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Microchip Technology MCP1811AT-018/LB
- Part No.:
- MCP1811AT-018/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811AT-018/LB.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,936
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Product details
Overview
MCP1811AT-018/LB from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 1.8 V output, 1.8–5.5 V input range, and output discharge functionality during shutdown. It operates across –40°C to +85°C and is stable with a 1.0 µF ceramic output capacitor - ideal for energy harvesting and long-life battery-powered wearable electronics.
For engineers reviewing the MCP1811AT-018/LB datasheet, MCP1811AT-018/LB pinout, MCP1811AT-018/LB application, or MCP1811AT-018/LB equivalent, this page delivers verified electrical specs, package mapping to 4-lead 1×1 mm UDFN, functional role in ultra-low-power systems, and real-world alternative selection guidance grounded in Microchip's official family documentation.
Technical Context
The MCP1811AT-018/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 150 mA) and minimal ground current (90–110 µA). Its integrated discharge transistor (RDCH = 100 Ω typical) actively pulls VOUT to GND when SHDN = GND, eliminating residual voltage on downstream circuitry during sleep mode.
This device belongs to the MCP1811A subfamily - distinguished from MCP1811B by inclusion of output discharge and from MCP1812 variants by its 150 mA output rating. It supports fixed 1.8 V regulation with ±4% output accuracy over load (1 mA–150 mA), temperature (–40°C to +85°C), and line (VIN ≥ 2.0 V) conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures stable core/bias rail for 1.8 V logic and ultra-low-power MCUs without external feedback. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or harvested energy sources in always-on sensor nodes. |
| Max Output Current | 150 mA - sufficient to power BLE SoCs, low-power displays, or sensor signal chains while maintaining low IQ. |
| Input Voltage Range | 1.8 V to 5.5 V - supports direct connection to single-cell Li-ion, LiFePO₄, or multi-cell alkaline batteries. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to VIN = 2.2 V while delivering full 1.8 V output. |
| Output Capacitor | 1.0 µF ceramic (X7R) - reduces BOM cost/size vs. tantalum and enables fast transient response in compact wearables. |
| Shutdown Current | 10 nA typical - minimizes leakage during deep-sleep states, critical for >10-year battery life targets. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP). Optimized for space-constrained PCBs in wearables and medical patches; thermal resistance θJA = 91.05°C/W on JEDEC 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor to minimize noise coupling into regulation loop. |
| SHDN | Active-low enable/discharge control | Pulled high internally; drives <20% VIN to disable regulator and activate VOUT discharge path to GND. |
| VOUT | Regulated 1.8 V output | Delivers up to 150 mA; must be decoupled with ≥1.0 µF X7R ceramic capacitor placed adjacent to pin. |
| GND | Power and reference ground | Low-impedance return path for load and internal circuitry; connects directly to output capacitor ground terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 coin cell in intermittent-sensing applications (e.g., environmental monitors). |
| Integrated VOUT discharge | Eliminates need for external bleed resistor; ensures rapid, controlled VOUT decay to GND during shutdown. |
| Stable with 1 µF ceramic COUT | Reduces solution size by >50% vs. traditional LDOs requiring ≥10 µF tantalum, lowering bill-of-materials cost. |
| PSRR >50 dB @ 1 kHz | Maintains clean 1.8 V rail despite noisy input sources (e.g., switching DC-DC converters or RF transceivers). |
| Overcurrent protection | Current-limit foldback (50 mA typical) prevents thermal runaway during short-circuit events without latch-up. |
Applications
| Energy Harvesting Node | Smart Wearable Sensor |
|---|---|
Use Scenario: Indoor light or thermal energy harvester powering a wireless temperature node with 10-second wake intervals. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 1.8 V to MCU, sensor, and BLE radio during active bursts. Use Value: 250 nA quiescent current extends usable harvest window; 1 µF ceramic stability simplifies layout in miniature PCBs. |
Use Scenario: Compact wrist-worn health monitor with optical heart-rate sensor and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Supplies regulated 1.8 V to analog front-end and digital subsystem during measurement cycles. Use Value: Output discharge clears residual charge before sleep, preventing false wake-ups; 4-mm² UDFN fits tight form factors. |
| Hearing Aid Power Management | Long-Life IoT Tracker |
Use Scenario: Rechargeable hearing aid using microbattery and requiring silent, ripple-free bias for audio amplifiers. IC Role / Device Role / Timing Role: Low-noise LDO providing clean 1.8 V rail to precision op-amps and ADCs in analog signal chain. Use Value: PSRR >50 dB suppresses switching noise from charging IC; ±4% output tolerance meets audio IC supply specs. |
