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Microchip Technology MCP1811BT-012/TT
- Part No.:
- MCP1811BT-012/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811BT-012/TT.pdf
- Description:
- IC REG LINEAR 1.2V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,906
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Product details
Overview
MCP1811BT-012/TT from Microchip Technology is a 150 mA ultra-low quiescent current (250 nA typical) fixed-output 1.2 V LDO linear regulator in 3-lead SOT-23 package, designed for energy harvesting and long-life battery-powered systems where sleep-mode power budget is critical. It operates from 1.8V to 5.5V input, supports ceramic output capacitors as low as 1.0 µF, and includes overcurrent protection and output discharge during shutdown.
For engineers reviewing the MCP1811BT-012/TT datasheet, MCP1811BT-012/TT pinout, MCP1811BT-012/TT application, or MCP1811BT-012/TT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases in wearable and medical electronics, and validated alternative options for ultra-low-power LDO selection.
Technical Context
The MCP1811BT-012/TT belongs to the MCP1811B variant - distinguished by 5 nA typical shutdown current and absence of output discharge functionality (unlike MCP1811A). Its internal error amplifier and PMOS pass transistor enable stable regulation with minimal dropout voltage (400 mV typical at 150 mA load) across –40°C to +85°C junction temperature.
It uses a dedicated SHDN pin for logic-controlled enable/disable, with valid high threshold ≥70% VIN and low threshold ≤20% VIN. Ground current remains tightly controlled (90–110 µA at zero load), and PSRR reaches –50 dB at 1 kHz without input capacitor - critical for noise-sensitive analog or RF subsystems powered from shared rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for low-voltage MCUs, sensors, and RF front-ends requiring stable sub-1.8 V supply. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or harvested energy sources without significant standby drain. |
| Shutdown Current | 5 nA typical - reduces system-level leakage to negligible levels during deep-sleep modes in wearables or IoT endpoints. |
| Max Output Current | 150 mA - sufficient to power entire ultra-low-power microcontrollers (e.g., PIC XLP series) plus peripheral sensors simultaneously. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, or energy-harvesting transducers (e.g., solar, thermal, RF). |
| Stability Capacitor | 1.0 µF ceramic (X7R) - enables compact, low-cost, low-noise designs without tantalum or electrolytic components. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to ~1.6 V input, maximizing usable battery voltage range before cutoff. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.6 mm × 1.1 mm body, surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V unregulated input; requires local 1 µF ceramic decoupling near pin for stability and transient response. |
| GND | Ground reference | Low-impedance return path for regulator ground current only; must connect directly to output capacitor cathode for optimal PSRR. |
| VOUT | Regulated output | Delivers stable 1.2 V ±4%; requires minimum 1.0 µF X7R ceramic capacitor (0603 or larger) placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Extends battery life in intermittent-operation devices (e.g., BLE beacons) by minimizing sleep-state current draw. |
| 5 nA shutdown mode | Enables true zero-power standby in applications like smart cards or emergency medical sensors awaiting wake-up trigger. |
| No output discharge | Preserves stored charge on downstream capacitors during shutdown - beneficial for systems needing fast restart or state retention. |
| Ceramic-capacitor stable | Eliminates ESR requirements and aging concerns of electrolytics; reduces board area and BOM cost while improving reliability. |
| Overcurrent protection | Current-limit foldback (50 mA typical) prevents thermal runaway during short-circuit events without latch-up or damage. |
Applications
| Energy Harvesting Node | Smart Wearable Sensor |
|---|---|
|
Use Scenario: Indoor light-harvesting circuit powering a temperature/humidity sensor node with BLE transmission every 5 minutes. IC Role / Device Role / Timing Role: Primary power regulator converting variable 2.2–4.0 V photodiode output to stable 1.2 V for MCU and sensor ICs. Use Value: 250 nA quiescent current ensures >95% of harvested energy reaches the load during 99.9% idle time - doubling usable runtime vs. conventional LDOs. |
Use Scenario: Compact wrist-worn health monitor with optical heart-rate sensor and ultra-low-power MCU. IC Role / Device Role / Timing Role: Core supply rail for analog front-end and digital core, enabling <1 µA system sleep current. Use Value: 5 nA shutdown current allows full system hibernation between measurements - extending CR2032 battery life beyond 18 months. |
| Hearing Aid Audio Path | Secure Smart Card |
|
Use Scenario: Miniature rechargeable hearing aid using thin-film battery and MEMS microphone preamp. IC Role / Device Role / Timing Role: Low-noise 1.2 V supply for analog signal chain, minimizing audible hiss and distortion. Use Value: Ceramic-stable operation and 169 µVrms output noise (10 Hz–100 kHz) preserve SNR in audio band without added filtering. |
