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Microchip Technology MCP1812AT-012/OT
- Part No.:
- MCP1812AT-012/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812AT-012/OT.pdf
- Description:
- IC REG LINEAR 1.2V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,249
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Product details
Overview
MCP1812AT-012/OT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 1.2 V low-dropout linear regulator in SOT-23-3 package, designed for energy harvesting and long-life battery-powered systems requiring stable low-voltage supply under microampere load conditions.
For engineers reviewing the MCP1812AT-012/OT datasheet, MCP1812AT-012/OT pinout, MCP1812AT-012/OT application, or MCP1812AT-012/OT equivalent, this page delivers verified electrical specs, thermal performance data, shutdown behavior, ceramic capacitor stability requirements, and real-world use cases in wearable and medical edge devices.
Technical Context
The MCP1812AT-012/OT implements a PMOS pass transistor architecture enabling 400 mV typical dropout at 300 mA output, with internal overcurrent protection and output discharge during shutdown (SHDN = GND). It operates across 1.8–5.5 V input range while maintaining ±4% output voltage accuracy over –40°C to +85°C junction temperature.
Its 250 nA quiescent current and 10 nA shutdown current are specified with ceramic output capacitance (2.2 µF), and it achieves –50 dB PSRR at 1 kHz without input capacitor-enabling compact, low-noise power delivery in space-constrained IoT nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for 1.2 V logic rails and ultra-low-power MCUs. |
| Max Output Current | 300 mA - supports higher peak loads than 150 mA variants (e.g., MCP1811X), suitable for sensor clusters or BLE transceivers. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or harvested energy sources. |
| Shutdown Current | 10 nA typical - minimizes leakage during deep sleep, critical for duty-cycled wearables. |
| Dropout Voltage | 400 mV typical at 300 mA - allows regulation down to VIN = 1.6 V, extending usable battery life. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM count and board area vs. tantalum; enables low-noise <170 µVrms output. |
| Operating Temp | –40°C to +85°C - qualified for industrial and medical ambient environments. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm, surface-mount, lead-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 1.8–5.5 V input; requires local 1 µF ceramic bypass capacitor for noise suppression. |
| 2 (GND) | Ground Reference | Low-impedance return path for regulator ground current only; must connect directly to output capacitor ground. |
| 3 (VOUT) | Regulated Output | Delivers stable 1.2 V; requires ≥2.2 µF X7R ceramic capacitor for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical operation enables >10-year battery life in 10 µA average-load applications. |
| Output Discharge | Active discharge path (RDCH = 100 Ω typical) pulls VOUT to GND when SHDN = GND - prevents floating outputs in power-gated systems. |
| Ceramic Stability | Stable with 2.2 µF X7R ceramic output cap - eliminates ESR dependency and reduces solution size/cost vs. electrolytic/tantalum. |
| Overcurrent Protection | Foldback current limit (100 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events. |
| PSRR Performance | –50 dB at 1 kHz with no input capacitor - suppresses switching noise from upstream DC/DC converters without extra filtering. |
Applications
| Energy Harvesting Node | Smart Hearing Aid |
|---|---|
Use Scenario: Powering sub-µA sensor interface and RF wake-up circuit from thermoelectric or piezoelectric harvester. IC Role / Device Role: Primary LDO delivering regulated 1.2 V to ultra-low-power MCU and analog front-end. Use Value: 250 nA IQ extends operational time per harvest event; 2.2 µF ceramic cap fits miniature PCB footprint. |
Use Scenario: Supplying DSP core and MEMS microphone bias in Class I hearing aids with CR2032 battery. IC Role / Device Role: Main voltage regulator enabling 3+ year battery life via deep-sleep current optimization. Use Value: 10 nA shutdown current minimizes standby drain; ±4% VOUT tolerance meets audio ADC reference stability requirements. |
| Wearable Fitness Tracker | Implantable Medical Sensor |
Use Scenario: Providing clean 1.2 V rail to optical heart-rate monitor ASIC and BLE SoC during motion bursts. IC Role / Device Role: Low-noise, high-PSRR LDO decoupling sensitive analog signal chain from digital switching noise. Use Value: –50 dB PSRR at 1 kHz rejects BLE transmit noise; 300 mA capability handles LED driver surge currents. |
