Microchip Technology MCP1811BT-030/OT

Overview

MCP1811BT-030/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 3.0V output, designed for energy-constrained battery-powered systems. It operates from 1.8V to 5.5V input, supports ceramic output capacitors as small as 1.0 µF, and features overcurrent protection and shutdown mode with 5 nA typical supply current - ideal for wearable electronics and medical hearing aids.

For engineers reviewing the MCP1811BT-030/OT datasheet, MCP1811BT-030/OT pinout, MCP1811BT-030/OT application, or MCP1811BT-030/OT equivalent, this page delivers verified technical context, package mapping, real-world use cases, and validated alternative options aligned with Microchip's MCP1811X family specifications.

Technical Context

The MCP1811BT-030/OT belongs to the MCP1811B variant group: it provides 150 mA output current, no output discharge function (unlike MCP1811A), and achieves 5 nA typical shutdown current. Its LDO architecture maintains regulation down to a 400 mV dropout at full load (150 mA), enabling operation near battery end-of-life in single-cell Li-ion or alkaline systems.

Stability is guaranteed with ≥1.0 µF X7R ceramic output capacitance and requires no external compensation. The device uses internal error amplification and current-limiting circuitry, with thermal shutdown protection and foldback current limiting (50 mA at R_LOAD = 1 Ω) to safeguard against sustained overload conditions.

Key Specifications

Pinout & Package

Package: 3-Lead SOT-23 - surface-mount, 2.92 mm × 1.3 mm footprint, JEDEC standard, suitable for high-density portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1811BT-030/OT, MCP1811AT-300/OT adds output discharge at the cost of higher shutdown current, while TPL7407LDR trades ultra-low IQ for integrated switching - neither is pin-compatible, but both serve adjacent low-power system roles.

Availability

MCP1811BT-030/OT is available at Aetrix Electronics and suitable for wearable electronics, medical hearing aids, and energy-harvesting sensor nodes requiring stable component supply across long production lifecycles.

Supply support for MCP1811BT-030/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 is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona.

The MCP1811X family was engineered specifically for ultra-long-life, battery-operated applications demanding sub-µA quiescent current and ceramic-capacitor compatibility - targeting wearables, smart cards, and energy-harvesting systems.

FAQ

What is the maximum output current capability of the MCP1811BT-030/OT?

The MCP1811BT-030/OT delivers up to 150 mA continuous output current. This is confirmed in Table 1 of DS20006088C, which identifies MCP1811X devices (including MCP1811BT-030/OT) as 150 mA variants. Current limit is specified at 250 mA typical, with foldback protection engaging at 50 mA under short-circuit conditions.

Does the MCP1811BT-030/OT include an output discharge function?

No, the MCP1811BT-030/OT does not include output discharge. Per Table 1 and Section 1.0 of DS20006088C, the "B" suffix denotes the no-discharge variant (MCP1811B). Only MCP1811A/12A parts integrate the discharge transistor (RDCH ≈ 100 Ω). This makes MCP1811BT-030/OT appropriate for systems where VOUT must remain floating during shutdown.

Which package type is used by the MCP1811BT-030/OT?

The MCP1811BT-030/OT uses the 3-Lead SOT-23 package, as indicated by the "/OT" suffix per Microchip's ordering information guide. This matches the mechanical dimensions and pinout shown in Figure 2-1 (DS20006088C, page 2), with VIN, GND, and VOUT on pins 1, 2, and 3 respectively.

What is the minimum input voltage required for regulation at 3.0 V output?

The MCP1811BT-030/OT requires a minimum input voltage of 1.8 V for loads ≤50 mA, and ≥2.0 V for loads up to 150 mA (per Electrical Characteristics table, page 4). At full 150 mA load, the 400 mV typical dropout means VIN must be ≥3.4 V to maintain regulation - verified by Figure 2-5 and Figure 2-11.

Can the MCP1811BT-030/OT operate with a 1.0 µF ceramic output capacitor?

Yes - the MCP1811BT-030/OT is explicitly characterized and guaranteed stable with a 1.0 µF X7R ceramic output capacitor, as stated in the Features section and confirmed in Section 4.2 of DS20006088C. This eliminates ESR requirements and simplifies design versus traditional tantalum-based LDOs.