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Microchip Technology MCP1812BT-018/OT
- Part No.:
- MCP1812BT-018/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812BT-018/OT.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
MCP1812BT-018/OT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 1.8 V output LDO regulator in SOT-23-3 package, designed for energy harvesting and long-life battery-powered systems requiring stable low-voltage rail with minimal standby power loss.
For engineers reviewing the MCP1812BT-018/OT datasheet, MCP1812BT-018/OT pinout, MCP1812BT-018/OT application, or MCP1812BT-018/OT equivalent, key selection criteria include its 1.8 V output accuracy (±4%), 400 mV dropout at 300 mA, 2.2 µF ceramic capacitor stability requirement, and 5 nA shutdown current - critical for ultra-low-power sleep-mode operation in wearables and medical sensors.
Technical Context
The MCP1812BT-018/OT implements a PMOS pass transistor architecture enabling ultra-low IQ and fast load transient response. Its internal reference and error amplifier maintain output regulation across input voltages from 2.4 V to 5.5 V while supporting full 300 mA continuous output current.
It integrates overcurrent protection and an active discharge transistor (enabled in A-variant), with logic-level shutdown control (VSHDN-HIGH ≥70% VIN) and thermal shutdown. The device operates over –40°C to +85°C junction temperature range and is qualified per JEDEC standards for industrial reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures stable core voltage for 1.8 V logic and RF subsystems without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, sensors) in compact battery-powered designs. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices with extended sleep cycles (e.g., IoT endpoints). |
| Shutdown Current | 5 nA typical (MCP1812B variant) - minimizes leakage during deep-sleep states where system power budget is sub-10 nA. |
| Dropout Voltage | 400 mV max at 300 mA - allows operation down to 2.2 V input, extending usable battery voltage range in single-cell Li-ion/Li-SOCl₂ systems. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM count and board area vs. tantalum; enables low-noise performance (<223 µVrms at 2.5 V). |
| Input Voltage Range | 2.4 V to 5.5 V - compatible with 2-cell alkaline, single-cell Li-ion, and regulated 3.3 V/5 V rails. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236), surface-mount, RoHS-compliant, thermal pad not included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output voltage | Delivers stable 1.8 V to load; requires 2.2 µF ceramic capacitor to ground for stability and noise suppression. |
| VIN | Input supply voltage | Accepts 2.4–5.5 V input; must be decoupled with ≥1 µF ceramic capacitor close to pin to suppress high-frequency noise. |
| GND | Ground reference | Low-impedance return path for output current and internal bias; tie directly to quiet ground plane near output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical quiescent current enables >10-year battery life in 10 µA average-current applications. |
| Active output discharge | Integrated discharge transistor (DT) in MCP1812A variants rapidly discharges VOUT when SHDN = GND - prevents floating outputs and improves system reset integrity. |
| Ceramic capacitor stability | Stable with only 2.2 µF X7R ceramic output cap - eliminates ESR requirements and simplifies layout vs. electrolytic/tantalum solutions. |
| High PSRR at low frequencies | –50 dB @ 1 kHz (no CIN) - suppresses ripple from noisy switchers or shared power rails in mixed-signal systems. |
| Wide temperature operation | –40°C to +85°C junction range - validated for use in wearable electronics and medical devices exposed to ambient thermal cycling. |
Applications
| Energy Harvesting Systems | Wearable Electronics |
|---|---|
Use Scenario: Powering wireless sensor nodes powered by solar cells or thermoelectric generators with intermittent, low-power output. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable harvested energy into stable 1.8 V supply for microcontroller and radio. Use Value: 250 nA IQ extends operational uptime between energy harvest events; 2.2 µF ceramic cap enables miniaturized PCB design. | Use Scenario: Supplying 1.8 V core voltage to Bluetooth Low Energy (BLE) SoCs and motion sensors in smartwatches and fitness bands. IC Role / Device Role / Timing Role: Main LDO delivering regulated rail during active transmission and ultra-low-power retention during sleep. Use Value: 5 nA shutdown current preserves battery capacity during multi-week idle periods; SOT-23-3 footprint saves space on constrained flex PCBs. |
| Medical Hearing Aids | Smart Cards & NFC Tags |
