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Microchip Technology MCP1811AT-025/OT
- Part No.:
- MCP1811AT-025/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811AT-025/OT.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
MCP1811AT-025/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 2.5 V output, 1.8–5.5 V input range, and output discharge during shutdown. It operates across –40°C to +85°C and is stable with a 1.0 µF ceramic output capacitor - ideal for energy harvesting and long-life battery-powered wearable electronics.
For engineers reviewing the MCP1811AT-025/OT datasheet, MCP1811AT-025/OT pinout, MCP1811AT-025/OT application, or MCP1811AT-025/OT equivalent, this page delivers verified electrical specs, package mapping, thermal performance, shutdown behavior, and real-world use cases aligned to Microchip's DS20006088C design documentation.
Technical Context
The MCP1811AT-025/OT implements a PMOS pass transistor architecture enabling ultra-low IQ operation and fast load transient response. Its internal error amplifier and reference circuit maintain ±4% output voltage accuracy over temperature and load while supporting output discharge via an integrated NMOS switch tied to SHDN.
This variant belongs to the MCP1811A subfamily - distinguished by output discharge capability (RDCH = 100 Ω typical) and 10 nA typical shutdown current - and is optimized for systems requiring rapid power-state transitions without external discharge circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% - ensures stable supply for 2.5 V logic, ADC references, or sensor biasing without external feedback. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-mode IoT nodes drawing microamp-level standby current. |
| Max Output Current | 150 mA - sufficient for BLE SoCs, low-power MCUs, or analog front-ends in compact wearables. |
| Dropout Voltage | 400 mV at 150 mA - allows regulation down to VIN = 2.9 V, extending usable battery voltage range in single-cell Li-ion or alkaline systems. |
| Input Voltage Range | 1.8 V to 5.5 V - supports direct connection to harvested energy sources (e.g., solar, thermal) or wide-input battery stacks. |
| Shutdown Current | 10 nA typical - reduces system leakage to negligible levels during deep-sleep or storage modes. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - minimizes PCB area and cost while delivering low-noise, high-PSRR performance. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), footprint-compatible with SC70; thermal resistance θJA = 211.33°C/W on standard 4-layer FR4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor to minimize noise and ensure stability. |
| VOUT | Regulated output | Delivers fixed 2.5 V; connects directly to load and output capacitor; no external feedback required. |
| GND | Ground reference | Low-impedance return path for ground current only; tie to quiet ground plane or output capacitor return for optimal PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Output discharge on shutdown | Integrated NMOS discharge switch (RDCH = 100 Ω) rapidly drains VOUT to GND when SHDN = GND - eliminates hold-up voltage that could delay system reset or cause latch-up. |
| Ceramic capacitor stability | Guaranteed stable with ≥1.0 µF X7R ceramic output cap - avoids costly tantalum or electrolytic alternatives and reduces ESR-related noise. |
| Ultra-low shutdown IQ | 10 nA typical shutdown current - enables >10-year shelf life in battery-backed medical sensors or smart cards. |
| Wide input voltage range | Operates from 1.8 V - compatible with partially discharged coin cells or energy harvesters with variable output - up to 5.5 V for USB-supplied backup. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events without latch-off. |
Applications
| Energy Harvesting Systems | Wearable Electronics |
|---|---|
Use Scenario: Powering wireless sensor nodes from thermoelectric or piezoelectric harvesters with intermittent, low-voltage output. IC Role / Device Role / Timing Role: Primary voltage regulator converting unstable harvester output into clean, regulated 2.5 V for MCU and RF transceiver. Use Value: 250 nA quiescent current ensures minimal drain during idle periods; 1.8 V minimum input allows operation even at harvester startup voltage. | Use Scenario: Supplying 2.5 V to optical heart-rate sensors and BLE radios in fitness trackers. IC Role / Device Role / Timing Role: Main LDO for analog sensor bias and digital core - activated only during measurement bursts. Use Value: Output discharge clears residual voltage between measurements, preventing sensor offset drift and ensuring accurate baseline calibration. |
| Smart Cards & Secure Tokens | Hearing Aids & Implantable Sensors |
