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Microchip Technology MCP1811AT-018/LT
- Part No.:
- MCP1811AT-018/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811AT-018/LT.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,816
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Product details
Overview
MCP1811AT-018/LT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 1.8 V output, designed for energy harvesting and long-life battery-powered systems. It operates from 1.8 V to 5.5 V input, features output discharge during shutdown, and remains stable with only 1.0 µF ceramic output capacitance - enabling compact, low-noise power delivery in wearable medical devices and smart cards.
For engineers reviewing the MCP1811AT-018/LT datasheet, MCP1811AT-018/LT pinout, MCP1811AT-018/LT application, or MCP1811AT-018/LT equivalent, this page delivers verified electrical specs, package mapping, thermal performance data, functional role in ultra-low-power sleep/wake architectures, and validated alternative options for design continuity.
Technical Context
The MCP1811AT-018/LT implements a P-channel MOSFET pass element with internal error amplifier and overcurrent protection, delivering regulated 1.8 V output across –40°C to +85°C junction temperature. Its 250 nA quiescent current and 10 nA shutdown current (MCP1811A variant) enable multi-year operation on coin cells or harvested energy sources.
It supports fast start-up (400 µs delay, 200–1000 µs rise time) and maintains ±25 mV load regulation from 1 mA to 150 mA. The device includes an integrated discharge transistor (100 Ω typical) that actively pulls VOUT to GND when SHDN = GND - eliminating residual voltage hold-up in power-gated subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures compatibility with 1.8 V logic families (e.g., microcontrollers, sensors) without external feedback components. |
| Max Output Current | 150 mA - sufficient to power low-power MCUs, BLE radios, or analog front-ends in compact wearables. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load applications using CR2032 cells. |
| Shutdown Current | 10 nA typical - reduces standby drain to negligible levels during deep-sleep modes. |
| Dropout Voltage | 400 mV at 150 mA - allows operation down to VIN = 2.2 V while maintaining regulation, critical for fading battery voltages. |
| Stability Capacitance | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, reducing board area and cost. |
| PSRR | –50 dB at 1 kHz - suppresses ripple from noisy switching supplies or shared rails in mixed-signal systems. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA compliant. Compact 2.92 mm × 1.3 mm footprint with exposed pad option not present in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin to ensure stability and transient response. |
| VOUT | Regulated output | Delivers fixed 1.8 V; requires ≥1.0 µF ceramic output capacitor tied directly to GND for loop stability and noise reduction. |
| GND | Ground reference | Low-impedance return path for load and regulator ground current; tie directly to quiet ground plane or output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year operation on 220 mAh coin cell powering 1 µA average-load sensor node. |
| Output discharge (DT) | 100 Ω discharge transistor actively drains VOUT to GND in shutdown - prevents back-powering of upstream circuitry. |
| Ceramic-capacitor stability | Eliminates ESR requirements and simplifies layout; supports miniaturized 0402/0603 MLCCs for space-constrained wearables. |
| Wide input range (1.8–5.5 V) | Supports direct connection to single-cell Li-ion (3.0–4.2 V), alkaline (1.8–3.0 V), or energy-harvesting storage capacitors. |
| Overcurrent protection | Foldback current limit (50 mA) prevents thermal runaway during short-circuit events without latch-up or reset dependency. |
Applications
| Energy Harvesting Node | Smart Card Power Management |
|---|---|
|
Use Scenario: Indoor light or thermal energy harvester powers a BLE sensor node with intermittent wake cycles. IC Role / Device Role / Timing Role: Primary LDO supplying 1.8 V to MCU and RF transceiver during active bursts; enters 10 nA shutdown between transmissions. Use Value: 250 nA quiescent current extends usable runtime per harvest cycle by >3× versus standard LDOs, enabling maintenance-free deployment. |
Use Scenario: Contactless payment card with embedded secure element and NFC interface requiring regulated 1.8 V rail. IC Role / Device Role / Timing Role: Single-output LDO converting NFC field-induced voltage to stable 1.8 V for secure IC and memory access. Use Value: 1.0 µF ceramic stability and 400 mV dropout allow reliable startup from weak, variable NFC coupling - no bootstrapping required. |
| Wearable Medical Sensor | Hearing Aid Front-End |
|
Use Scenario: Miniature hearable device with accelerometer, PPG sensor, and Bluetooth LE, powered by rechargeable micro-battery. IC Role / Device Role / Timing Role: Always-on 1.8 V supply for sensor biasing and digital logic; output discharge clears residual charge before firmware-initiated reset. Use Value: Output discharge (100 Ω DT) reduces VOUT decay time to <1 ms, ensuring deterministic power sequencing and eliminating reset glitches. |
