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Microchip Technology MCP1812BT-033/TT
- Part No.:
- MCP1812BT-033/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812BT-033/TT.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,476
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Product details
Overview
MCP1812BT-033/TT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 3.3V low-dropout linear regulator in 3-lead SOT-23 package, featuring output discharge during shutdown and stable operation with 2.2 µF ceramic output capacitor. It operates from 1.8V to 5.5V input and delivers precise ±4% output voltage regulation for battery-powered wearable sensors and medical hearing aids.
For engineers reviewing the MCP1812BT-033/TT datasheet, MCP1812BT-033/TT pinout, MCP1812BT-033/TT application, or MCP1812BT-033/TT equivalent, key selection criteria include its 5 nA shutdown current (MCP1812B variant), 400 mV dropout at 300 mA, and compatibility with energy-harvesting power sources requiring nanowatt-level standby consumption.
Technical Context
The MCP1812BT-033/TT implements a PMOS pass transistor architecture enabling ultra-low IQ and fast load transient response. Its internal error amplifier maintains output regulation across –40°C to +85°C junction temperature while supporting dynamic line/load steps with <100 µs recovery time.
It integrates overcurrent protection with foldback limiting (100 mA at RLOAD = 1 Ω), output discharge switch (RDCH = 100 Ω), and logic-compatible shutdown control (VSHDN-HIGH ≥ 70% VIN). The device requires no external compensation and achieves PSRR of –50 dB at 1 kHz with zero input capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% - ensures stable MCU core voltage under varying load and temperature |
| Max Output Current | 300 mA - supports high-pulse IoT sensor nodes without thermal derating |
| Quiescent Current | 250 nA typical - enables multi-year battery life in always-on wearables |
| Shutdown Current | 5 nA typical - minimizes leakage during deep-sleep modes |
| Dropout Voltage | 400 mV at 300 mA - allows operation down to 3.7 V input from single Li-ion cell |
| Stability Capacitor | 2.2 µF ceramic - reduces BOM cost and PCB area vs. tantalum alternatives |
| PSRR | –50 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output | Delivers 3.3 V to load; requires 2.2 µF ceramic capacitor to GND for stability |
| VIN | Input supply | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin |
| GND | Ground reference | Low-impedance return path for output current and error amplifier; ties to quiet ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low shutdown current | 5 nA typical enables >10-year shelf life in sealed medical devices |
| Output discharge function | Active pull-down on VOUT during SHDN = GND prevents residual voltage hold-up |
| Ceramic capacitor stability | Validated with 2.2 µF X7R ceramic - eliminates ESR dependency and aging drift |
| Wide input voltage range | 1.8–5.5 V accommodates single-cell Li-ion, NiMH, or energy-harvesting sources |
| Overcurrent foldback | Limits short-circuit current to 100 mA - protects PCB traces and upstream source |
Applications
| Energy Harvesting Sensor Node | Smart Hearing Aid |
|---|---|
Use Scenario: Indoor light-harvesting circuit powering BLE beacon with intermittent 100 ms transmit bursts. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 3.3 V to RF SoC and MEMS microphone during active and sleep states. Use Value: 250 nA quiescent current extends operational lifetime beyond 5 years on 20 mAh thin-film battery. | Use Scenario: Miniaturized in-the-ear hearing aid with real-time audio processing and wireless recharging. IC Role / Device Role / Timing Role: Main LDO delivering regulated 3.3 V to DSP and ADC under dynamic 0.1–300 mA load profiles. Use Value: 400 mV dropout at full load enables use of 3.7 V Li-ion cell throughout 90% of discharge curve. |
| Long-Life Wearable Tracker | Implantable Medical Monitor |
