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

Microchip Technology MCP1812BT-012/TT

Name: MCP1812BT-012/TT
Brand: Microchip Technology
SKU: MCP1812BT-012/TT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1812BT-012/TT

Manufacturer:: Microchip Technology

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

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

Datasheet:: MCP1812BT-012/TT.pdf

Description:: IC REG LINEAR 1.2V 300MA SOT23-3

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Product details

Overview

MCP1812BT-012/TT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO linear regulator with fixed 1.2 V output, 250 nA typical operating current, and shutdown capability delivering 5 nA typical supply current. It operates from 1.8 V to 5.5 V input and supports ceramic output capacitors as small as 2.2 µF. It is designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.

For engineers reviewing the MCP1812BT-012/TT datasheet, MCP1812BT-012/TT pinout, MCP1812BT-012/TT application, or MCP1812BT-012/TT equivalent, this page delivers verified specifications, package mapping, functional role in low-power subsystems, and validated alternative options for ultra-low-I_Q LDO selection.

Technical Context

The MCP1812BT-012/TT belongs to the MCP1812X family - the 300 mA variant with output discharge (A-suffix) and 1.2 V fixed output. It uses a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and stable operation with minimal 2.2 µF ceramic output capacitance.

Its shutdown control (SHDN pin) enables deep-sleep mode with 5 nA typical quiescent current, and its ground current remains linearly proportional to load (180–220 µA across 0–300 mA), supporting precise power budgeting in sub-mA systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.2 V ±4% - ensures stable core voltage for ultra-low-voltage MCUs and sensors.
Max Output Current	300 mA - supports higher-current peripherals (e.g., BLE radios, display drivers) without external boost stages.
Quiescent Current	250 nA typical - enables multi-year battery life in devices drawing <1 µA average current.
Shutdown Current	5 nA typical - meets stringent energy-harvesting storage requirements during extended idle periods.
Input Voltage Range	1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and supercapacitor sources.
Dropout Voltage	400 mV typical at 300 mA - allows regulation down to ~1.6 V input, maximizing usable battery capacity.
Stability Capacitor	2.2 µF ceramic (X7R) - reduces BOM cost/size vs. tantalum and lowers output noise (<223 µV_rms).

Pinout & Package

Package: 3-Lead SOT-23 - compact 2.92 mm × 1.3 mm footprint with exposed pad option for thermal enhancement on standard PCBs.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Input voltage supply	Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor near pin for PSRR optimization.
VOUT	Regulated output	Delivers stable 1.2 V; must connect ≥2.2 µF X7R ceramic capacitor directly to GND for stability.
GND	Ground reference	Low-impedance return path for regulator ground current only; tie to quiet ground plane or output cap return.

Key Features

Feature	Design Value
Ultra-low I_Q	250 nA typical enables >10-year battery life in 10 µA-average IoT endpoints.
Output discharge	Active discharge path (RDCH = 100 Ω typical) clears VOUT within microseconds after SHDN assertion.
Ceramic capacitor stability	Validated with 2.2 µF X7R - eliminates ESR requirements and reduces solution size by >50% vs. tantalum.
Overcurrent protection	Foldback current limit (100 mA at R_LOAD = 1 Ω) prevents thermal runaway during short-circuit events.
PSRR performance	−50 dB at 1 kHz (no C_IN) - suppresses switching noise from upstream DC/DC converters in mixed-power systems.

Applications

Wearable Health Monitor	Hearing Aid Power Management
Use Scenario: Continuous ECG sensing with Bluetooth LE transmission every 5 seconds in a wrist-worn patch. IC Role / Device Role / Timing Role: Primary 1.2 V supply for ultra-low-power MCU and analog front-end; enables sleep-mode I_Q <100 nA. Use Value: Extends coin-cell (CR2032) lifetime from 6 to >24 months by minimizing regulator overhead during 99.8% sleep duty cycle.	Use Scenario: Miniature in-the-ear hearing aid using MEMS microphone and DSP running on sub-1 V logic. IC Role / Device Role / Timing Role: Core voltage regulator for DSP and audio codec; provides fast start-up (<400 µs) between voice activity bursts. Use Value: Enables use of 380 mAh zinc-air battery with 3+ year operational life due to 5 nA shutdown current.
Energy-Harvesting Sensor Node	Smart Card with Secure Element
Use Scenario: Indoor light-harvesting node powering LoRaWAN transmitter from amorphous silicon cell. IC Role / Device Role / Timing Role: Voltage stabilization stage after supercapacitor buffer; regulates variable 2.0–4.5 V input to fixed 1.2 V. Use Value: Maintains regulation down to 1.6 V input, extracting >15% more usable energy from harvested source vs. higher-I_Q alternatives.	Use Scenario: Contactless payment card with embedded secure microcontroller requiring strict 1.2 V ±4% supply. IC Role / Device Role / Timing Role: Precision LDO supplying secure element during RF field activation; features fast line transient response (<200 µs). Use Value: Meets EMVCo voltage tolerance and timing requirements without external supervision circuitry.

Wearable Health Monitor

Hearing Aid Power Management

Use Scenario: Continuous ECG sensing with Bluetooth LE transmission every 5 seconds in a wrist-worn patch.

IC Role / Device Role / Timing Role: Primary 1.2 V supply for ultra-low-power MCU and analog front-end; enables sleep-mode I_Q <100 nA.

