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Microchip Technology MCP1811AT-012/TT
- Part No.:
- MCP1811AT-012/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811AT-012/TT.pdf
- Description:
- IC REG LINEAR 1.2V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,573
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Product details
Overview
MCP1811AT-012/TT from Microchip Technology is a 150 mA ultra-low quiescent current (250 nA typical) fixed-output 1.2 V low-dropout linear regulator in a 3-lead SOT-23 package, featuring output discharge during shutdown and stable operation with only 1.0 µF ceramic output capacitance - designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1811AT-012/TT datasheet, MCP1811AT-012/TT pinout, MCP1811AT-012/TT application, or MCP1811AT-012/TT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options - all grounded in Microchip's DS20006088C specification and official package documentation.
Technical Context
The MCP1811AT-012/TT implements a CMOS-based LDO architecture with internal reference, error amplifier, and foldback current limiting. It operates across 1.8V–5.5V input range and maintains regulation down to 400 mV dropout at 150 mA load, enabling use with single-cell Li-ion, NiMH, or coin-cell sources.
Its SHDN pin enables active-low logic control with 70% VIN high-threshold and 20% VIN low-threshold, while the integrated discharge transistor (RDCH = 100 Ω typical) actively pulls VOUT to GND during shutdown - a feature exclusive to MCP1811A/12A variants and confirmed for this part number.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for ultra-low-voltage MCUs and sensors without external feedback. |
| Max Output Current | 150 mA continuous - sufficient to power BLE SoCs, RF transceivers, or sensor nodes in active mode. |
| Quiescent Current | 250 nA typical - enables multi-year operation on 220 mAh coin cells in sleep-dominated duty cycles. |
| Shutdown Current | 10 nA typical - reduces standby drain to negligible levels, critical for maintenance-free IoT endpoints. |
| Dropout Voltage | 400 mV at 150 mA - allows regulation from 1.6 V input, supporting aging batteries or low-VIN energy harvesters. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, reducing BOM cost and footprint. |
| Operating Temp | –40°C to +85°C junction - qualified for industrial and medical wearable environments. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.6 mm × 1.1 mm body, gull-wing leads, Pb-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOUT) | Regulated output voltage | Delivers stable 1.2 V to load; requires local 1.0 µF ceramic capacitor to GND for stability and noise suppression. |
| 2 (GND) | Ground reference | Low-impedance return path for regulator ground current only; must connect directly to quiet ground plane near output capacitor. |
| 3 (VIN) | Input supply voltage | Accepts 1.8–5.5 V input; bypass with 1.0 µF ceramic capacitor recommended to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Extends battery life >10 years in 1% duty-cycle sensor nodes powered by CR2032 cells. |
| Output discharge (SHDN = GND) | Prevents residual voltage hold-up on VOUT, eliminating unintended wake-up of downstream circuitry. |
| Ceramic-capacitor stability | Enables compact, low-ESR, low-noise designs without compensation networks or ferrite beads. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events. |
| PSRR (–50 dB @ 1 kHz) | Rejects ripple from noisy switching supplies or shared rails, preserving analog sensor accuracy. |
Applications
| Energy Harvesting | Medical Wearables |
|---|---|
|
Use Scenario: Powering wireless environmental sensors from thermoelectric or piezoelectric harvesters delivering <50 µW average power. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable harvester output into stable 1.2 V for ultra-low-power MCU and RF transceiver. Use Value: 250 nA quiescent current minimizes no-load loss, maximizing usable energy from micro-watt sources. |
Use Scenario: Supplying hearing aid ASICs requiring precise 1.2 V rail with zero residual voltage during sleep mode. IC Role / Device Role / Timing Role: Main power regulator with active discharge ensuring complete system reset upon shutdown command. Use Value: 10 nA shutdown current extends battery life beyond 5 years in Class I medical devices. |
| Smart Cards | Long-Life IoT Sensors |
|
Use Scenario: Providing regulated power to contactless payment ICs during brief NFC field activation bursts. IC Role / Device Role / Timing Role: Fast-starting LDO (400 µs delay from SHDN) delivering clean 1.2 V within NFC timing constraints. Use Value: Stable output under dynamic load steps (100 µA ↔ 10 mA) ensures reliable cryptographic execution. |
