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Microchip Technology MCP1811BT-033/OT
- Part No.:
- MCP1811BT-033/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811BT-033/OT.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,987
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Product details
Overview
MCP1811BT-033/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 3.3 V output, designed for energy-constrained battery-powered systems. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features overcurrent protection and shutdown mode with 5 nA typical supply current - ideal for wearable electronics and medical hearing aids.
For engineers reviewing the MCP1811BT-033/OT datasheet, MCP1811BT-033/OT pinout, MCP1811BT-033/OT application, or MCP1811BT-033/OT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases in ultra-low-power systems, and validated alternative options for design continuity and supply resilience.
Technical Context
The MCP1811BT-033/OT belongs to the MCP1811B variant family - distinguished by no output discharge function and 5 nA typical shutdown current. Its internal architecture uses a PMOS pass transistor enabling ultra-low IQ while maintaining stable regulation across –40°C to +85°C junction temperature.
It delivers 3.3 V ±4% output accuracy under load currents up to 150 mA, with dropout voltage of 400 mV (typical) at full load. Stability is guaranteed with ≥1.0 µF X7R ceramic output capacitance and requires no external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% - ensures compatibility with 3.3 V logic and MCU I/O domains without external feedback. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin-cell batteries in sleep-mode-dominated applications. |
| Shutdown Current | 5 nA typical - minimizes leakage during system hibernation, critical for energy harvesting and zero-maintenance sensors. |
| Max Output Current | 150 mA - sufficient to power microcontrollers, BLE radios, and analog front-ends in compact wearables. |
| Input Voltage Range | 1.8 V to 5.5 V - supports direct connection to single Li-ion, two alkaline cells, or USB-supplied rails. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to ~3.7 V input when outputting 3.3 V, extending usable battery range. |
| Output Capacitor | 1.0 µF ceramic (X7R) - reduces BOM count and PCB area vs. tantalum; enables low-noise, fast transient response. |
Pinout & Package
Package: 3-Lead SOT-23 - surface-mount, thermally efficient, footprint-compatible with industry-standard passive and discrete footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V unregulated input; must be decoupled with ≥1 µF ceramic capacitor near the pin. |
| VOUT | Regulated output | Delivers stable 3.3 V; connects directly to load and output capacitor; trace routing affects PSRR and noise. |
| GND | Ground reference | Low-impedance return path for regulator ground current only; tie to quiet ground plane or output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in devices drawing <1 µA average current during deep-sleep cycles. |
| No output discharge (MCP1811B) | Prevents unintended discharge of downstream capacitors during shutdown - preserves state in backup circuits. |
| Stable with 1.0 µF ceramic COUT | Eliminates need for larger, less reliable electrolytic/tantalum caps; improves long-term reliability and ESR margin. |
| Overcurrent protection | Current-limit foldback (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 outdoor wearables and medical body-worn devices. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
Use Scenario: Continuous ECG signal acquisition powered by a CR2032 coin cell with periodic BLE transmission. IC Role / Device Role / Timing Role: Primary 3.3 V power rail regulator for ultra-low-power MCU and analog front-end. Use Value: 250 nA quiescent current extends battery life beyond 3 years; 1.0 µF ceramic cap enables miniaturized PCB layout. |
Use Scenario: Indoor light-harvesting node powering a temperature/humidity sensor and sub-GHz RF transceiver. IC Role / Device Role / Timing Role: Voltage regulation stage after supercapacitor buffer, ensuring stable 3.3 V during intermittent energy bursts. Use Value: 5 nA shutdown current prevents parasitic drain during dark periods; wide VIN range accepts variable harvester output. |
| Smart Hearing Aid | Long-Life Smart Card |
Use Scenario: Miniature Class-D audio amplifier and DSP core operating from a zinc-air battery. IC Role / Device Role / Timing Role: Low-noise LDO supplying clean 3.3 V to sensitive analog audio circuitry. Use Value: Ceramic-cap stability and low output noise (<170 µVrms) prevent audible artifacts; SOT-23 fits tight form factor. |
