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Microchip Technology MCP1811BT-033/TT
- Part No.:
- MCP1811BT-033/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811BT-033/TT.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,253
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Product details
Overview
MCP1811BT-033/TT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 3.3V output, designed for energy-constrained battery-powered systems requiring stable voltage under light-load sleep modes and moderate load transients. It operates from 1.8V to 5.5V input, supports ceramic output capacitors as small as 1.0 µF, and features overcurrent protection and shutdown logic.
For engineers reviewing the MCP1811BT-033/TT datasheet, MCP1811BT-033/TT pinout, MCP1811BT-033/TT application, or MCP1811BT-033/TT equivalent, this page delivers verified electrical specs, package mapping, functional role in ultra-low-power architectures, and real-world alternative selection guidance - all grounded in Microchip's DS20006088C specification.
Technical Context
The MCP1811BT-033/TT belongs to the MCP1811B variant family: it lacks output discharge functionality (unlike MCP1811A), enabling ultra-low 5 nA typical shutdown current. Its internal error amplifier and PMOS pass transistor deliver tight line/load regulation (±20 mV / ±25 mV) across –40°C to +85°C junction temperature.
Stability is achieved with minimal 1.0 µF X7R ceramic output capacitance and no external compensation required. The device uses a dedicated SHDN pin with 70% VIN high-threshold and 20% VIN low-threshold, supporting direct microcontroller GPIO control without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - ensures compatibility with 3.3V I/O domains of ultra-low-power MCUs and sensors. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin-cell batteries in always-on monitoring applications. |
| Shutdown Current | 5 nA typical - reduces system standby power to near-zero when paired with host-controlled enable sequencing. |
| Max Output Current | 150 mA - sufficient for powering BLE SoCs, NFC tags, or sensor signal chains during active bursts. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, LiFePO₄, alkaline, or regulated intermediate rails. |
| Dropout Voltage | 600 mV max at 150 mA - allows operation down to ~3.9V input while maintaining 3.3V output under full load. |
| PSRR | –50 dB at 1 kHz - suppresses ripple from noisy switching supplies feeding the LDO input. |
Pinout & Package
Package: 3-Lead SOT-23 - compact 2.92 mm × 1.3 mm footprint with exposed pad option (not present in standard SOT-23); thermal resistance θJA = 211.33°C/W on JEDEC 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5V; requires local 1 µF ceramic bypass capacitor close to pin for stability and transient response. |
| VOUT | Regulated output | Delivers fixed 3.3V; must connect ≥1.0 µF X7R ceramic capacitor directly between VOUT and GND for loop stability. |
| GND | Ground reference | Low-impedance return path for load and regulator ground current; tie to quiet ground plane or output capacitor return. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical enables >10-year battery life in 10 µA average-current IoT endpoints. |
| No output discharge | Omits internal discharge FET - preserves output rail hold-up during shutdown for sequenced power-down schemes. |
| Ceramic-capacitor stable | Eliminates need for electrolytic or tantalum capacitors - reduces BOM cost, size, and aging-related failure risk. |
| Overcurrent protection | Foldback current limit (50 mA typical) prevents thermal runaway during short-circuit events without latch-up. |
| Wide temperature range | Specified from –40°C to +85°C junction - suitable for industrial wearables and medical body-worn devices. |
Applications
| Energy Harvesting Sensor Node | Smart Medical Patch |
|---|---|
|
Use Scenario: Indoor light-harvesting node powering a sub-100 µA MCU and analog sensor with intermittent 150 mA BLE transmission bursts. IC Role / Device Role / Timing Role: Primary voltage regulator supplying clean 3.3V to MCU, radio, and ADC during active periods; maintains regulation through wide input variation (2.2–4.8V). Use Value: 250 nA quiescent current minimizes drain during 99.9% sleep time; 150 mA capability supports full-power BLE advertising without brownout. |
Use Scenario: Disposable ECG patch operating continuously for 7 days on a CR2032 coin cell, sampling biopotentials and transmitting via Bluetooth Low Energy. IC Role / Device Role / Timing Role: System power manager delivering stable 3.3V to analog front-end and BLE SoC; enters 5 nA shutdown between measurement cycles. Use Value: Ultra-low shutdown current extends usable battery capacity by >30% versus standard LDOs; SOT-23 footprint fits constrained wearable PCB area. |
| Long-Life Smart Card | Industrial Wireless Sensor |
|
Use Scenario: Contactless payment card with embedded secure element and RF interface, activated only during proximity read events. IC Role / Device Role / Timing Role: On-demand power source activated by RF field; provides regulated 3.3V within microseconds of field detection. Use Value: Fast start-up rise time (200–1000 µs) ensures immediate power availability; 1.8V minimum input enables operation even as battery depletes. |
