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Microchip Technology MCP1811BT-018/OT
- Part No.:
- MCP1811BT-018/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811BT-018/OT.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
MCP1811BT-018/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 1.8 V output, designed for battery-powered systems requiring multi-year operation. 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 shutdown mode with 5 nA typical supply current - ideal for energy harvesting and wearable electronics.
For engineers reviewing the MCP1811BT-018/OT datasheet, MCP1811BT-018/OT pinout, MCP1811BT-018/OT application, or MCP1811BT-018/OT equivalent, this page delivers verified electrical specs, package mapping to SOT-23-3, functional role in ultra-low-power sleep architectures, and validated alternative options for long-life LDO selection.
Technical Context
The MCP1811BT-018/OT belongs to the MCP1811B variant family - distinguished by absence of output discharge during shutdown and 5 nA typical shutdown current. Its internal architecture uses a PMOS pass transistor enabling ultra-low IQ while maintaining stable regulation across -40°C to +85°C junction temperature.
It delivers 1.8 V ±4% output accuracy at loads up to 150 mA, with dropout voltage ≤600 mV at full load. Stability is guaranteed with ≥1.0 µF X7R ceramic output capacitance and no external compensation required - simplifying layout in space-constrained, low-noise applications like hearing aids and smart sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±4% - tightly regulated rail for 1.8 V logic, RF front-ends, and ultra-low-voltage microcontrollers. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load IoT nodes using CR2032 or coin cells. |
| Shutdown Current | 5 nA typical - ensures negligible drain during deep-sleep modes in energy-harvesting systems. |
| Max Output Current | 150 mA - sufficient for mixed-signal SoCs, BLE radios, and sensor signal chains without thermal derating. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting sources. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic caps; reduces BOM cost and footprint. |
| Dropout Voltage | ≤600 mV at 150 mA - maintains regulation down to 2.4 V input when powering 1.8 V loads from aging batteries. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA compliant, 2.92 mm × 1.6 mm × 1.1 mm body height, exposed pad optional per design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor to minimize PSRR degradation and startup overshoot. |
| VOUT | Regulated output | Delivers stable 1.8 V; connects directly to load and output capacitor; trace routing must avoid noisy digital return paths. |
| GND | Ground reference | Low-impedance return for regulator core; tie to quiet ground plane or output capacitor cathode to optimize PSRR and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on 220 mAh coin cell at 10 µA average system load - critical for sealed medical wearables. |
| No output discharge | Preserves state on downstream circuits during shutdown; avoids unintended reset or leakage through VOUT pull-down paths. |
| Ceramic-cap stable | Eliminates ESR requirements and simplifies filtering - supports miniaturized designs using 0402/0603 1 µF X7R MLCCs. |
| Overcurrent protection | Current-limit foldback (50 mA typical) prevents thermal runaway during short-circuit events without latch-up. |
| Wide temp range | -40°C to +85°C operating junction temperature - qualified for industrial-grade reliability in uncontrolled environments. |
Applications
| Energy Harvesting Nodes | Wearable Medical Sensors |
|---|---|
Use Scenario: Solar- or thermal-harvested power supplies feeding intermittent BLE beacon transmissions in remote environmental monitors. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable harvested voltage (2.0–5.0 V) to clean 1.8 V for MCU and radio during active bursts. Use Value: 5 nA shutdown current minimizes harvest energy loss during 99.9% duty-cycle sleep; 1 µF stability enables smallest possible PCB area. |
Use Scenario: Miniature hearing aids powered by zinc-air batteries requiring decade-level operational life. IC Role / Device Role / Timing Role: Core power rail generator for ultra-low-power DSP and analog front-end, activated only during audio processing windows. Use Value: 250 nA quiescent current extends battery life beyond 5 years; ±4% output tolerance ensures consistent ADC reference performance. |
| Smart Card Interfaces | Long-Life Industrial Loggers |
Use Scenario: Contactless smart cards with embedded secure elements drawing burst current during NFC polling. IC Role / Device Role / Timing Role: Local LDO supplying 1.8 V to cryptographic ICs and EEPROM, activated only during RF field presence. Use Value: Fast start-up (<1 ms) from shutdown ensures immediate response to card reader fields; no output discharge preserves secure element state. |
