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Microchip Technology MCP1811AT-018/OT
- Part No.:
- MCP1811AT-018/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811AT-018/OT.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,491
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Product details
Overview
MCP1811AT-018/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical), 150 mA low-dropout linear regulator with fixed 1.8 V output, shutdown capability (10 nA typical), and stable operation with 1.0 µF ceramic output capacitor. It operates across 1.8–5.5 V input and targets energy harvesting and long-life battery-powered systems where sleep-mode power budget is critical.
For engineers reviewing the MCP1811AT-018/OT datasheet, MCP1811AT-018/OT pinout, MCP1811AT-018/OT application, or MCP1811AT-018/OT equivalent, this page delivers verified package mapping (SOT-23), confirmed shutdown discharge function, exact output voltage tolerance (±4%), thermal resistance (θJA = 211.33°C/W), and validated alternatives for ultra-low-power LDO replacement in wearable and medical edge devices.
Technical Context
The MCP1811AT-018/OT implements a CMOS-based LDO architecture with internal error amplifier, overcurrent protection, and integrated discharge transistor activated during SHDN = GND. Its 400 mV dropout at 150 mA enables regulation from 2.2 V input when delivering 1.8 V output.
It supports fast start-up (400 µs delay, 200–1000 µs rise time) and maintains ±25 mV load regulation across 1–150 mA while rejecting supply ripple at –50 dB (1 kHz, no CIN). The device is specified for –40°C to +85°C junction temperature and rated for unlimited output short-circuit duration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures stable core voltage for 1.8 V logic rails without external feedback. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-dominated applications like sensor nodes. |
| Shutdown Current | 10 nA typical - reduces system standby power to negligible levels during deep-sleep modes. |
| Max Output Current | 150 mA - sufficient for microcontrollers, BLE radios, and analog front-ends in compact wearables. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting sources. |
| Dropout Voltage | 400 mV @ 150 mA - allows regulation down to VIN = 2.2 V, maximizing usable battery capacity. |
| Output Capacitor | 1.0 µF ceramic (X7R) - minimizes board area and cost while ensuring stability and low noise. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), surface-mount, lead-free, RoHS-compliant. Thermal resistance θJA = 211.33°C/W on JEDEC 4-layer FR4 board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 1.8–5.5 V unregulated input; requires local 1 µF ceramic bypass capacitor. |
| 2 (GND) | Ground reference | Low-impedance return path for regulator ground current only; tie directly to output capacitor ground. |
| 3 (VOUT) | Regulated output | Delivers stable 1.8 V ±4%; requires 1.0 µF X7R ceramic capacitor for loop stability and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical - extends battery life in duty-cycled IoT sensors by minimizing idle power loss. |
| Output discharge on shutdown | Active discharge via internal transistor (RDCH = 100 Ω) - prevents residual voltage hold-up on VOUT during sleep. |
| Ceramic capacitor stability | Stable with 1.0 µF X7R - eliminates need for larger, more expensive tantalum or aluminum electrolytic capacitors. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) - protects against short circuits without thermal runaway. |
| Wide temperature range | –40°C to +85°C operating junction - suitable for industrial and medical environments without derating. |
Applications
| Energy Harvesting Node | Smart Wearable Sensor |
|---|---|
|
Use Scenario: Powering a self-sustaining environmental sensor node powered by a thermoelectric generator or solar cell with intermittent, low-current output. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 1.8 V to ultra-low-power MCU and RF transceiver during burst transmission. Use Value: 250 nA quiescent current enables >99.9% duty-cycle sleep, allowing full operation from microwatt-level harvested energy. |
Use Scenario: Regulating power for a wrist-worn health monitor with optical heart-rate sensor and BLE radio. IC Role / Device Role / Timing Role: Supplies clean 1.8 V to analog front-end and digital subsystem; shuts down during motion-inactive periods. Use Value: 10 nA shutdown current extends coin-cell battery life beyond 2 years while maintaining instant wake-up capability. |
| Hearing Aid Audio Front-End | Secure Smart Card |
|
Use Scenario: Providing regulated 1.8 V to low-noise microphone preamp and ADC in a battery-constrained hearing aid. IC Role / Device Role / Timing Role: Low-noise LDO delivering stable rail for analog signal chain; rejects switching noise from digital core. Use Value: 169.31 µVrms output noise (10 Hz–100 kHz) preserves SNR in audio band without additional filtering. |
