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Microchip Technology MCP1811AT-033/TT
- Part No.:
- MCP1811AT-033/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811AT-033/TT.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
MCP1811AT-033/TT from Microchip Technology is a 3.3V fixed-output, 150 mA ultra-low quiescent current LDO regulator in 3-lead SOT-23 package, featuring 250 nA typical IQ, 400 mV typical dropout at 150 mA, and output discharge during shutdown. It powers critical low-power subsystems in energy harvesting nodes and wearable medical sensors where battery life exceeds 10 years.
For engineers reviewing the MCP1811AT-033/TT datasheet, MCP1811AT-033/TT pinout, MCP1811AT-033/TT application, or MCP1811AT-033/TT equivalent, key selection criteria include verified 250 nA quiescent current, confirmed 3.3V ±4% output accuracy over –40°C to +85°C, guaranteed stability with 1 µF ceramic output capacitor, and validated output discharge functionality in shutdown mode.
Technical Context
This device belongs to the MCP1811A subfamily-characterized by output discharge (DT) transistor and 150 mA continuous output capability. Its internal error amplifier drives a PMOS pass element with foldback current limiting and thermal shutdown protection.
The regulator operates across 1.8V–5.5V input range and maintains regulation down to 400 mV dropout at full load. Shutdown logic accepts TTL-compatible thresholds (VSHDN-HIGH ≥70% VIN, VSHDN-LOW ≤20% VIN), enabling direct interface with ultra-low-power microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±4% - Ensures reliable operation of 3.3V I/O peripherals without external trimming |
| Quiescent Current | 250 nA typical - Enables >10-year battery life in 10 µA average-load applications |
| Shutdown Current | 10 nA typical - Reduces system standby power to negligible levels in sleep modes |
| Max Output Current | 150 mA - Supports moderate-current loads like BLE radios or sensor signal chains |
| Dropout Voltage | 400 mV typical at 150 mA - Allows operation from single-cell Li-ion (3.0V min) or alkaline (3.2V min) |
| Stability Capacitor | 1.0 µF ceramic - Minimizes BOM cost and PCB area vs. tantalum or electrolytic alternatives |
| PSRR | –50 dB at 1 kHz - Suppresses switching noise from adjacent DC/DC converters |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm body, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output voltage node | Delivers stable 3.3V to load; requires 1 µF ceramic capacitor to GND for stability |
| VIN | Input supply connection | Accepts 1.8V–5.5V; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| GND | Ground reference and return path | Low-impedance connection to quiet ground plane; ties return of output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Output Discharge Transistor | 100 Ω RDCH - Actively discharges VOUT to GND within microseconds upon SHDN assertion, preventing floating rail issues |
| Ultra-Low IQ Architecture | 250 nA typical - Achieved via optimized biasing and subthreshold MOS operation, not just process scaling |
| Ceramic-Capacitor Stability | 1 µF minimum COUT - Eliminates ESR requirements and enables use of low-profile, high-reliability X7R dielectrics |
| Wide Input Range | 1.8V–5.5V - Supports direct connection to single-cell Li-ion, NiMH, or multi-cell alkaline sources |
| Thermal Protection | Integrated shutdown at TJ > +125°C - Prevents damage during sustained overload or poor heatsinking |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
Use Scenario: Powering wireless sensor node powered by thermoelectric generator (TEG) delivering ~20 µA average current. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable TEG output to stable 3.3V for MCU and RF transceiver. Use Value: 250 nA IQ ensures >95% of harvested energy reaches the load; output discharge prevents backfeeding into TEG during dark/cool periods. | Use Scenario: Supplying ultra-low-power pulse oximeter worn continuously for 7+ days on coin cell. IC Role / Device Role / Timing Role: Main power rail for analog front-end and BLE SoC during active measurement and deep-sleep cycles. Use Value: 10 nA shutdown current extends coin cell life beyond 10,000 hours; 400 mV dropout allows operation down to 3.2V battery voltage. |
| Smart Card Interface | Hearing Aid Audio Subsystem |
Use Scenario: Regulating power for contactless smart card reader IC operating from NFC field coupling. IC Role / Device Role / Timing Role: Standby regulator maintaining 3.3V rail while awaiting card presence detection pulse. Use Value: 250 nA IQ minimizes field energy draw; ±4% output tolerance meets ISO/IEC 14443-3 power supply requirements. | Use Scenario: Providing clean 3.3V supply to MEMS microphone and low-noise op-amp in digital hearing aid. IC Role / Device Role / Timing Role: Low-noise analog rail generator isolated from noisy digital domains. Use Value: –50 dB PSRR at 1 kHz suppresses switching noise from DSP core; 165.65 µVrms output noise avoids audible artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT | Same 3.3V output, but 1.6 µA IQ (6.4× higher); no output discharge; SC70-3 package | Lacks output discharge; higher IQ limits use in multi-year battery apps | Select only if footprint compatibility with SC70-3 is required and 1.6 µA IQ is acceptable |
| TN0330M-3302R | 3.3V, 250 nA IQ, but 100 mA max output; no output discharge; SOT-23-3 | Lower current rating; no discharge function; same package footprint | Use when 100 mA suffices and discharge is unnecessary; verify thermal margin at full load |
Compared with MCP1811AT-033/TT, MCP1700T-3302E/TT trades ultra-low IQ for broader vendor support, while TN0330M-3302R sacrifices 50 mA output headroom to match IQ-neither offers output discharge, making MCP1811AT-033/TT uniquely suited for systems requiring rapid rail collapse during shutdown.
