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Microchip Technology MCP1812BT-033/LT
- Part No.:
- MCP1812BT-033/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812BT-033/LT.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,315
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Product details
Overview
MCP1812BT-033/LT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 3.3V low-dropout linear regulator in a 3-lead SOT-23 package, featuring output discharge during shutdown and stable operation with only 2.2 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 MCP1812BT-033/LT datasheet, MCP1812BT-033/LT pinout, MCP1812BT-033/LT application, or MCP1812BT-033/LT equivalent, key selection criteria include its 300 mA output capability, 400 mV dropout at full load, 5 nA shutdown current (MCP1812B variant), and compatibility with micro-power MCU subsystems requiring rail-to-rail input (1.8–5.5 V) and tight output regulation (±4%).
Technical Context
The MCP1812BT-033/LT implements a PMOS pass transistor architecture enabling ultra-low IQ and fast transient response, with integrated overcurrent protection and an active discharge switch (DT) that pulls VOUT to GND when SHDN = GND. Its feedback loop is optimized for stability with minimal 2.2 µF X7R ceramic output capacitors.
As a member of the MCP1812B subfamily, it omits output discharge functionality - confirmed by device suffix 'B' and absence of discharge transistor (RDCH) specification in electrical tables - and delivers 3.3V output with ±4% tolerance across –40°C to +85°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - ensures reliable biasing of 3.3V logic, RF front-ends, and low-power sensors without external resistive feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, display drivers) while maintaining ultra-low sleep IQ. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or harvested energy sources (e.g., solar, thermal). |
| Shutdown Current | 5 nA typical - reduces system standby power to near-zero, critical for wake-on-event architectures. |
| Input Voltage Range | 1.8V to 5.5V - accommodates single-cell Li-ion (3.0–4.2V), alkaline (1.8–3.2V), and supercapacitor-backed inputs. |
| Dropout Voltage | 400 mV @ 300 mA - allows regulation down to VIN = 3.7V, maximizing usable battery capacity. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - eliminates need for bulky tantalum/Al-elec caps, reducing board area and cost. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5V unregulated input; requires local 1 µF ceramic bypass capacitor per datasheet layout guidelines. |
| VOUT | Regulated output | Delivers stable 3.3V ±4%; must connect ≥2.2 µF X7R ceramic capacitor directly to this pin and GND for stability. |
| GND | Ground reference | Low-impedance return path for regulator ground current only; tie directly to output capacitor's GND pad to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 250 nA typical enables >10-year battery life in 10 µA average-load applications (e.g., wireless sensor nodes). |
| No output discharge (B variant) | Omits internal discharge FET - prevents unintended VOUT collapse during shutdown, preserving state in downstream circuits. |
| Ceramic-capacitor stability | Guaranteed stable with 2.2 µF X7R ceramic output cap - eliminates ESR requirements and simplifies BOM. |
| Overcurrent protection | Current-limit threshold of 500 mA (typical) - protects against short-circuit faults without latch-up or thermal shutdown. |
| Wide temperature range | Specified from –40°C to +85°C junction - suitable for wearable and medical devices operating in ambient environments. |
Applications
| Energy Harvesting Systems | Long-Life Medical Devices |
|---|---|
Use Scenario: Powering ultra-low-power wireless sensor nodes powered by indoor photovoltaic cells or thermoelectric generators. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 3.3V to sub-1 µA sleep-mode MCUs and sub-100 nA RF transceivers. Use Value: 250 nA IQ minimizes parasitic drain, extending usable harvestable energy per cycle and enabling continuous operation without battery replacement. | Use Scenario: Regulating power for implantable or wearable hearing aids with coin-cell batteries. IC Role / Device Role / Timing Role: Main LDO delivering clean 3.3V to analog front-end amplifiers and digital signal processors during intermittent audio processing bursts. Use Value: 400 mV dropout at 300 mA allows full utilization of battery voltage down to 3.7V, increasing usable capacity by ~15% vs. higher-dropout alternatives. |
| Smart Wearables | Ultra-Low-Power IoT Endpoints |
Use Scenario: Supplying power to motion-sensing subsystems (accelerometer + BLE SoC) in fitness trackers. IC Role / Device Role / Timing Role: Always-on regulator enabling instant wake-from-sleep (<400 µs start-up delay) upon motion detection interrupt. Use Value: 5 nA shutdown current ensures negligible leakage during multi-week idle periods, preserving >99.9% of battery charge between activity events. | Use Scenario: Power management for NB-IoT or LoRaWAN endpoint modules deployed in remote infrastructure monitoring. IC Role / Device Role / Timing Role: System-level LDO interfacing with energy-harvesting PMICs to condition output for microcontroller and radio ICs. Use Value: PSRR of –50 dB at 1 kHz suppresses ripple from switching converters or noisy power rails, preventing data corruption in sensitive ADCs and radios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | 150 mA output, 2 µA IQ, no shutdown control, SOT-23-3 | Lacks enable/shutdown pin and output discharge; limited to lower-current, always-on use cases | Select when system load ≤150 mA and shutdown sequencing is unnecessary. |
| Torex XC6210B332MR-G | 300 mA output, 1 µA IQ, 1.6–6.0V input, SOT-25 | 5-pin package adds EN and VOUT sense; higher IQ increases standby power 4× vs. MCP1812BT-033/LT | Choose when tighter load regulation or remote sensing is required, accepting higher sleep current penalty. |
Compared with MCP1700T-3302E/MB and XC6210B332MR-G, the MCP1812BT-033/LT uniquely combines 300 mA drive, 250 nA IQ, and 3-lead simplicity - making it optimal for space-constrained, multi-year battery applications where every nanoamp and millimeter matters.
