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Microchip Technology MCP1811AT-030/TT
- Part No.:
- MCP1811AT-030/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811AT-030/TT.pdf
- Description:
- IC REG LINEAR 3V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,433
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Product details
Overview
MCP1811AT-030/TT from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO regulator with fixed 3.0 V output, 250 nA typical IQ, 1.8–5.5 V input range, and output discharge during shutdown. It operates in -40°C to +85°C and targets energy-constrained systems such as wearable medical sensors and battery-powered IoT edge nodes.
For engineers reviewing the MCP1811AT-030/TT datasheet, MCP1811AT-030/TT pinout, MCP1811AT-030/TT application, or MCP1811AT-030/TT equivalent, this page delivers verified electrical specs, package mapping, thermal performance data, real-world use cases, and validated alternative parts - all grounded in Microchip's DS20006088C specification.
Technical Context
The MCP1811AT-030/TT implements a low-dropout linear regulation architecture optimized for ultra-low-power operation, featuring an internal error amplifier, current-limit protection, and a dedicated discharge transistor (DT) active when SHDN = GND. Its stability is guaranteed with ≥1.0 µF ceramic output capacitance.
This variant belongs to the MCP1811A subfamily (A-suffix denotes output discharge capability), supports 5-Lead SOT-23 packaging, and maintains ±4% output voltage accuracy across load (0–150 mA), temperature (-40°C to +85°C), and line (VIN = VR + 1V to 5.5V) variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±4% - ensures stable supply for 3.3 V-tolerant microcontrollers and sensors without external feedback. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-mode applications like smart tags and hearing aids. |
| Shutdown Current | 10 nA typical - reduces system standby power to near-zero when disabled via SHDN pin. |
| Max Output Current | 150 mA - sufficient for powering BLE SoCs, low-power ADCs, and RF transceivers in compact wearables. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and USB-supplied designs. |
| Dropout Voltage | 600 mV max at 150 mA - allows regulation down to VIN = 3.6 V while delivering full 3.0 V output. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - minimizes board area and cost vs. tantalum; enables low-noise, fast transient response. |
Pinout & Package
Package: 5-Lead SOT-23 (SC-74A), moisture sensitivity level (MSL) 1, RoHS-compliant, 1.6 mm × 2.9 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic decoupling capacitor close to pin. |
| 2: SHDN | Active-low enable/disable control | Pull low to disable regulator and activate output discharge; logic high >70% VIN enables operation. |
| 3: NC | No connect | Internally unconnected; must be left floating or tied to GND per layout best practice. |
| 4: VOUT | Regulated 3.0 V output | Delivers up to 150 mA; requires ≥1.0 µF X7R ceramic capacitor to ground for stability. |
| 5: GND | Power ground reference | Low-impedance return path for load and quiescent current; tie directly to output capacitor ground. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in devices drawing <1 µA average current during deep sleep cycles. |
| Output discharge on shutdown | Drains VOUT to GND via internal 100 Ω transistor, preventing residual voltage hold-up in safety-critical or reset-sensitive systems. |
| Ceramic-capacitor stability | Eliminates need for ESR-tuned tantalum capacitors, reducing BOM count, cost, and PCB area by >30% vs. legacy LDOs. |
| Overcurrent foldback protection | Limits short-circuit current to ~50 mA, protecting both IC and source in fault conditions without thermal shutdown delay. |
| PSRR of -50 dB @ 1 kHz | Rejects ripple from noisy switching supplies, enabling clean analog sensor or RF front-end power without additional filtering. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition using ultra-low-power MCU and analog front-end, powered by coin cell. IC Role / Device Role / Timing Role: Primary 3.0 V power rail regulator with shutdown-controlled wake-up sequencing. Use Value: 250 nA quiescent current extends CR2032 battery life beyond 5 years in 99% sleep duty cycle. |
Use Scenario: Indoor light-harvesting node transmitting temperature/humidity every 5 minutes via BLE. IC Role / Device Role / Timing Role: Stable 3.0 V supply for energy buffer management and radio burst transmission. Use Value: 1.8 V minimum input enables operation down to single-cell NiMH or amorphous silicon PV output. |
| Smart Card Reader Module | Hearing Aid Signal Chain |
|
Use Scenario: Contactless payment terminal with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: Low-noise 3.0 V supply for cryptographic IC and RF analog circuitry. Use Value: -50 dB PSRR suppresses switching noise from host processor, ensuring secure element certification compliance. |
Use Scenario: Miniature in-the-ear hearing aid with digital signal processor and MEMS microphone. IC Role / Device Role / Timing Role: Primary bias supply for DSP core and audio ADC/DAC stages. Use Value: Output discharge clears residual charge before power cycling, eliminating audible pop artifacts during startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-3002E/TT | Same 3.0 V output, same 150 mA rating, but A-suffix indicates identical output discharge function and 5-Lead SOT-23 package. | No functional difference; differs only in tape-and-reel packaging (E/TT vs. /TT) and minor traceability coding. | Select when requiring Microchip's standard EIA-481-2 compliant reel format for automated assembly. |
| Torex XC6206P302MR-G | 3.0 V fixed output, 150 mA, 1 µF ceramic stable, but no output discharge; 250 nA IQ; 3-Lead SOT-23 package. | Lacks discharge transistor - unsuitable where VOUT must be actively pulled low during shutdown. | Choose only if board-level discharge circuitry exists or discharge is not required; smaller 3-pin footprint saves space. |
Compared with MCP1811AT-030/TT, the MCP1811AT-3002E/TT offers identical electrical and thermal behavior with packaging variation, while the XC6206P302MR-G trades discharge capability for reduced pin count and marginally higher dropout - making it viable only in non-discharge-critical, space-constrained designs.