Availability
MCP1811AT-033/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card interfaces requiring stable component supply with guaranteed long-term availability and traceable lot control.
Supply support for MCP1811AT-033/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, headquartered in Chandler, Arizona.
The MCP1811A series was designed specifically for ultra-low-power, long-life battery applications-emphasizing nanoscale quiescent current, minimal external components, and robust performance across temperature and load extremes.
FAQ
What is the maximum input voltage rating for MCP1811AT-033/TT?
The absolute maximum input voltage for MCP1811AT-033/TT is +6.0V. However, the recommended operating input range is 1.8V to 5.5V. Exceeding 5.5V may cause permanent damage or violate safe operating area limits, especially under high ambient temperatures. Always observe derating curves in the datasheet's thermal resistance tables when operating near maximum ratings.
Does MCP1811AT-033/TT require an external shutdown resistor?
No, MCP1811AT-033/TT does not require an external pull-up resistor on the SHDN pin. The device features an internal 1 MΩ pull-up to VIN, enabling direct connection to a microcontroller GPIO without additional components. This simplifies design and reduces BOM count in space-constrained wearables and sensor nodes.
Can MCP1811AT-033/TT operate stably with a 0.47 µF ceramic output capacitor?
No-MCP1811AT-033/TT requires a minimum of 1.0 µF ceramic (X7R or better) output capacitor for guaranteed stability across all operating conditions. Using 0.47 µF risks oscillation, especially under light loads or elevated temperatures, as confirmed by phase margin measurements in DS20006088C Figure 2-48 through 2-51.
What is the typical start-up time from shutdown for MCP1811AT-033/TT?
The typical start-up delay from SHDN assertion to VOUT reaching 10% of 3.3V is 400 µs, and the typical rise time from 10% to 95% of nominal output is 200–1000 µs (DS20006088C, Table 1). These values hold across –40°C to +85°C junction temperature and are measured with VIN = VR + 1V (i.e., 4.3V) and COUT = 1 µF.
Is MCP1811AT-033/TT qualified for automotive applications?
No-MCP1811AT-033/TT is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q200 qualified. It lacks automotive-specific stress testing, extended temperature validation (–40°C to +125°C), and PPAP documentation. For automotive use, consider Microchip's AEC-Q200 qualified MCP1702 or MIC5205 families instead.
MCP1811AT-033/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):
- 3.3V
- 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:
- SOT-23-3
MCP1811AT-033/TT FAQ
1.How can I place an order for MCP1811AT-033/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-033/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-033/TT reliable?
The price and inventory of MCP1811AT-033/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-033/TT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-033/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-033/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-033/TT?
MCP1811AT-033/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-033/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-033/TT?
For technical support, including MCP1811AT-033/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-033/TT requirements.
6.How does Aetrix verify that MCP1811AT-033/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-033/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-033/TT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-033/TT?
All MCP1811AT-033/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-033/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-033/TT part is unused and in its original packaging.
Return procedure for MCP1811AT-033/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1811AT-033/TT Tags
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