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Microchip Technology MCP1811AT-028/TT
- Part No.:
- MCP1811AT-028/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811AT-028/TT.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,614
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Product details
Overview
MCP1811AT-028/TT from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO linear regulator with fixed 2.8 V output, 250 nA typical IQ, and output discharge functionality (MCP1811A variant). It operates from 1.8 V to 5.5 V input and is stable with a 1.0 µF ceramic output capacitor. Designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1811AT-028/TT datasheet, MCP1811AT-028/TT pinout, MCP1811AT-028/TT application, or MCP1811AT-028/TT equivalent, this page delivers verified electrical specs, package mapping to SOT-23-3, functional role in low-power sleep-mode regulation, and validated alternative options for ultra-low-IQ LDO selection.
Technical Context
The MCP1811AT-028/TT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV at 150 mA) and near-zero quiescent current during active regulation. Its integrated discharge transistor (RDCH = 100 Ω) actively pulls VOUT to GND when SHDN is asserted, eliminating residual output voltage during shutdown.
It features internal overcurrent protection with foldback limiting (50 mA at RLOAD = 1 Ω), ±25 mV load regulation across 1–150 mA, and PSRR of –50 dB at 1 kHz with no input capacitor - optimized for noise-sensitive, intermittently powered applications where supply rail integrity must be preserved during microamp-level sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures stable biasing for 2.8 V logic rails and analog sensors without external feedback. |
| Max Output Current | 150 mA - sufficient to power ultra-low-power MCUs, BLE radios, and sensor front-ends in intermittent operation. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices drawing <1 µA average current during deep-sleep cycles. |
| Shutdown Current | 10 nA typical - reduces system standby loss to negligible levels when paired with microcontroller-controlled SHDN. |
| Dropout Voltage | 400 mV at 150 mA - allows operation down to ~3.2 V input while maintaining regulated 2.8 V output. |
| Stability | 1.0 µF ceramic COUT - eliminates need for bulky tantalum or aluminum electrolytics, reducing BOM cost and PCB area. |
| Operating Temp | –40°C to +85°C - qualified for industrial and medical wearable environments with thermal cycling. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body height, exposed pad not present.
| 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 ground current only; tie directly to output capacitor ground for optimal PSRR. |
| 3 (VOUT) | Regulated output | Delivers fixed 2.8 V ±4%; requires ≥1.0 µF X7R ceramic capacitor for stability and low-noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical - extends shelf life and operational runtime in coin-cell–powered devices beyond 10 years. |
| Active output discharge | Integrated 100 Ω discharge switch - prevents back-powering of upstream circuitry and ensures clean power-down sequencing. |
| Ceramic-capacitor stability | 1.0 µF minimum COUT - enables compact, high-reliability designs without ESR constraints or aging concerns of electrolytic caps. |
| Wide input range | 1.8 V to 5.5 V - supports direct connection to single Li-ion, two alkaline, or energy-harvesting storage cells. |
| Overcurrent foldback | 50 mA short-circuit limit - protects both regulator and load during fault conditions without thermal runaway. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
|
Use Scenario: Indoor light or thermal energy harvester powers a wireless sensor node with intermittent RF transmission. IC Role / Device Role / Timing Role: Primary power regulator supplying 2.8 V to an ultra-low-power MCU and sub-GHz transceiver during burst transmit windows. Use Value: 250 nA quiescent current minimizes drain on micro-watt harvesters; 1.0 µF ceramic stability enables miniaturized PCB layout. |
Use Scenario: Rechargeable zinc-air battery powers a Class-D audio amplifier and DSP in a hearing aid worn 16+ hours/day. IC Role / Device Role / Timing Role: Main LDO delivering clean 2.8 V to analog front-end and digital core, with fast startup (<400 µs) after wake-on-sound. Use Value: Output discharge clears residual voltage before sleep, preventing audible pop artifacts and ensuring repeatable boot behavior. |
| Smart Wearable Tracker | Industrial Wireless Sensor |
|
Use Scenario: Wrist-worn activity tracker using motion-triggered BLE beaconing every 5 minutes. IC Role / Device Role / Timing Role: Regulator for accelerometer, RTC, and BLE SoC during ultra-low-duty-cycle operation. Use Value: 10 nA shutdown current preserves battery capacity between motion events; 400 mV dropout enables full utilization of declining battery voltage. |