Use Scenario: Powering contactless smart card IC during NFC field coupling, where supply must ramp cleanly and rapidly. IC Role / Device Role / Timing Role: Fast-starting LDO (400 µs delay, 200–1000 µs rise) enabling immediate secure transaction upon field detection. Use Value: 200 µs minimum rise time ensures compliant power-on timing per ISO/IEC 14443 Type A/B specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | Same 1.8 V output, 250 nA IQ, but no output discharge; 6 V max input; SC70-3 package. | Lacks active VOUT discharge - unsuitable where residual voltage must be cleared during shutdown. | Select when board space is constrained (SC70 smaller than SOT-23) and discharge is not required. |
| Torex XC6206P182MR-G | 1.8 V, 1 µA IQ (4× higher), 100 mA output, no shutdown pin; SOT-23-3 pinout identical. | No enable/shutdown control - always-on operation; lower output current limits peak load handling. | Choose for cost-sensitive designs where 1 µA IQ is acceptable and continuous regulation suffices. |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the MCP1811AT-018/OT uniquely combines 10 nA shutdown, active output discharge, and 150 mA drive in SOT-23 - making it the only option for high-reliability, deeply sleep-optimized systems requiring rapid, clean power cycling.
Availability
MCP1811AT-018/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and secure smart cards requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811AT-018/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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1811A/B family was designed specifically for ultra-low-power, battery- and energy-harvesting–powered applications demanding nanoscale quiescent current, fast transient response, and minimal external components - targeting next-generation wearables and edge AI sensors.
FAQ
What is the maximum input voltage rating for the MCP1811AT-018/OT?
The MCP1811AT-018/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 permanent damage or violate reliability specifications, even if below the 6.0 V absolute maximum.
Does the MCP1811AT-018/OT include output discharge functionality?
Yes, the MCP1811AT-018/OT includes active output discharge: when the SHDN pin is pulled low, an internal transistor discharges the VOUT capacitor through a 100 Ω path. This feature is confirmed in Table 1-1 and Figure 1-1 of DS20006088C, distinguishing it from the 'B' variant (e.g., MCP1811BT-018/OT).
What is the minimum output capacitance required for stability with the MCP1811AT-018/OT?
The MCP1811AT-018/OT requires a minimum 1.0 µF X7R ceramic output capacitor for guaranteed stability across all operating conditions. This value is explicitly stated in the "Stable with Ceramic Output Capacitor" feature list and Electrical Characteristics table under COUT conditions.
Can the MCP1811AT-018/OT operate at –40°C ambient temperature?
Yes, the MCP1811AT-018/OT is fully specified for operation across –40°C to +85°C junction temperature. Its electrical characteristics-including dropout voltage, load regulation, and quiescent current-are tested and guaranteed across this full range, as confirmed in the Temperature Specifications table (DS20006088C, page 6).
Is the MCP1811AT-018/OT pin-compatible with other members of the MCP1811X/12X family in SOT-23?
Yes, all 3-lead SOT-23 variants in the MCP1811X/12X family-including MCP1811AT-018/OT, MCP1811AT-330/OT, and MCP1812AT-180/OT-share identical pinout (VIN, GND, VOUT) and footprint. However, output current capability (150 mA vs. 300 mA) and shutdown discharge presence differ between A/B and 11/12 variants.
MCP1811AT-018/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):
- 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:
- SOT-23-5
MCP1811AT-018/OT FAQ
1.How can I place an order for MCP1811AT-018/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-018/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 MCP1811AT-018/OT reliable?
The price and inventory of MCP1811AT-018/OT 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/OT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-018/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-018/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-018/OT?
MCP1811AT-018/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-018/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 MCP1811AT-018/OT?
For technical support, including MCP1811AT-018/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-018/OT requirements.
6.How does Aetrix verify that MCP1811AT-018/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-018/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 MCP1811AT-018/OT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-018/OT?
All MCP1811AT-018/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-018/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 MCP1811AT-018/OT part is unused and in its original packaging.
Return procedure for MCP1811AT-018/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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