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Microchip Technology MCP1811BT-025/LT
- Part No.:
- MCP1811BT-025/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811BT-025/LT.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,039
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Product details
Overview
MCP1811BT-025/LT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 2.5 V output, 1.8–5.5 V input range, and shutdown capability (5 nA typical). It features output discharge during shutdown and stable operation with only 1.0 µF ceramic output capacitance - designed for energy harvesting, wearable electronics, and long-life battery-powered medical devices like hearing aids.
For engineers reviewing the MCP1811BT-025/LT datasheet, MCP1811BT-025/LT pinout, MCP1811BT-025/LT application, or MCP1811BT-025/LT equivalent, this page delivers verified electrical specs, package mapping to 3-lead SOT-23, thermal performance data, real-world load/line regulation behavior, and validated alternatives for ultra-low-power LDO selection.
Technical Context
The MCP1811BT-025/LT implements a CMOS-based LDO architecture optimized for sub-µA quiescent operation while maintaining tight output voltage regulation (±4% over temperature and load). Its internal error amplifier drives a PMOS pass transistor with integrated current limiting (250–420 mA typical), foldback protection, and a dedicated discharge switch active only in MCP1811A/12A variants.
This variant - identified by "BT" suffix and "/LT" package code - belongs to the MCP1811B family (no output discharge), confirming 5 nA shutdown current and compatibility with 3-lead SOT-23 packaging. It operates across –40°C to +85°C junction temperature with dropout voltage of 400–600 mV at 150 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% - ensures stable biasing for 2.5 V logic, ADC references, and low-voltage microcontrollers without external feedback. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices drawing µA-level sleep current. |
| Shutdown Current | 5 nA typical - reduces system standby power to negligible levels when paired with wake-on-interrupt architectures. |
| Max Output Current | 150 mA - supports moderate-current peripherals (sensors, BLE radios, display drivers) while retaining ultra-low IQ. |
| Input Voltage Range | 1.8 V to 5.5 V - accommodates single-cell Li-ion, multi-cell alkaline, and energy-harvested sources without pre-regulation. |
| Stable Output Capacitance | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum capacitors, reducing BOM cost and PCB area. |
| Dropout Voltage | 400–600 mV at 150 mA - enables regulation down to ~2.9 V input for 2.5 V output, critical for fading battery operation. |
Pinout & Package
Package: 3-Lead SOT-23 (standard JEDEC MO-178AA), surface-mount, RoHS-compliant, thermal resistance θJA = 211.33°C/W on 4-layer FR4 board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V unregulated input; requires local 1 µF ceramic bypass capacitor to minimize noise coupling. |
| VOUT | Regulated output | Delivers stable 2.5 V ±4%; connects directly to load and 1.0 µF ceramic output capacitor (X7R, ≥6.3 V rating). |
| GND | Ground reference | Low-impedance return path for regulator ground current only; must connect to quiet analog ground plane near output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 in always-on sensor nodes with 1-second wake cycles. |
| No output discharge (MCP1811B) | Prevents unintended discharge of downstream capacitors during shutdown - essential for preserving state in backup rails. |
| 1.0 µF ceramic stability | Eliminates ESR requirements and simplifies layout; avoids aging, leakage, and temperature drift issues of tantalum caps. |
| Overcurrent & thermal protection | Integrates foldback current limit (50 mA at 1 Ω load) and thermal shutdown to prevent damage during fault conditions. |
| PSRR >50 dB @ 1 kHz | Rejects switching noise from DC-DC converters or digital ICs, preserving signal integrity in mixed-signal sensor systems. |
Applications
| Energy Harvesting Systems | Wearable Medical Devices |
|---|---|
Use Scenario: Powering wireless environmental sensors powered by thermoelectric or piezoelectric harvesters delivering intermittent µW–mW output. IC Role / Device Role / Timing Role: Primary voltage regulator converting harvested energy into stable 2.5 V rail for ultra-low-power MCU and RF transceiver. Use Value: 250 nA quiescent current minimizes no-load loss, enabling startup from <2.0 V input and extending usable harvest window. |
Use Scenario: Hearing aids requiring continuous 2.4–2.6 V supply for analog front-end and DSP under strict battery life constraints. IC Role / Device Role / Timing Role: Main LDO supplying precision analog circuitry and low-noise ADC reference. Use Value: 169 µVrms output noise (10 Hz–100 kHz) and ±4% output accuracy ensure high-fidelity audio signal chain performance. |
| Smart Card Interfaces | Long-Life IoT Edge Nodes |
Use Scenario: Contactless smart cards powered via RF field, where input voltage varies widely (1.8–5.5 V) and peak current is brief. IC Role / Device Role / Timing Role: Regulator providing clean 2.5 V to secure microcontroller and EEPROM during transaction bursts. Use Value: Fast start-up rise time (200–1000 µs) and low line regulation (±20 mV) ensure reliable operation across full input range. |
