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Microchip Technology MCP1811AT-040/OT
- Part No.:
- MCP1811AT-040/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811AT-040/OT.pdf
- Description:
- IC REG LINEAR 4V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,478
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Product details
Overview
MCP1811AT-040/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 4.0 V output, 1.8–5.5 V input range, and output discharge functionality during shutdown. It operates across –40°C to +85°C and is stable with a 1.0 µF ceramic output capacitor - designed for energy harvesting, wearable electronics, and long-life battery-powered medical devices like hearing aids.
For engineers reviewing the MCP1811AT-040/OT datasheet, MCP1811AT-040/OT pinout, MCP1811AT-040/OT application, or MCP1811AT-040/OT equivalent, this page delivers verified electrical specs, package mapping to SOT-23-3, functional role in ultra-low-power systems, and validated alternative options for design continuity.
Technical Context
The MCP1811AT-040/OT implements a CMOS-based LDO architecture with internal error amplifier, overcurrent protection, and an integrated discharge transistor (RDCH = 100 Ω typical) that actively pulls VOUT to GND when SHDN = GND. Its ultra-low IQ enables operation directly from harvested energy sources or coin cells lasting years in sleep mode.
It requires no external compensation and achieves ±25 mV load regulation (1 mA to 150 mA) and ±20 mV line regulation (1.8 V < VIN < 5.5 V), with dropout voltage of 400–600 mV at 150 mA - enabling regulation from single-cell Li-ion or alkaline sources down to ~4.4 V while maintaining 4.0 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures stable supply for 3.3 V–4.2 V logic rails and analog sensors without external feedback. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in always-on IoT endpoints with sub-µA average system current. |
| Shutdown Current | 10 nA typical - reduces leakage to negligible levels during deep-sleep states in wearables and smart cards. |
| Max Output Current | 150 mA - supports moderate-current peripherals (e.g., BLE radios, ADCs, small displays) without thermal derating on standard PCBs. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell LiFePO₄ (max 3.6 V), Li-ion (max 4.2 V), and two-cell alkaline (max 3.2 V) or 5 V USB-supplied systems. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic caps, reducing BOM cost and board area by >50% vs legacy LDOs. |
| Dropout Voltage | 400–600 mV at 150 mA - allows operation down to VIN = 4.4 V while sustaining 4.0 V output, critical for end-of-battery-life performance. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236). Compact 2.92 mm × 1.3 mm footprint with exposed pad option not applicable to this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output | Delivers stable 4.0 V to load; must connect ≥1.0 µF ceramic capacitor directly to GND for stability and noise suppression. |
| VIN | Input supply | Accepts 1.8–5.5 V unregulated input; requires local 1.0 µF ceramic decoupling close to pin to minimize PSRR degradation. |
| GND | Ground reference | Low-impedance return path for both input and output currents; tie directly to quiet ground plane or output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Output discharge on shutdown | Active VOUT-to-GND switch (RDCH = 100 Ω) clears residual charge in <1 ms - prevents unintended wake-up or latch-up in downstream circuitry. |
| Ceramic capacitor stability | Guaranteed stable with 1.0 µF X7R ceramic only - eliminates ESR requirements, simplifies layout, and improves transient response vs. polymer/tantalum alternatives. |
| Ultra-low shutdown IQ | 10 nA typical - reduces annual battery drain to <0.09 µAh, extending CR2032 life beyond 10 years in intermittent-sensing applications. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) - prevents thermal runaway during short-circuit events without requiring external current-sense components. |
| PSRR at 1 kHz | –50 dB (no CIN) - suppresses switching noise from adjacent DC-DC converters, enabling clean analog supply in mixed-signal SoC designs. |
Applications
| Energy Harvesting Sensors | Wearable Health Monitors |
|---|---|
Use Scenario: Indoor light-harvesting node powering a temperature/humidity sensor and BLE transmitter with intermittent 10-second wake cycles. IC Role / Device Role / Timing Role: Primary power regulator converting micro-watt-level photodiode output to stable 4.0 V for MCU and RF IC. Use Value: 250 nA IQ enables >99.9% duty-cycle sleep, allowing operation from <100 µW ambient light - eliminating batteries entirely. | Use Scenario: Smart wristband measuring heart rate via optical PPG, logging data locally, and syncing via Bluetooth Low Energy. IC Role / Device Role / Timing Role: Main supply for 32-bit ARM Cortex-M0+ MCU and analog front-end, active only during 200-ms measurement bursts. Use Value: 10 nA shutdown current extends CR2032 battery life to >24 months with daily 2-hour usage, meeting consumer expectations. |
| Hearing Aid Signal Chain | Smart Card Secure Element |