Use Scenario: Battery-operated temperature/humidity sensor deployed in remote HVAC ducts with 10-year service interval. IC Role / Device Role / Timing Role: Power management IC providing stable 2.8 V to precision ADC and LoRaWAN transceiver during periodic measurement bursts. Use Value: ±4% output tolerance and ±25 mV load regulation ensure consistent ADC reference accuracy across 1–150 mA load swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | Same 2.8 V output, but 1.6 µA IQ (6.4× higher), no output discharge, 250 mA output capability. | Better suited for higher-load, lower-efficiency applications where 10-year battery life is not required. | Select when peak current >150 mA is needed and shutdown IQ <100 nA is not critical. |
| TN0128028R | 2.8 V, 250 nA IQ, no discharge, 100 mA output, SC70-3 package (smaller footprint but higher θJA). | Preferred for space-constrained designs where thermal dissipation is managed externally and discharge is unnecessary. | Choose for minimal PCB area in low-thermal-load applications where output discharge is omitted by system architecture. |
Compared with MCP1700T-2802E/TT and TN0128028R, the MCP1811AT-028/TT uniquely combines 250 nA IQ, 150 mA output, and active VOUT discharge in SOT-23-3 - making it the only option for systems requiring guaranteed zero-output-voltage shutdown and decade-scale battery life under microamp average loads.
Availability
MCP1811AT-028/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable trackers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1811AT-028/TT 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 microcontrollers, analog components, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1811A/B series was designed specifically for ultra-low-power, battery-constrained applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated power-management features like output discharge.
FAQ
What is the maximum input voltage rating for the MCP1811AT-028/TT?
The MCP1811AT-028/TT has an absolute maximum input voltage rating of +6.0 V. However, its specified operating input range is 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. Always maintain VIN ≤5.5 V in normal operation.
Does the MCP1811AT-028/TT require an input capacitor?
The MCP1811AT-028/TT does not require an input capacitor for stability, as confirmed in the datasheet AC/DC characteristics table. However, a 1 µF ceramic capacitor placed close to the VIN pin is strongly recommended to suppress high-frequency noise and transient spikes from the source, especially in noisy or shared-rail environments.
Is the MCP1811AT-028/TT pin-compatible with other variants in the MCP1811X family?
Yes - the MCP1811AT-028/TT uses the standard 3-lead SOT-23 package with identical pinout (VIN, GND, VOUT) as all other MCP1811A/B 3-lead variants. Voltage variants (e.g., MCP1811AT-330/TT) are drop-in replacements electrically and mechanically, provided the output voltage matches system requirements.
How does the output discharge function work in the MCP1811AT-028/TT?
In the MCP1811AT-028/TT (an MCP1811A variant), asserting SHDN = GND activates an internal 100 Ω NMOS discharge switch between VOUT and GND. This rapidly discharges the output capacitor, bringing VOUT to near-zero volts within microseconds - preventing back-powering, latch-up, or undefined logic states in downstream circuitry during power-down.
What is the thermal resistance (θJA) of the MCP1811AT-028/TT in its SOT-23-3 package?
The MCP1811AT-028/TT in the 3-lead SOT-23 package 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. This value assumes standard PCB layout practices; adding thermal vias or copper pour can significantly reduce effective θJA.
MCP1811AT-028/TT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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):
- 2.8V
- 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-23-3
MCP1811AT-028/TT FAQ
1.How can I place an order for MCP1811AT-028/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-028/TT 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-028/TT reliable?
The price and inventory of MCP1811AT-028/TT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811AT-028/TT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-028/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-028/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-028/TT?
MCP1811AT-028/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-028/TT 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-028/TT?
For technical support, including MCP1811AT-028/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-028/TT requirements.
6.How does Aetrix verify that MCP1811AT-028/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-028/TT 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-028/TT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-028/TT?
All MCP1811AT-028/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-028/TT, 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-028/TT part is unused and in its original packaging.
Return procedure for MCP1811AT-028/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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