Use Scenario: Industrial condition-monitoring nodes deployed in remote locations, powered by primary lithium batteries (e.g., AA/AAA). IC Role / Device Role / Timing Role: System power manager delivering regulated 2.5 V to MCU, accelerometer, and LoRaWAN transceiver. Use Value: 5 nA shutdown current extends shelf life and operational life beyond 15 years at average 10 µA system current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/MB | Same 2.5 V output, 250 nA IQ, but 250 mA max output and no shutdown pin - fixed-enable only. | Lacks SHDN control; unsuitable for systems requiring software-controlled power gating. | Select when shutdown functionality is unnecessary and higher output current margin is needed. |
| TPL720F25-DBVR | 2.5 V output, 350 nA IQ, 200 mA output, 5-pin SOT-23 package with enable and bypass pins. | Includes bypass capacitor option for enhanced PSRR; larger footprint and different pinout. | Choose when >50 dB PSRR up to 100 kHz is required and board space allows 5-pin layout. |
Compared with MCP1700T-2502E/MB and TPL720F25-DBVR, the MCP1811BT-025/LT uniquely combines 5 nA shutdown, 3-pin simplicity, and guaranteed 150 mA delivery at ultra-low IQ - making it optimal for space-constrained, intermittently active battery systems where every nanoamp counts.
Availability
MCP1811BT-025/LT is available at Aetrix Electronics and suitable for energy harvesting systems, wearable medical devices, and smart card interfaces requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1811BT-025/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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and development tools.
The MCP1811 family was engineered specifically for ultra-low-power, long-life battery and energy-harvesting applications - prioritizing nanoscale quiescent current, minimal external components, and robust operation across wide input and temperature ranges.
FAQ
What is the maximum input voltage rating for the MCP1811BT-025/LT?
The MCP1811BT-025/LT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V violates the recommended operating conditions and risks permanent damage. For reliable long-term use, VIN must remain within 1.8 V to 5.5 V per the datasheet's electrical specifications table.
Does the MCP1811BT-025/LT include output discharge functionality during shutdown?
No, the MCP1811BT-025/LT does not include output discharge. The "B" in its part number identifies it as an MCP1811B variant, which omits the discharge transistor (RDCH ≈ open) present in MCP1811A devices. This preserves downstream capacitor charge during SHDN assertion - critical for retaining state in backup domains.
What is the minimum output capacitance required for stability with the MCP1811BT-025/LT?
The MCP1811BT-025/LT requires a minimum of 1.0 µF X7R ceramic output capacitor for guaranteed stability. This value is specified in the datasheet's "Stable with Ceramic Output Capacitor" feature and confirmed in AC/DC characteristics tables. Using lower values may cause oscillation or poor transient response.
Can the MCP1811BT-025/LT operate reliably at –40°C ambient temperature?
Yes, the MCP1811BT-025/LT is fully specified for operation across –40°C to +85°C junction temperature. Its electrical parameters - including output voltage accuracy (±4%), dropout voltage, and quiescent current - are tested and guaranteed over this full industrial temperature range per DS20006088C-page 6.
What thermal resistance applies to the MCP1811BT-025/LT in its 3-lead SOT-23 package?
The MCP1811BT-025/LT in 3-lead SOT-23 exhibits θJA = 211.33°C/W and θJC(Top) = 138.72°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. These values are critical for calculating junction temperature rise under load and ensuring operation remains within the +125°C absolute maximum rating.
MCP1811BT-025/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):
- 2.5V
- 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-025/LT FAQ
1.How can I place an order for MCP1811BT-025/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-025/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-025/LT reliable?
The price and inventory of MCP1811BT-025/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-025/LT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-025/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-025/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-025/LT?
MCP1811BT-025/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-025/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-025/LT?
For technical support, including MCP1811BT-025/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-025/LT requirements.
6.How does Aetrix verify that MCP1811BT-025/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-025/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-025/LT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-025/LT?
All MCP1811BT-025/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-025/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-025/LT part is unused and in its original packaging.
Return procedure for MCP1811BT-025/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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