Availability
MCP1811AT-030/TT is available at Aetrix Electronics and suitable for energy harvesting, wearable electronics, and long-life battery-powered applications requiring stable component supply, consistent parametric performance, and full lifecycle traceability.
Supply support for MCP1811AT-030/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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1811A family was designed specifically for ultra-low-power, long-duration portable and energy-harvesting applications - prioritizing nanoscale quiescent current, minimal external components, and robust operation across wide temperature and input voltage ranges.
FAQ
What is the maximum continuous output current of the MCP1811AT-030/TT?
The MCP1811AT-030/TT delivers up to 150 mA continuously under specified thermal conditions (TA ≤ +85°C, JEDEC 4-layer board). At higher ambient temperatures or with limited PCB copper, derating applies - e.g., ~120 mA at TA = +70°C with 2-layer board. The device includes foldback current limiting that reduces output to ~50 mA during short-circuit events.
Does the MCP1811AT-030/TT require an external resistor divider for output voltage setting?
No. The MCP1811AT-030/TT is a fixed-output LDO with factory-trimmed 3.0 V regulation - no external resistors are needed. Its internal feedback network is laser-trimmed to maintain ±4% accuracy over temperature, line, and load. This eliminates design complexity and improves long-term stability versus adjustable regulators.
How does the output discharge feature work in the MCP1811AT-030/TT?
When the SHDN pin is driven low, the MCP1811AT-030/TT disables regulation and activates an internal 100 Ω NMOS discharge transistor between VOUT and GND. This safely discharges the output capacitor within microseconds, preventing residual voltage from interfering with downstream reset timing or causing latch-up in connected logic. Discharge is automatic and requires no external components.
Can the MCP1811AT-030/TT operate with a 1.5 V input supply?
No. The MCP1811AT-030/TT has a minimum input voltage of 1.8 V per its absolute specifications. At 1.5 V input, the device will not regulate - VOUT collapses to approximately VIN minus dropout (~1.5 V – 0.6 V = 0.9 V), and internal circuitry may become nonfunctional. For sub-1.8 V sources, consider energy harvesting PMICs or boost-then-regulate architectures.
What is the thermal resistance (θJA) of the MCP1811AT-030/TT in its 5-Lead SOT-23 package?
The MCP1811AT-030/TT in 5-Lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) of 184.82°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias. In real-world 2-layer layouts without thermal relief, θJA may exceed 250°C/W - requiring careful power dissipation calculation: PD = (VIN – VOUT) × IOUT must stay below (TJ(MAX) – TA)/θJA to avoid thermal shutdown.
MCP1811AT-030/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):
- 3V
- 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-030/TT FAQ
1.How can I place an order for MCP1811AT-030/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-030/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-030/TT reliable?
The price and inventory of MCP1811AT-030/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-030/TT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-030/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-030/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-030/TT?
MCP1811AT-030/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-030/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-030/TT?
For technical support, including MCP1811AT-030/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-030/TT requirements.
6.How does Aetrix verify that MCP1811AT-030/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-030/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-030/TT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-030/TT?
All MCP1811AT-030/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-030/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-030/TT part is unused and in its original packaging.
Return procedure for MCP1811AT-030/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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