead and improves system-level yield |
| Power supply transient immunity | Immune to VCC glitches ≤100µs duration - prevents spurious resets during switching noise events |
| Low operating current | 4µA typical at 3.6V - extends battery runtime in always-on monitoring circuits |
| Valid RESET down to VCC = +1V | Ensures controlled reset assertion during deep brownout - avoids undefined μP behavior near shutdown |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Monitoring |
|---|---|
|
Use Scenario: Wearable health monitor powered by coin-cell battery requiring reliable startup and brownout recovery. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET until regulated 3.3V rail stabilizes and holds for ≥100ms. Use Value: 4µA quiescent current extends battery life; 2.55V threshold matches Li-ion discharge profile; open-drain output interfaces directly with ARM Cortex-M0+ reset pin. |
Use Scenario: Industrial PLC controller with dual 3.3V power rails where undervoltage on either rail must trigger system reset. IC Role / Device Role / Timing Role: Primary reset supervisor monitoring main 3.3V supply; asserts RESET within 5µs of VCC falling below 2.55V. Use Value: ±2.5% threshold accuracy ensures consistent trip point across temperature; 100ms timeout satisfies ARM Cortex-M4 boot timing requirements. |
| Computers and Controllers | Intelligent Instruments |
|
Use Scenario: Embedded edge gateway using RISC-V SoC with strict 3.3V supply tolerance and no external reset logic. IC Role / Device Role / Timing Role: Standalone reset generator providing clean, glitch-free active-low RESET signal synchronized to 3.3V rail rise/fall. Use Value: Internal 5.5kΩ pullup eliminates external resistor; SOT23-3 footprint fits tight board spacing; -40°C to +105°C rating supports fanless enclosure operation. |
Use Scenario: Handheld multimeter with LCD display and microcontroller, requiring fail-safe reset during battery swap or low-voltage conditions. IC Role / Device Role / Timing Role: Voltage supervisor ensuring μC enters known state before firmware execution begins after power-up or brownout. Use Value: 2.55V threshold aligns with cutoff voltage of two alkaline cells; 100ms timeout exceeds typical LCD controller initialization delay. |
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, 140µA supply current, same SOT23-3 package | Higher threshold suits 3.3V systems with tighter margin; higher ICC limits battery-life-critical use | Select when 2.93V trip point better matches system rail tolerance and power budget allows >100µA quiescent draw |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 1.1µA typical ICC, SOT23-6 package | Requires external resistor network; lower ICC enables ultra-low-power designs; different pinout and footprint | Choose for designs needing sub-2V reset or <2µA supply current, accepting added component count and layout redesign |
Compared with MAX809TRD3+T, MXD1815UR26+T offers 35× lower supply current and tighter 2.55V threshold for mid-range 3.3V systems; versus TPS3808G125DBVR, it delivers plug-and-play simplicity with no external components but trades off adjustability and ultra-low ICC.
Availability
MXD1815UR26+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC monitoring, and intelligent instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1815UR26+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 power management ICs for industrial, communications, and consumer applications.
The MXD1815–MXD1818 product line was designed specifically for low-power, precision voltage monitoring in 2.5V/3.0V/3.3V microprocessor systems - delivering factory-trimmed thresholds, minimal external components, and robust transient immunity in miniature packages.
FAQ
What is the exact reset threshold voltage of MXD1815UR26+T and how accurate is it over temperature?
The MXD1815UR26+T has a factory-set reset threshold of 2.55V, with guaranteed accuracy of ±2.5% across 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 R26, and ensures reliable trip-point consistency in industrial environments where ambient temperature fluctuates significantly. The MXD1815UR26+T achieves this via laser-trimmed internal reference circuitry.
Does MXD1815UR26+T support manual reset functionality via an external pushbutton?
No, MXD1815UR26+T does not include manual reset detection. That feature is exclusive to the MXD1813/MXD1818 variants (e.g., MXD1818UR26+T), which assert reset upon a 1.5µs minimum low pulse on the RESET pin. The MXD1815UR26+T is a dedicated power-supply monitor with automatic reset only - its RESET pin serves solely as an open-drain output, not an input for external triggering.
What is the maximum sink current capability of the RESET output on MXD1815UR26+T?
The RESET output of MXD1815UR26+T can sink up to 10mA when asserted and VOUT = 0.4V, provided VCC ≥ 2.7V. This value is specified in the Electrical Characteristics table under "RESET Output Sink Current" for open-drain devices. The internal 5.5kΩ pullup ensures proper high-state voltage level without external components, while the 10mA drive strength reliably interfaces with standard CMOS and TTL inputs.
Can MXD1815UR26+T operate with supply voltages below 2.5V, and down to what level does RESET remain valid?
Yes, MXD1815UR26+T operates with supply voltages as low as 1.2V (minimum specified), and its RESET output remains logically valid down to VCC = +1V. This is explicitly guaranteed in the datasheet's "Guaranteed RESET/RESET Valid to VCC = +1V" feature and supported by electrical characteristics showing functional operation across the full 1.2V–5.5V range - critical for brownout detection in battery-powered systems approaching end-of-life voltage.
Is MXD1815UR26+T pin-compatible with other members of the MXD181x family, such as MXD1810 or MXD1812?
Yes, MXD1815UR26+T shares identical SOT23-3 pinout (VCC, RESET, GND) with all MXD1810–MXD1813/MXD1815–MXD1818 variants, including MXD1810UR46+T and MXD1812UR41+T. However, output configuration differs: MXD1815UR26+T uses open-drain active-low RESET, whereas MXD1812URxx+T uses push-pull active-high. Direct substitution requires verifying reset polarity and load compatibility - the MXD1815UR26+T is not a drop-in replacement for push-pull variants.
MXD1815UR26+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.55V
- Output:
- Push-Pull, Totem Pole
- 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
MXD1815UR26+T FAQ
1.How can I place an order for MXD1815UR26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1815UR26+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 MXD1815UR26+T reliable?
The price and inventory of MXD1815UR26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1815UR26+T is usually 5 days.
3.What payment methods are accepted for MXD1815UR26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1815UR26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1815UR26+T?
MXD1815UR26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1815UR26+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 MXD1815UR26+T?
For technical support, including MXD1815UR26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1815UR26+T requirements.
6.How does Aetrix verify that MXD1815UR26+T is sourced from the original manufacturer or authorized distributors?
All MXD1815UR26+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 MXD1815UR26+T meets industry standards.
7.What is the process for return or replacement of MXD1815UR26+T?
All MXD1815UR26+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1815UR26+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 MXD1815UR26+T part is unused and in its original packaging.
Return procedure for MXD1815UR26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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