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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Microchip Technology MCP1812BT-018/TT

Name: MCP1812BT-018/TT
Brand: Microchip Technology
SKU: MCP1812BT-018/TT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1812BT-018/TT

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MCP1812BT-018/TT.pdf

Description:: IC REG LINEAR 1.8V 300MA SOT23-3

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Product details

Overview

MCP1812BT-018/TT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 1.8 V output LDO regulator in 3-lead SOT-23 package, designed for energy harvesting and long-life battery-powered systems requiring stable low-noise voltage regulation with ceramic capacitor support (2.2 µF min).

For engineers reviewing the MCP1812BT-018/TT datasheet, MCP1812BT-018/TT pinout, MCP1812BT-018/TT application, or MCP1812BT-018/TT equivalent, key selection criteria include shutdown current (5 nA typical), dropout voltage (400 mV at 300 mA), thermal performance in SOT-23 (θ_JA = 211.33°C/W), and compatibility with micro-power MCUs in wearable and medical devices.

Technical Context

The MCP1812BT-018/TT implements a PMOS pass transistor architecture enabling ultra-low IQ operation and fast start-up (400 µs delay from SHDN). Its internal error amplifier and reference maintain ±4% output accuracy over -40°C to +85°C junction temperature while supporting dynamic load steps up to 300 mA with <100 mV transient deviation.

It integrates overcurrent protection with foldback limiting (100 mA at R_LOAD = 1 Ω) and an active discharge transistor (R_DCH = 100 Ω) that pulls VOUT to GND during shutdown-confirmed for MCP1812A variants including this part number suffix "T" indicating output discharge capability.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8 V ±4% - ensures stable core voltage for 1.8 V logic and RF subsystems without external feedback.
Max Output Current	300 mA - supports higher-current peripherals like BLE radios or sensor arrays in compact wearables.
Quiescent Current	250 nA typical - enables multi-year battery life in sleep-mode-dominated applications (e.g., coin-cell-powered sensors).
Shutdown Current	5 nA typical - critical for zero-power wake-on-event architectures using external interrupt controllers.
Dropout Voltage	400 mV at 300 mA - allows operation down to VIN = 2.2 V, extending usable battery range in single-cell Li-ion or alkaline systems.
Stability Capacitor	2.2 µF ceramic (X7R) - reduces solution size/cost vs. tantalum; enables low-noise (<223 µV_rms) analog supply rails.
PSRR	-50 dB @ 1 kHz - suppresses switching noise from DC-DC converters sharing input rail in mixed-signal designs.

Pinout & Package

Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm body, no exposed pad.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Input voltage supply	Accepts 1.8–5.5 V; minimum 2.4 V required for full 300 mA output at 1.8 V due to dropout.
VOUT	Regulated output	Delivers fixed 1.8 V; requires ≥2.2 µF X7R ceramic capacitor placed adjacent to pin for stability.
GND	Ground reference	Low-impedance return path for load and ground current (≤220 µA max at 300 mA); tie directly to output capacitor ground.

Key Features

Feature	Design Value
Ultra-low IQ operation	250 nA typical enables >10-year shelf life on CR2032 in intermittent-sensing nodes.
Active output discharge	100 Ω discharge transistor clears VOUT within microseconds upon SHDN assertion-prevents back-powering of upstream circuitry.
Ceramic capacitor stability	Validated with 2.2 µF X7R ceramics only-eliminates ESR requirements and simplifies layout vs. electrolytic/tantalum alternatives.
Thermal robustness	Rated for continuous operation at TJ ≤ +85°C; thermal resistance θ_JA = 211.33°C/W on standard 4-layer FR4 board.
Load transient response	≤100 mV undershoot/overshoot for 100 µA ↔ 300 mA step-maintains MCU core voltage integrity during burst transmissions.

Applications

Energy Harvesting Node	Wearable Health Monitor
Use Scenario: Indoor light or thermal gradient harvester powering a wireless sensor node with intermittent 10-second wake cycles. IC Role / Device Role / Timing Role: Primary power regulator converting harvested microwatt-level DC into stable 1.8 V for ultra-low-power MCU and sub-GHz transceiver. Use Value: 5 nA shutdown current extends operational lifetime beyond 15 years on a single charge of a 10 mAh thin-film battery.	Use Scenario: Compact wrist-worn pulse oximeter logging SpO₂ every 30 seconds with Bluetooth LE broadcast. IC Role / Device Role / Timing Role: Core voltage regulator for ARM Cortex-M0+ MCU and analog front-end ADC, synchronized to measurement timing. Use Value: 223 µV_rms output noise prevents quantization errors in 16-bit biomedical ADC readings.
Hearing Aid Processor	Smart Card Security Module
Use Scenario: Rechargeable hearing aid with voice-activated processing and adaptive noise cancellation. IC Role / Device Role / Timing Role: Low-noise bias supply for MEMS microphone preamp and DSP core, active during audio capture windows. Use Value: 400 mV dropout enables full 300 mA peak current delivery even as battery discharges from 3.6 V to 2.2 V.	Use Scenario: Contactless payment card with embedded secure element and NFC interface operating from harvested RF energy. IC Role / Device Role / Timing Role: Standby regulator maintaining secure element SRAM retention voltage during RF field absence. Use Value: 250 nA quiescent current ensures >5-year data retention on internal supercapacitor without recharge.

Energy Harvesting Node

Wearable Health Monitor

Use Scenario: Indoor light or thermal gradient harvester powering a wireless sensor node with intermittent 10-second wake cycles.

IC Role / Device Role / Timing Role: Primary power regulator converting harvested microwatt-level DC into stable 1.8 V for ultra-low-power MCU and sub-GHz transceiver.