Use Scenario: Providing regulated power to contactless secure elements powered by NFC field coupling. IC Role / Device Role / Timing Role: Standby regulator maintaining 2.5 V rail during card sleep mode; enabled only during transaction windows. Use Value: 10 nA shutdown current extends functional lifetime of passive cards beyond 5 years under typical usage. | Use Scenario: Powering ultra-low-power analog front-ends and ASICs in rechargeable hearing aids. IC Role / Device Role / Timing Role: Primary supply for microphone preamp and DSP - must remain stable during battery voltage sag. Use Value: 400 mV dropout at 150 mA allows full utilization of 3.0 V Li-ion cell down to 2.9 V, maximizing usable capacity per charge cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-2502E/OT | Same 2.5 V output, identical 3-lead SOT-23 package, but rated for extended temperature range (–40°C to +125°C). | Required for automotive cabin modules or industrial edge sensors operating above +85°C ambient. | Select when junction temperature exceeds +85°C; otherwise, MCP1811AT-025/OT provides identical performance at lower cost. |
| Torex XC6206P252MR-G | 2.5 V fixed output, 250 nA IQ, but no output discharge; shutdown current = 1 µA (vs. 10 nA); SOT-23-3 pinout matches. | Suitable where fast VOUT discharge is unnecessary and higher shutdown leakage is acceptable. | Use only if system does not require active discharge - e.g., non-reset-critical applications with external pull-downs. |
Compared with MCP1811AT-2502E/OT, the MCP1811AT-025/OT trades extended temperature rating for lower unit cost and same core ultra-low-power performance; versus XC6206P252MR-G, it delivers 100× lower shutdown current and integrated discharge - critical for precision reset timing and zero-leakage sleep states.
Availability
MCP1811AT-025/OT is available at Aetrix Electronics and suitable for energy harvesting systems, wearable medical devices, and smart card readers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811AT-025/OT 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
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.
The MCP1811A family was designed specifically for ultra-low-power, long-life battery and energy-harvesting applications - prioritizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated power-management features like output discharge.
FAQ
What is the maximum continuous output current of the MCP1811AT-025/OT?
The MCP1811AT-025/OT delivers up to 150 mA of continuous output current under specified thermal conditions. This value is validated per Microchip's DS20006088C datasheet and assumes adequate PCB copper area and ambient temperature ≤+85°C. Exceeding 150 mA may trigger foldback current limiting or thermal shutdown depending on layout and load duty cycle.
Does the MCP1811AT-025/OT require an external resistor network to set the output voltage?
No - the MCP1811AT-025/OT is a fixed-output LDO with factory-trimmed 2.5 V regulation. It contains no feedback pins or external resistor connections; the output voltage is internally set and requires no external components beyond input/output capacitors.
How does the output discharge feature work on the MCP1811AT-025/OT?
When the SHDN pin is pulled low (GND), the MCP1811AT-025/OT activates an internal NMOS discharge transistor (RDCH ≈ 100 Ω) between VOUT and GND. This discharges the output capacitor within microseconds, eliminating residual voltage that could interfere with system reset sequencing or cause unintended wake-up in downstream logic.
Can the MCP1811AT-025/OT operate with a 1.5 V input supply?
No - the MCP1811AT-025/OT has a minimum input voltage of 1.8 V per its absolute specifications. At 1.5 V, the device will not regulate and VOUT will track VIN minus pass transistor drop, resulting in unregulated 2.5 V output failure. For sub-1.8 V sources, a boost converter must precede the MCP1811AT-025/OT.
Is the MCP1811AT-025/OT compatible with 0402-size ceramic capacitors?
Yes - the MCP1811AT-025/OT is stable with 1.0 µF X7R ceramic capacitors in 0402, 0603, or larger case sizes. Microchip validates stability using standard X7R dielectrics; Y5V or Z5U types are not recommended due to capacitance shift with DC bias and temperature.
MCP1811AT-025/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 110 µA
- PSRR:
- 50dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MCP1811AT-025/OT FAQ
1.How can I place an order for MCP1811AT-025/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-025/OT 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 MCP1811AT-025/OT reliable?
The price and inventory of MCP1811AT-025/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811AT-025/OT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-025/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-025/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-025/OT?
MCP1811AT-025/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-025/OT 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 MCP1811AT-025/OT?
For technical support, including MCP1811AT-025/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-025/OT requirements.
6.How does Aetrix verify that MCP1811AT-025/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-025/OT 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 MCP1811AT-025/OT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-025/OT?
All MCP1811AT-025/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-025/OT, 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 MCP1811AT-025/OT part is unused and in its original packaging.
Return procedure for MCP1811AT-025/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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