Use Scenario: Analog front-end in hearing aid requiring ultra-low-noise 1.8 V for microphone preamp and ADC. IC Role / Device Role / Timing Role: Low-noise LDO providing clean 1.8 V rail; PSRR of –50 dB at 1 kHz attenuates switching noise from adjacent DC/DC converters. Use Value: 169 µVrms integrated output noise (10 Hz–100 kHz) preserves signal integrity in 100 dB SNR audio paths without additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/MB | Same 1.8 V output, 250 nA IQ, but no output discharge; 150 mA rating; SOT-23-3 package. | Lacks active VOUT discharge - unsuitable where rapid rail collapse is required for safe reset or isolation. | Select when output discharge is unnecessary and lowest possible BOM count is prioritized. |
| Torex XC6210B182MR-G | 1.8 V, 250 nA IQ, 150 mA, no discharge; 3-pin SOT-23; ±2% output tolerance (tighter than MCP1811A's ±4%). | Higher initial accuracy but no discharge function; slightly lower PSRR (–45 dB @1 kHz). | Choose for precision voltage-critical analog circuits where discharge is handled externally. |
Compared with MCP1700T-1802E/MB and XC6210B182MR-G, the MCP1811AT-018/LT uniquely integrates output discharge while matching ultra-low IQ and 150 mA capability - making it the only drop-in solution for designs requiring both nanowatt standby and controlled power-rail collapse.
Availability
MCP1811AT-018/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card platforms requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1811AT-018/LT 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 with high-reliability semiconductor products.
The MCP1811A/B series was engineered specifically for ultra-low-power, battery-constrained applications - emphasizing sub-µA quiescent operation, minimal external components, and robust performance across wide temperature and load ranges.
FAQ
What is the maximum input voltage rating for the MCP1811AT-018/LT?
The MCP1811AT-018/LT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V is not recommended, as the specified input operating range is 1.8 V to 5.5 V. Exceeding 6.0 V risks permanent damage per the Absolute Maximum Ratings table in DS20006088C.
Does the MCP1811AT-018/LT require an external pull-up resistor on the SHDN pin?
Yes - the MCP1811AT-018/LT SHDN pin is active-low and internally unconnected. A 1 MΩ pull-up resistor to VIN is recommended per the datasheet (Figure 2-44 test condition) to ensure reliable turn-on and prevent floating-state instability during power-up or noise events.
Can the MCP1811AT-018/LT operate with a 0.47 µF output capacitor?
No - the MCP1811AT-018/LT requires a minimum of 1.0 µF ceramic (X7R) output capacitance for guaranteed stability, as confirmed in Table 1-1 and Section 4.2 of DS20006088C. Using 0.47 µF may cause oscillation or poor transient response, especially under load steps.
Is the MCP1811AT-018/LT pin-compatible with other variants in the MCP1811X family?
Yes - the MCP1811AT-018/LT uses the standard 3-lead SOT-23 package with identical pinout (VIN, VOUT, GND) as all other MCP1811A/11B/12A/12B variants in the same package type, enabling drop-in replacement for different output voltages or discharge configurations.
What is the thermal resistance (θJA) of the MCP1811AT-018/LT in its SOT-23 package?
The MCP1811AT-018/LT in 3-lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper, as documented in Table 6-1 of DS20006088C. This value assumes standard PCB layout with no thermal vias or copper pour enhancements.
MCP1811AT-018/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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-70-5
MCP1811AT-018/LT FAQ
1.How can I place an order for MCP1811AT-018/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-018/LT 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/LT reliable?
The price and inventory of MCP1811AT-018/LT 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/LT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-018/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-018/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-018/LT?
MCP1811AT-018/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-018/LT 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/LT?
For technical support, including MCP1811AT-018/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-018/LT requirements.
6.How does Aetrix verify that MCP1811AT-018/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-018/LT 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/LT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-018/LT?
All MCP1811AT-018/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-018/LT, 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/LT part is unused and in its original packaging.
Return procedure for MCP1811AT-018/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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