Use Scenario: Asset tracker deployed in remote locations with primary power from AA alkaline cells. IC Role / Device Role / Timing Role: Regulates 1.8 V for GPS module, MCU, and cellular modem during periodic location reporting. Use Value: 1.8 V input capability enables operation down to end-of-battery voltage; 10 nA shutdown current preserves shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-018/OT | Same electrical specs and 1.8 V output, but in 3-lead SOT-23 package (no SHDN pin; always-on operation). | Lacks shutdown control and output discharge; suitable only for always-on systems where IQ savings are secondary to simplicity. | Select when board space permits larger SOT-23 and system-level power gating is handled externally. |
| Torex XC6210B182MR-G | 150 mA, 1.8 V fixed, 350 nA IQ, no output discharge, SC-70-4 package; dropout 300 mV @ 100 mA. | Lower dropout but higher IQ and no discharge path; requires external resistor for VOUT bleed if needed. | Choose when minimizing dropout is critical and external discharge circuitry is acceptable. |
Compared with MCP1811AT-018/OT and XC6210B182MR-G, the MCP1811AT-018/LB uniquely combines ultra-low 250 nA IQ, integrated output discharge, and 4-lead UDFN packaging - making it optimal for space- and energy-constrained designs requiring autonomous shutdown behavior.
Availability
MCP1811AT-018/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and long-life IoT trackers requiring stable component supply with guaranteed longevity and traceable sourcing.
Supply support for MCP1811AT-018/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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets.
The MCP1811A family was designed specifically for ultra-low-power, battery- and energy-harvesting–powered applications demanding nanoscale quiescent current and minimal solution footprint - targeting wearables, medical implants, and remote sensing nodes.
FAQ
What is the maximum continuous output current of the MCP1811AT-018/LB?
The MCP1811AT-018/LB delivers up to 150 mA of continuous output current while maintaining regulation and thermal stability under specified conditions. This rating applies across the full operating temperature range (–40°C to +85°C) and input voltage range (≥2.0 V), with dropout voltage rising to 600 mV maximum at full load.
Does the MCP1811AT-018/LB require an external discharge resistor?
No - the MCP1811AT-018/LB integrates a dedicated discharge transistor (RDCH ≈ 100 Ω) that actively pulls VOUT to GND when SHDN is driven low. This eliminates the need for external bleed resistors, reducing component count and PCB area while ensuring predictable discharge timing.
Which output capacitor value is required for stability with the MCP1811AT-018/LB?
The MCP1811AT-018/LB is stable with a minimum 1.0 µF X7R ceramic output capacitor. Microchip specifies this value for all MCP1811X devices; using smaller or non-ceramic capacitors may cause oscillation or degraded transient response.
What is the input voltage range for the MCP1811AT-018/LB?
The MCP1811AT-018/LB operates over an input voltage range of 1.8 V to 5.5 V. For reliable 150 mA output at 1.8 V, VIN must be ≥2.0 V per datasheet AC/DC specifications; lower VIN limits output current to maintain regulation.
How does the shutdown function affect quiescent current in the MCP1811AT-018/LB?
When SHDN is pulled low, the MCP1811AT-018/LB enters shutdown mode with typical supply current of 10 nA - a 25× reduction versus its 250 nA operating IQ. This ultra-low shutdown current is critical for extending battery life in intermittently active systems.
MCP1811AT-018/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):
- 1.8V
- 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-018/LB FAQ
1.How can I place an order for MCP1811AT-018/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-018/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-018/LB reliable?
The price and inventory of MCP1811AT-018/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-018/LB is usually 5 days.
3.What payment methods are accepted for MCP1811AT-018/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-018/LB transactions.
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4.How is shipping managed for MCP1811AT-018/LB?
MCP1811AT-018/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-018/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-018/LB?
For technical support, including MCP1811AT-018/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-018/LB requirements.
6.How does Aetrix verify that MCP1811AT-018/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-018/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-018/LB meets industry standards.
7.What is the process for return or replacement of MCP1811AT-018/LB?
All MCP1811AT-018/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-018/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-018/LB part is unused and in its original packaging.
Return procedure for MCP1811AT-018/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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