Use Scenario: Contactless payment card with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: Power management IC activated only during RF field coupling; no discharge preserves internal state. Use Value: Absence of output discharge avoids unintended reset or data loss when NFC field collapses - ensuring transaction integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1202E/TT | Same 1.2 V output, 250 nA IQ, but 150 mA max output limited to 6 V max input; no shutdown pin - always-on operation. | Suitable for space-constrained always-on sensors where enable control is unnecessary and input stays below 6 V. | Select when system does not require active shutdown and VIN never exceeds 6 V; simpler layout (no SHDN routing). |
| TN0120D1202RT | 1.2 V, 200 nA IQ, 100 mA output, 5-pin SOT-23 package with separate EN and GND pins; 300 mV dropout at 100 mA. | Better dropout performance at lower loads, but reduced current capability and higher pin count limits integration density. | Prefer for ultra-deep-sleep applications demanding <200 nA IQ and moderate load (<100 mA); verify PCB footprint compatibility. |
Compared with MCP1700T-1202E/TT and TN0120D1202RT, the MCP1811BT-012/TT uniquely balances 150 mA drive, 5 nA shutdown, and 3-pin simplicity - making it optimal for battery-gated systems requiring both high peak current and nanowatt hibernation.
Availability
MCP1811BT-012/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and secure smart cards requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811BT-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1811X/12X product line was engineered specifically for ultra-low-power battery and energy-harvesting applications - prioritizing nanowatt quiescent operation, ceramic-capacitor stability, and minimal footprint without sacrificing output current capability.
FAQ
What is the maximum input voltage rating for the MCP1811BT-012/TT?
The MCP1811BT-012/TT has an absolute maximum input voltage rating of +6.0 V. However, its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate parametric guarantees - always ensure VIN remains within the operational range during normal use and transient conditions.
Does the MCP1811BT-012/TT include output discharge functionality during shutdown?
No, the MCP1811BT-012/TT does not include output discharge. As a member of the MCP1811B variant family, it omits the internal discharge transistor present in MCP1811A/12A devices. This means VOUT remains floating or holds residual charge after SHDN is pulled low - preserving downstream state in applications like secure smart cards.
Can the MCP1811BT-012/TT operate with a 0.47 µF ceramic output capacitor?
No - the MCP1811BT-012/TT requires a minimum of 1.0 µF X7R ceramic output capacitor for guaranteed stability across all operating conditions. Using 0.47 µF risks oscillation, poor load transient response, and output voltage overshoot; Microchip's datasheet explicitly specifies 1.0 µF as the minimum for MCP1811X devices.
What is the typical dropout voltage of the MCP1811BT-012/TT at 100 mA load?
The typical dropout voltage of the MCP1811BT-012/TT is 400 mV at 150 mA load. At 100 mA, it is lower - approximately 280–320 mV based on Figure 2-11 (MCP1811X, VR = 4.0 V) and proportional scaling. This enables reliable regulation even as battery voltage declines to ~1.52 V under 100 mA load.
Is the MCP1811BT-012/TT pin-compatible with other variants in the MCP1811X/12X family?
Yes - the MCP1811BT-012/TT in 3-lead SOT-23 shares identical pinout (VIN, GND, VOUT) with all other 3-lead variants including MCP1811AT-012/TT and MCP1812BT-012/TT. However, functional differences (e.g., output discharge, shutdown current, max output current) mean direct substitution requires verification of system-level timing, load, and control logic requirements.
MCP1811BT-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
MCP1811BT-012/TT FAQ
1.How can I place an order for MCP1811BT-012/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-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 MCP1811BT-012/TT reliable?
The price and inventory of MCP1811BT-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 MCP1811BT-012/TT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-012/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-012/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-012/TT?
MCP1811BT-012/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-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 MCP1811BT-012/TT?
For technical support, including MCP1811BT-012/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-012/TT requirements.
6.How does Aetrix verify that MCP1811BT-012/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-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 MCP1811BT-012/TT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-012/TT?
All MCP1811BT-012/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-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 MCP1811BT-012/TT part is unused and in its original packaging.
Return procedure for MCP1811BT-012/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1811BT-012/TT Tags
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