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Microchip Technology MCP1811AT-033/OT
- Part No.:
- MCP1811AT-033/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811AT-033/OT.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
MCP1811AT-033/OT from Microchip Technology is a 150 mA ultra-low quiescent current (250 nA typical) fixed 3.3V low-dropout linear regulator in SOT-23-3 package, featuring output discharge during shutdown and stable operation with 1.0 µF ceramic output capacitor. It operates across 1.8V–5.5V input range and targets energy-constrained battery-powered systems requiring long operational life.
For engineers reviewing the MCP1811AT-033/OT datasheet, MCP1811AT-033/OT pinout, MCP1811AT-033/OT application, or MCP1811AT-033/OT equivalent, this page delivers verified technical context, package-specific pin definitions, real-world use cases in wearable and medical electronics, and validated alternative options for ultra-low-power LDO selection.
Technical Context
The MCP1811AT-033/OT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 150 mA) and minimal ground current (90–110 µA over full load range). Its internal error amplifier and reference circuit maintain ±4% output voltage accuracy across –40°C to +85°C junction temperature.
Shutdown control is active-low via dedicated SHDN pin (not present on 3-lead variant), but MCP1811AT-033/OT is the 3-pin SOT-23 version without SHDN - confirming it is the non-shutdown, output-discharge-capable variant per Table 1 (MCP1811A designation) and Package Types diagram showing 3-lead SOT-23 pinout as VOUT-VIN-GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% - ensures compatibility with 3.3V logic and analog subsystems without external feedback network. |
| Max Output Current | 150 mA - supports moderate-current peripherals such as BLE radios, sensors, or microcontroller cores in sleep-active cycling. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices drawing <1 µA average system current. |
| Input Voltage Range | 1.8 V to 5.5 V - accommodates single-cell Li-ion, LiFePO₄, or multi-cell alkaline/NiMH sources without pre-regulation. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to ~3.7 V input when delivering full 3.3 V output, critical for end-of-battery-life operation. |
| Output Capacitor | 1.0 µF ceramic (X7R) - reduces BOM cost and PCB area vs. tantalum; enables low-noise performance (<170 µVrms noise, 10 Hz–100 kHz). |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature consumer applications including wearables and hearing aids. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236), JEDEC MO-178AA compliant, 2.92 mm × 1.3 mm footprint, no thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output voltage node | Delivers stable 3.3 V to load; requires 1.0 µF ceramic capacitor to GND for stability and low noise. |
| VIN | Unregulated input supply connection | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor close to pin to suppress high-frequency ripple. |
| GND | Reference and return path for regulator core | Must connect directly to quiet ground plane or output capacitor return to minimize PSRR degradation and load transient overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in coin-cell-powered devices operating at sub-µA average current. |
| Output discharge on shutdown | Active internal discharge transistor (RDCH = 100 Ω typical) rapidly drains VOUT capacitance when disabled - prevents residual voltage from interfering with system reset sequencing. |
| Ceramic capacitor stability | Guaranteed stable with 1.0 µF X7R ceramic output cap - eliminates need for ESR-tuned tantalum or aluminum electrolytic, reducing size and cost. |
| Overcurrent protection | Foldback current limit (50 mA typical at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events without latch-up. |
| High PSRR (–50 dB @ 1 kHz) | Maintains clean 3.3 V rail despite noisy input sources (e.g., switching DC/DC converters), improving ADC/Sensor accuracy. |
Applications
| Wearable Electronics | Medical Hearing Aids |
|---|---|
Use Scenario: Smart wristband with optical heart-rate sensor, BLE radio, and motion processor operating on CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 3.3V power rail regulator supplying sensor interface, RF transceiver, and MCU core during active and deep-sleep modes. Use Value: 250 nA quiescent current extends battery life beyond 2 years; output discharge ensures clean power-down of BLE stack upon sleep entry. |
Use Scenario: Miniature in-the-ear hearing aid using MEMS microphone and low-power DSP, powered by Zn-air battery. IC Role / Device Role / Timing Role: Single-point 3.3V LDO delivering regulated supply to analog front-end and digital signal processor under dynamic load conditions. Use Value: 400 mV dropout enables usable runtime down to 3.7 V input; ±4% output tolerance maintains consistent gain calibration across battery discharge curve. |
| Energy Harvesting Node | Smart Card Interface |
Use Scenario: Indoor light-harvesting IoT sensor node (temperature/humidity) with supercapacitor buffer and intermittent transmission. IC Role / Device Role / Timing Role: Regulator bridging variable harvester output (2.0–4.5 V) to stable 3.3 V for MCU and radio during burst transmit cycles. Use Value: Stable operation with 1.0 µF ceramic cap minimizes startup delay (<1 ms rise time); low IQ preserves harvested energy during idle periods. |
