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Microchip Technology MCP1811BT-033/LB
- Part No.:
- MCP1811BT-033/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811BT-033/LB.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,077
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Product details
Overview
MCP1811BT-033/LB from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 3.3V output, designed for energy harvesting and long-life battery-powered systems. It operates from 1.8V to 5.5V input, supports ceramic output capacitors as small as 1.0 µF, and features 5 nA typical shutdown current - ideal for wearable electronics and medical devices requiring multi-year operation on coin cells.
For engineers reviewing the MCP1811BT-033/LB datasheet, MCP1811BT-033/LB pinout, MCP1811BT-033/LB application, or MCP1811BT-033/LB equivalent, this page delivers verified electrical specs, package mapping to 3-lead SOT-23, functional role in ultra-low-power supply rails, and validated alternative options for design continuity.
Technical Context
The MCP1811BT-033/LB belongs to the MCP1811B variant - a no-output-discharge version of Microchip's ultra-low-IQ LDO family. Its internal architecture uses a PMOS pass transistor enabling 400 mV typical dropout at 150 mA load and stable regulation across –40°C to +85°C junction temperature.
It integrates overcurrent protection and logic-level shutdown control (VSHDN-HIGH ≥70% VIN, VSHDN-LOW ≤20% VIN), with ground current scaling linearly from ~90 µA at zero load to 110 µA at full 150 mA - critical for accurate battery life modeling in sleep-active duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - ensures compatibility with 3.3V I/O domains of ultra-low-power MCUs without external feedback. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-current applications using CR2032 cells. |
| Shutdown Current | 5 nA typical - reduces standby drain to negligible levels during deep-sleep modes in sensor nodes. |
| Max Output Current | 150 mA - sufficient to power RF transceivers (e.g., BLE SoCs) or mixed-signal sensors during active bursts. |
| Input Voltage Range | 1.8V to 5.5V - supports direct connection to single-cell Li-ion, LiFePO4, or multi-cell alkaline sources. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to 3.7V input when powering 3.3V loads from aging batteries. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic caps, reducing PCB area and cost. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body height, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts unregulated input (1.8–5.5V); requires local 1 µF ceramic bypass capacitor near pin. |
| VOUT | Regulated output | Delivers stable 3.3V; connects directly to load and output capacitor (min. 1.0 µF X7R). |
| GND | Ground reference | Low-impedance return path for regulator core and load; must tie to quiet ground plane or output cap return. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical operation enables >10-year runtime on 220 mAh coin cells in 1% duty-cycle sensor nodes. |
| No output discharge | Omits internal discharge FET - prevents unintended load discharge during shutdown, preserving state in backup circuits. |
| Ceramic capacitor stability | Stable with 1.0 µF X7R ceramics - eliminates ESR requirements and simplifies layout vs. traditional LDOs. |
| Wide input range | 1.8–5.5V operation supports direct integration with harvested energy sources (e.g., solar, thermal, RF). |
| Overcurrent protection | Foldback current limit (50 mA typ.) prevents thermal runaway during short-circuit events without latch-up. |
Applications
| Wearable Health Monitors | Energy-Harvesting Sensor Nodes |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in smart patches powered by thin-film batteries. IC Role / Device Role / Timing Role: Primary 3.3V supply for analog front-end and BLE MCU during sub-µA sleep and burst-active cycles. Use Value: 250 nA IQ extends battery life beyond 3 years; 5 nA shutdown preserves charge during firmware updates. |
Use Scenario: Wireless soil moisture sensor powered by miniature solar cell + supercapacitor buffer. IC Role / Device Role / Timing Role: Regulates variable harvested voltage (2.2–4.8V) to clean 3.3V rail for microcontroller and RF transceiver. Use Value: Wide 1.8–5.5V input accommodates fluctuating harvesters; 1 µF ceramic stability reduces BOM count. |
| Implantable Hearing Aids | Smart Card Security Modules |
|
Use Scenario: Miniaturized rechargeable hearing aid with acoustic processing ASIC and Bluetooth LE radio. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for precision audio ADC/DAC and secure crypto engine. Use Value: Ultra-low noise (165.65 µVrms) avoids audible artifacts; 400 mV dropout maintains regulation as battery discharges. |
Use Scenario: Contactless payment card with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: Powers secure IC and NFC frontend from limited energy available during field coupling. Use Value: 150 mA peak current supports fast cryptographic operations; 250 nA IQ minimizes leakage during idle field exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | Same 3.3V output, 250 nA IQ, but only 250 mA max output; includes output discharge; packaged in SOT-23. | Output discharge enables faster system reset; higher current suits burst-heavy loads like GSM modems. | Select when output discharge is required and 250 mA capability adds margin for future feature expansion. |
| Torex XC6206P332MR-G | 3.3V fixed, 1 µA IQ, 250 mA output; requires 1.0 µF ceramic; no shutdown pin; SOT-23-3 package. | Lacks enable/shutdown control - always-on operation; higher IQ reduces battery life in intermittent-use devices. | Choose for cost-sensitive, always-on applications where shutdown functionality is unnecessary and 1 µA IQ suffices. |
Compared with MCP1700T-3302E/MB and XC6206P332MR-G, the MCP1811BT-033/LB provides the lowest shutdown current (5 nA vs. 100 nA and none), making it uniquely suited for multi-year battery life in infrequently awakened IoT endpoints.