Use Scenario: Powering LoRaWAN end-nodes deployed in remote infrastructure with 10+ year service life. IC Role / Device Role / Timing Role: Primary regulator for microcontroller, sensor, and sub-GHz transceiver in intermittent transmit/receive cycles. Use Value: 1.0 µF ceramic stability reduces PCB area by >60% vs. traditional LDOs, enabling miniaturized form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-1202E/TT | Same 1.2 V output, but in 5-lead SOT-23 with dedicated SHDN pin and NC terminal - adds flexibility for enable sequencing. | Required where independent enable control is needed alongside VIN/VOUT/GND; not pin-compatible with 3-lead SOT-23 layout. | Select when board design accommodates 5-pin footprint and explicit shutdown control is preferred over direct SHDN tie-down. |
| Torex XC6206P122MR-G | 1.2 V, 150 mA, 1 µF stable, but 1 µA typical IQ - 4× higher quiescent current than MCP1811AT-012/TT. | Suitable for cost-sensitive consumer wearables where 1-year battery life suffices; not viable for >5-year deployments. | Choose only if procurement constraints require Torex sourcing and 1 µA IQ meets system sleep budget. |
Compared with MCP1811AT-1202E/TT, the MCP1811AT-012/TT saves PCB area and simplifies routing with its 3-pin configuration, while versus XC6206P122MR-G, it delivers 4× lower IQ - making it the sole option for decade-long deployments in sealed medical or infrastructure sensors.
Availability
MCP1811AT-012/TT is available at Aetrix Electronics and suitable for energy harvesting systems, medical wearables, and long-life IoT sensors requiring stable component supply with guaranteed longevity and traceable sourcing.
Supply support for MCP1811AT-012/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 Flash-IP solutions, serving automotive, industrial, and consumer markets with vertically integrated silicon and software.
The MCP1811A/B series was engineered specifically for ultra-low-power applications demanding nanowatt-level quiescent operation, output discharge, and ceramic-capacitor compatibility - targeting battery-constrained edge devices.
FAQ
What is the maximum input voltage rating for the MCP1811AT-012/TT?
The MCP1811AT-012/TT has an absolute maximum input voltage of +6.0 V per Microchip DS20006088C. Its operational input range is 1.8 V to 5.5 V; applying >6.0 V risks permanent damage. For 5 V systems, ensure transient spikes remain below this threshold using appropriate clamping or filtering.
Does the MCP1811AT-012/TT include output discharge functionality?
Yes - the MCP1811AT-012/TT is an MCP1811A variant and includes an integrated discharge transistor (RDCH = 100 Ω typical) that actively pulls VOUT to GND when SHDN is driven low. This feature is confirmed in Table 1 and Figure 1-1 of DS20006088C.
Can the MCP1811AT-012/TT operate with a 1.0 µF ceramic output capacitor?
Yes - the MCP1811AT-012/TT is explicitly characterized and guaranteed stable with a 1.0 µF X7R ceramic capacitor on VOUT, as stated in the Features section and AC/DC specifications table of DS20006088C. No additional ESR or compensation is required.
What is the typical quiescent current of the MCP1811AT-012/TT at room temperature?
The MCP1811AT-012/TT draws 250 nA typical quiescent current (IQ) at TA = +25°C and IOUT = 0, per the "Input Quiescent Current" row in the Electrical Characteristics table (DS20006088C, page 4). This value remains stable across 1.8–5.5 V input range.
Is the MCP1811AT-012/TT compatible with lead-free reflow soldering processes?
Yes - the MCP1811AT-012/TT uses a Pb-free, RoHS-compliant SOT-23 package and is rated for standard JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C for 30 seconds. The device's thermal resistance (θJA = 211.33°C/W) supports reliable thermal performance under these conditions.
MCP1811AT-012/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):
- 1.2V
- 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-012/TT FAQ
1.How can I place an order for MCP1811AT-012/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-012/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-012/TT reliable?
The price and inventory of MCP1811AT-012/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-012/TT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-012/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-012/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-012/TT?
MCP1811AT-012/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-012/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-012/TT?
For technical support, including MCP1811AT-012/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-012/TT requirements.
6.How does Aetrix verify that MCP1811AT-012/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-012/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-012/TT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-012/TT?
All MCP1811AT-012/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-012/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-012/TT part is unused and in its original packaging.
Return procedure for MCP1811AT-012/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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