Use Scenario: Contactless smart card reader IC requiring precise 3.3V supply for RF field generation and secure crypto engine. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO powering RF analog circuitry and secure element, rejecting noise from digital controller. Use Value: –50 dB PSRR at 1 kHz suppresses digital switching noise; 150 mA capability supports peak RF field drive without droop. |
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/MB | Same 3.3V output, 250 nA IQ, but no output discharge; SOT-23-3 package; 100 mA max output. | Lacks discharge function - unsuitable where rapid VOUT decay is required for system-level reset integrity. | Select when output discharge is unnecessary and load current ≤100 mA; lower cost alternative for simpler systems. |
| TN0120A-3.3V | 3.3V, 200 nA IQ, 150 mA, no discharge; SOT-23-3; higher dropout (500 mV typ at 150 mA). | Higher dropout limits usable input range - may cut off earlier during battery discharge than MCP1811AT-033/OT. | Choose if lowest possible IQ is primary requirement and input voltage remains >4.0 V across full battery life. |
Compared with MCP1700T-3302E/MB and TN0120A-3.3V, the MCP1811AT-033/OT uniquely combines 150 mA output, 250 nA IQ, and integrated output discharge in a 3-pin SOT-23 - making it optimal for space-constrained, battery-critical designs requiring controlled power-down behavior.
Availability
MCP1811AT-033/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable electronics, and medical hearing aids requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1811AT-033/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 Inc. is a leading provider of microcontrollers, analog components, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1811 family was designed specifically for ultra-low-power, long-life battery applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust transient response in miniature packages.
FAQ
What is the maximum input voltage rating for the MCP1811AT-033/OT?
The MCP1811AT-033/OT 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 the 1.8 V to 5.5 V input range. Exceeding 6.0 V risks permanent damage per Absolute Maximum Ratings on DS20006088C-page 4.
Does the MCP1811AT-033/OT include a shutdown pin?
No, the MCP1811AT-033/OT does not include a shutdown pin. It is the 3-lead SOT-23 variant (VOUT-VIN-GND) and corresponds to the MCP1811A functional variant, which provides output discharge but lacks SHDN control. Shutdown functionality requires the 5-lead versions (e.g., MCP1811A-3302E/OT).
Can the MCP1811AT-033/OT operate with a 1.0 µF ceramic output capacitor?
Yes - the MCP1811AT-033/OT is explicitly characterized and guaranteed stable with a 1.0 µF X7R ceramic output capacitor, as stated in the Features section and Electrical Characteristics table. This eliminates ESR requirements and simplifies layout versus traditional tantalum-based LDOs.
What is the typical dropout voltage of the MCP1811AT-033/OT at full load?
The typical dropout voltage of the MCP1811AT-033/OT is 400 mV at 150 mA output current and +25°C, defined as the VIN–VOUT differential at which VOUT drops 2% below nominal 3.3 V. This value increases slightly at temperature extremes and higher loads, remaining within 600 mV maximum per datasheet specifications.
Is output discharge active in the MCP1811AT-033/OT, and how does it function?
Yes - the MCP1811AT-033/OT implements output discharge via an internal NMOS transistor (RDCH = 100 Ω typical) that connects VOUT to GND when the device is unpowered or in shutdown state. This feature rapidly discharges external output capacitance, preventing unintended wake-up or latch-up in downstream circuitry during power transitions.
MCP1811AT-033/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):
- 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-23-5
MCP1811AT-033/OT FAQ
1.How can I place an order for MCP1811AT-033/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-033/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-033/OT reliable?
The price and inventory of MCP1811AT-033/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-033/OT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-033/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-033/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-033/OT?
MCP1811AT-033/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-033/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-033/OT?
For technical support, including MCP1811AT-033/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-033/OT requirements.
6.How does Aetrix verify that MCP1811AT-033/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-033/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-033/OT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-033/OT?
All MCP1811AT-033/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-033/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-033/OT part is unused and in its original packaging.
Return procedure for MCP1811AT-033/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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