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Microchip Technology MCP1811AT-025/TT
- Part No.:
- MCP1811AT-025/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811AT-025/TT.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,210
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Product details
Overview
MCP1811AT-025/TT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 2.5 V output, 1.8–5.5 V input range, and output discharge functionality-designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1811AT-025/TT datasheet, MCP1811AT-025/TT pinout, MCP1811AT-025/TT application, or MCP1811AT-025/TT equivalent, this page delivers verified technical context, package mapping to SOT-23-3, key LDO specifications including dropout voltage (400 mV @ 150 mA), shutdown current (10 nA typical), and ceramic capacitor stability (1 µF), enabling rapid low-power system integration.
Technical Context
The MCP1811AT-025/TT implements a PMOS pass transistor architecture enabling ultra-low IQ operation while maintaining regulation across 1.8–5.5 V input and delivering up to 150 mA at 2.5 V. Its integrated discharge transistor (RDCH = 100 Ω) actively pulls VOUT to GND during shutdown (SHDN = GND), preventing residual voltage hold-up in sleep-critical systems.
It operates over –40°C to +85°C junction temperature and achieves stable regulation with only 1 µF X7R ceramic output capacitance-eliminating need for bulk electrolytic capacitors. The device includes overcurrent protection and foldback current limiting (50 mA at RLOAD = 1 Ω), ensuring robustness under fault conditions without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% - ensures precise biasing for 2.5 V logic, ADC references, and sensor interfaces without external feedback. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices drawing microampere-level average current (e.g., coin-cell-powered IoT nodes). |
| Max Output Current | 150 mA - supports moderate-power peripherals like BLE radios, microcontrollers in active mode, or small displays. |
| Dropout Voltage | 400 mV typical @ 150 mA - allows operation down to VIN = 2.9 V while sustaining 2.5 V output, maximizing usable battery voltage range. |
| Shutdown Current | 10 nA typical - reduces system standby power to near-zero, critical for energy-harvesting applications with intermittent source availability. |
| Output Capacitor | 1 µF ceramic (X7R) - enables compact, low-ESR, low-noise filtering; eliminates need for larger, less reliable tantalum or aluminum electrolytics. |
| PSRR | –50 dB @ 1 kHz - suppresses ripple from noisy switching supplies or shared rails, preserving signal integrity in mixed-signal circuits. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA). Compact 2.92 mm × 2.37 mm × 1.12 mm footprint with exposed pad not present in this variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 1.8–5.5 V unregulated input; must be decoupled with ≥0.1 µF ceramic capacitor close to pin. |
| 2 (GND) | Ground reference | Low-impedance return path for load and regulator ground current; tie directly to quiet ground plane or output capacitor cathode. |
| 3 (VOUT) | Regulated output | Delivers stable 2.5 V; requires ≥1 µF X7R ceramic capacitor between VOUT and GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year operation on CR2032 coin cell in duty-cycled systems (e.g., wake-on-event sensors). |
| Output discharge (DT) | Active pull-down of VOUT during SHDN asserts clean power-down state-prevents unintended wake-up or leakage paths. |
| Ceramic-capacitor stable | Eliminates ESR requirements and aging concerns of electrolytics; reduces BOM count and board area by >50% vs. legacy LDOs. |
| Overcurrent foldback | Limits short-circuit current to 50 mA, protecting both regulator and source in fault conditions without thermal shutdown delay. |
| Wide input range (1.8–5.5 V) | Supports single-cell Li-ion (3.0–4.2 V), alkaline (1.8–3.0 V), and USB-powered (5 V) designs with one BOM item. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
Use Scenario: Indoor light or thermal gradient harvester powering a sub-10 µA MCU and BLE transmitter. IC Role / Device Role: Primary power regulator converting microwatt-level harvested energy into stable 2.5 V rail. Use Value: 250 nA IQ minimizes drain below harvest threshold; 1 µF ceramic compatibility enables ultra-small form factor. |
Use Scenario: Miniature in-the-ear hearing aid using zinc-air battery with 3–6 month operational life. IC Role / Device Role: Main supply regulator for DSP, microphone preamp, and receiver amplifier. Use Value: 10 nA shutdown current extends shelf life; 400 mV dropout preserves battery runtime down to 2.9 V. |
| Smart Wearable Sensor | Industrial Wireless Sensor |
