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Microchip Technology MCP1811BT-040/OT
- Part No.:
- MCP1811BT-040/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811BT-040/OT.pdf
- Description:
- IC REG LINEAR 4V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,131
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Product details
Overview
MCP1811BT-040/OT from Microchip Technology is a 150 mA ultra-low quiescent current (250 nA typical) fixed-output 4.0 V low-dropout linear regulator in SOT-23-3 package, designed for energy harvesting and long-life battery-powered systems requiring stable voltage under microampere load conditions and shutdown current as low as 5 nA (MCP1811B variant).
For engineers reviewing the MCP1811BT-040/OT datasheet, MCP1811BT-040/OT pinout, MCP1811BT-040/OT application, or MCP1811BT-040/OT equivalent, this page delivers verified electrical specs, thermal performance data, ceramic-capacitor stability requirements, and real-world use cases in wearable medical and ultra-low-power IoT edge nodes.
Technical Context
The MCP1811BT-040/OT implements a PMOS pass transistor architecture enabling dropout voltage as low as 400 mV at 150 mA while maintaining 250 nA operating IQ. Its internal reference and error amplifier deliver ±4% output voltage accuracy over -40°C to +85°C junction temperature range.
It features active output discharge only in MCP1811A variants; the "T" suffix and "B" designation in MCP1811BT confirm it is the no-discharge version (5 nA shutdown current), with SHDN pin logic-controlled enable/disable and integrated overcurrent protection with foldback limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures stable rail for 3.3 V–4.2 V Li-ion/Li-poly powered MCUs without external feedback. |
| Max Output Current | 150 mA - supports moderate-current peripherals (BLE radios, sensors, small displays) in compact wearables. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in sleep-dominated duty cycles. |
| Shutdown Current | 5 nA typical - critical for energy harvesting systems where leakage must be minimized during ambient-energy dormancy. |
| Input Voltage Range | 1.8 V to 5.5 V - accommodates single-cell LiFePO₄ (2.0–3.6 V), alkaline (0.9–1.5 V × 2), and supercapacitor-backed inputs. |
| Dropout Voltage | 400 mV @ 150 mA - allows regulation down to ~4.4 V input, maximizing usable energy from depleting batteries. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - reduces BOM count and PCB area vs. tantalum; enables sub-2 mm² total solution size. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor placed within 2 mm of pin for PSRR and transient response. |
| VOUT | Regulated output | Delivers fixed 4.0 V; connects directly to load and output capacitor anode; trace width ≥0.25 mm recommended. |
| GND | Power ground reference | Low-impedance return path for ground current (≤110 µA); must tie to quiet ground plane near output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical enables >10-year runtime on 220 mAh CR2032 when load draws <1 µA average. |
| No-output-discharge topology | Eliminates VOUT pull-down circuitry, reducing die area and enabling faster wake-up from shutdown (no discharge delay). |
| Ceramic-capacitor stability | Guaranteed stable with 1.0 µF X7R MLCC - avoids ESR dependency and simplifies layout vs. electrolytic/tantalum solutions. |
| Overcurrent foldback | Limits short-circuit current to ~50 mA at 1 Ω load - protects IC and source during fault without thermal runaway. |
| Wide temperature operation | -40°C to +85°C junction range supports deployment in outdoor sensor nodes and medical body-worn devices. |
Applications
| Energy Harvesting Node | Smart Hearing Aid |
|---|---|
Use Scenario: Indoor light-harvesting system powering a BLE temperature sensor using amorphous silicon photodiode and storage capacitor. IC Role / Device Role / Timing Role: Primary 4.0 V power rail regulator, enabling MCU and radio operation during intermittent energy availability. Use Value: 5 nA shutdown current preserves harvested microjoules during dark periods; 250 nA IQ extends operational window per charge cycle. | Use Scenario: Rechargeable hearing aid using 3.7 V Li-ion cell with deep-sleep firmware cycles. IC Role / Device Role / Timing Role: Supplies clean 4.0 V bias to ultra-low-power DSP and MEMS microphone preamp. Use Value: 400 mV dropout sustains regulation until battery reaches 4.4 V, recovering ~15% additional usable capacity vs. higher-dropout alternatives. |
| Wearable Fitness Tracker | Implantable Medical Sensor |
Use Scenario: Wrist-worn activity monitor with optical heart-rate sensor and accelerometer, powered by 120 mAh Li-poly. IC Role / Device Role / Timing Role: Provides stable 4.0 V rail to analog front-end and Bluetooth LE SoC during motion-induced voltage transients. Use Value: 1.0 µF ceramic stability eliminates capacitor aging drift; ±4% output tolerance ensures ADC reference accuracy across temperature. | Use Scenario: Subcutaneous glucose monitor with 10-year target service life and periodic RF telemetry bursts. IC Role / Device Role / Timing Role: Regulates 4.0 V for CMOS sensor interface and secure wireless transmitter during brief active windows. Use Value: 250 nA IQ contributes <0.1% of total system sleep current, directly extending implant lifetime beyond ISO 14708 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-040/OT | Includes active output discharge (100 Ω RDCH); 10 nA shutdown current vs. 5 nA | Required where rapid VOUT discharge after shutdown prevents floating node issues (e.g., mixed-voltage FPGA I/O) | Select only if discharge functionality is explicitly needed; otherwise MCP1811BT-040/OT offers lower shutdown IQ and simpler control. |
