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Microchip Technology MCP1811AT-025/LB
- Part No.:
- MCP1811AT-025/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811AT-025/LB.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,193
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Product details
Overview
MCP1811AT-025/LB 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/LB datasheet, MCP1811AT-025/LB pinout, MCP1811AT-025/LB application, or MCP1811AT-025/LB equivalent, this page delivers verified electrical specs, package mapping to 3-lead SOT-23, thermal resistance data (θJA = 211.33°C/W), shutdown leakage (10 nA typ), and stable operation with 1 µF ceramic output capacitor.
Technical Context
The MCP1811AT-025/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV max at 150 mA) and high PSRR (–50 dB at 1 kHz). Its internal error amplifier and reference circuit maintain ±4% output accuracy over –40°C to +85°C junction temperature.
It integrates a dedicated discharge transistor (RDCH = 100 Ω) activated during shutdown (SHDN = GND), ensuring rapid VOUT decay to prevent back-powering of downstream circuitry-a critical feature in multi-rail power sequencing for ultra-low-power microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% - ensures stable supply for 2.5 V logic, ADC references, or sensor biasing without external feedback. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices drawing <1 µA average current. |
| Shutdown Current | 10 nA typical - reduces system standby power to near-zero when paired with XLP microcontrollers. |
| Max Output Current | 150 mA - supports moderate-current peripherals (e.g., BLE radios, OLED drivers) while maintaining ultra-low IQ. |
| Dropout Voltage | 400 mV max at 150 mA - allows regulation from 2.9 V input down to end-of-life battery voltages (e.g., 2.5 V Li-SOCl₂). |
| Stability | Stable with 1.0 µF ceramic COUT - eliminates need for bulky tantalum capacitors, reducing PCB area and cost. |
| PSRR | –50 dB at 1 kHz - suppresses switching noise from DC/DC converters feeding the LDO input rail. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), footprint-compatible with SC70 but with higher thermal performance (θJA = 211.33°C/W on 4-layer FR4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor to minimize input ripple and ensure stability. |
| VOUT | Regulated output | Delivers fixed 2.5 V; must connect ≥1.0 µF ceramic capacitor directly between VOUT and GND for loop stability. |
| GND | Ground reference | Low-impedance return path for ground current only; tie to quiet ground plane or output capacitor return to optimize PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Output discharge on shutdown | Active discharge via integrated 100 Ω transistor ensures VOUT drops to GND within microseconds-prevents latch-up in stacked power domains. |
| Ultra-low shutdown leakage | 10 nA typical SHDN current enables reliable deep-sleep wake-up timing without parasitic discharge of retention capacitors. |
| Ceramic capacitor compatibility | Stable with 1 µF X7R ceramic output cap-reduces BOM count, eliminates ESR-related instability, and cuts solution size by >50% vs. tantalum. |
| Wide input voltage range | 1.8–5.5 V operation supports single-cell Li-ion, Li-SOCl₂, alkaline, and USB-supplied systems without input pre-regulation. |
| Overcurrent protection | Foldback current limit (50 mA) and 250 mA trip threshold protect against short-circuit faults while minimizing thermal stress during sustained overload. |
Applications
| Energy Harvesting Systems | Long-Life Medical Devices |
|---|---|
Use Scenario: Powering wireless sensor nodes powered by thermoelectric or piezoelectric harvesters delivering intermittent µW-level energy. IC Role / Device Role / Timing Role: Primary voltage regulator converting harvested energy into stable 2.5 V supply for ultra-low-power MCU and RF transceiver. Use Value: 250 nA quiescent current minimizes no-load drain, enabling operation even when harvester output falls below 1 µA average. | Use Scenario: Hearing aids requiring decade-long operation from zinc-air batteries with strict leakage limits. IC Role / Device Role / Timing Role: Main power regulator supplying 2.5 V to analog front-end and DSP core during active and sleep modes. Use Value: 10 nA shutdown current prevents battery depletion during device storage or user-off periods. |
| Smart Wearables | Ultra-Low-Power IoT Endpoints |
Use Scenario: Smart wristbands using CR2032 coin cells to power motion sensors, BLE radio, and display driver. IC Role / Device Role / Timing Role: System LDO providing clean 2.5 V rail for mixed-signal SoC with dynamic voltage scaling. Use Value: Output discharge ensures fast reset and eliminates residual voltage that could cause firmware corruption on cold start. | Use Scenario: Wireless environmental monitors deployed in remote locations with infrequent maintenance. IC Role / Device Role / Timing Role: Always-on regulator powering real-time clock, sensor interface, and wake-up controller in sub-µA sleep mode. Use Value: Stable 1 µF ceramic output capacitance enables compact, high-reliability design without electrolytic capacitor aging concerns. |
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/MB | 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 rapid rail collapse is required for safe power sequencing. | Select when output discharge is unnecessary and lowest possible BOM cost is prioritized. |
| Torex XC6206P252MR-G | 2.5 V, 1 µA IQ (10× higher), 150 mA, no discharge, SOT-23-3; lower PSRR (–45 dB @ 1 kHz). | Higher quiescent current reduces battery life in µA-average systems; no discharge function. | Choose only if Microchip supply chain constraints exist and 1 µA IQ meets system lifetime targets. |
Compared with MCP1700T-2502E/MB and XC6206P252MR-G, the MCP1811AT-025/LB uniquely delivers both ultra-low 250 nA IQ and integrated output discharge in the same SOT-23-3 footprint-enabling robust power sequencing in space-constrained, multi-rail ultra-low-power designs without layout changes.