Availability
MCP1812BT-033/LT is available at Aetrix Electronics and suitable for energy harvesting systems, long-life medical devices, and smart wearables requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1812BT-033/LT 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 was engineered specifically for ultra-low-power, battery- and energy-harvesting–powered applications - prioritizing nanoscale quiescent current, ceramic-capacitor compatibility, and minimal footprint without sacrificing output capability or regulation accuracy.
FAQ
What is the maximum input voltage rating for the MCP1812BT-033/LT?
The MCP1812BT-033/LT has an absolute maximum input voltage rating of +6.0V. However, its specified operating input range is 1.8V to 5.5V. Exceeding 5.5V may cause permanent damage or violate safe operating area limits, especially under high ambient temperatures. Always observe the 5.5V upper limit in functional designs.
Does the MCP1812BT-033/LT include output discharge functionality?
No, the MCP1812BT-033/LT does not include output discharge. The 'B' suffix in its part number identifies it as the MCP1812B variant, which omits the internal discharge transistor (DT). This means VOUT remains floating or held by external loads when SHDN is asserted - unlike the 'A' variant (e.g., MCP1812AT-033/LT), which actively discharges VOUT to GND.
What output capacitor value is required for stability with the MCP1812BT-033/LT?
The MCP1812BT-033/LT requires a minimum 2.2 µF X7R ceramic output capacitor placed directly between VOUT and GND. This value is validated for stability across –40°C to +85°C and all load conditions up to 300 mA. Using smaller values or non-ceramic types (e.g., tantalum) risks oscillation or poor transient response.
Can the MCP1812BT-033/LT operate with a 1.8V input while delivering 3.3V output?
No, the MCP1812BT-033/LT cannot regulate 3.3V output from a 1.8V input. Its minimum input voltage depends on load: ≥2.4V is required for 300 mA output due to the 400 mV typical dropout voltage. At light loads (<1 mA), VIN ≥3.3V is sufficient, but full-rated output demands VIN ≥3.7V.
Is the MCP1812BT-033/LT pin-compatible with other devices in the MCP181X family?
Yes, the MCP1812BT-033/LT shares identical pinout and footprint with all 3-lead SOT-23 variants in the MCP1811A/11B/12A/12B family - including MCP1811AT-033/LT, MCP1812AT-033/LT, and MCP1811BT-033/LT. This allows drop-in substitution for different output current or shutdown behavior, provided the PCB layout accommodates the same 3-pin configuration and thermal pad (if used).
MCP1812BT-033/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 3.3V
- 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:
- SC-70-5
MCP1812BT-033/LT FAQ
1.How can I place an order for MCP1812BT-033/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-033/LT 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-033/LT reliable?
The price and inventory of MCP1812BT-033/LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812BT-033/LT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-033/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-033/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-033/LT?
MCP1812BT-033/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-033/LT 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-033/LT?
For technical support, including MCP1812BT-033/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-033/LT requirements.
6.How does Aetrix verify that MCP1812BT-033/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-033/LT 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-033/LT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-033/LT?
All MCP1812BT-033/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-033/LT, 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-033/LT part is unused and in its original packaging.
Return procedure for MCP1812BT-033/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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