Use Scenario: Providing clean, low-noise 1.8 V supply to ultra-low-power DSPs and MEMS microphones in hearing assistance devices. IC Role / Device Role / Timing Role: Precision analog power rail generator with <223 µVrms output noise and high PSRR to preserve signal integrity. Use Value: Ceramic capacitor stability eliminates audible switching artifacts; 300 mA capability supports burst-mode audio processing. | Use Scenario: Regulating power for contactless ICs in ISO/IEC 14443-compliant smart cards and secure authentication tokens. IC Role / Device Role / Timing Role: Standby-mode LDO maintaining memory and security logic voltage during RF field coupling intervals. Use Value: 250 nA IQ meets stringent ISO 7816-3 power budgets; 1.8 V output matches modern secure element I/O voltage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812-018/OT | Same 1.8 V output and 300 mA rating, but A-variant with integrated output discharge transistor (RDCH = 100 Ω); 10 nA shutdown current vs. 5 nA. | Required where rapid VOUT discharge on shutdown is needed (e.g., to meet reset timing specs or prevent back-powering). | Select MCP1812-018/OT if active discharge is mandatory; otherwise MCP1812BT-018/OT offers lower shutdown IQ. |
| Torex XC6210B182MR-G | 1.8 V, 300 mA, 250 nA IQ, but uses N-channel pass device - requires minimum 2.0 V input (vs. 2.4 V for MCP1812BT), and no integrated discharge. | Suitable for designs with tighter input voltage headroom (≥2.0 V) and no discharge requirement; different pinout (SOT-25). | Choose XC6210B182MR-G only if input voltage drops below 2.4 V in operation and discharge is unnecessary. |
Compared with MCP1812-018/OT, the MCP1812BT-018/OT trades off active discharge capability for 2× lower shutdown current (5 nA vs. 10 nA), making it preferable for multi-year battery applications where discharge timing is non-critical. Versus XC6210B182MR-G, it offers higher minimum input voltage tolerance and guaranteed discharge-free operation but requires slightly more input headroom.
Availability
MCP1812BT-018/OT is available at Aetrix Electronics and suitable for energy harvesting systems, wearable electronics, and medical hearing aids requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1812BT-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 microcontrollers, analog components, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP181X/12X product line delivers ultra-low-power LDO regulators optimized for battery longevity in space-constrained, intermittently powered applications - specifically targeting energy harvesting, wearables, and implantable-grade medical devices.
FAQ
What is the output voltage tolerance of the MCP1812BT-018/OT?
The MCP1812BT-018/OT provides a fixed 1.8 V output with a tolerance of ±4% over temperature (–40°C to +85°C) and load (0–300 mA), as specified in the DS20006088C datasheet. This ensures reliable operation of 1.8 V logic interfaces without requiring external trimming or calibration.
Does the MCP1812BT-018/OT include an output discharge function?
No, the MCP1812BT-018/OT is the B-variant and does not include an integrated output discharge transistor. Only the A-variants (e.g., MCP1812-018/OT) feature this function. The "T" suffix denotes tape-and-reel packaging, not functional difference - the BT part retains the B-variant's 5 nA shutdown current and no discharge capability.
What is the minimum input voltage required for 300 mA output from the MCP1812BT-018/OT?
The MCP1812BT-018/OT requires a minimum input voltage of 2.4 V to sustain 300 mA output current, as defined by its dropout specification (VDROPOUT ≤ 600 mV at 300 mA). Below 2.4 V, output regulation degrades and maximum deliverable current decreases proportionally.
Which output capacitor value is required for stability with the MCP1812BT-018/OT?
The MCP1812BT-018/OT requires a minimum 2.2 µF X7R ceramic output capacitor for guaranteed stability across all operating conditions. Using smaller or non-ceramic capacitors may cause oscillation or degraded transient response, as confirmed in Section 4.2 of DS20006088C.
Is the MCP1812BT-018/OT compatible with lead-free reflow soldering processes?
Yes, the MCP1812BT-018/OT in SOT-23-3 package is rated for standard lead-free reflow profiles per JEDEC J-STD-020, with a peak temperature of 260°C. Its moisture sensitivity level (MSL) is 1, meaning it can be stored indefinitely at ≤30°C/85% RH without baking prior to assembly.
MCP1812BT-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 @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 220 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
MCP1812BT-018/OT FAQ
1.How can I place an order for MCP1812BT-018/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-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 MCP1812BT-018/OT reliable?
The price and inventory of MCP1812BT-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 MCP1812BT-018/OT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-018/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-018/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-018/OT?
MCP1812BT-018/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-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 MCP1812BT-018/OT?
For technical support, including MCP1812BT-018/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-018/OT requirements.
6.How does Aetrix verify that MCP1812BT-018/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-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 MCP1812BT-018/OT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-018/OT?
All MCP1812BT-018/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-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 MCP1812BT-018/OT part is unused and in its original packaging.
Return procedure for MCP1812BT-018/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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