Use Scenario: Miniature rechargeable hearing aid with digital signal processor, microphone preamp, and Class-D receiver driver. IC Role / Device Role / Timing Role: Low-noise 4.0 V rail for precision audio ADC/DAC and DSP core, operating continuously during use. Use Value: 169 µVrms output noise (10 Hz–100 kHz) and ±25 mV load regulation preserve SNR >95 dB - critical for speech clarity. | Use Scenario: Contactless payment card with embedded secure microcontroller, NFC transceiver, and EEPROM. IC Role / Device Role / Timing Role: Power management unit delivering regulated 4.0 V to crypto engine during brief transaction windows (<50 ms). Use Value: Fast 400 µs startup from shutdown and 10 nA leakage ensure instant response to field activation while preserving 10-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-040/TT | Identical electrical specs and pinout; differs only in tape-and-reel packaging (3000 pcs/reel vs. 3000 pcs/reel - same quantity, different carrier format). | No functional difference; suitable for same PCB layouts and production processes. | Select MCP1811AT-040/TT for automated SMT placement requiring standard 8 mm tape; MCP1811AT-040/OT is optimized for manual prototyping or low-volume assembly. |
| Torex XC6210B402MR-G | 4.0 V fixed output, 250 nA IQ, but no output discharge; 100 mA max output; requires 1.0 µF ceramic cap. | Lacks active VOUT discharge - unsuitable where residual voltage must be cleared between operations (e.g., secure element reset). | Choose XC6210B402MR-G only if discharge function is unnecessary and 100 mA output suffices; verify startup timing and PSRR match for sensitive analog loads. |
Compared with MCP1811AT-040/TT, the /OT variant offers identical performance in a different packaging format, while the Torex XC6210B402MR-G trades discharge capability and 50 mA output headroom for marginally lower cost - making it viable only in non-critical discharge-free applications.
Availability
MCP1811AT-040/OT is available at Aetrix Electronics and suitable for energy harvesting sensors, wearable health monitors, and hearing aid signal chains requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1811AT-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 leading provider of microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The MCP1811A/B family was engineered specifically for ultra-low-power battery and energy-harvesting applications - prioritizing nanowatt quiescent operation, minimal external components, and robust performance across temperature and load extremes.
FAQ
What is the maximum input voltage rating for the MCP1811AT-040/OT?
The MCP1811AT-040/OT has an absolute maximum input voltage of +6.0 V. However, its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate reliability specifications - always maintain VIN ≤5.5 V in normal operation. The device's dropout voltage (400–600 mV at 150 mA) means VIN must remain ≥4.4 V to sustain 4.0 V output under full load.
Does the MCP1811AT-040/OT require an external resistor divider for output voltage setting?
No, the MCP1811AT-040/OT is a fixed-output LDO with factory-trimmed 4.0 V regulation - no external resistors are needed or supported. Its internal feedback network is laser-trimmed for ±4% accuracy across temperature and load. Adding external components to the VOUT pin will destabilize the regulator and void performance guarantees.
How does the output discharge feature work in the MCP1811AT-040/OT?
When the SHDN pin is pulled low (≤20% VIN), the MCP1811AT-040/OT activates an internal NMOS discharge transistor (RDCH = 100 Ω typical) between VOUT and GND. This discharges the output capacitor within microseconds - clearing residual voltage faster than passive RC decay. This prevents unintended wake-up of downstream logic and ensures deterministic reset behavior in secure or safety-critical systems.
Can the MCP1811AT-040/OT operate with a 1.0 µF ceramic capacitor rated for only 6.3 V?
Yes - the MCP1811AT-040/OT is stable with any 1.0 µF X7R ceramic capacitor rated ≥6.3 V. Since VOUT is fixed at 4.0 V, a 6.3 V-rated capacitor provides sufficient margin against DC bias derating and transient overshoot. Microchip validates stability using 0805/0603 X7R parts; avoid Y5V or Z5U dielectrics due to excessive capacitance loss with voltage/temperature.
What is the thermal resistance (θJA) of the MCP1811AT-040/OT in its SOT-23-3 package?
The MCP1811AT-040/OT in the 3-Lead SOT-23 package has a thermal resistance θJA of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. At 150 mA output and 5.5 V input, worst-case power dissipation is ~225 mW, resulting in ~48°C junction rise above ambient - well within the +85°C max operating junction temperature. No heatsink or thermal vias are required for typical use cases.
MCP1811AT-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 @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 110 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
MCP1811AT-040/OT FAQ
1.How can I place an order for MCP1811AT-040/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-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 MCP1811AT-040/OT reliable?
The price and inventory of MCP1811AT-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 MCP1811AT-040/OT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-040/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-040/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-040/OT?
MCP1811AT-040/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-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 MCP1811AT-040/OT?
For technical support, including MCP1811AT-040/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-040/OT requirements.
6.How does Aetrix verify that MCP1811AT-040/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-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 MCP1811AT-040/OT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-040/OT?
All MCP1811AT-040/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-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 MCP1811AT-040/OT part is unused and in its original packaging.
Return procedure for MCP1811AT-040/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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