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Microchip Technology MCP1811AT-040/TT
- Part No.:
- MCP1811AT-040/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811AT-040/TT.pdf
- Description:
- IC REG LINEAR 4V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,583
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Product details
Overview
MCP1811AT-040/TT from Microchip Technology is a 150 mA ultra-low quiescent current (250 nA typical) fixed-output 4.0 V low-dropout linear regulator in a 3-lead SOT-23 package, featuring output discharge during shutdown and stable operation with only 1.0 µF ceramic output capacitance. It operates across 1.8V–5.5V input range and targets energy-constrained systems requiring long battery life.
For engineers reviewing the MCP1811AT-040/TT datasheet, MCP1811AT-040/TT pinout, MCP1811AT-040/TT application, or MCP1811AT-040/TT equivalent, this page delivers verified electrical specs, thermal performance data, shutdown behavior, ceramic-capacitor stability confirmation, and real-world use cases in wearable and medical edge devices.
Technical Context
The MCP1811AT-040/TT implements a PMOS pass transistor architecture enabling ultra-low IQ and fast start-up (400 µs typical delay from SHDN assertion), with integrated output discharge (RDCH = 100 Ω typical) to prevent residual voltage hold-up on powered-down rails. Its feedback loop is optimized for stability with minimal 1.0 µF X7R ceramic output capacitors.
It supports full-load operation up to 150 mA at dropout voltages ≤600 mV (at 150 mA), maintains ±25 mV load regulation over 1–150 mA, and delivers -50 dB PSRR at 1 kHz without input capacitor-critical for noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures precise biasing for 3.3V/4.0V logic interfaces and sensor reference rails |
| Max Output Current | 150 mA - sufficient to power microcontrollers, BLE radios, and MEMS sensors in compact wearables |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin-cell batteries in always-on monitoring applications |
| Shutdown Current | 10 nA typical - reduces system standby power to near-zero when paired with external wake-up controllers |
| Dropout Voltage | 600 mV max at 150 mA - allows regulation down to VIN = 4.6 V, maximizing usable battery voltage range |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, reducing PCB area and cost |
| Operating Temp | -40°C to +85°C - qualified for industrial and medical environments including body-worn devices |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AB), 2.92 mm × 1.3 mm × 1.0 mm, with exposed pad not present in this variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; must be decoupled locally to suppress high-frequency noise coupling into LDO control loop |
| VOUT | Regulated output | Delivers stable 4.0 V; requires ≥1.0 µF ceramic capacitor placed within 2 mm of pin for stability and transient response |
| GND | Ground reference | Low-impedance return path for load and internal circuitry; must connect directly to quiet ground plane near output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Output Discharge | Active discharge path (100 Ω typical) pulls VOUT to GND in shutdown - prevents back-powering of upstream circuits or false wake-ups |
| Ceramic-Capacitor Stability | Guaranteed stable with 1.0 µF X7R ceramic - eliminates ESR dependency, improves reliability vs. electrolytics, and cuts BOM count |
| Ultra-Low Shutdown IQ | 10 nA typical - enables >10-year shelf life for sealed medical patches and remote environmental sensors |
| Thermal Performance | θJA = 211.33°C/W on JEDEC 4-layer board - supports continuous 150 mA operation at ambient ≤65°C without heatsinking |
| PSRR Without CIN | -50 dB @ 1 kHz - maintains clean output under noisy input conditions (e.g., shared switcher rail), reducing need for additional filtering |
Applications
| Energy Harvesting Nodes | Wearable Health Monitors |
|---|---|
Use Scenario: Powering ultra-low-power MCU and RF transceiver from thermoelectric or piezoelectric harvesters delivering intermittent µW-level energy. IC Role / Device Role / Timing Role: Primary voltage regulator providing stable 4.0 V rail during burst-mode operation with sub-µA sleep current. Use Value: 250 nA quiescent current minimizes harvester energy drain during idle, extending functional uptime per energy capture event. | Use Scenario: Supplying optical heart-rate sensor and Bluetooth LE SoC in wrist-worn fitness tracker with CR2032 battery. IC Role / Device Role / Timing Role: Main system LDO delivering regulated 4.0 V to analog front-end and digital core during active sensing and transmission phases. Use Value: Output discharge clears residual voltage between measurements, preventing sensor offset drift and ensuring accurate baseline recovery. |
| Hearing Aid Processors | Smart Card Controllers |
Use Scenario: Providing clean 4.0 V supply to low-noise audio ADC and DSP in Class A/B hearing aids operating from zinc-air batteries. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator powering signal chain with <266 µVrms output noise (10 Hz–100 kHz). Use Value: Ceramic-capacitor stability and -50 dB PSRR suppress switching noise from adjacent DC/DC converters, preserving audio SNR. | Use Scenario: Regulating power for secure microcontroller and contactless interface IC in ISO 7816-compliant smart cards. IC Role / Device Role / Timing Role: Single-supply LDO converting variable battery or field-induced voltage to precise 4.0 V for cryptographic engine and RF frontend. Use Value: 4.0 V output matches standard smart card VCC requirements; 10 nA shutdown current meets ISO/IEC 7816-3 leakage limits for passive cards. |