Use Value: 5 nA shutdown current extends operational lifetime beyond 15 years on a single charge of a 10 mAh thin-film battery.

Use Scenario: Compact wrist-worn pulse oximeter logging SpO₂ every 30 seconds with Bluetooth LE broadcast.

IC Role / Device Role / Timing Role: Core voltage regulator for ARM Cortex-M0+ MCU and analog front-end ADC, synchronized to measurement timing.

Use Value: 223 µV_rms output noise prevents quantization errors in 16-bit biomedical ADC readings.

Hearing Aid Processor

Smart Card Security Module

Use Scenario: Rechargeable hearing aid with voice-activated processing and adaptive noise cancellation.

IC Role / Device Role / Timing Role: Low-noise bias supply for MEMS microphone preamp and DSP core, active during audio capture windows.

Use Value: 400 mV dropout enables full 300 mA peak current delivery even as battery discharges from 3.6 V to 2.2 V.

Use Scenario: Contactless payment card with embedded secure element and NFC interface operating from harvested RF energy.

IC Role / Device Role / Timing Role: Standby regulator maintaining secure element SRAM retention voltage during RF field absence.

Use Value: 250 nA quiescent current ensures >5-year data retention on internal supercapacitor without recharge.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1812-1802E/MB	Same 1.8 V output, 300 mA rating, and 5 nA shutdown current-but in 4-lead 1×1 mm UDFN with exposed thermal pad (θ_JA = 91.05°C/W).	Better thermal performance for high ambient temperature (>60°C) or sustained 300 mA loads; requires rework of PCB footprint and solder stencil.	Select when thermal headroom is constrained and board space permits UDFN layout.
Torex XC6210B182MR-G	1.8 V, 300 mA, 250 nA IQ, but no output discharge; shutdown current 10 nA (vs. 5 nA); PSRR -45 dB @ 1 kHz.	Lacks active VOUT discharge-requires external circuitry if back-powering must be avoided during shutdown.	Choose where discharge function is unnecessary and cost sensitivity outweighs thermal or noise advantages.

Compared with MCP1812-1802E/MB, the MCP1812BT-018/TT offers identical electrical performance in a legacy SOT-23 package with lower assembly cost and broader distributor availability, while the XC6210B182MR-G trades discharge capability and PSRR for marginally lower BOM count in non-critical discharge scenarios.

Availability

MCP1812BT-018/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and hearing aid processors requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MCP1812BT-018/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 is a leading provider of microcontrollers, analog components, and Flash-IP solutions, headquartered in Chandler, Arizona.

The MCP1811/1812 family was engineered specifically for ultra-low-power battery and energy-harvesting applications-prioritizing nanoscale quiescent current, ceramic capacitor compatibility, and minimal footprint without sacrificing output current capability.

FAQ

What is the maximum input voltage rating for the MCP1812BT-018/TT?

The MCP1812BT-018/TT has an absolute maximum input voltage rating of +6.0 V per its datasheet. However, the recommended operating input voltage range is 1.8 V to 5.5 V. Exceeding 5.5 V risks permanent damage, and operation below 2.4 V limits output current to less than 300 mA due to dropout constraints at 1.8 V output.

Does the MCP1812BT-018/TT require an external shutdown resistor?

No, the MCP1812BT-018/TT does not require an external pull-up resistor on the SHDN pin. Its internal logic threshold is defined as V_SHDN-HIGH ≥ 70% of VIN and V_SHDN-LOW ≤ 20% of VIN, allowing direct connection to MCU GPIO or open-drain control signals. The device remains enabled when SHDN is left floating or tied to VIN.

Can the MCP1812BT-018/TT be used with a 1 µF output capacitor?

No-the MCP1812BT-018/TT requires a minimum 2.2 µF X7R ceramic output capacitor for stability, as specified in the datasheet for all MCP1812X variants. Using 1 µF violates the stability condition and may cause oscillation or excessive output ripple, especially under dynamic load conditions.

What is the thermal resistance (θ_JA) of the MCP1812BT-018/TT in its SOT-23 package?

The MCP1812BT-018/TT in 3-lead SOT-23 has a thermal resistance θ_JA of 211.33°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and no thermal vias. This value assumes standard PCB layout practices; adding thermal vias beneath the GND pad can reduce θ_JA by up to 30%.

Is the output discharge feature of the MCP1812BT-018/TT controllable or always active?

The output discharge feature of the MCP1812BT-018/TT is automatically activated only when the SHDN pin is driven low (≤20% of VIN). It is not user-controllable via other pins or registers-it engages synchronously with shutdown entry and disengages immediately upon SHDN high-to-low transition. The discharge transistor (R_DCH = 100 Ω) is internal and dedicated solely to this function.

MCP1812BT-018/TT Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

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):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.6V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 0.5 µA

Current - Supply (Max):: 220 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:: SOT-23-3

MCP1812BT-018/TT FAQ

1.How can I place an order for MCP1812BT-018/TT through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1812BT-018/TT 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 MCP1812BT-018/TT reliable?

The price and inventory of MCP1812BT-018/TT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812BT-018/TT is usually 5 days.

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MCP1812BT-018/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1812BT-018/TT 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 MCP1812BT-018/TT?

For technical support, including MCP1812BT-018/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-018/TT requirements.

6.How does Aetrix verify that MCP1812BT-018/TT is sourced from the original manufacturer or authorized distributors?

All MCP1812BT-018/TT 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 MCP1812BT-018/TT meets industry standards.

7.What is the process for return or replacement of MCP1812BT-018/TT?

All MCP1812BT-018/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-018/TT, 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 MCP1812BT-018/TT part is unused and in its original packaging.

Return procedure for MCP1812BT-018/TT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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