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Microchip Technology MCP1811AT-025/LT
- Part No.:
- MCP1811AT-025/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811AT-025/LT.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
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Product details
Overview
MCP1811AT-025/LT from Microchip Technology is a 150 mA, ultra-low-quiescent-current (250 nA typical) fixed-output LDO linear regulator with 2.5 V output voltage, designed for energy-constrained battery-powered systems. It operates from 1.8 V to 5.5 V input, features output discharge during shutdown, and is stable with only 1.0 µF ceramic output capacitance - enabling compact, low-noise power delivery in wearable medical sensors and smart cards.
For engineers reviewing the MCP1811AT-025/LT datasheet, MCP1811AT-025/LT pinout, MCP1811AT-025/LT application, or MCP1811AT-025/LT equivalent, key selection criteria include its 250 nA operating IQ, 10 nA shutdown current, 400 mV dropout at 150 mA, output discharge capability, and compatibility with 3-lead SOT-23 packaging for space-constrained PCB layouts.
Technical Context
The MCP1811AT-025/LT implements a PMOS pass transistor architecture optimized for ultra-low static current, enabling multi-year operation on coin-cell batteries. Its internal error amplifier maintains ±4% output voltage accuracy across -40°C to +85°C junction temperature and load currents up to 150 mA.
It integrates an active discharge transistor (RDCH = 100 Ω typical) that pulls VOUT to GND when SHDN = GND, preventing residual voltage hold-up in sleep-mode systems. The device requires no external compensation and achieves stability with minimal 1.0 µF X7R ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±4% - tightly regulated rail for MCU cores or analog sensors requiring stable mid-range bias. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load applications (e.g., BLE beacon sleep cycles). |
| Shutdown Current | 10 nA typical - reduces standby drain to negligible levels during deep-sleep or storage modes. |
| Max Output Current | 150 mA - sufficient for intermittent RF transmission bursts or sensor acquisition without thermal derating. |
| Dropout Voltage | 400 mV @ 150 mA - allows operation down to VIN = 2.9 V while maintaining 2.5 V output, extending usable battery range. |
| Output Capacitance | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic caps, reducing board area and cost. |
| PSRR | -50 dB @ 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), surface-mount, RoHS-compliant, thermal pad not included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin for PSRR and stability. |
| VOUT | Regulated output | Delivers 2.5 V ±4%; connects directly to load and output capacitor; sensitive to trace inductance. |
| GND | Ground reference | Low-impedance return path for ground current only; tie to quiet ground plane or output cap cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical ensures <1 µA system sleep current when paired with XLP MCUs - critical for ISO 13849 PL-e safety-critical wearables. |
| Output discharge | Active pull-down (RDCH = 100 Ω) discharges VOUT within microseconds of SHDN assertion - prevents unintended wake-up or latch-up in stacked-battery systems. |
| Ceramic-cap stable | Stable with 1.0 µF X7R ceramic output cap - avoids ESR dependency, improves transient response, and eliminates aging drift vs. tantalum. |
| Wide input range | 1.8–5.5 V operation supports single-cell Li-ion (3.0–4.2 V), alkaline (1.8–3.2 V), or dual-cell NiMH (2.4–3.0 V) sources without redesign. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) limits power dissipation during short-circuit - protects die and PCB traces without external fusing. |
Applications
| Energy Harvesting Sensor Node | Smart Card with Secure Element |
|---|---|
|
Use Scenario: Indoor light-harvesting node powering a sub-GHz transceiver and MEMS accelerometer using a 3.3 V supercapacitor charged via photodiode. IC Role / Device Role / Timing Role: Primary 2.5 V LDO delivering regulated rail to transceiver during 100 ms TX burst; enters 10 nA shutdown between transmissions. Use Value: Enables >5-year maintenance-free operation by minimizing quiescent loss - 250 nA IQ consumes <0.22 mAh/year at 2.5 V. |
Use Scenario: Contactless payment card with embedded secure microcontroller requiring fast, clean 2.5 V supply during NFC field activation. IC Role / Device Role / Timing Role: Low-noise 2.5 V regulator supplying crypto engine and RF front-end; output discharge clears residual charge before next field coupling. Use Value: Prevents data corruption during rapid field-on/off transitions - RDCH discharges VOUT in <10 µs, meeting EMVCo timing requirements. |
| Hearing Aid Front-End | Medical Patch Monitor |
|
Use Scenario: Rechargeable hearing aid with analog microphone preamp, ADC, and Bluetooth LE SoC powered from 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: 2.5 V LDO supplies analog signal chain; operates continuously at 250 nA IQ during acoustic processing and sleep. Use Value: Extends battery runtime by 30% vs. standard LDOs - 250 nA IQ reduces annual drain to <2.2 mAh, enabling 7-day use per charge. |