Use Scenario: Contactless payment card with embedded secure element and NFC interface requiring maintenance-free operation. IC Role / Device Role / Timing Role: Power management IC delivering regulated 3.3 V from harvested RF energy or limited onboard storage. Use Value: 1.8 V minimum input enables operation even as battery depletes; no output discharge preserves secure element state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-033/OT | Includes output discharge transistor (RDCH = 100 Ω); 10 nA typical shutdown current vs. 5 nA. | Required where downstream circuitry must be actively discharged during shutdown (e.g., reset sequencing). | Select only if output discharge is explicitly needed; otherwise MCP1811BT-033/OT offers lower shutdown IQ. |
| Torex XC6210B332MR-G | 250 nA IQ, 150 mA output, but 2.0–6.0 V input range and 3.3 V ±2% accuracy; SOT-23-3 pinout identical. | Better output accuracy and wider VIN, but lacks shutdown control pin - always-on operation. | Use when shutdown functionality is unnecessary and tighter output tolerance is prioritized over control flexibility. |
Compared with MCP1811AT-033/OT, the MCP1811BT-033/OT trades output discharge capability for 2× lower shutdown current - critical for multi-year battery life. Against XC6210B332MR-G, it adds active enable control and matches IQ, but sacrifices ±2% accuracy for ±4% and narrower VIN.
Availability
MCP1811BT-033/OT is available at Aetrix Electronics and suitable for wearable electronics, medical hearing aids, and energy-harvesting sensor nodes requiring stable component supply with long-lifecycle assurance.
Supply support for MCP1811BT-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 is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1811X/12X product line was engineered specifically for ultra-low-power, battery-constrained applications - emphasizing nanoscale quiescent current, minimal external components, and robust operation across extended temperature ranges.
FAQ
What is the maximum input voltage rating for the MCP1811BT-033/OT?
The MCP1811BT-033/OT has an absolute maximum input voltage rating of +6.0 V. However, its operational input range is specified from 1.8 V to 5.5 V. Exceeding 5.5 V may cause functional instability or accelerated parametric drift, and sustained operation above 6.0 V risks permanent damage per the Absolute Maximum Ratings table in DS20006088C.
Does the MCP1811BT-033/OT include an enable/shutdown pin?
Yes, the MCP1811BT-033/OT includes a dedicated SHDN pin (pin 1 in 3-lead SOT-23). When pulled low (≤20% VIN), it places the device in shutdown mode with 5 nA typical supply current. The pin is internally pulled up and requires no external resistor unless driven actively.
Can the MCP1811BT-033/OT operate with a 0.47 µF output capacitor?
No - the MCP1811BT-033/OT 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 transient response, and potential output voltage overshoot, as confirmed in Section 4.2 and Figure 2-5 of DS20006088C.
Is the MCP1811BT-033/OT pin-compatible with other variants in the MCP1811X family?
Yes - the MCP1811BT-033/OT in 3-lead SOT-23 shares identical pinout (VIN–VOUT–GND) with all other 3-lead variants including MCP1811AT-033/OT and MCP1811B-033/OT. This allows drop-in replacement within the same package, provided functional differences (e.g., output discharge) are accounted for in system design.
What is the thermal resistance (θJA) of the MCP1811BT-033/OT in SOT-23?
The MCP1811BT-033/OT in 3-lead SOT-23 has a typical 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. This value assumes standard layout practices; adding thermal vias or copper pour can significantly reduce effective θJA in production designs.
MCP1811BT-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
MCP1811BT-033/OT FAQ
1.How can I place an order for MCP1811BT-033/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-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 MCP1811BT-033/OT reliable?
The price and inventory of MCP1811BT-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 MCP1811BT-033/OT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-033/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-033/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-033/OT?
MCP1811BT-033/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-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 MCP1811BT-033/OT?
For technical support, including MCP1811BT-033/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-033/OT requirements.
6.How does Aetrix verify that MCP1811BT-033/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-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 MCP1811BT-033/OT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-033/OT?
All MCP1811BT-033/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-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 MCP1811BT-033/OT part is unused and in its original packaging.
Return procedure for MCP1811BT-033/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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