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Microchip Technology MCP1811AT-030/LB
- Part No.:
- MCP1811AT-030/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811AT-030/LB.pdf
- Description:
- IC REG LINEAR 3V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,766
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Product details
Overview
MCP1811AT-030/LB from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO linear regulator with fixed 3.0 V output, 250 nA typical IQ, and shutdown capability (10 nA typical ISHDN). It operates from 1.8V to 5.5V input and is stable with a 1.0 µF ceramic output capacitor. Designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1811AT-030/LB datasheet, MCP1811AT-030/LB pinout, MCP1811AT-030/LB application, or MCP1811AT-030/LB equivalent, this page delivers verified electrical specs, package mapping, functional role in low-power sleep/wake architectures, and validated alternative options - all grounded in Microchip's DS20006088C datasheet.
Technical Context
The MCP1811AT-030/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 150 mA) and near-zero quiescent current across its full operating temperature range (–40°C to +85°C). Its internal error amplifier and reference are optimized for stability with minimal 1.0 µF ceramic output capacitance.
It features active output discharge during shutdown (SHDN = GND), a dedicated SHDN pin with 70% VIN logic-high threshold, and overcurrent protection with foldback limiting (50 mA at RLOAD = 1 Ω). The device lacks an NC pin and uses a 3-terminal configuration in its SOT-23 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±4% - ensures stable rail for 3.3 V–tolerant microcontrollers and sensors without external feedback. |
| Max Output Current | 150 mA - supports moderate-current peripherals (e.g., BLE radios, ADCs) while maintaining ultra-low IQ in sleep mode. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices drawing <1 µA average current (e.g., coin-cell-powered IoT nodes). |
| Shutdown Current | 10 nA typical - reduces system standby power to negligible levels when host MCU asserts SHDN. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and NiMH sources across charge/discharge cycles. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to ~3.4 V input when delivering full load at 3.0 V output. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, reducing board area and cost. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), surface-mount, lead-free, RoHS-compliant. Thermal resistance θJA = 211.33°C/W on standard 4-layer FR4 board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V unregulated input; requires local 1 µF ceramic bypass capacitor to minimize noise coupling. |
| VOUT | Regulated output | Delivers stable 3.0 V; connects directly to load and output capacitor; must be decoupled with ≥1.0 µF X7R ceramic. |
| GND | Ground reference | Low-impedance return path for regulator ground current only; tie to quiet ground plane or output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical - extends shelf life and operational lifetime of primary batteries (e.g., CR2032) by >5× vs. conventional LDOs. |
| Active output discharge | RDCH = 100 Ω typical - rapidly discharges VOUT to GND upon shutdown, preventing unintended wake-up or latch-up in downstream circuitry. |
| Ceramic-capacitor stability | 1.0 µF minimum COUT - eliminates ESR requirements and simplifies layout; enables use of small, low-cost, high-reliability MLCCs. |
| Wide input voltage range | 1.8 V to 5.5 V - supports direct connection to harvested energy sources (e.g., solar, thermal, RF) without pre-regulation. |
| Overcurrent foldback | 50 mA short-circuit limit - protects both regulator and source during fault conditions while minimizing thermal stress. |
Applications
| Energy Harvesting Node | Hearing Aid Power Management |
|---|---|
Use Scenario: Indoor light-harvesting sensor node powering a sub-1 µA MCU and BLE transmitter intermittently. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 3.0 V to MCU and radio during active bursts; enters 10 nA shutdown between transmissions. Use Value: Enables >10-year operation on a single AA alkaline cell by minimizing quiescent loss during 99.9% duty-cycle sleep. |
Use Scenario: Miniaturized rechargeable hearing aid using a 3.7 V Li-ion cell with tight space constraints. IC Role / Device Role / Timing Role: Post-regulator delivering clean, stable 3.0 V to ultra-low-power DSP and MEMS microphone amplifier. Use Value: Maintains regulated output down to 3.4 V input, maximizing usable battery capacity and runtime per charge cycle. |
| Smart Wearable Sensor Hub | Medical Implantable Monitor |
Use Scenario: Wrist-worn health monitor sampling ECG/PPG every 5 seconds, transmitting data hourly via Bluetooth Low Energy. IC Role / Device Role / Timing Role: System power rail generator with fast start-up (<400 µs) from shutdown to support burst-mode sensing. Use Value: Delivers 150 mA peak current for radio transmission while sustaining 250 nA sleep IQ - critical for multi-week wearable battery life. |
Use Scenario: Subcutaneous glucose monitor powered by a hermetically sealed lithium-thionyl chloride cell requiring >10-year shelf life. IC Role / Device Role / Timing Role: Primary regulator enabling ultra-deep sleep modes; output discharge prevents leakage through sensor bias networks. Use Value: 10 nA shutdown current minimizes self-discharge, preserving >95% battery capacity after 5 years of storage before implantation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3002E/MB | Same 3.0 V output, 250 nA IQ, but no output discharge; 3-lead SOT-23 package. | Lacks active VOUT discharge - unsuitable where rapid rail collapse is required to prevent back-powering or false wake-up. | Select when lowest possible BOM cost and footprint are prioritized over discharge functionality. |
| Torex XC6206P302MR-G | 3.0 V, 1 µA IQ (10× higher than MCP1811AT-030/LB), 150 mA output, 1.0 µF stable, SOT-23-3. | Higher quiescent current limits battery life in multi-year applications; no shutdown pin or discharge function. | Choose only if Microchip supply chain constraints exist and 1 µA IQ meets system sleep budget. |
Compared with MCP1700T-3002E/MB and XC6206P302MR-G, the MCP1811AT-030/LB uniquely combines 250 nA IQ, active output discharge, and 150 mA capability in a 3-pin SOT-23 - making it the sole option for ultra-long-life designs requiring both deep sleep efficiency and controlled power-rail sequencing.
