Microchip Technology MCP1812BT-020/LT

Overview

MCP1812BT-020/LT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) low-dropout linear regulator with fixed 2.0 V output, stable with 2.2 µF ceramic output capacitor, and shutdown capability (5 nA typical). It operates from 1.8 V to 5.5 V input and delivers regulated power for energy harvesting nodes and wearable medical sensors requiring multi-year battery life.

For engineers reviewing the MCP1812BT-020/LT datasheet, MCP1812BT-020/LT pinout, MCP1812BT-020/LT application, or MCP1812BT-020/LT equivalent, this page provides verified electrical specifications, package mapping to 3-lead SOT-23, functional pin roles, real-world use cases in ultra-low-power systems, and two validated alternative parts with documented differences in output discharge and shutdown current.

Technical Context

The MCP1812BT-020/LT belongs to the MCP1812B variant - distinguished by absence of output discharge during shutdown and 5 nA typical shutdown current. Its LDO architecture maintains regulation down to 400 mV dropout at 300 mA load, enabling operation from single-cell Li-ion or alkaline sources.

It uses internal error amplification and current-limit protection (500–840 mA foldback), supports dynamic load steps up to 300 mA with ≤100 mV transient deviation, and achieves –50 dB PSRR at 1 kHz without input capacitor - critical for noise-sensitive analog front-ends in hearing aids and smart wearables.

Key Specifications

Pinout & Package

Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA compliant, thermal resistance θ_JA = 211.33°C/W on standard 4-layer FR4 board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1812AT-020/LT, the MCP1812BT-020/LT trades output discharge for 5× lower shutdown current - critical for intermittent-sensing applications. Versus TPL7407LDR, it offers 4× lower IQ and guaranteed 2.0 V accuracy but no integrated driver functionality, making it superior for dedicated ultra-low-power regulation.

Availability

MCP1812BT-020/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card readers requiring stable component supply with long-term lifecycle assurance.

Supply support for MCP1812BT-020/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 microcontrollers, analog components, and connectivity solutions, headquartered in Chandler, Arizona.

The MCP1811/12 family was designed specifically for ultra-low-power battery-operated systems - emphasizing nanoscale quiescent current, ceramic-capacitor stability, and minimal footprint to enable next-generation IoT edge nodes and medical wearables.

FAQ

What is the output voltage tolerance of the MCP1812BT-020/LT?

The MCP1812BT-020/LT has a fixed 2.0 V output with ±4% tolerance over temperature (–40°C to +85°C) and load (0–300 mA), measured per DS20006088C Section 1.0 AC/DC Characteristics. This ensures reliable operation for 2.0 V I/O interfaces and precision analog circuits without external feedback adjustment.

Does the MCP1812BT-020/LT require an input capacitor?

The MCP1812BT-020/LT does not require an input capacitor for stability, as confirmed in DS20006088C Figure 2-16–2-19 PSRR plots and Section 4.1 "Input Capacitor." However, a 1 µF ceramic capacitor placed close to the VIN pin is recommended to suppress high-frequency noise and improve transient response during load steps.

What is the thermal performance of the MCP1812BT-020/LT in SOT-23 package?

In the 3-lead SOT-23 package, the MCP1812BT-020/LT has a junction-to-ambient thermal resistance (θ_JA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board. At 300 mA load with 2.4 V input (400 mV dropout), power dissipation is ~120 mW, resulting in ~25°C junction rise above ambient - well within the +85°C max operating limit.

How does the MCP1812BT-020/LT behave during startup from shutdown?

When enabled via SHDN pin (rising above 70% VIN), the MCP1812BT-020/LT exhibits a typical start-up delay of 400 µs and rise time of 200–1000 µs to reach 95% of 2.0 V output, as specified in DS20006088C Table 1. No output discharge occurs during this transition, preserving downstream capacitor charge.

Is the MCP1812BT-020/LT compatible with ceramic output capacitors below 2.2 µF?

No - the MCP1812BT-020/LT requires a minimum 2.2 µF X7R ceramic output capacitor for guaranteed stability, as stated in DS20006088C Section 1.0 and Figure 2-5–2-8. Using smaller values risks oscillation under load transients, especially at temperatures near –40°C or +85°C.