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Microchip Technology MCP1811AT-030/LT
- Part No.:
- MCP1811AT-030/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811AT-030/LT.pdf
- Description:
- IC REG LINEAR 3V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,847
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Product details
Overview
MCP1811AT-030/LT from Microchip Technology is a 150 mA ultra-low quiescent current (250 nA typical) fixed-output 3.0 V low-dropout linear regulator in a 3-lead SOT-23 package, featuring output discharge during shutdown and stable operation with 1.0 µF ceramic output capacitance. It supports input voltages from 1.8 V to 5.5 V and delivers precise regulation for energy-constrained systems such as wearable medical sensors.
For engineers reviewing the MCP1811AT-030/LT datasheet, MCP1811AT-030/LT pinout, MCP1811AT-030/LT application, or MCP1811AT-030/LT equivalent, this page provides verified electrical parameters, thermal performance data, shutdown behavior, output stability conditions, and validated alternative LDOs for battery-powered edge devices requiring sub-µA sleep current and fast wake-up response.
Technical Context
The MCP1811AT-030/LT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 150 mA) and minimal ground current (90–110 µA across load). Its internal error amplifier and reference are optimized for operation down to 1.8 V input while maintaining ±4% output accuracy over –40°C to +85°C junction temperature.
Shutdown control is active-low via the SHDN pin, enabling 10 nA typical supply current draw and integrated output discharge (RDCH = 100 Ω typical) to rapidly deplete residual charge on downstream capacitors - critical for safe power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±4% - ensures stable rail for 3.3 V-tolerant microcontrollers operating at reduced core voltage. |
| Max Output Current | 150 mA - sufficient to power BLE SoCs, sensor signal chains, or low-power displays without external boost stages. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell–powered devices drawing <1 µA average current. |
| Shutdown Current | 10 nA typical - reduces standby drain to negligible levels in always-on wake-on-event architectures. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation from 3.4 V input when battery voltage drops below nominal 3.6 V. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, reducing PCB area and cost. |
| PSRR | –50 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.6 mm × 1.1 mm body, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output | Delivers fixed 3.0 V to load; requires 1.0 µF ceramic capacitor to GND for stability and low-noise operation. |
| VIN | Input supply | Accepts 1.8–5.5 V; must be decoupled with ≥0.1 µF ceramic capacitor close to pin to suppress high-frequency ripple. |
| GND | Ground reference | Low-impedance return path for load and regulator ground current; tie directly to output capacitor ground node for optimal PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Output discharge on shutdown | Active discharge path (RDCH = 100 Ω) pulls VOUT to GND within microseconds, preventing floating rails and unintended wake-ups. |
| Ceramic capacitor compatibility | Stable with 1.0 µF X7R ceramic - eliminates ESR requirements and enables use of small, reliable, low-cost MLCCs. |
| Ultra-low IQ across temperature | 250 nA typical from –40°C to +85°C - maintains long-term battery runtime regardless of ambient conditions. |
| Thermal protection | Internal foldback current limit (50 mA at RLOAD = 1 Ω) prevents thermal runaway during sustained overload or short-circuit events. |
| Fast start-up time | TRISE = 200–1000 µs - enables rapid power restoration after wake-from-sleep, minimizing latency in responsive IoT endpoints. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing powered by CR2032 coin cell with firmware-triggered deep-sleep cycles. IC Role / Device Role / Timing Role: Primary 3.0 V power rail regulator supplying analog front-end, ADC, and BLE radio during active bursts. Use Value: 250 nA quiescent current extends battery life beyond 3 years; output discharge prevents sensor bias drift during sleep transitions. | Use Scenario: Solar- or thermal-harvested power management for wireless environmental sensors deployed in remote locations. IC Role / Device Role / Timing Role: Final-stage LDO conditioning harvested voltage to clean 3.0 V rail for ultra-low-power MCU and RF transceiver. Use Value: Stable operation down to 1.8 V input enables usable energy extraction even under low-light or low-delta-T conditions. |
| Smart Card with Secure Element | Hearing Aid Front-End |
