Microchip Technology MCP1811BT-010/OT

Overview

MCP1811BT-010/OT from Microchip Technology is a 150 mA ultra-low quiescent current (250 nA typical) fixed-output 1.0 V low-dropout linear regulator in SOT-23-3 package, designed for energy harvesting and long-life battery-powered systems requiring stable voltage under microampere load conditions and shutdown current as low as 5 nA (MCP1811B variant).

For engineers reviewing the MCP1811BT-010/OT datasheet, MCP1811BT-010/OT pinout, MCP1811BT-010/OT application, or MCP1811BT-010/OT equivalent, this page delivers verified electrical specs, thermal performance data, ceramic-capacitor stability confirmation, shutdown behavior, and real-world use context for ultra-low-power embedded design validation.

Technical Context

The MCP1811BT-010/OT implements a PMOS pass transistor architecture enabling dropout voltage of 400 mV at 150 mA while maintaining 250 nA quiescent current across –40°C to +85°C junction temperature. Its internal reference and error amplifier deliver ±4% output voltage accuracy over line, load, and temperature.

It features active output discharge only in A-variant devices; the "B" suffix (as in MCP1811BT-010/OT) confirms no discharge transistor - SHDN asserts low to disable regulation with 5 nA typical supply current. The device operates stably with 1.0 µF X7R ceramic output capacitor and requires no input capacitor for basic operation.

Key Specifications

Pinout & Package

Package: 3-Lead SOT-23 (TO-236), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body, gull-wing leads, Pb-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B102MR-G and RP111N101D-TR-F, the MCP1811BT-010/OT uniquely combines 5 nA shutdown current, guaranteed 1.0 V ±4% accuracy over temperature, and full Microchip technical support - making it optimal for mission-critical, multi-decade battery applications where every nanoamp counts.

Availability

MCP1811BT-010/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, smart medical wearables, and long-life IoT sensors requiring stable component supply with guaranteed 10+ year lifecycle support.

Supply support for MCP1811BT-010/OT 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 since 1989.

The MCP1811X/12X product line was engineered specifically for ultra-low-power battery and energy-harvesting applications - prioritizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust thermal performance in miniature packages.

FAQ

What is the exact output voltage tolerance of the MCP1811BT-010/OT over temperature and load?

The MCP1811BT-010/OT delivers a nominal 1.0 V output with ±4% tolerance across –40°C to +85°C junction temperature, 1.8 V to 5.5 V input, and 0–150 mA load - confirmed in Table 1-1 of DS20006088C. This specification includes initial accuracy, line regulation (±20 mV), and load regulation (±25 mV) contributions.

Does the MCP1811BT-010/OT include an output discharge function during shutdown?

No, the MCP1811BT-010/OT does not include output discharge. The "B" suffix identifies it as the MCP1811B variant, which omits the discharge transistor (RDCH). When SHDN is pulled low, VOUT floats - preserving downstream capacitor charge and state, unlike the "A" variant (e.g., MCP1811AT-010/OT) that actively discharges VOUT.

What is the minimum output capacitance required for stability with the MCP1811BT-010/OT?

The MCP1811BT-010/OT requires a minimum 1.0 µF X7R ceramic capacitor on VOUT for guaranteed stability - explicitly stated in the Features and Electrical Characteristics sections of DS20006088C. Lower values risk oscillation; larger values improve PSRR but add cost and size.

Can the MCP1811BT-010/OT operate from a 1.5 V input source?

No - the MCP1811BT-010/OT has a minimum input voltage of 1.8 V per its Absolute Maximum Ratings and Electrical Characteristics tables. At 1.5 V input, the device will not regulate; output collapses to approximately VIN minus pass transistor drop, and internal circuitry may be unpowered or behave unpredictably.

How does the thermal performance of the MCP1811BT-010/OT compare in SOT-23-3 versus UDFN packages?

In the SOT-23-3 package, the MCP1811BT-010/OT has a θJA of 211.33°C/W on a JEDEC 4-layer board - significantly higher than the 4-lead 1×1 mm UDFN (θJA = 91.05°C/W). For 150 mA loads at 1.8 V input, SOT-23-3 junction rise exceeds 60°C above ambient, requiring careful thermal layout or derating; UDFN is preferred for high-power-density designs.