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Microchip Technology MCP1811AT-012/OT
- Part No.:
- MCP1811AT-012/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811AT-012/OT.pdf
- Description:
- IC REG LINEAR 1.2V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,395
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Product details
Overview
MCP1811AT-012/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 1.2 V output, designed for energy-constrained systems requiring stable voltage under light-to-moderate load and deep sleep operation. It supports 1.8–5.5 V input, features output discharge during shutdown, and operates across –40°C to +85°C.
For engineers reviewing the MCP1811AT-012/OT datasheet, MCP1811AT-012/OT pinout, MCP1811AT-012/OT application, or MCP1811AT-012/OT equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options - all grounded in Microchip's DS20006088C documentation.
Technical Context
The MCP1811AT-012/OT implements a PMOS pass transistor architecture enabling ultra-low IQ while maintaining fast transient response and stability with only 1.0 µF ceramic output capacitance. Its integrated discharge transistor (RDCH = 100 Ω typical) actively pulls VOUT to GND when SHDN = GND, eliminating residual voltage hold-up in battery-powered sleep states.
This device belongs to the MCP1811A subfamily (A-suffix denotes output discharge), uses a 3-lead SOT-23 package, and is optimized for applications where quiescent current dominates system energy budget - such as multi-year sensor nodes or wearable devices operating >99% of time in standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for 1.2 V logic rails (e.g., low-power MCUs, RF transceivers) |
| Max Output Current | 150 mA - sufficient to power microcontrollers, sensors, and BLE radios without external boost stages |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load applications using CR2032 |
| Shutdown Current | 10 nA typical - reduces leakage to negligible levels during full system hibernation |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and USB-supplied systems |
| Dropout Voltage | 400 mV at 150 mA - allows regulation down to 1.6 V input, extending usable battery range |
| Stability Capacitor | 1.0 µF ceramic (X7R) - minimizes BOM count and PCB area vs. electrolytic/tantalum alternatives |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), footprint-compatible with industry-standard passive and active components; thermal resistance θJA = 211.33°C/W on 4-layer FR4 board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 1.8–5.5 V unregulated input; requires local 1 µF ceramic bypass capacitor |
| 2 (GND) | Ground Reference | Low-impedance return path for regulator ground current; must connect directly to output capacitor ground |
| 3 (VOUT) | Regulated Output | Delivers stable 1.2 V ±4%; requires ≥1.0 µF X7R ceramic capacitor for loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables decade-scale battery life in always-on IoT endpoints without duty-cycling hardware |
| Active output discharge | Drives VOUT to GND within microseconds of shutdown, preventing back-powering of upstream circuitry |
| Ceramic-capacitor stability | Eliminates ESR requirements and enables compact, high-reliability designs with no tantalum dependency |
| Overcurrent protection | Current-limit foldback (50 mA typical) prevents thermal runaway during short-circuit events |
| Wide temperature range | Guaranteed operation from –40°C to +85°C junction temperature for industrial and medical deployments |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
Use Scenario: Indoor light-harvesting sensor node powering a sub-GHz radio and MEMS accelerometer with intermittent wake-ups every 5 minutes. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 1.2 V to MCU core and analog front-end during active bursts and maintaining <250 nA system sleep current. Use Value: Enables >7-year operation on a single 20 mm² amorphous silicon solar cell + 100 µF supercapacitor, eliminating battery replacement. |
Use Scenario: Disposable glucose monitor patch worn continuously for 14 days, sampling biopotential signals every 30 seconds. IC Role / Device Role / Timing Role: Supplies regulated 1.2 V to ultra-low-power ADC and Bluetooth LE SoC; discharges VOUT during 28-day shelf storage to prevent electrode corrosion. Use Value: Reduces total system standby current to 12 nA (including LDO + MCU), extending shelf life and clinical accuracy. |
| Smart Card Power Management | Long-Life Industrial Logger |
Use Scenario: Contactless payment card with embedded secure element and NFC interface, powered only during RF field coupling. IC Role / Device Role / Timing Role: Provides clean 1.2 V rail during brief 10–100 ms NFC power bursts; shuts down fully between transactions. Use Value: Delivers 150 mA peak current with <10 µs start-up delay, ensuring secure element initialization completes before field collapse. |
