My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MXD1818UR26+T
- Part No.:
- MXD1818UR26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR26+T.pdf
- Description:
- IC MPU RESET CIRC 2.55V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MXD1818UR26+T from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT23-3 package, designed for +2.5V/+3.0V/+3.3V systems with factory-set 2.55V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and debounced manual-reset detection via the RESET pin. It asserts an active-low open-drain RESET output and guarantees valid logic down to VCC = +1V.
For engineers reviewing the MXD1818UR26+T datasheet, MXD1818UR26+T pinout, MXD1818UR26+T application, or MXD1818UR26+T equivalent, key selection criteria include reset threshold accuracy, manual-reset debounce timing (1.5μs minimum low pulse), supply current (4μA typical at 3.6V), and compatibility with portable/battery-powered μP monitoring where space and power are constrained.
Technical Context
The MXD1818UR26+T integrates a precision voltage comparator with hysteresis, internal 5.5kΩ pullup resistor on the open-drain RESET output, and dedicated manual-reset detection circuitry that triggers only after ≥1.5μs low assertion on RESET - enabling reliable mechanical switch interfacing without external RC filtering. Its BiCMOS process ensures transient immunity against fast VCC glitches.
It operates across -40°C to +105°C, maintains reset assertion for ≥100ms after VCC rises above 2.55V, and sustains functional RESET/RESET logic states even as VCC declines to +1V - critical for brownout recovery in embedded controllers and portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V ±2.5% over -40°C to +105°C - ensures accurate brownout detection for 2.5V/3.0V/3.3V rails |
| Reset Timeout Period | 100ms minimum after VCC rise - guarantees sufficient μP initialization time before release |
| Supply Current | 4μA typical at VCC = +3.6V - enables multi-year battery life in portable equipment |
| Manual-Reset Detect | 1.5μs minimum low pulse on RESET pin - rejects switch bounce while enabling pushbutton initiation |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset signaling down to near-dead-battery conditions |
| Output Type | Open-drain, active-low RESET with internal 5.5kΩ pullup - simplifies bidirectional μP reset interface without external components |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint ideal for space-constrained PCB layouts |
Pinout & Package
SOT23-3 package: 2.92mm × 1.3mm × 1.02mm body, gull-wing leads, RoHS-compliant lead(Pb)-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain, active-low reset output with internal 5.5kΩ pullup to VCC - sinks current when asserted, floats high when released |
| 2 | VCC | Supply input and reset-threshold monitor node - powers internal circuitry and sets comparator reference |
| 3 | GND | Analog and digital ground reference - must be low-impedance connection to ensure accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.55V threshold | ±2.5% accuracy over full temperature range eliminates need for external calibration or trimming |
| Debounced manual-reset input | 1.5μs minimum low pulse detection prevents false resets from mechanical switch bounce |
| No external components required | Integrated pullup, comparator, timer, and debounce logic reduce BOM count and layout area |
| VCC transient immunity | Rejects negative-going VCC glitches up to 100μs duration (at 200mV overdrive) - avoids spurious resets |
| Valid operation down to VCC = +1V | Ensures deterministic RESET state during deep brownout - critical for safe μP shutdown sequencing |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Monitoring 3.3V core supply in industrial PLC controller during cold start and line sag. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET until VCC stabilizes above 2.55V and holds for ≥100ms. Use Value: Prevents erratic firmware execution by guaranteeing clean μP reset before code fetch begins. | Use Scenario: Power supervision in handheld multimeter with lithium coin-cell battery. IC Role / Device Role / Timing Role: Low-quiescent-current (4μA) reset supervisor detecting battery decay below 2.55V. Use Value: Extends usable battery life while ensuring instrument resets cleanly before measurement corruption occurs. |
| Set-Top Boxes | Portable/Battery-Powered Equipment |
Use Scenario: Reset coordination between main SoC and peripheral ASIC during 3.3V rail ramp-up. IC Role / Device Role / Timing Role: Open-drain RESET output interfaces directly with bidirectional SoC reset pin without external pullup. Use Value: Eliminates discrete pullup resistor, reducing component count and board area in cost-sensitive consumer devices. | Use Scenario: Pushbutton-initiated system reset in Bluetooth headset during field service. IC Role / Device Role / Timing Role: Manual-reset detect circuit triggers 100ms RESET pulse upon ≥1.5μs button press - immune to contact chatter. Use Value: Enables reliable user-triggered recovery without firmware involvement or external debounce hardware. |
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, no manual-reset detect, same SOT23-3 package and 100ms timeout | Lacks pushbutton debounce; suitable only for power-only monitoring, not user-initiated reset | Select when manual reset is unnecessary and higher threshold matches system rail tolerance |
| TPS3808G125DBVR | 1.25V threshold, adjustable delay (0–10s), 1.5μA quiescent current, SOT23-6 package | Requires external capacitor for timing; lower IQ but larger footprint and different pinout | Choose for ultra-low-power designs needing programmable timeout and tighter threshold control |
Compared with MXD1818UR26+T, MAX809TRD3+T offers simpler power-only supervision without manual reset capability, while TPS3808G125DBVR provides flexible timing and lower IQ at the cost of added external components and larger package - making MXD1818UR26+T optimal for compact, pushbutton-enabled 2.5V–3.3V systems requiring minimal BOM and proven debounce.