Use Scenario: Contactless payment card with embedded secure element requiring strict power sequencing and zero-voltage holdover. IC Role / Device Role / Timing Role: Regulator with controlled power-down ensuring secure element reset integrity during NFC field removal. Use Value: 10 nA shutdown current preserves charge in supercapacitor backup; output discharge guarantees VOUT reaches GND before secure IC enters reset state. | Use Scenario: Miniaturized hearing aid using zinc-air battery with dynamic load modulation based on acoustic environment. IC Role / Device Role / Timing Role: Low-noise 3.0 V supply for MEMS microphone preamp and DSP core with burst-mode processing. Use Value: –50 dB PSRR at 1 kHz rejects switching noise from Class-D receiver driver; 165.65 µVrms output noise preserves audio SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3002E/MB | Same 3.0 V output, 250 nA IQ, but no output discharge; 6 V max input; SOT-23-3 package. | Lacks active VOUT discharge - unsuitable where rapid rail collapse is required for system safety or sequencing. | Select when output discharge is unnecessary and higher input voltage margin (up to 6 V) is needed. |
| TN0305M | 3.0 V, 150 mA, 300 nA IQ, no discharge, 5.5 V max input; same SOT-23-3 footprint. | Higher quiescent current and no discharge path; lower PSRR (–45 dB @ 1 kHz) and wider output tolerance (±5%). | Choose for cost-sensitive designs where 50 nA IQ difference and absence of discharge are acceptable trade-offs. |
Compared with MCP1700T-3002E/MB and TN0305M, the MCP1811AT-030/LT uniquely combines 3.0 V regulation, 150 mA capability, 250 nA IQ, and integrated output discharge in a standard SOT-23-3 - making it the only option among the three that satisfies simultaneous ultra-low sleep current and controlled power-down requirements in safety-critical wearables.
Availability
MCP1811AT-030/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and smart card systems requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1811AT-030/LT 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, headquartered in Chandler, Arizona.
The MCP1811A/B series was designed specifically for ultra-long-life, battery- or energy-harvesting–powered applications demanding nanowatt-level quiescent current and robust shutdown behavior - targeting next-generation IoT edge nodes and medical wearables.
FAQ
What is the maximum input voltage rating for the MCP1811AT-030/LT?
The MCP1811AT-030/LT has an absolute maximum input voltage rating of +6.0 V. However, its specified operational input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate reliability specifications, even if below the absolute maximum. Always maintain VIN ≤ 5.5 V in normal operation.
Does the MCP1811AT-030/LT require an external pull-up resistor on the SHDN pin?
Yes - the SHDN pin is active-low and internally unconnected. A 1 MΩ pull-up resistor to VIN is recommended per the datasheet to ensure reliable turn-on during power-up. Without it, the device may remain in shutdown due to floating input, preventing regulation.
Can the MCP1811AT-030/LT operate stably with a 0.47 µF output capacitor?
No - the MCP1811AT-030/LT requires a minimum of 1.0 µF ceramic (X7R) output capacitance for guaranteed stability across all operating conditions. Using 0.47 µF risks oscillation, poor load transient response, and potential output voltage overshoot or droop.
What is the typical dropout voltage of the MCP1811AT-030/LT at 100 mA load?
The typical dropout voltage of the MCP1811AT-030/LT is 400 mV at 150 mA. At 100 mA, dropout is lower - approximately 280–320 mV based on Figure 2-11 (VR = 4.0 V) and proportional scaling. This enables regulation from as low as ~3.32 V input at full rated load.
Is the MCP1811AT-030/LT RoHS-compliant and halogen-free?
Yes - the MCP1811AT-030/LT is RoHS-compliant and halogen-free per Microchip's official product change notices and packaging specifications. The "/LT" suffix denotes lead-free, green (halogen-free) packaging in accordance with JEDEC J-STD-020 and IPC/JEDEC J-STD-075 standards.
MCP1811AT-030/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 3V
- 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:
- SC-70-5
MCP1811AT-030/LT FAQ
1.How can I place an order for MCP1811AT-030/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-030/LT 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-030/LT reliable?
The price and inventory of MCP1811AT-030/LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811AT-030/LT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-030/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-030/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-030/LT?
MCP1811AT-030/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-030/LT 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-030/LT?
For technical support, including MCP1811AT-030/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-030/LT requirements.
6.How does Aetrix verify that MCP1811AT-030/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-030/LT 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-030/LT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-030/LT?
All MCP1811AT-030/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-030/LT, 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-030/LT part is unused and in its original packaging.
Return procedure for MCP1811AT-030/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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