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Microchip Technology MCP1811BT-018/LT
- Part No.:
- MCP1811BT-018/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811BT-018/LT.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,575
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Product details
Overview
MCP1811BT-018/LT from Microchip Technology is an ultra-low quiescent current (250 nA typical), 150 mA low-dropout linear regulator with fixed 1.8 V output, designed for energy-constrained systems requiring long battery life and stable low-voltage supply. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features overcurrent protection and output discharge during shutdown.
For engineers reviewing the MCP1811BT-018/LT datasheet, MCP1811BT-018/LT pinout, MCP1811BT-018/LT application, or MCP1811BT-018/LT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases in wearable and medical electronics, and validated alternative options for ultra-low-power LDO selection.
Technical Context
The MCP1811BT-018/LT belongs to the MCP1811B variant - a shutdown-capable LDO without output discharge, delivering 150 mA output current with 5 nA typical shutdown supply current. Its internal architecture enables stable regulation down to 1.8 V output while maintaining sub-µA quiescent operation across –40°C to +85°C junction temperature.
It uses a PMOS pass transistor topology optimized for low dropout (400 mV typical at 150 mA) and high PSRR (–50 dB at 1 kHz), and is explicitly characterized for stability with 1.0 µF X7R ceramic output capacitance - eliminating need for bulk electrolytic or tantalum capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures compatibility with 1.8 V logic rails and low-voltage microcontrollers. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-mode-dominated applications like wearables. |
| Shutdown Current | 5 nA typical - minimizes leakage when system is powered off, critical for energy harvesting nodes. |
| Max Output Current | 150 mA - sufficient for powering RF transceivers, sensors, and ultra-low-power MCUs (e.g., PIC XLP). |
| Input Voltage Range | 1.8 V to 5.5 V - supports direct connection to single-cell Li-ion, LiFePO₄, or multi-cell alkaline sources. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation from 2.2 V input, extending usable battery voltage range. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - reduces BOM cost/size and improves noise performance vs. larger electrolytics. |
Pinout & Package
Package: 3-Lead SOT-23 (SC70-compatible footprint). Thermal resistance θJA = 211.33°C/W on JEDEC 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled with ≥0.1 µF ceramic capacitor near pin. |
| VOUT | Regulated output | Delivers stable 1.8 V; requires ≥1.0 µF X7R ceramic capacitor directly at pin for stability. |
| GND | Ground reference | Low-impedance return path; tie to quiet ground plane or output capacitor cathode to minimize noise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical - enables >10-year battery life in devices drawing <1 µA average current. |
| No output discharge | Eliminates reverse current path during shutdown - preserves charge on downstream capacitors. |
| Ceramic capacitor stability | Stable with 1.0 µF X7R - avoids ESR dependency and simplifies layout in space-constrained PCBs. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) - prevents thermal runaway under short-circuit. |
| Wide temperature range | –40°C to +85°C operating junction - qualified for industrial and medical environments. |
Applications
| Energy Harvesting Node | Smart Wearable Sensor |
|---|---|
Use Scenario: Powering wireless sensor node powered by thermoelectric or piezoelectric harvester with intermittent µW-level output. IC Role / Device Role / Timing Role: Primary voltage regulator converting harvested energy into stable 1.8 V rail for MCU and BLE radio. Use Value: 5 nA shutdown current prevents harvester energy loss during idle; 1.0 µF capacitor minimizes startup voltage threshold. |
Use Scenario: Continuous heart-rate monitoring in wrist-worn device using coin-cell battery. IC Role / Device Role / Timing Role: Supplies 1.8 V to ultra-low-power MCU and optical sensor during active and deep-sleep cycles. Use Value: 250 nA quiescent current extends battery life beyond 2 years; SOT-23 footprint fits tight wearable form factor. |
| Hearing Aid Front-End | Secure Smart Card |
Use Scenario: Powering analog front-end and DSP in Class I hearing aid with rechargeable micro-battery. IC Role / Device Role / Timing Role: Low-noise 1.8 V supply for microphone preamp and ADC, minimizing audible hiss. Use Value: High PSRR (–50 dB @ 1 kHz) rejects switching noise from nearby DC-DC converters; low dropout preserves runtime. |
Use Scenario: Embedded secure element in contactless payment card with strict power budget. IC Role / Device Role / Timing Role: Regulates 1.8 V core voltage for cryptographic processor during NFC field-powered operation. Use Value: Guaranteed start-up from 1.8 V input enables reliable operation even at end-of-battery-life; no output discharge maintains state integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6209B182MR-G | 150 mA, 1.8 V, 250 nA IQ, but no shutdown control; SOT-23-5 package (5-pin vs. 3-pin) | Lacks enable/shutdown functionality - unsuitable where system-level power gating is required. | Select only if shutdown is unnecessary and PCB layout accommodates extra pin and larger footprint. |
| Ricoh RP111N181D-TR-F | 200 mA, 1.8 V, 300 nA IQ, 1.0 µF stable, but 10 nA shutdown current (vs. 5 nA for MCP1811BT-018/LT) | Slightly higher shutdown leakage may impact multi-year energy harvesting deployments. | Prefer when higher output current headroom is needed and 5 nA shutdown is not critical. |
Compared with XC6209B182MR-G and RP111N181D-TR-F, the MCP1811BT-018/LT uniquely combines true 3-pin simplicity, 5 nA shutdown, and guaranteed 1.8 V regulation from 1.8 V input - making it optimal for minimal-footprint, ultra-long-life battery and energy-harvesting designs.
