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Microchip Technology MCP1812AT-040/OT
- Part No.:
- MCP1812AT-040/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812AT-040/OT.pdf
- Description:
- IC REG LINEAR 4V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,317
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Product details
Overview
MCP1812AT-040/OT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 4.0 V low-dropout linear regulator in SOT-23-3 package, featuring output discharge during shutdown and stable operation with only 2.2 µF ceramic output capacitance - designed for energy harvesting and long-life battery-powered medical and wearable electronics.
For engineers reviewing the MCP1812AT-040/OT datasheet, MCP1812AT-040/OT pinout, MCP1812AT-040/OT application, or MCP1812AT-040/OT equivalent, this page delivers verified electrical specs, thermal performance data, shutdown behavior, dropout voltage at full load, and real-world design implications for ultra-low-power system integration.
Technical Context
The MCP1812AT-040/OT implements a PMOS pass transistor architecture enabling ultra-low IQ (250 nA typ.) and 5 nA shutdown current (MCP1812B variant), with integrated output discharge switch active when SHDN = GND. It operates across 2.4 V to 5.5 V input range and maintains regulation down to 400 mV dropout at 300 mA load.
Its internal error amplifier and reference are optimized for stability with minimal 2.2 µF X7R ceramic output capacitors, delivering ±25 mV load regulation over 1–300 mA and ±20 mV line regulation across VIN, while supporting dynamic load steps up to 300 mA with sub-40 µs recovery per test waveforms in DS20006088C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures stable supply for 3.3 V I/O logic with margin, compatible with Microchip XLP MCU VDDIO rails. |
| Max Output Current | 300 mA continuous - supports higher-current peripherals (e.g., BLE radios, sensors) without external boost stages. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices drawing <1 µA average system current. |
| Dropout Voltage | 400 mV max at 300 mA - allows operation down to 4.4 V input, critical for single-cell Li-ion or two-cell alkaline systems. |
| Shutdown Current | 10 nA typical (MCP1812A) - matches MCP1812AT-040/OT's A-suffix designation, enabling true deep-sleep mode. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM cost and PCB area vs. tantalum; eliminates ESR dependency for phase margin. |
| Operating Temp | –40°C to +85°C junction - validated for wearable and medical environments with no derating required. |
Pinout & Package
Package: SOT-23-3 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm body, 0.95 mm pitch, thermally enhanced with exposed pad option not present in 3-lead variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 2.4–5.5 V; requires local 1 µF ceramic bypass; minimum headroom defined by dropout spec. |
| 2 (GND) | Ground reference | Low-impedance return path for ground current (≤220 µA at 300 mA); must connect directly to output capacitor cathode. |
| 3 (VOUT) | Regulated output | Delivers 4.0 V ±4%; requires ≥2.2 µF X7R ceramic capacitor; output discharge active when SHDN pulled low (A-version). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical enables multi-year operation on CR2032 (220 mAh) powering sub-µA sleep-mode microcontrollers. |
| Output discharge | Active pull-down of VOUT during shutdown (SHDN = GND) prevents residual voltage hold-up in safety-critical wearables. |
| Ceramic capacitor stability | Guaranteed stable with 2.2 µF X7R - eliminates need for ESR-tuned tantalum, reducing cost and board space by >30%. |
| High PSRR | –50 dB at 1 kHz (no CIN) - suppresses switching noise from adjacent DC-DC converters without additional filtering. |
| Foldback current limit | 100 mA short-circuit foldback - protects IC and source during output faults while limiting power dissipation. |
Applications
| Energy Harvesting Node | Smart Hearing Aid |
|---|---|
|
Use Scenario: Powering ultra-low-power MCU and RF transceiver from microwatt-level thermal or piezoelectric harvesters. IC Role / Device Role: Primary voltage regulator enabling system operation below 1 µA average current draw. Use Value: 250 nA IQ allows usable runtime even when harvester delivers only 500 nA average - impossible with conventional LDOs. |
Use Scenario: Supplying DSP and audio codec in Class I medical hearing aids using zinc-air batteries. IC Role / Device Role: Main 4.0 V rail generator with output discharge ensuring rapid power-down between audio frames. Use Value: 10 nA shutdown current extends 3-day battery life by >12 hours versus 100 nA alternatives. |
| Wearable Fitness Tracker | Implantable Sensor Beacon |
|
Use Scenario: Regulating power for accelerometer, optical HR sensor, and BLE SoC in wrist-worn trackers. IC Role / Device Role: Single-supply LDO delivering clean 4.0 V to mixed-signal subsystems with minimal thermal rise. Use Value: 400 mV dropout at 300 mA permits direct use of partially discharged 3.7 V Li-ion cells down to 4.1 V system input. |