Use Scenario: Ruggedized vibration sensor deployed in factory machinery, logging data every 5 seconds and transmitting hourly via LoRaWAN. IC Role / Device Role / Timing Role: Primary regulator for microcontroller, MEMS accelerometer, and LoRa transceiver; withstands wide ambient temperature swings (–25°C to +70°C). Use Value: Guaranteed operation to +85°C junction temperature ensures reliability in hot enclosures; ±25 mV load regulation maintains digital logic integrity during transmit bursts. |
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 1.8 µA typical IQ (7,200× higher than MCP1811BT-033/TT); no shutdown pin. | Suitable for cost-sensitive, non-battery-critical applications where 250 nA IQ is unnecessary. | Select only if ultra-low IQ is not required and board space allows larger 5-lead SOT-23 package. |
| Torex XC6206P332MR-G | 3.3V output, 1 µA IQ, 100 mA max output, SOT-23-3 package; no shutdown function. | Lower output current and higher IQ make it appropriate for sub-100 mA sensor nodes with less aggressive battery life targets. | Choose when supply chain diversification is needed and 150 mA peak load is not required. |
Compared with MCP1700T-3302E/TT and XC6206P332MR-G, the MCP1811BT-033/TT uniquely delivers 150 mA output with 250 nA IQ and integrated shutdown control - making it the only viable option for long-life, high-burst IoT edge nodes where both peak current and nanoamp sleep matter.
Availability
MCP1811BT-033/TT is available at Aetrix Electronics and suitable for energy harvesting sensor nodes, smart medical patches, and industrial wireless sensors requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1811BT-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with a strong focus on low-power and embedded control markets.
The MCP1811 series was designed specifically for ultra-low-power battery-operated applications - targeting multi-year operation in energy-constrained environments like wearables, smart cards, and remote sensors.
FAQ
What is the maximum input voltage rating for the MCP1811BT-033/TT?
The MCP1811BT-033/TT has an absolute maximum input voltage rating of +6.0V per Microchip DS20006088C. However, its operational input range is specified from 1.8V to 5.5V. Exceeding 5.5V may cause permanent damage or violate safe operating area limits, especially at elevated temperatures. Always maintain VIN ≤5.5V in design.
Does the MCP1811BT-033/TT include output discharge functionality?
No, the MCP1811BT-033/TT does not include output discharge. As a member of the MCP1811B variant family, it omits the internal discharge transistor present in MCP1811A devices. When SHDN is pulled low, VOUT remains floating and retains charge until external leakage paths dissipate it - a feature useful in controlled power sequencing.
What output capacitor value is required for stability with the MCP1811BT-033/TT?
A minimum 1.0 µF X7R ceramic capacitor is required between VOUT and GND for stability, as confirmed in DS20006088C Section 4.2. Larger values (e.g., 2.2 µF) improve transient response but are not necessary for basic stability. Avoid using electrolytic or tantalum capacitors unless derated for ESR requirements.
Can the MCP1811BT-033/TT operate from a single alkaline cell?
Yes - the MCP1811BT-033/TT supports input voltages as low as 1.8V, matching the nominal discharge curve of a fresh alkaline AA/AAA cell (1.5V open-circuit, up to 1.65V under light load). With a 600 mV dropout at 150 mA, it can sustain 3.3V output until the cell drops below ~3.9V - covering most of the usable alkaline voltage range.
What is the thermal resistance of the MCP1811BT-033/TT in its SOT-23 package?
In the standard 3-Lead SOT-23 package, the MCP1811BT-033/TT has a junction-to-ambient thermal resistance (θJA) of 211.33°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper, per DS20006088C Table 6-1. This value assumes no thermal vias or enhanced copper pours - layout optimization can significantly reduce actual operating temperature.
MCP1811BT-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
MCP1811BT-033/TT FAQ
1.How can I place an order for MCP1811BT-033/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-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 MCP1811BT-033/TT reliable?
The price and inventory of MCP1811BT-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 MCP1811BT-033/TT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-033/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-033/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-033/TT?
MCP1811BT-033/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-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 MCP1811BT-033/TT?
For technical support, including MCP1811BT-033/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-033/TT requirements.
6.How does Aetrix verify that MCP1811BT-033/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-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 MCP1811BT-033/TT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-033/TT?
All MCP1811BT-033/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-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 MCP1811BT-033/TT part is unused and in its original packaging.
Return procedure for MCP1811BT-033/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1811BT-033/TT Tags
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MIC5504-1.8YM5-TR
Microchip Technology
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MIC5365-3.0YC5-TR
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MIC5365-3.3YC5-TR
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MIC5365-3.3YD5-TR
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