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Microchip Technology MCP1811BT-012/OT
- Part No.:
- MCP1811BT-012/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811BT-012/OT.pdf
- Description:
- IC REG LINEAR 1.2V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,585
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Product details
Overview
MCP1811BT-012/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 1.2 V output, designed for energy harvesting and long-life battery-powered systems. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features overcurrent protection and output discharge during shutdown.
For engineers reviewing the MCP1811BT-012/OT datasheet, MCP1811BT-012/OT pinout, MCP1811BT-012/OT application, or MCP1811BT-012/OT equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options - all grounded in Microchip's DS20006088C documentation.
Technical Context
The MCP1811BT-012/OT belongs to the MCP1811X family (150 mA variant) and implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 150 mA) and stable operation with minimal external capacitance. Its internal reference and error amplifier maintain ±4% output accuracy across -40°C to +85°C junction temperature.
It integrates a dedicated discharge transistor (RDCH = 100 Ω typical) activated when SHDN = GND - a feature exclusive to MCP1811A/12A variants - enabling rapid VOUT discharge to prevent residual bias in sleep-mode systems. Shutdown current is 10 nA typical, confirming its suitability for multi-year battery deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - enables direct powering of ultra-low-voltage MCUs (e.g., PIC XLP, ARM Cortex-M0+) without external feedback. |
| Max Output Current | 150 mA - sufficient for sensor nodes, BLE transceivers, and sub-100 µA sleep-state microcontrollers under active load. |
| Quiescent Current | 250 nA typical - reduces battery drain to <0.22 mAh/year, extending coin-cell life beyond 10 years in duty-cycled applications. |
| Shutdown Current | 10 nA typical - ensures near-zero leakage during deep-sleep modes, critical for energy-harvesting storage buffers. |
| Dropout Voltage | 400 mV typical at 150 mA - allows operation down to VIN = 1.6 V while maintaining regulation, maximizing usable battery range. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, reducing PCB area and BOM cost. |
| Operating Temp | -40°C to +85°C - qualified for industrial and wearable environments where thermal cycling impacts reliability. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236). Compact footprint (2.92 mm × 1.3 mm × 1.0 mm), thermally enhanced with exposed pad option not present in this variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 1.8–5.5 V; must be decoupled with ≥0.1 µF ceramic capacitor close to pin to suppress high-frequency noise. |
| 2 (GND) | Ground Reference | Low-impedance return path for regulator ground current only; tie directly to output capacitor cathode for optimal PSRR. |
| 3 (VOUT) | Regulated Output | Delivers stable 1.2 V; requires ≥1.0 µF X7R ceramic capacitor at pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 (220 mAh) in 1-second wake/sleep cycles with 100 µA active current. |
| Output Discharge (DT) | Active discharge path (100 Ω) pulls VOUT to GND within microseconds after SHDN assertion - prevents back-powering of upstream circuitry. |
| Ceramic capacitor stability | Eliminates ESR requirements; allows use of low-cost, small-footprint 0603/0805 1.0 µF X7R caps instead of larger, higher-ESR alternatives. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events without latch-up. |
| PSRR (-50 dB @ 1 kHz) | Rejects switching noise from adjacent DC-DC converters, preserving signal integrity in mixed-signal sensor front-ends. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
Use Scenario: Powering a wireless environmental sensor node powered by a solar cell + supercapacitor buffer, operating 10 seconds active / 5 minutes sleep. IC Role / Device Role: Primary LDO delivering regulated 1.2 V to MCU and RF transceiver during active bursts; discharges output between cycles to eliminate leakage paths. Use Value: 250 nA IQ extends supercapacitor hold-up time by 3.2× vs. conventional LDOs, enabling reliable operation under low-light conditions. |
Use Scenario: Supplying power to a digital signal processor and MEMS microphone in a rechargeable hearing aid with 30-day battery life target. IC Role / Device Role: Low-noise, low-IQ regulator for DSP core rail; output discharge prevents audio pop during power-on/off transitions. Use Value: 1.0 µF ceramic stability reduces component height to <0.55 mm - critical for ultra-thin earpiece form factor. |
| Smart Card Reader | Wearable Fitness Tracker |
Use Scenario: Contactless smart card reader powered by USB-C VBUS, requiring fast turn-on and zero residual voltage on removal. IC Role / Device Role: Regulator for secure element and NFC controller; SHDN-controlled discharge ensures VOUT drops to GND within 100 µs after cable disconnect. Use Value: 10 nA shutdown current meets ISO/IEC 14443-4 power-off timing requirements without auxiliary discharge circuitry. |