Use Value: Extends coin-cell (CR2032) lifetime from 6 to >24 months by minimizing regulator overhead during 99.8% sleep duty cycle.

Use Scenario: Miniature in-the-ear hearing aid using MEMS microphone and DSP running on sub-1 V logic.

IC Role / Device Role / Timing Role: Core voltage regulator for DSP and audio codec; provides fast start-up (<400 µs) between voice activity bursts.

Use Value: Enables use of 380 mAh zinc-air battery with 3+ year operational life due to 5 nA shutdown current.

Energy-Harvesting Sensor Node

Smart Card with Secure Element

Use Scenario: Indoor light-harvesting node powering LoRaWAN transmitter from amorphous silicon cell.

IC Role / Device Role / Timing Role: Voltage stabilization stage after supercapacitor buffer; regulates variable 2.0–4.5 V input to fixed 1.2 V.

Use Value: Maintains regulation down to 1.6 V input, extracting >15% more usable energy from harvested source vs. higher-I_Q alternatives.

Use Scenario: Contactless payment card with embedded secure microcontroller requiring strict 1.2 V ±4% supply.

IC Role / Device Role / Timing Role: Precision LDO supplying secure element during RF field activation; features fast line transient response (<200 µs).

Use Value: Meets EMVCo voltage tolerance and timing requirements without external supervision circuitry.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B122MR-G	1.2 V fixed, 200 mA max, 250 nA I_Q, no output discharge, SOT-23-3	Lacks active VOUT discharge; unsuitable where rapid rail collapse is required post-shutdown.	Select when output discharge is unnecessary and 200 mA output suffices.
Ricoh RP111N121D-TR-F	1.2 V fixed, 300 mA max, 300 nA I_Q, 10 nA shutdown, SOT-23-5 (adds EN and N.C.)	5-pin package adds enable control flexibility but increases layout area; slightly higher I_Q.	Choose when system-level sequencing or independent enable logic is needed beyond SHDN.

Compared with MCP1812BT-012/TT, the XC6210B122MR-G offers lower cost but sacrifices discharge functionality and current headroom, while the RP111N121D-TR-F provides pinout flexibility at the expense of higher shutdown current and larger footprint - making MCP1812BT-012/TT optimal for space-constrained, ultra-low-I_Q designs requiring guaranteed VOUT collapse.

Availability

MCP1812BT-012/TT is available at Aetrix Electronics and suitable for energy harvesting, wearable electronics, and medical device applications requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MCP1812BT-012/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, and FPGA solutions, serving automotive, industrial, communications, and consumer markets with high-reliability semiconductor products.

The MCP1811/12 family was engineered specifically for ultra-low-power battery and energy-harvesting systems, emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust transient response in miniature packages.

FAQ

What is the maximum input voltage rating for MCP1812BT-012/TT?

The absolute maximum input voltage for MCP1812BT-012/TT is +6.0 V. However, the recommended operating range is 1.8 V to 5.5 V per the datasheet's electrical characteristics table. Exceeding 5.5 V may cause permanent damage or violate thermal limits, especially under full 300 mA load.

Does MCP1812BT-012/TT require an input capacitor?

While not strictly required for stability, MCP1812BT-012/TT benefits from a 1 µF ceramic input capacitor placed close to the VIN and GND pins. This improves PSRR, reduces high-frequency noise coupling, and mitigates voltage spikes from upstream sources - particularly important in battery-fed or energy-harvesting systems with high source impedance.

Is MCP1812BT-012/TT pin-compatible with other MCP1812 variants?

Yes - MCP1812BT-012/TT in the 3-Lead SOT-23 package shares identical pinout (VIN, VOUT, GND) with all other MCP1812X devices in the same package type, including MCP1812AT-012/TT (10 nA shutdown) and MCP1812BT-120/TT (1.2 V, SC70). Pin compatibility enables drop-in replacement within the same package family.

What is the thermal resistance (θ_JA) of MCP1812BT-012/TT in SOT-23?

For the 3-Lead SOT-23 package, MCP1812BT-012/TT has a typical junction-to-ambient thermal resistance (θ_JA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard layout practices; adding thermal vias under the exposed pad (if present) can reduce θ_JA significantly.

Can MCP1812BT-012/TT be used with a 1 µF output capacitor?

No - MCP1812BT-012/TT requires a minimum 2.2 µF ceramic (X7R) output capacitor for guaranteed stability, as specified in the datasheet. Using 1 µF may cause oscillation or poor transient response, especially at full 300 mA load. The 1 µF requirement applies only to the 150 mA MCP1811X series.

MCP1812BT-012/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):: 1.2V

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-012/TT FAQ

1.How can I place an order for MCP1812BT-012/TT through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1812BT-012/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-012/TT reliable?

The price and inventory of MCP1812BT-012/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-012/TT is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-012/TT transactions.

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MCP1812BT-012/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1812BT-012/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-012/TT?

For technical support, including MCP1812BT-012/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-012/TT requirements.

6.How does Aetrix verify that MCP1812BT-012/TT is sourced from the original manufacturer or authorized distributors?

All MCP1812BT-012/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-012/TT meets industry standards.

7.What is the process for return or replacement of MCP1812BT-012/TT?

All MCP1812BT-012/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-012/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-012/TT part is unused and in its original packaging.

Return procedure for MCP1812BT-012/TT:

1.Submit a request within 90 days.

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

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