Use Scenario: Battery-backed temperature/humidity loggers deployed in HVAC ducts or outdoor enclosures for 10+ years. IC Role / Device Role / Timing Role: Main regulator for MSP430-class microcontroller and I²C sensors, cycling between 1-second wake-ups and multi-hour sleep. Use Value: Stable 1.8 V output across -40°C to +85°C ensures accurate sensor readings; 1.8 V compatibility matches low-voltage flash memory interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | Same 1.8 V output, 250 nA IQ, but 250 mA max output and SC70-3 package; includes output discharge. | Higher current capability suits systems with occasional 200 mA peaks; output discharge may conflict with state-retentive designs. | Select when higher peak current is needed and output discharge is acceptable - verify GND routing for noise-sensitive loads. |
| TN01801801000G | 1.8 V, 300 nA IQ, 150 mA, SOT-23-3; no shutdown pin - always-on operation. | Lacks enable/shutdown control; unsuitable for duty-cycled systems; simpler BOM but no deep-sleep optimization. | Choose only for always-on, ultra-low-IQ applications where shutdown functionality is unnecessary and board space is constrained. |
Compared with MCP1700T-1802E/TT and TN01801801000G, the MCP1811BT-018/OT uniquely balances 5 nA shutdown, no output discharge, and SOT-23-3 compatibility - making it optimal for duty-cycled, state-preserving, space-limited designs.
Availability
MCP1811BT-018/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and long-life industrial loggers requiring stable component supply with guaranteed longevity and traceable sourcing.
Supply support for MCP1811BT-018/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 timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1811 series was engineered specifically for ultra-low-power, long-life battery and energy-harvesting applications - emphasizing nanoscale quiescent current, ceramic-cap stability, and robust operation across extended temperature ranges.
FAQ
What is the maximum input voltage rating for the MCP1811BT-018/OT?
The MCP1811BT-018/OT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V violates the recommended operating conditions and risks permanent damage. For reliable long-term use, keep VIN within 1.8 V to 5.5 V as specified in DS20006088C, with derating advised above 85°C junction temperature.
Does the MCP1811BT-018/OT include an enable/shutdown pin?
Yes, the MCP1811BT-018/OT includes a dedicated SHDN pin (pin 1 in SOT-23-3 configuration). When pulled low (≤20% VIN), it places the device in shutdown mode with 5 nA typical supply current. The SHDN pin is internally pulled up and requires no external resistor unless actively controlled.
Can the MCP1811BT-018/OT be used with a 0.47 µF output capacitor?
No - the MCP1811BT-018/OT requires a minimum 1.0 µF ceramic (X7R) output capacitor for guaranteed stability across all operating conditions. Using 0.47 µF risks oscillation, poor load transient response, and output voltage overshoot, as confirmed in Figure 2-5 and Section 4.2 of DS20006088C.
Is the MCP1811BT-018/OT pin-compatible with other MCP1811 variants in SOT-23-3?
Yes - all MCP1811X devices in the 3-lead SOT-23 package share identical pinout: pin 1 = SHDN, pin 2 = GND, pin 3 = VOUT, with VIN on the tab/exposed pad (not used in standard SOT-23-3 variant). The MCP1811BT-018/OT follows this mapping and is mechanically and electrically interchangeable with same-package variants.
What is the typical dropout voltage of the MCP1811BT-018/OT at 100 mA load?
The typical dropout voltage of the MCP1811BT-018/OT at 100 mA load is 400 mV, as specified in the "Dropout Voltage" row of Table 1 (DS20006088C, page 4). This means the device maintains regulation as long as VIN remains ≥2.2 V (1.8 V + 0.4 V) - critical for sustaining operation as primary batteries deplete.
MCP1811BT-018/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):
- 1.8V
- 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-018/OT FAQ
1.How can I place an order for MCP1811BT-018/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-018/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-018/OT reliable?
The price and inventory of MCP1811BT-018/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-018/OT is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-018/OT transactions.
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MCP1811BT-018/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-018/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-018/OT?
For technical support, including MCP1811BT-018/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-018/OT requirements.
6.How does Aetrix verify that MCP1811BT-018/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-018/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-018/OT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-018/OT?
All MCP1811BT-018/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-018/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-018/OT part is unused and in its original packaging.
Return procedure for MCP1811BT-018/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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