Use Scenario: Wrist-worn health monitor sampling ECG/PPG every 5 seconds, transmitting data hourly via BLE. IC Role / Device Role: Low-noise analog supply for precision front-end and digital core regulator. Use Value: –50 dB PSRR at 1 kHz rejects switching noise from BLE RF section; 2.5 V output matches SAR ADC reference. |
Use Scenario: Battery-powered vibration sensor node in predictive maintenance system deployed for 5+ years. IC Role / Device Role: Power management IC for ultra-low-duty-cycle microcontroller and MEMS accelerometer. Use Value: 150 mA capability supports brief high-current wireless transmission bursts; wide VIN accommodates aging battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/TT | Same 2.5 V output, 250 nA IQ, but no output discharge; 150 mA rating; SOT-23-3 package. | Lacks active VOUT discharge-unsuitable where residual voltage must be cleared during deep sleep. | Select when output discharge is unnecessary and lowest possible cost is prioritized. |
| TN0125A-2.5TR | 2.5 V, 300 nA IQ, 150 mA, no discharge; SC70-3 package; higher dropout (500 mV @ 150 mA). | Higher dropout and no discharge limit use in low-VIN or fast-power-down systems. | Consider only if SC70-3 footprint is required and 2.9 V minimum VIN is acceptable. |
Compared with MCP1700T-2502E/TT and TN0125A-2.5TR, the MCP1811AT-025/TT uniquely combines 250 nA IQ, 10 nA shutdown, and active output discharge in SOT-23-3-making it the sole choice for energy-constrained systems requiring guaranteed VOUT collapse during sleep.
Availability
MCP1811AT-025/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable sensors requiring stable component supply with long-term lifecycle assurance.
Supply support for MCP1811AT-025/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 is a leading provider of microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1811A/B series was designed specifically for ultra-low-power, battery- and energy-harvesting–powered applications-emphasizing nanoscale quiescent current, minimal external components, and robust operation across wide temperature and input ranges.
FAQ
What is the maximum input voltage rating for the MCP1811AT-025/TT?
The MCP1811AT-025/TT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V is not recommended per datasheet specifications, as electrical characteristics are only guaranteed within the 1.8–5.5 V operating range. Exceeding 6.0 V risks permanent damage.
Does the MCP1811AT-025/TT require an external shutdown control signal?
No-the MCP1811AT-025/TT does not include a dedicated SHDN pin. It is the non-shutdown variant of the MCP1811A family (denoted by "T" suffix), meaning it operates continuously when powered. For shutdown capability, select MCP1811A-250/TT (5-pin SOT-23) instead.
Can the MCP1811AT-025/TT be used with a 1 µF ceramic output capacitor?
Yes-the MCP1811AT-025/TT is explicitly characterized and stabilized with a minimum 1 µF X7R ceramic capacitor on VOUT. This value ensures phase margin >45°, adequate transient response, and low output noise-no additional compensation or ESR requirements apply.
What is the thermal resistance (θJA) of the MCP1811AT-025/TT in its SOT-23-3 package?
The MCP1811AT-025/TT 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. This value assumes standard layout practices; adding thermal vias or copper pour can reduce effective θJA by up to 30%.
Is the MCP1811AT-025/TT RoHS-compliant and lead-free?
Yes-the MCP1811AT-025/TT is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU and Microchip's green packaging standards. The "/TT" suffix denotes tape-and-reel packaging with Pb-free matte tin finish on all terminals.
MCP1811AT-025/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):
- 2.5V
- 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-025/TT FAQ
1.How can I place an order for MCP1811AT-025/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-025/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-025/TT reliable?
The price and inventory of MCP1811AT-025/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-025/TT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-025/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-025/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-025/TT?
MCP1811AT-025/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-025/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-025/TT?
For technical support, including MCP1811AT-025/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-025/TT requirements.
6.How does Aetrix verify that MCP1811AT-025/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-025/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-025/TT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-025/TT?
All MCP1811AT-025/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-025/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-025/TT part is unused and in its original packaging.
Return procedure for MCP1811AT-025/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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