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/OT | Same electrical specs and pinout; packaged in 3-lead SC70 (2.0 × 1.25 mm) - 25% smaller footprint but higher θJA (300.6°C/W) | Better suited for space-constrained designs where thermal margin allows; less robust thermal performance than SOT-23 | Select MCP1811AT-040/OT only if PCB area is critical and peak load duration is short or ambient temperature is low. |
| Torex XC6210B402MR-G | 4.0 V fixed output, 150 mA, 250 nA IQ, but no output discharge; requires ≥1.0 µF ceramic capacitor | Lacks active VOUT discharge - unsuitable where residual voltage must be cleared during deep sleep or reset sequences | Choose XC6210B402MR-G only when discharge functionality is unnecessary and alternate sourcing is required for supply continuity. |
Compared with MCP1811AT-040/OT and XC6210B402MR-G, the MCP1811AT-040/TT uniquely combines SOT-23 thermal robustness, guaranteed output discharge, and full-spec 150 mA capability - making it the optimal choice for production-critical, battery-powered medical and industrial edge nodes demanding reliability and predictable shutdown behavior.
Availability
MCP1811AT-040/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, hearing aid processors, and smart card controllers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1811AT-040/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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets.
The MCP1811/12 family was designed specifically for ultra-low-power, long-life battery applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated discharge functionality to eliminate external components in space- and energy-constrained designs.
FAQ
What is the maximum input voltage rating for the MCP1811AT-040/TT?
The MCP1811AT-040/TT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V is not recommended, as the device is specified for reliable performance only within its 1.8 V to 5.5 V input operating range. Exceeding 6.0 V risks permanent damage to the internal PMOS pass element and bandgap reference circuitry.
Does the MCP1811AT-040/TT require an input capacitor?
The MCP1811AT-040/TT does not require an input capacitor for stability, as confirmed by Microchip's AC/DC characterization showing -50 dB PSRR at 1 kHz with CIN = 0 µF. However, a 1 µF ceramic capacitor is strongly recommended at VIN to suppress high-frequency noise and transient spikes from shared power rails, especially when co-located with switching regulators.
How does the output discharge function work in the MCP1811AT-040/TT?
The MCP1811AT-040/TT activates an internal NMOS discharge transistor (RDCH = 100 Ω typical) when SHDN is pulled low, connecting VOUT directly to GND. This discharges the output capacitor rapidly - typically clearing 4.0 V to <100 mV within tens of microseconds - preventing back-powering of upstream circuitry and ensuring clean system reset sequencing in battery-powered applications.
Can the MCP1811AT-040/TT operate with a 1.0 µF X5R ceramic capacitor instead of X7R?
Yes, the MCP1811AT-040/TT is stable with 1.0 µF X5R ceramic capacitors, as X5R meets the minimum capacitance and ESR requirements specified in the datasheet. However, X7R is preferred for its superior temperature coefficient (±15% vs. ±15% for X5R, but tighter distribution) and voltage coefficient stability - critical for maintaining regulation accuracy across wide temperature and bias ranges in medical and industrial deployments.
What is the thermal resistance (θJA) of the MCP1811AT-040/TT in its SOT-23 package?
The MCP1811AT-040/TT in the 3-lead SOT-23 package has a thermal resistance θJA 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 layout practices; adding thermal vias beneath the GND pad can reduce θJA by up to 30%, improving sustained 150 mA output capability at elevated ambient temperatures.
MCP1811AT-040/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):
- 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-23-3
MCP1811AT-040/TT FAQ
1.How can I place an order for MCP1811AT-040/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-040/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 MCP1811AT-040/TT reliable?
The price and inventory of MCP1811AT-040/TT 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/TT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-040/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-040/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-040/TT?
MCP1811AT-040/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-040/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 MCP1811AT-040/TT?
For technical support, including MCP1811AT-040/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-040/TT requirements.
6.How does Aetrix verify that MCP1811AT-040/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-040/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 MCP1811AT-040/TT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-040/TT?
All MCP1811AT-040/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-040/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 MCP1811AT-040/TT part is unused and in its original packaging.
Return procedure for MCP1811AT-040/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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