| Torex XC6210B402MR-G | 250 nA IQ, 4.0 V output, SOT-23-3, but 200 mA max output and 300 mV dropout @ 100 mA | Better dropout at light loads; lacks overcurrent foldback and specified 5 nA shutdown mode | Prefer for space-constrained designs needing marginally lower dropout; verify foldback protection sufficiency for end-equipment safety. |
Compared with MCP1811AT-040/OT and XC6210B402MR-G, the MCP1811BT-040/OT uniquely balances ultra-low shutdown IQ (5 nA), guaranteed ceramic stability, and integrated foldback protection-making it optimal for energy-autonomous and long-service-life medical/wearable applications where leakage and fault resilience are co-critical.
Availability
MCP1811BT-040/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical devices, and smart card readers requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1811BT-040/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 microcontroller, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1811 family was engineered specifically for ultra-low-power battery and energy-harvesting systems, emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust thermal performance in miniature packages.
FAQ
What is the maximum input voltage rating for MCP1811BT-040/OT?
The MCP1811BT-040/OT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V violates the recommended operating conditions and risks permanent damage. For reliable long-term use, VIN must remain between 1.8 V and 5.5 V, with minimum VIN determined by load current and dropout voltage (e.g., ≥4.4 V for 150 mA output at 4.0 V).
Does MCP1811BT-040/OT include output discharge functionality?
No, MCP1811BT-040/OT does not include output discharge. The "B" in the part number designates the no-discharge variant (MCP1811B), confirmed by its 5 nA typical shutdown current and absence of the RDCH transistor. Only MCP1811A variants (e.g., MCP1811AT-040/OT) provide active VOUT discharge via a 100 Ω internal switch.
What output capacitor value is required for stable operation of MCP1811BT-040/OT?
MCP1811BT-040/OT requires a minimum 1.0 µF X7R ceramic capacitor (1206 or smaller) placed adjacent to the VOUT and GND pins. This value is validated for phase margin >45° and transient response stability across -40°C to +85°C. Larger values (e.g., 2.2 µF) improve ripple rejection but are not required.
Can MCP1811BT-040/OT operate with a 1.8 V input while delivering 4.0 V output?
No. MCP1811BT-040/OT cannot regulate 4.0 V output from a 1.8 V input due to physics: the output voltage cannot exceed the input. The device requires VIN ≥ VOUT + VDROPOUT. At 150 mA, dropout is 400–600 mV, so minimum VIN is ~4.4–4.6 V. For 1.8 V input, a boost converter must precede the MCP1811BT-040/OT.
Is MCP1811BT-040/OT pin-compatible with other members of the MCP1811/12 family in SOT-23-3?
Yes, all MCP1811X and MCP1812X variants in the 3-lead SOT-23 package share identical pinout (VIN–VOUT–GND). However, functional differences exist: MCP1811BT-040/OT provides fixed 4.0 V output and no discharge, whereas MCP1812 variants deliver 300 mA and require 2.2 µF output capacitance. Swapping requires verifying output current and capacitor requirements.
MCP1811BT-040/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):
- 4V
- 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-040/OT FAQ
1.How can I place an order for MCP1811BT-040/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-040/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-040/OT reliable?
The price and inventory of MCP1811BT-040/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-040/OT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-040/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-040/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-040/OT?
MCP1811BT-040/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-040/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-040/OT?
For technical support, including MCP1811BT-040/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-040/OT requirements.
6.How does Aetrix verify that MCP1811BT-040/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-040/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-040/OT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-040/OT?
All MCP1811BT-040/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-040/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-040/OT part is unused and in its original packaging.
Return procedure for MCP1811BT-040/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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