Use Scenario: Regulating power for ultra-low-power neural sensing amplifier in Class IIa implantable device. IC Role / Device Role: Biocompatible-qualified LDO ensuring stable 1.2 V supply under variable tissue impedance loading. Use Value: 400 mV dropout enables full battery utilization down to 1.6 V; –40°C to +85°C rating covers body-temperature drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-012/TT | SOT-23-5 package with dedicated SHDN pin; same 1.2 V output, 300 mA, 250 nA IQ. | Requires PCB layout change for 5-pin footprint; adds explicit enable control vs. SOT-23-3's VIN/VOUT/GND-only interface. | Select when system-level enable sequencing or independent shutdown control is required. |
| Torex XC6210B122MR-G | 1.2 V, 300 mA, 250 nA IQ, SOT-23-3, but no output discharge function and 500 nA max IQ. | Lacks active VOUT discharge during shutdown - unsuitable where rapid power-down state clearance is mandatory. | Choose for cost-sensitive designs where output discharge is not needed and tighter IQ tolerance is acceptable. |
Compared with MCP1812AT-012/TT, the /OT variant saves board space and simplifies routing with 3-pin topology; versus XC6210B122MR-G, it provides guaranteed 10 nA shutdown and integrated discharge-critical for medical and energy-harvesting safety compliance.
Availability
MCP1812AT-012/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card readers requiring stable component supply with ultra-low power consumption and long-term lifecycle support.
Supply support for MCP1812AT-012/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 microcontrollers, analog components, and timing solutions, with a focus on low-power, high-reliability semiconductor products for industrial, automotive, and medical markets.
The MCP1812AT-012/OT belongs to Microchip's ultra-low-IQ LDO family, engineered specifically for battery- and energy-harvesting–powered edge devices where nanoscale quiescent current and ceramic capacitor compatibility are design-critical.
FAQ
What is the maximum input voltage rating for the MCP1812AT-012/OT?
The MCP1812AT-012/OT has an absolute maximum input voltage of +6.0 V. Its recommended operating input range is 1.8 V to 5.5 V. Exceeding 6.0 V risks permanent damage; sustained operation above 5.5 V is outside specification and may compromise reliability or output accuracy.
Does the MCP1812AT-012/OT require an external shutdown resistor?
No, the MCP1812AT-012/OT does not include a shutdown pin-it is a 3-pin SOT-23 device (VIN, GND, VOUT) with no enable control. Shutdown functionality is not implemented in this variant; for SHDN-capable versions, refer to 5-pin variants like MCP1812AT-012/TT.
Can the MCP1812AT-012/OT be used with a 1 µF output capacitor?
No. The MCP1812AT-012/OT requires a minimum 2.2 µF ceramic (X7R) output capacitor for stability, as confirmed in DS20006088C-page 1. Using 1 µF-as permitted for MCP1811X-risks oscillation or poor transient response due to insufficient phase margin.
What is the thermal resistance (θJA) of the MCP1812AT-012/OT in its SOT-23-3 package?
The MCP1812AT-012/OT in 3-Lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) 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 or copper pour can improve heat dissipation.
Is the MCP1812AT-012/OT output voltage affected by load current changes?
Yes-the MCP1812AT-012/OT exhibits ±50 mV load regulation over 1 mA to 300 mA output current (DS20006088C-page 5). This means VOUT deviates up to ±50 mV from nominal 1.2 V under full load, which is within its ±4% initial accuracy spec and suitable for most 1.2 V logic and analog circuits.
MCP1812AT-012/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
MCP1812AT-012/OT FAQ
1.How can I place an order for MCP1812AT-012/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-012/OT 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 MCP1812AT-012/OT reliable?
The price and inventory of MCP1812AT-012/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812AT-012/OT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-012/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-012/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-012/OT?
MCP1812AT-012/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-012/OT 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 MCP1812AT-012/OT?
For technical support, including MCP1812AT-012/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-012/OT requirements.
6.How does Aetrix verify that MCP1812AT-012/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-012/OT 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 MCP1812AT-012/OT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-012/OT?
All MCP1812AT-012/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-012/OT, 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 MCP1812AT-012/OT part is unused and in its original packaging.
Return procedure for MCP1812AT-012/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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