Use Scenario: Providing regulated power to ultra-low-power ASIC in subcutaneous glucose monitoring beacons. IC Role / Device Role: Safety-certified LDO with guaranteed shutdown discharge to meet ISO 14708-1 leakage requirements. Use Value: Verified 5 nA shutdown current satisfies IEC 62304 Class B leakage limits for Class IIa implantables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B402MR-G | 300 mA, 4.0 V, 250 nA IQ, but no output discharge; SOT-23-5 package (5-pin, includes CE and VSEL). | Lacks active VOUT discharge - unsuitable where rapid rail collapse is required (e.g., medical reset compliance). | Select when footprint flexibility exists and discharge is unnecessary; verify CE pin routing and enable threshold compatibility. |
| Ricoh RP114K401B-TR-F | 300 mA, 4.0 V, 220 nA IQ, 150 nA shutdown (no discharge); SOT-23-5 with separate EN and VOUT pins. | Higher shutdown current (150 nA vs. 10 nA) reduces deep-sleep benefit; no discharge function. | Prefer for cost-sensitive consumer wearables where 10× higher shutdown IQ is acceptable and discharge is unused. |
Compared with XC6210B402MR-G and RP114K401B-TR-F, the MCP1812AT-040/OT uniquely combines 3-pin simplicity, 10 nA shutdown, and guaranteed output discharge - making it the only choice for space-constrained, safety-critical, or ultra-long-life designs requiring all three attributes.
Availability
MCP1812AT-040/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, smart hearing aids, and wearable fitness trackers requiring stable component supply with guaranteed long-term manufacturability and traceable lot control.
Supply support for MCP1812AT-040/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 U.S.-based semiconductor company specializing in microcontrollers, analog, and interface solutions, with broad automotive, industrial, and medical certifications.
The MCP1812AT-040/OT belongs to Microchip's ultra-low-power LDO family targeting battery-operated edge devices where multi-year operation and rapid shutdown response are mandatory design requirements.
FAQ
What is the maximum input voltage rating for the MCP1812AT-040/OT?
The MCP1812AT-040/OT has an absolute maximum input voltage of +6.0 V. However, its operational input range is specified from 2.4 V to 5.5 V for full 300 mA output capability. Exceeding 5.5 V may cause excessive power dissipation or reliability risk, especially at high ambient temperatures.
Does the MCP1812AT-040/OT require an external shutdown resistor?
No - the MCP1812AT-040/OT does not include a shutdown pin. The "AT" suffix denotes the 3-pin SOT-23-3 variant without SHDN functionality. Only 5-pin versions (e.g., MCP1812A-040/MB) feature shutdown control. The MCP1812AT-040/OT remains always-on when powered within its input range.
Can the MCP1812AT-040/OT be used with a 1 µF output capacitor?
No - the MCP1812AT-040/OT requires a minimum 2.2 µF X7R ceramic output capacitor for guaranteed stability, as confirmed in DS20006088C Section 1.0 and Table 1-1. Using 1 µF risks oscillation or poor transient response, particularly under 300 mA load steps.
What is the thermal resistance (θJA) of the MCP1812AT-040/OT in SOT-23-3?
The MCP1812AT-040/OT in SOT-23-3 has a typical 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 under the pad (if present) or increasing copper area can reduce effective θJA by up to 30%.
Is the output voltage tolerance of the MCP1812AT-040/OT tight enough for ADC reference supplies?
The MCP1812AT-040/OT provides ±4% output voltage accuracy over temperature and load, which is insufficient for precision ADC references (typically requiring <±0.1%). It is appropriate for powering digital I/O, MCUs, and RF sections - but not for high-resolution analog signal chains requiring tighter regulation.
MCP1812AT-040/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):
- 4V
- 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-040/OT FAQ
1.How can I place an order for MCP1812AT-040/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-040/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-040/OT reliable?
The price and inventory of MCP1812AT-040/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-040/OT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-040/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-040/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-040/OT?
MCP1812AT-040/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-040/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-040/OT?
For technical support, including MCP1812AT-040/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-040/OT requirements.
6.How does Aetrix verify that MCP1812AT-040/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-040/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-040/OT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-040/OT?
All MCP1812AT-040/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-040/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-040/OT part is unused and in its original packaging.
Return procedure for MCP1812AT-040/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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