Availability
MCP1811BT-018/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and secure smart cards requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811BT-018/LT 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 is a leading provider of microcontroller, analog, and FPGA solutions, with broad expertise in ultra-low-power design and mixed-signal integration.
The MCP1811 family was engineered specifically for battery- and energy-harvesting–powered applications demanding nanowatt quiescent operation, minimal external components, and robust performance across temperature and load variation.
FAQ
What is the minimum input voltage required for stable operation of the MCP1811BT-018/LT?
The MCP1811BT-018/LT requires VIN ≥ 1.8 V for operation, and its dropout voltage is 400 mV typical at 150 mA load - meaning stable 1.8 V output is maintained down to VIN = 2.2 V under full load. At lighter loads, regulation begins as low as VIN = 1.8 V, per datasheet Section 1.0.
Does the MCP1811BT-018/LT include output discharge during shutdown?
No. The MCP1811BT-018/LT belongs to the MCP1811B variant, which omits the output discharge transistor. This means VOUT remains floating or holds residual charge after SHDN assertion - preserving state in downstream circuits but requiring external discharge if needed.
Which output capacitor value and type are required for stability with the MCP1811BT-018/LT?
The MCP1811BT-018/LT is stable with a minimum 1.0 µF X7R ceramic capacitor placed directly at the VOUT pin. Tantalum or aluminum electrolytic capacitors are not required or recommended - the device's internal compensation is optimized for low-ESR ceramics.
What is the thermal performance of the MCP1811BT-018/LT in the SOT-23 package?
In the 3-Lead SOT-23 package, the MCP1811BT-018/LT has θJA = 211.33°C/W on a JEDEC-standard 4-layer FR4 board. At 150 mA load and 5.5 V input, worst-case power dissipation is ~555 mW, resulting in ~117°C junction rise above ambient - confirming derating is required above 25°C ambient for continuous full-load operation.
Is the MCP1811BT-018/LT compatible with Microchip's XLP microcontrollers?
Yes. The MCP1811BT-018/LT was co-designed with Microchip's eXtreme Low-Power (XLP) MCU portfolio. Its 250 nA quiescent current, 1.8 V output, and fast wake-up from shutdown align precisely with XLP sleep/wake profiles - enabling seamless integration in battery-optimized PIC and AVR-based systems.
MCP1811BT-018/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 1.8V
- 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-70-5
MCP1811BT-018/LT FAQ
1.How can I place an order for MCP1811BT-018/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-018/LT 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-018/LT reliable?
The price and inventory of MCP1811BT-018/LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811BT-018/LT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-018/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-018/LT transactions.
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4.How is shipping managed for MCP1811BT-018/LT?
MCP1811BT-018/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-018/LT 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-018/LT?
For technical support, including MCP1811BT-018/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-018/LT requirements.
6.How does Aetrix verify that MCP1811BT-018/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-018/LT 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-018/LT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-018/LT?
All MCP1811BT-018/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-018/LT, 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-018/LT part is unused and in its original packaging.
Return procedure for MCP1811BT-018/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1811BT-018/LT Tags
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