Availability
MCP1811AT-025/LB is available at Aetrix Electronics and suitable for energy harvesting systems, medical wearables, and ultra-low-power IoT endpoints requiring stable component supply across multi-year production cycles.
Supply support for MCP1811AT-025/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 is a leading provider of microcontroller, analog, and FPGA solutions, with a strong focus on low-power and embedded control applications.
The MCP1811A/B series was designed specifically for ultra-long-life battery-powered systems demanding nanoscale quiescent current, output discharge, and ceramic-capacitor stability-targeting hearing aids, smart cards, and energy-harvesting nodes.
FAQ
What is the maximum input voltage rating for the MCP1811AT-025/LB?
The MCP1811AT-025/LB has an absolute maximum input voltage rating of +6.0 V. Operation beyond this voltage risks permanent damage. For reliable continuous operation, the input voltage must remain within the specified 1.8 V to 5.5 V range, with minimum VIN dependent on load current and dropout requirements.
Does the MCP1811AT-025/LB require an external resistor divider to set output voltage?
No, the MCP1811AT-025/LB is a fixed-output LDO with factory-trimmed 2.5 V regulation. It does not support adjustable output via external resistors. The "025" in the part number explicitly denotes the 2.5 V version, eliminating need for feedback network design or trimming.
How does the output discharge function operate in the MCP1811AT-025/LB?
The MCP1811AT-025/LB activates its internal discharge transistor (RDCH = 100 Ω typical) when SHDN is pulled low. This provides a controlled discharge path from VOUT to GND, collapsing the output voltage rapidly-critical for preventing back-powering or unintended wake-up in systems with multiple power domains.
Can the MCP1811AT-025/LB be used with a 1 µF ceramic capacitor on the output?
Yes, the MCP1811AT-025/LB is explicitly characterized and guaranteed stable with a minimum 1.0 µF X7R ceramic output capacitor. This eliminates ESR dependency and simplifies design versus older LDOs requiring tantalum or aluminum electrolytic capacitors.
What is the thermal resistance (θJA) of the MCP1811AT-025/LB in its SOT-23 package?
The MCP1811AT-025/LB in the 3-lead SOT-23 package has a thermal resistance θJA of 211.33°C/W when mounted 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 improve thermal performance.
MCP1811AT-025/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):
- 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:
- SC-70-3
MCP1811AT-025/LB FAQ
1.How can I place an order for MCP1811AT-025/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-025/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-025/LB reliable?
The price and inventory of MCP1811AT-025/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-025/LB is usually 5 days.
3.What payment methods are accepted for MCP1811AT-025/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-025/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-025/LB?
MCP1811AT-025/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-025/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-025/LB?
For technical support, including MCP1811AT-025/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-025/LB requirements.
6.How does Aetrix verify that MCP1811AT-025/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-025/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-025/LB meets industry standards.
7.What is the process for return or replacement of MCP1811AT-025/LB?
All MCP1811AT-025/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-025/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-025/LB part is unused and in its original packaging.
Return procedure for MCP1811AT-025/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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