Use Scenario: Disposable ECG patch with 10-day wear life, using CR2032 coin cell and ultra-low-power analog front-end. IC Role / Device Role / Timing Role: Primary 2.5 V regulator for op-amps and SAR ADC; shuts down during 99% of ECG sampling cycle to conserve energy. Use Value: Achieves 10-day operation on 220 mAh CR2032 - 10 nA shutdown current contributes <0.009 mAh total drain over full lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B252MR-G | 250 nA IQ, 150 mA, 2.5 V, but no output discharge; 3-lead SOT-23 package. | Lacks active VOUT discharge - unsuitable where residual voltage must be cleared during shutdown. | Select if output discharge is unnecessary and lowest possible BOM cost is prioritized. |
| Ricoh RP114K251D-TR-F | 250 nA IQ, 200 mA, 2.5 V, includes output discharge; 4-lead SOT-23 package (SHDN, VIN, VOUT, GND). | Higher output current (200 mA) and different pinout - requires PCB layout change and additional SHDN routing. | Select if higher load headroom is needed and board revision is acceptable. |
Compared with XC6210B252MR-G and RP114K251D-TR-F, the MCP1811AT-025/LT uniquely combines 150 mA capability, 10 nA shutdown, output discharge, and 3-pin SOT-23 simplicity - making it optimal for space- and energy-constrained designs where pin count and discharge behavior are non-negotiable.
Availability
MCP1811AT-025/LT is available at Aetrix Electronics and suitable for energy harvesting sensor nodes, smart card secure elements, and disposable medical patches requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811AT-025/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 microcontrollers, analog components, and Flash-IP solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The MCP1811A/B series was designed specifically for ultra-low-power, long-life battery applications - emphasizing nanoscale quiescent current, ceramic-cap stability, and integrated discharge functionality for next-generation wearables and IoT edge devices.
FAQ
What is the maximum input voltage rating for the MCP1811AT-025/LT?
The MCP1811AT-025/LT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V violates the recommended operating conditions and may cause permanent damage. For reliable performance, maintain VIN between 1.8 V and 5.5 V, with minimum VIN ≥ 2.9 V to sustain 2.5 V output at 150 mA load due to its 400 mV dropout specification.
Does the MCP1811AT-025/LT require an external shutdown resistor?
No, the MCP1811AT-025/LT does not require an external pull-up resistor on the SHDN pin. Its internal logic accepts direct connection to VIN or a digital GPIO. When SHDN is pulled to GND, the device enters shutdown mode drawing only 10 nA typical; when left open or tied to VIN (>1.4 V), it remains enabled. External resistors are unnecessary unless level-shifting is required.
Can the MCP1811AT-025/LT be used with a 0.47 µF output capacitor?
No - the MCP1811AT-025/LT requires a minimum of 1.0 µF ceramic (X7R) output capacitance for guaranteed stability across all operating conditions. Using 0.47 µF risks oscillation, poor load transient response, and potential output voltage overshoot. Microchip's datasheet specifies 1.0 µF as the absolute minimum; 2.2 µF is recommended for improved PSRR and margin.
How does the output discharge function behave during startup?
The output discharge transistor in the MCP1811AT-025/LT is inactive during normal startup. It only engages when SHDN is driven low (≤20% VIN). During power-on (SHDN high), VOUT ramps up normally with ~400 µs delay and ~200–1000 µs rise time. Discharge occurs exclusively in shutdown mode, pulling VOUT to GND within microseconds after SHDN assertion - ensuring safe reset sequencing in multi-rail systems.
Is the MCP1811AT-025/LT compatible with lead-free reflow soldering profiles?
Yes, the MCP1811AT-025/LT in SOT-23 package is rated for standard lead-free reflow per JEDEC J-STD-020 Rev E. Its peak reflow temperature tolerance is 260°C for 30 seconds maximum, with ramp rates and soak profiles compliant with IPC/JEDEC standards. The device is RoHS-compliant and halogen-free, supporting environmentally aligned manufacturing.
MCP1811AT-025/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):
- 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-70-5
MCP1811AT-025/LT FAQ
1.How can I place an order for MCP1811AT-025/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-025/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-025/LT reliable?
The price and inventory of MCP1811AT-025/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-025/LT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-025/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-025/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-025/LT?
MCP1811AT-025/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-025/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-025/LT?
For technical support, including MCP1811AT-025/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-025/LT requirements.
6.How does Aetrix verify that MCP1811AT-025/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-025/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-025/LT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-025/LT?
All MCP1811AT-025/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-025/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-025/LT part is unused and in its original packaging.
Return procedure for MCP1811AT-025/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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