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Microchip Technology MCP1811AT-033/LB
- Part No.:
- MCP1811AT-033/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811AT-033/LB.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1811AT-033/LB from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 3.3V output, 1.8–5.5V input range, and output discharge during shutdown - designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1811AT-033/LB datasheet, MCP1811AT-033/LB pinout, MCP1811AT-033/LB application, or MCP1811AT-033/LB equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options for ultra-low-power LDO selection in space-constrained, multi-year battery applications.
Technical Context
The MCP1811AT-033/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 150 mA) and stable operation with only 1.0 µF ceramic output capacitance. Its internal error amplifier and reference maintain ±4% output accuracy over load (0–150 mA), temperature (−40°C to +85°C), and line (1.8–5.5V) variations.
It features active output discharge via an integrated NMOS switch (RDCH = 100 Ω typical) when SHDN is pulled low, ensuring rapid VOUT decay to prevent back-powering of downstream circuitry. Shutdown current is 10 nA typical, supporting deep-sleep system states without external discharge paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - ensures compatibility with 3.3V logic and RF subsystems without external feedback components. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in microampere-average-current applications like IoT sensors. |
| Max Output Current | 150 mA - sufficient for powering MCUs, BLE radios, and analog front-ends in compact wearable designs. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, LiFePO₄, alkaline, and energy-harvested sources without pre-regulation. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to 3.7V input when output is 3.3V, maximizing usable battery capacity. |
| Shutdown Current | 10 nA typical - reduces standby power to negligible levels, critical for always-on wake-on-event architectures. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - minimizes PCB area and cost while delivering low-noise (<166 µVrms) output performance. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP). Compact footprint ideal for space-constrained wearables and medical implants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5V; requires local 1 µF ceramic bypass capacitor near pin for stability and PSRR. |
| SHDN | Active-low enable/discharge control | Pull low to disable regulator and activate internal discharge switch; high-impedance pull-up required for normal operation. |
| VOUT | Regulated 3.3V output | Delivers up to 150 mA; connects directly to load and 1 µF ceramic output capacitor (X7R). |
| GND | Ground reference | Low-impedance return path for regulator ground current; must connect to quiet ground plane or output capacitor return. |
| EP | Exposed thermal pad | Internally connected to GND; soldering improves thermal resistance (θJA = 91.05°C/W) and reliability under continuous load. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Extends battery life in intermittent-operation devices - e.g., a 220 mAh coin cell powers a sensor node for >12 years at 1 µA average current. |
| Integrated output discharge | Eliminates need for external bleed resistor; discharges VOUT to <100 mV within microseconds after shutdown, preventing latch-up in cascaded regulators. |
| 1 µF ceramic stability | Reduces BOM count and board area vs. traditional tantalum-based LDOs; enables use in flex PCBs and ultra-thin assemblies. |
| 4-Lead UDFN (1×1 mm) | 0.5 mm pitch, 0.45 mm height - fits beneath 0402 passives; thermal pad improves power handling in confined enclosures. |
| −40°C to +85°C operation | Validated across full industrial temperature range; no derating required for wearable or medical ambient conditions. |
Applications
| Energy Harvesting Sensor Node | Smart Hearing Aid |
|---|---|
Use Scenario: Indoor light- or thermal-energy-harvested node measuring temperature/humidity and transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Primary power regulator converting variable harvested voltage (2.0–4.5V) to stable 3.3V for MCU and radio. Use Value: 250 nA quiescent current ensures >95% of harvested energy reaches the load during sleep; 1 µF capacitor enables sub-2 mm² solution size. | Use Scenario: Rechargeable hearing aid using a 35 mAh Li-ion cell requiring multi-week runtime between charges. IC Role / Device Role / Timing Role: Main LDO supplying 3.3V to DSP, microphone bias, and receiver amplifier during active and standby modes. Use Value: Output discharge prevents residual VOUT from interfering with analog signal chain during mute/sleep; 10 nA shutdown current preserves charge during storage. |
| Medical Implantable Monitor | Ultra-Thin Smart Watch |
Use Scenario: Subcutaneous glucose monitor with 10-year target service life powered by primary lithium battery. IC Role / Device Role / Timing Role: Single-point-of-regulation for ultra-low-power ASIC and RF telemetry block. Use Value: Guaranteed ±4% output tolerance over temperature and load ensures consistent sensor excitation and ADC reference stability across patient body temperatures. | Use Scenario: Fitness tracker with OLED display, accelerometer, and heart-rate sensor operating on a 120 mAh pouch cell. IC Role / Device Role / Timing Role: System LDO delivering 3.3V to digital core and analog peripherals during dynamic load transitions. Use Value: 400 mV dropout at 150 mA enables full utilization of battery voltage down to 3.7V, adding ~12% usable capacity versus higher-dropout alternatives. |