Availability
MCP1811BT-033/LB is available at Aetrix Electronics and suitable for energy harvesting systems, wearable medical devices, and smart card security modules requiring stable component supply with guaranteed long-term availability.
Supply support for MCP1811BT-033/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 microcontrollers, analog components, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets since 1989.
The MCP1811/12 family was engineered specifically for ultra-low-power, battery-constrained applications - delivering industry-leading quiescent current while maintaining robust regulation, thermal performance, and ease of use in space-limited designs.
FAQ
What is the maximum input voltage rating for the MCP1811BT-033/LB?
The MCP1811BT-033/LB has an absolute maximum input voltage of +6.0V per its datasheet. However, for reliable continuous operation, the recommended input range is 1.8V to 5.5V. Exceeding 5.5V risks permanent damage even if within the absolute maximum rating, due to internal stress on the PMOS pass device and bandgap reference circuitry.
Does the MCP1811BT-033/LB include output discharge functionality?
No, the MCP1811BT-033/LB does not include output discharge. As indicated by the "B" suffix in its part number (per Table 1 of DS20006088C), it belongs to the MCP1811B variant, which omits the internal discharge transistor. This means VOUT remains floating or slowly decays via external load paths when SHDN is asserted.
Can the MCP1811BT-033/LB operate with a 1.0 µF ceramic output capacitor?
Yes, the MCP1811BT-033/LB is explicitly characterized and guaranteed stable with a minimum 1.0 µF X7R ceramic output capacitor, as confirmed in the "Stable with Ceramic Output Capacitor" feature list and AC/DC specifications table. No ESR requirements or additional compensation components are needed.
What is the thermal resistance (θJA) of the MCP1811BT-033/LB in its SOT-23 package?
The MCP1811BT-033/LB in the 3-Lead SOT-23 package has a typical junction-to-ambient thermal resistance (θJA) of 211.33°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard PCB layout practices - no thermal vias or copper pour enhancements.
How does the MCP1811BT-033/LB behave during startup from shutdown mode?
When released from shutdown (SHDN rising above 70% VIN), the MCP1811BT-033/LB exhibits a typical start-up rise time of 200–1000 µs to reach 95% of 3.3V output, with a start-up delay of ~400 µs from SHDN edge to VOUT crossing 10% of VR. No external soft-start circuitry is required.
MCP1811BT-033/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):
- 3.3V
- 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
MCP1811BT-033/LB FAQ
1.How can I place an order for MCP1811BT-033/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-033/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 MCP1811BT-033/LB reliable?
The price and inventory of MCP1811BT-033/LB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811BT-033/LB is usually 5 days.
3.What payment methods are accepted for MCP1811BT-033/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-033/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-033/LB?
MCP1811BT-033/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-033/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 MCP1811BT-033/LB?
For technical support, including MCP1811BT-033/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-033/LB requirements.
6.How does Aetrix verify that MCP1811BT-033/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-033/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 MCP1811BT-033/LB meets industry standards.
7.What is the process for return or replacement of MCP1811BT-033/LB?
All MCP1811BT-033/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-033/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 MCP1811BT-033/LB part is unused and in its original packaging.
Return procedure for MCP1811BT-033/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1811BT-033/LB Tags
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