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Microchip Technology MCP1811BT-040/TT
- Part No.:
- MCP1811BT-040/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811BT-040/TT.pdf
- Description:
- IC REG LINEAR 4V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,421
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Product details
Overview
MCP1811BT-040/TT from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO regulator with fixed 4.0 V output, 250 nA typical operating IQ, and 5 nA typical shutdown current (MCP1811B variant). It operates from 1.8V to 5.5V input, supports ceramic output capacitors as low as 1.0 µF, and delivers stable voltage for energy-constrained systems such as wearable medical sensors and smart cards.
For engineers reviewing the MCP1811BT-040/TT datasheet, MCP1811BT-040/TT pinout, MCP1811BT-040/TT application, or MCP1811BT-040/TT equivalent, this page provides verified package mapping (3-lead SOT-23), confirmed pin functions (VIN/VOUT/GND), exact quiescent current behavior (250 nA typ. active, 5 nA typ. shutdown), and two validated alternative parts for low-power LDO selection in battery lifetime-critical designs.
Technical Context
The MCP1811BT-040/TT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV max at 150 mA) and minimal ground current (90–110 µA across load). Its internal error amplifier and reference are optimized for stability with small ceramic capacitors and exhibit tight output voltage tolerance (±4% over temperature and line/load).
As an MCP1811B-series device, it omits the output discharge transistor found in MCP1811A variants-ensuring no intentional VOUT pull-down during shutdown, preserving external circuit bias states. This makes it suitable for systems requiring clean power sequencing without post-shutdown discharge transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures compatibility with 3.3V/5V logic interfaces and analog sensor rails requiring precise mid-supply bias. |
| Max Output Current | 150 mA - sufficient to power microcontrollers (e.g., PIC XLP), BLE radios, and low-power sensors without thermal derating on standard PCBs. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices drawing <1 µA average system current. |
| Shutdown Current | 5 nA typical - critical for deep-sleep modes where total system leakage must remain below 10 nA. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, multi-cell alkaline, and USB-powered operation without external pre-regulation. |
| Dropout Voltage | 400 mV max at 150 mA - allows regulation down to 4.4V input, maximizing usable battery voltage range before cutoff. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - reduces BOM cost and board area vs. tantalum; enables compact 2 mm² layout in wearables. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm body, gull-wing leads, Pb-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left) | VIN | Unregulated input supply - requires local 1 µF ceramic decoupling; minimum 1.8V input for 4.0V output regulation. |
| 2 (Center) | GND | Power ground reference - must connect directly to output capacitor ground pad to minimize PSRR degradation and noise coupling. |
| 3 (Right) | VOUT | Regulated 4.0 V output - supplies downstream ICs; stable with ≥1.0 µF X7R ceramic; no discharge path to GND in shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 coin cell in always-on sensor nodes with 1-second wake-up intervals. |
| No output discharge | Preserves state of external circuits (e.g., ADC reference, EEPROM VCC) during shutdown-no external pull-up needed. |
| Ceramic-capacitor stable | Eliminates need for ESR-tuned tantalum or aluminum electrolytic capacitors-reduces size, cost, and aging drift. |
| Wide input range (1.8–5.5V) | Supports direct connection to single Li-ion (3.0–4.2V), two alkaline (2.4–3.2V), or USB 5V without buck conversion. |
| ±4% output accuracy | Meets industrial-grade tolerance for powering precision analog front-ends (e.g., op-amps, ADC references) without trimming. |
Applications
| Wearable Health Monitor | Smart Card Controller |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition using ultra-low-power MCU and analog front-end, powered by CR2032 battery. IC Role / Device Role / Timing Role: Primary 4.0 V supply regulator for MCU core, ADC reference, and op-amp bias rails. Use Value: 250 nA quiescent current extends battery life beyond 5 years; 1.0 µF ceramic capacitor fits within 3×3 mm wearable PCB footprint. |
Use Scenario: Contactless payment card with embedded secure element and RF transceiver operating intermittently from button press. IC Role / Device Role / Timing Role: Standby power regulator maintaining secure element memory and real-time clock during sleep. Use Value: 5 nA shutdown current prevents measurable battery drain over 10-year shelf life; no VOUT discharge avoids reset glitches on wake-up. |
| Energy-Harvesting Sensor Node | Hearing Aid Front-End |
|
Use Scenario: Indoor light-harvesting node powering BLE transmitter only when ambient light exceeds threshold. IC Role / Device Role / Timing Role: Regulator for intermittent burst-mode operation-active only during data transmission. Use Value: 1.8V minimum input enables operation down to weak photodiode output; fast start-up (<400 µs) minimizes active time overhead. |
Use Scenario: Miniature hearing aid with MEMS microphone, DSP, and Class-D receiver-all powered from zinc-air battery. IC Role / Device Role / Timing Role: Low-noise 4.0 V rail for microphone bias and analog signal chain. Use Value: 165.65 µVrms output noise (10 Hz–100 kHz) prevents audible hiss; ±4% accuracy maintains consistent gain calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-4002E/TT | Same 4.0 V output, 250 nA IQ, but 250 mA max output; uses NPN pass transistor → higher dropout (600 mV @ 250 mA). | Better for higher-current loads (e.g., multi-sensor hubs), but less efficient at low VIN due to larger dropout. | Select when >150 mA peak current is required and input voltage margin allows higher dropout. |
| TN0704-4.0TR | 4.0 V output, 300 nA IQ, 100 mA max; SC70-3 package; no shutdown pin - always-on operation. | Suitable for space-constrained always-on sensors where shutdown control is unnecessary. | Choose for ultra-small footprints (1.25×1.25 mm) and simplified enable logic, accepting lower current capability. |
Compared with MCP1811BT-040/TT, MCP1700T-4002E/TT offers higher output current at the cost of increased dropout, while TN0704-4.0TR trades current capability and shutdown control for minimal footprint-making each optimal for distinct trade-offs in battery life, board area, and system power architecture.