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 | Same electrical specs; packaged in 3-lead SOT-23 instead of 4-lead UDFN - larger footprint (2.92 × 1.3 mm), higher θJA (211°C/W), no thermal pad. | Suitable for prototyping or cost-sensitive boards where PCB area is not constrained and thermal margin is adequate. | Select MCP1811AT-033/OT only if manual assembly or legacy layout compatibility is required; UDFN offers superior thermal and size performance. |
| Torex XC6210B332MR-G | 250 nA IQ, 150 mA, 3.3V fixed, but lacks output discharge; shutdown current is 1 µA (vs. 10 nA), and requires 2.2 µF min output cap. | Acceptable where fast VOUT decay is unnecessary and board space allows larger capacitor; not suitable for back-powering-sensitive systems. | Choose only if discharge function is unused and existing design already uses 2.2 µF ceramics; MCP1811AT-033/LB provides tighter integration and lower standby leakage. |
Compared with MCP1811AT-033/OT and XC6210B332MR-G, the MCP1811AT-033/LB uniquely combines UDFN miniaturization, 10 nA shutdown, and integrated discharge in a single 1×1 mm package - making it the optimal choice for next-generation implantables, hearables, and energy-harvested edge nodes demanding zero-compromise ultra-low-power regulation.
Availability
MCP1811AT-033/LB is available at Aetrix Electronics and suitable for energy harvesting sensor nodes, smart hearing aids, and medical implantable monitors requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for MCP1811AT-033/LB 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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1811 family targets ultra-low-power portable and battery-constrained applications - specifically engineered to extend operational lifetime in energy-harvesting, medical, and wearable systems where nanoscale quiescent current and minimal footprint are non-negotiable.
FAQ
What is the maximum input voltage rating for the MCP1811AT-033/LB?
The MCP1811AT-033/LB has an absolute maximum input voltage rating of +6.0V. However, its specified operating input range is 1.8V to 5.5V. Exceeding 5.5V may cause permanent damage or violate safety margins defined in Microchip's DS20006088C datasheet. Always include input transient protection if system-level surges exceed 5.5V.
Does the MCP1811AT-033/LB require an external pull-up resistor on the SHDN pin?
Yes, the MCP1811AT-033/LB requires an external pull-up resistor on the SHDN pin to ensure reliable startup and operation. The datasheet specifies SHDN logic-high threshold as ≥70% of VIN; a 1 MΩ pull-up to VIN is recommended. Without it, the device may remain in shutdown or exhibit erratic enable behavior due to floating input impedance.
Can the MCP1811AT-033/LB operate with a 0.47 µF output capacitor?
No - the MCP1811AT-033/LB 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 load transient response, and output voltage overshoot, especially at light loads or elevated temperatures per Figure 2-5 through 2-8 in DS20006088C.
Is the exposed thermal pad (EP) on the MCP1811AT-033/LB electrically connected?
Yes, the exposed thermal pad (EP) on the MCP1811AT-033/LB is internally connected to GND. It must be soldered to a GND plane using appropriate thermal vias to achieve the specified θJA of 91.05°C/W. Leaving EP unconnected degrades thermal performance and may cause premature thermal shutdown under sustained 150 mA load.
How does the output discharge feature behave during shutdown of the MCP1811AT-033/LB?
When SHDN is pulled low, the MCP1811AT-033/LB disables regulation and activates an internal NMOS discharge switch (RDCH = 100 Ω typical) between VOUT and GND. This discharges a 1 µF output capacitor from 3.3V to <100 mV in <1 ms, preventing back-powering of upstream circuitry or unintended wake events in multi-rail systems.
MCP1811AT-033/LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- SC-70-3
MCP1811AT-033/LB FAQ
1.How can I place an order for MCP1811AT-033/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-033/LB 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/LB reliable?
The price and inventory of MCP1811AT-033/LB 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/LB is usually 5 days.
3.What payment methods are accepted for MCP1811AT-033/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-033/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-033/LB?
MCP1811AT-033/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-033/LB 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/LB?
For technical support, including MCP1811AT-033/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-033/LB requirements.
6.How does Aetrix verify that MCP1811AT-033/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-033/LB 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/LB meets industry standards.
7.What is the process for return or replacement of MCP1811AT-033/LB?
All MCP1811AT-033/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-033/LB, 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/LB part is unused and in its original packaging.
Return procedure for MCP1811AT-033/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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