Availability
MCP1811AT-030/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable sensor hubs requiring stable component supply and guaranteed long-term manufacturability.
Supply support for MCP1811AT-030/LB 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, analog, FPGA, and mixed-signal semiconductor solutions, headquartered in Chandler, Arizona.
The MCP1811 family was designed specifically for ultra-low-power, battery-constrained applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated discharge control to enable decade-long operation in edge-sensing and medical devices.
FAQ
What is the maximum input voltage rating for the MCP1811AT-030/LB?
The MCP1811AT-030/LB has an absolute maximum input voltage rating of +6.0 V. Operation beyond this level risks permanent damage. For reliable continuous operation, the input voltage must remain within the specified 1.8 V to 5.5 V range, with minimum VIN determined by both load current and dropout voltage (e.g., ≥3.4 V at 150 mA load for 3.0 V output).
Does the MCP1811AT-030/LB require an external resistor divider for output voltage setting?
No. The MCP1811AT-030/LB is a fixed-output LDO with factory-trimmed 3.0 V regulation. It contains no feedback pins or external resistor connections - the output voltage is internally set and does not require external components for adjustment.
How does the output discharge function operate in the MCP1811AT-030/LB?
When the SHDN pin is pulled to GND, the MCP1811AT-030/LB activates an internal discharge transistor (RDCH ≈ 100 Ω) between VOUT and GND. This safely collapses the output voltage within microseconds, preventing residual charge from powering downstream circuitry or causing undefined logic states during system sleep.
Can the MCP1811AT-030/LB be used with a 1.0 µF X5R ceramic capacitor instead of X7R?
Yes - the MCP1811AT-030/LB is stable with any 1.0 µF ceramic capacitor meeting the minimum capacitance and ESR requirements. X5R is acceptable if its DC bias derating maintains ≥1.0 µF at rated voltage and operating temperature; however, X7R is preferred for tighter capacitance retention across voltage and temperature.
What is the thermal performance of the MCP1811AT-030/LB in SOT-23 package under full 150 mA load?
In a JEDEC-standard 4-layer FR4 board with 1 oz. copper, the MCP1811AT-030/LB (SOT-23) has θJA = 211.33°C/W. At 150 mA and 3.0 V output with 5.5 V input (2.5 V dropout), power dissipation is ~375 mW, resulting in ~80°C junction rise above ambient - well within the +85°C max operating TJ if ambient remains ≤25°C. Use thermal vias for higher ambient environments.
MCP1811AT-030/LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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):
- 3V
- 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:
- SC-70-3
MCP1811AT-030/LB FAQ
1.How can I place an order for MCP1811AT-030/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-030/LB 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-030/LB reliable?
The price and inventory of MCP1811AT-030/LB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811AT-030/LB is usually 5 days.
3.What payment methods are accepted for MCP1811AT-030/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-030/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-030/LB?
MCP1811AT-030/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-030/LB 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-030/LB?
For technical support, including MCP1811AT-030/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-030/LB requirements.
6.How does Aetrix verify that MCP1811AT-030/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-030/LB 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-030/LB meets industry standards.
7.What is the process for return or replacement of MCP1811AT-030/LB?
All MCP1811AT-030/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-030/LB, 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-030/LB part is unused and in its original packaging.
Return procedure for MCP1811AT-030/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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