Microchip Technology MCP1811BT-010/TT

Overview

MCP1811BT-010/TT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 1.0 V output, designed for energy-constrained systems requiring stable voltage under light-to-moderate load and deep sleep operation. 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 (MCP1811B variant), making it ideal for battery-powered wearable sensors and medical hearing aids.

For engineers reviewing the MCP1811BT-010/TT datasheet, MCP1811BT-010/TT pinout, MCP1811BT-010/TT application, or MCP1811BT-010/TT equivalent, key selection criteria include its 1.0 V fixed output, 150 mA capability, 400 mV typical dropout at full load, output discharge absence (B-series), and SOT-23-3 package compatibility with space- and power-sensitive PCB layouts.

Technical Context

The MCP1811BT-010/TT implements a PMOS pass transistor architecture enabling ultra-low IQ and fast start-up (400 µs typical from shutdown). Its feedback loop is internally compensated for stability with 1.0 µF ceramic output capacitance and exhibits ±25 mV load regulation over 1–150 mA at 1.0 V output.

As a member of the MCP1811B family, it omits the output discharge transistor present in 'A' variants-ensuring no intentional VOUT pull-down during SHDN assertion-while retaining overcurrent protection, thermal shutdown, and operation across –40°C to +85°C junction temperature range.

Key Specifications

Pinout & Package

Package: 3-Lead SOT-23 (SC-59), RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700T-1002E/TT and TN0101-1.0V, the MCP1811BT-010/TT provides optimal balance of ultra-low shutdown current (5 nA), compact SOT-23-3 footprint, and guaranteed 150 mA delivery at 1.0 V with minimal external components-making it preferred for space-constrained, intermittently active medical and sensing platforms.

Availability

MCP1811BT-010/TT is available at Aetrix Electronics and suitable for energy harvesting sensors, wearable health monitors, and smart card interfaces requiring stable component supply with long-term lifecycle assurance.

Supply support for MCP1811BT-010/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, analog, FPGA, and mixed-signal semiconductor solutions, headquartered in Chandler, Arizona.

The MCP1811 series belongs to Microchip's ultra-low-power LDO portfolio, engineered specifically for battery- and energy-harvesting–powered applications where nanoscale quiescent current and minimal external components are mandatory design constraints.

FAQ

What is the maximum input voltage rating for the MCP1811BT-010/TT?

The MCP1811BT-010/TT has an absolute maximum input voltage rating of +6.0 V. However, its specified operational input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate parametric guarantees-even briefly-so robust input clamping or pre-regulation is recommended if transient overvoltage events are possible in the target application.

Does the MCP1811BT-010/TT include output discharge functionality during shutdown?

No, the MCP1811BT-010/TT does not include output discharge. As a 'B'-suffix variant (MCP1811B), it omits the internal discharge transistor found in 'A'-suffix parts like MCP1811AT-010/TT. When SHDN is pulled low, VOUT remains floating and retains its voltage until discharged by external load or leakage-enabling faster wake-up and eliminating unintended reset conditions.

What output capacitor value and type are required for stable operation of the MCP1811BT-010/TT?

The MCP1811BT-010/TT requires a minimum 1.0 µF X7R ceramic capacitor on the VOUT pin for guaranteed stability. The capacitor must be placed as close as possible to the VOUT and GND pins. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR sensitivity and potential instability; multilayer ceramic capacitors (MLCCs) with ≥1.0 µF capacitance and 6.3 V or higher voltage rating are validated and preferred.

How does the dropout voltage of the MCP1811BT-010/TT behave under full load?

At 150 mA output current and +25°C, the MCP1811BT-010/TT exhibits a typical dropout voltage of 400 mV and a maximum of 600 mV. This means the input voltage must remain ≥1.4 V (1.0 V + 0.4 V) to sustain regulation. Dropout increases slightly at elevated temperatures and lower input voltages, so design margin should include worst-case 600 mV at –40°C to +85°C per datasheet Table 1.

Is the MCP1811BT-010/TT pin-compatible with other members of the MCP1811/1812 family in the same package?

Yes-the MCP1811BT-010/TT in SOT-23-3 shares identical pinout (VIN-GND-VOUT) with all other 3-lead variants in the MCP1811A/B and MCP1812A/B families, including different output voltages and current ratings. However, functional differences (e.g., presence/absence of output discharge, shutdown behavior) require firmware or schematic review before drop-in substitution.