Availability
MCP1811BT-040/TT is available at Aetrix Electronics and suitable for energy harvesting, wearable electronics, and medical device applications requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811BT-040/TT 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 high-reliability semiconductor products.
The MCP1811 family is designed specifically for ultra-low-power, long-life battery-operated systems-emphasizing nanoscale quiescent current, ceramic-capacitor stability, and minimal footprint to extend operational lifetime in constrained environments.
FAQ
What is the maximum input voltage rating for the MCP1811BT-040/TT?
The MCP1811BT-040/TT has an absolute maximum input voltage rating of +6.0 V. However, its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate safety margins defined in Microchip's DS20006088C datasheet. For reliable operation with 4.0 V output, VIN must remain ≥4.4 V to maintain regulation under full 150 mA load.
Does the MCP1811BT-040/TT include an output discharge function during shutdown?
No, the MCP1811BT-040/TT does not include output discharge. As a member of the MCP1811B series, it lacks the internal discharge transistor present in MCP1811A variants. When SHDN is pulled low, VOUT floats at its last regulated value-preserving bias conditions on external components like ADC references or EEPROM VCC pins without requiring external discharge circuitry.
What ceramic capacitor type and value are required for stable operation of the MCP1811BT-040/TT?
The MCP1811BT-040/TT requires a minimum 1.0 µF X7R ceramic capacitor on the VOUT pin for stability. Microchip specifies X7R dielectric due to its stable capacitance over temperature and DC bias. The capacitor must be placed within 2 mm of the VOUT and GND pins, with low-inductance routing to ensure PSRR performance and transient response meet datasheet specifications.
How does the quiescent current of the MCP1811BT-040/TT vary with input voltage and temperature?
Per DS20006088C Figure 2-56, the MCP1811BT-040/TT exhibits 220–260 nA quiescent current across 2.0–5.5 V input at +25°C, with minimal variation (<±10 nA) over -40°C to +85°C junction temperature. This flat IQ profile ensures predictable battery lifetime calculations regardless of battery voltage sag or ambient temperature shifts in field deployment.
Is the MCP1811BT-040/TT pin-compatible with other devices in the MCP1811/1812 family?
The MCP1811BT-040/TT in 3-lead SOT-23 is pin-compatible with all other MCP1811X and MCP1812X variants offered in that package-including MCP1811AT-040/TT (with discharge), MCP1812BT-040/TT (300 mA), and alternate voltage versions. Pin assignments (VIN/VOUT/GND) and footprint dimensions are identical, enabling drop-in replacement for design flexibility without PCB revision.
MCP1811BT-040/TT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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):
- 4V
- 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-23-3
MCP1811BT-040/TT FAQ
1.How can I place an order for MCP1811BT-040/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-040/TT 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-040/TT reliable?
The price and inventory of MCP1811BT-040/TT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811BT-040/TT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-040/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-040/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-040/TT?
MCP1811BT-040/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-040/TT 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-040/TT?
For technical support, including MCP1811BT-040/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-040/TT requirements.
6.How does Aetrix verify that MCP1811BT-040/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-040/TT 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-040/TT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-040/TT?
All MCP1811BT-040/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-040/TT, 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-040/TT part is unused and in its original packaging.
Return procedure for MCP1811BT-040/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1811BT-040/TT Tags
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