Use Scenario: Heart-rate monitor using optical PPG sensor and BLE SoC, worn continuously for 7 days per charge. IC Role / Device Role: Main supply for sensor analog front-end and BLE radio; low dropout preserves battery voltage down to 1.6 V. Use Value: 400 mV dropout at 150 mA extends usable battery capacity by 18% compared to 600 mV-dropout LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-012/OT | No output discharge transistor; 10 nA shutdown current identical; same 150 mA rating and 1.2 V output. | Lacks active VOUT discharge - unsuitable where rapid rail collapse is required (e.g., secure boot, NFC hot-plug). | Select when system design uses external pull-down or does not require sub-100 µs VOUT decay. |
| Torex XC6210B122MR-G | 250 nA IQ, 150 mA, 1.2 V output; no discharge function; requires 2.2 µF min. output cap (vs. 1.0 µF for MCP1811BT). | Higher minimum COUT increases solution size and cost; lacks integrated discharge path for safety-critical discharge. | Consider only if footprint compatibility with Torex's SOT-23-3 is prioritized over discharge capability and capacitor savings. |
Compared with MCP1811AT-012/OT and XC6210B122MR-G, the MCP1811BT-012/OT uniquely combines 1.0 µF ceramic stability, integrated output discharge, and 250 nA IQ - making it the only choice for space-constrained, energy-harvested, or security-sensitive designs requiring guaranteed VOUT collapse.
Availability
MCP1811BT-012/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and wearable fitness trackers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811BT-012/OT 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, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1811X/12X family was engineered specifically for ultra-low-power, battery- and energy-harvesting–powered applications - emphasizing nanoscale quiescent current, minimal external components, and robust performance across wide temperature and load ranges.
FAQ
What is the maximum input voltage rating for the MCP1811BT-012/OT?
The MCP1811BT-012/OT 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 functional specifications, even if below the 6.0 V absolute limit. Always ensure VIN remains within 1.8–5.5 V during normal operation.
Does the MCP1811BT-012/OT require an external shutdown control signal?
Yes - the MCP1811BT-012/OT includes a dedicated SHDN pin (pin 1 in 5-lead packages; not present in 3-lead SOT-23). However, the MCP1811BT-012/OT variant uses the 3-lead SOT-23 package, which omits the SHDN pin entirely. In this configuration, the device operates permanently enabled - shutdown functionality is physically unavailable.
Can the MCP1811BT-012/OT drive a 150 mA load across its full temperature range?
Yes - the MCP1811BT-012/OT is rated for 150 mA continuous output current across its full operating junction temperature range of -40°C to +85°C. This is confirmed in Table 1-1 of DS20006088C, where "Maximum Continuous Output Current" is specified as 150 mA for MCP1811X devices, with no derating required within the specified thermal limits.
Is the 1.2 V output voltage of the MCP1811BT-012/OT adjustable via external resistors?
No - the MCP1811BT-012/OT is a fixed-output variant with factory-trimmed 1.2 V regulation. It does not include feedback pins or external resistor connections. The "T" in the part number denotes the SOT-23 package, and "012" explicitly indicates the 1.2 V output. Adjustable versions (e.g., MCP1811T-XXX/OT) are not offered in this family.
What is the purpose of the output discharge feature in the MCP1811BT-012/OT?
The output discharge feature in the MCP1811BT-012/OT actively pulls the VOUT pin to GND through an internal 100 Ω transistor when shutdown is asserted - but only in packages that include the SHDN pin (e.g., 5-lead SOT-23). Since the MCP1811BT-012/OT uses the 3-lead SOT-23, this feature is not implemented. The "BT" suffix confirms it is the discharge-capable *variant*, but physical pinout determines actual functionality - here, discharge is inactive due to missing SHDN terminal.
MCP1811BT-012/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
MCP1811BT-012/OT FAQ
1.How can I place an order for MCP1811BT-012/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-012/OT 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/OT reliable?
The price and inventory of MCP1811BT-012/OT 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/OT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-012/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-012/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-012/OT?
MCP1811BT-012/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-012/OT 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/OT?
For technical support, including MCP1811BT-012/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-012/OT requirements.
6.How does Aetrix verify that MCP1811BT-012/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-012/OT 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/OT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-012/OT?
All MCP1811BT-012/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-012/OT, 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/OT part is unused and in its original packaging.
Return procedure for MCP1811BT-012/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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