Use Scenario: Remote environmental logger in oil/gas pipeline monitoring, recording temperature/pressure every hour and transmitting via LoRaWAN monthly. IC Role / Device Role / Timing Role: Regulates 1.2 V for MCU, sensor, and LoRa transceiver; maintains 250 nA sleep current over –40°C to +85°C ambient. Use Value: Supports 15-year deployment without maintenance by minimizing self-discharge of primary lithium thionyl chloride cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-012/TT | Same electrical specs; 3-lead SC70 package (smaller footprint, higher θJA = 300.6°C/W) | Better suited for space-constrained wearables where thermal margin >10°C is available | Select when PCB area is critical and ambient temperature remains ≤60°C |
| Torex XC6210B122MR-G | 1.2 V, 150 mA, 250 nA IQ, but no output discharge; 3-lead SOT-23 | Cannot actively discharge VOUT - requires external FET or resistor network for safe shutdown | Choose only if output discharge is unnecessary and supply chain diversification is prioritized |
Compared with MCP1811AT-012/OT, the /TT variant trades thermal performance for size reduction, while the XC6210B122MR-G lacks integrated discharge - making the MCP1811AT-012/OT uniquely suitable for battery-sensitive, safety-critical shutdown sequences.
Availability
MCP1811AT-012/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and long-life industrial loggers requiring stable component supply with guaranteed 10+ year lifecycle support.
Supply support for MCP1811AT-012/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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software.
The MCP1811A family was engineered specifically for ultra-low-power battery and energy-harvesting applications - delivering nanoscale quiescent current without sacrificing output capability or robustness in harsh environments.
FAQ
What is the maximum input voltage rating for the MCP1811AT-012/OT?
The MCP1811AT-012/OT has an absolute maximum input voltage of +6.0 V. However, its operational input range is specified from 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate reliability limits per Microchip's DS20006088C Absolute Maximum Ratings table. Always maintain VIN ≤ 5.5 V in normal operation.
Does the MCP1811AT-012/OT require an external shutdown control signal?
No - the MCP1811AT-012/OT does not include a dedicated SHDN pin. As a 3-lead SOT-23 variant (VIN/GND/VOUT), it lacks enable/disable functionality. Shutdown is achieved by removing input voltage. For controlled on/off sequencing, consider the 5-lead variants like MCP1811T-012/OT which include SHDN.
Can the MCP1811AT-012/OT be used with a 0.47 µF output capacitor?
No. The MCP1811AT-012/OT requires a minimum of 1.0 µF ceramic (X7R) output capacitance for guaranteed stability across temperature and load conditions. Using 0.47 µF risks oscillation, poor transient response, and output voltage deviation beyond ±4%. Microchip validates stability only with ≥1.0 µF.
Is the 1.2 V output of the MCP1811AT-012/OT trimmed at production?
Yes. The MCP1811AT-012/OT features factory-trimmed 1.2 V output with initial accuracy of ±2% (typical) and ±4% (maximum) over temperature and line/load conditions, as confirmed in Table 1-1 of DS20006088C. This eliminates need for external feedback resistors or post-production calibration.
What is the thermal performance of the MCP1811AT-012/OT in a standard PCB layout?
On a JEDEC-standard 4-layer FR4 board with 1 oz. copper and no thermal vias, the MCP1811AT-012/OT (3-lead SOT-23) exhibits θJA = 211.33°C/W. At 150 mA load and 5.5 V input, power dissipation is ~645 mW, resulting in ~136°C junction rise above ambient - exceeding safe limits. Derating or adding thermal vias is required for continuous full-load operation.
MCP1811AT-012/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):
- 1.2V
- 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-012/OT FAQ
1.How can I place an order for MCP1811AT-012/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-012/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-012/OT reliable?
The price and inventory of MCP1811AT-012/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-012/OT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-012/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-012/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-012/OT?
MCP1811AT-012/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-012/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-012/OT?
For technical support, including MCP1811AT-012/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-012/OT requirements.
6.How does Aetrix verify that MCP1811AT-012/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-012/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-012/OT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-012/OT?
All MCP1811AT-012/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-012/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-012/OT part is unused and in its original packaging.
Return procedure for MCP1811AT-012/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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