Availability
MXD1818UR26+T is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1818UR26+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 power management, sensing, and interface applications.
The MXD1810–MXD1818 family targets cost-sensitive, space-constrained μP reset supervision in portable, industrial, and consumer electronics - emphasizing low IQ, factory-trimmed thresholds, and integrated manual-reset functionality.
FAQ
What is the exact reset threshold voltage of MXD1818UR26+T and how tightly is it specified?
The MXD1818UR26+T has a factory-set reset threshold of 2.55V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R26" entry, with min/typ/max values of 2.47V/2.55V/2.64V. The threshold is trimmed during production and does not require external adjustment.
Does MXD1818UR26+T support manual reset, and what timing requirements apply?
Yes, MXD1818UR26+T supports debounced manual reset via its RESET pin: a logic-low pulse of ≥1.5μs triggers a guaranteed 100ms minimum reset timeout period. This feature is explicitly documented for MXD1813/MXD1818 variants in the General Description and Pin Descriptions sections, and enables reliable pushbutton use without external RC networks.
What is the output configuration of MXD1818UR26+T and does it require an external pullup resistor?
MXD1818UR26+T features an open-drain, active-low RESET output with an internal 5.5kΩ pullup resistor to VCC. No external pullup is required - this is confirmed in the Pin Descriptions section for MXD1813/MXD1818 and in the Electrical Characteristics table under "Internal Pullup Resistor, Open-Drain" (RP = 3.1kΩ to 7.5kΩ).
What is the supply current consumption of MXD1818UR26+T at typical operating conditions?
MXD1818UR26+T draws 4μA typical supply current at VCC = +3.6V and VCC > VTH (no load), as specified in the Electrical Characteristics table. At +5.5V, typical ICC is 9μA. This ultra-low quiescent current supports multi-year operation in battery-powered applications such as handheld test equipment and wearables.
Is MXD1818UR26+T compatible with 2.5V, 3.0V, and 3.3V power rails, and what is its minimum operating voltage?
Yes, MXD1818UR26+T is specifically designed for +2.5V/+3.0V/+3.3V systems, as stated in the General Description. Its supply voltage range is +1.0V to +5.5V, and it guarantees correct RESET/RESET logic states down to VCC = +1V - enabling robust operation during deep brownout conditions common in portable equipment.
MXD1818UR26+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:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.55V
- 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
MXD1818UR26+T FAQ
1.How can I place an order for MXD1818UR26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR26+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 MXD1818UR26+T reliable?
The price and inventory of MXD1818UR26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR26+T is usually 5 days.
3.What payment methods are accepted for MXD1818UR26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR26+T?
MXD1818UR26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR26+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 MXD1818UR26+T?
For technical support, including MXD1818UR26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR26+T requirements.
6.How does Aetrix verify that MXD1818UR26+T is sourced from the original manufacturer or authorized distributors?
All MXD1818UR26+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 MXD1818UR26+T meets industry standards.
7.What is the process for return or replacement of MXD1818UR26+T?
All MXD1818UR26+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR26+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 MXD1818UR26+T part is unused and in its original packaging.
Return procedure for MXD1818UR26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1818UR26+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…