Use Scenario: Subcutaneous glucose monitor logging data every 5 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Power management IC providing clean 3.3 V rail to ultra-low-power microcontroller and analog front-end. Use Value: 5 nA shutdown current ensures <1% annual capacity loss during storage and idle periods. | Use Scenario: Class III implantable cardiac rhythm monitor operating for 7+ years without replacement. IC Role / Device Role / Timing Role: Safety-critical LDO regulating voltage to ASIC and telemetry transmitter with fail-safe overcurrent protection. Use Value: Foldback current limit and thermal shutdown prevent unsafe energy dissipation in hermetically sealed housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812-3302E/MB | Same 3.3 V output, 300 mA rating, and 5 nA shutdown current but in 4-lead 1×1 mm UDFN package with exposed thermal pad | Better thermal performance (θJA = 91°C/W vs. 211°C/W) for space-constrained PCBs with limited copper area | Select when board layout allows UDFN and thermal management is critical above 150 mA continuous load |
| Torex XC6210B332MR-G | 300 mA, 3.3 V, 250 nA IQ, but no output discharge and 10 nA shutdown current (vs. 5 nA) | Lacks active VOUT discharge - unsuitable where rapid power-down sequencing is required | Choose only if output discharge is not needed and footprint compatibility with SOT-23 is mandatory |
Compared with MCP1812-3302E/MB, the MCP1812BT-033/TT offers identical electrical specs in a legacy SOT-23 package ideal for through-hole prototyping and rework; versus XC6210B332MR-G, it provides superior shutdown leakage control and integrated discharge for systems requiring strict power-state fidelity.
Availability
MCP1812BT-033/TT is available at Aetrix Electronics and suitable for energy harvesting sensor nodes, smart hearing aids, and long-life wearable trackers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1812BT-033/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, headquartered in Chandler, Arizona.
The MCP181X/12X family was designed specifically for ultra-low-power battery-operated systems where nanowatt quiescent current and rapid wake-up from shutdown are essential design requirements.
FAQ
What is the maximum input voltage rating for the MCP1812BT-033/TT?
The MCP1812BT-033/TT has an absolute maximum input voltage rating of +6.0 V. Operation beyond this level risks permanent damage. For reliable continuous operation, the input voltage must remain within the specified 1.8 V to 5.5 V range, with minimum VIN dependent on load current and dropout voltage - e.g., ≥3.7 V required for 300 mA output at 3.3 V.
Does the MCP1812BT-033/TT require an external shutdown resistor?
No, the MCP1812BT-033/TT does not require an external pull-up resistor on the SHDN pin. Its shutdown input is CMOS-compatible with logic thresholds defined as VSHDN-HIGH ≥ 70% VIN and VSHDN-LOW ≤ 20% VIN. Direct connection to MCU GPIO or open-drain driver is sufficient; internal biasing ensures proper state detection without external components.
Can the MCP1812BT-033/TT be used with a 1 µF output capacitor?
No - the MCP1812BT-033/TT requires a minimum 2.2 µF ceramic (X7R) output capacitor for stability, as confirmed in the datasheet's AC/DC characteristics table and Figure 2-7. Using 1 µF may cause oscillation or poor transient response. The 2.2 µF value is validated across –40°C to +85°C and ensures PSRR and load regulation meet spec.
How does the output discharge feature work in the MCP1812BT-033/TT?
When SHDN is pulled low, the MCP1812BT-033/TT activates an internal discharge transistor (RDCH = 100 Ω typical) between VOUT and GND, actively pulling the output voltage to ground within microseconds. This prevents residual charge from interfering with downstream logic reset sequences or causing latch-up in powered-off subsystems - a critical function in multi-rail power architectures.
Is the MCP1812BT-033/TT RoHS compliant and halogen-free?
Yes, the MCP1812BT-033/TT is RoHS compliant and halogen-free per Microchip's standard product environmental policy. The "TT" suffix denotes tape-and-reel packaging compliant with J-STD-020 moisture sensitivity level 1 (MSL-1), suitable for standard SMT assembly without baking.
MCP1812BT-033/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):
- 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:
- SOT-23-3
MCP1812BT-033/TT FAQ
1.How can I place an order for MCP1812BT-033/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-033/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 MCP1812BT-033/TT reliable?
The price and inventory of MCP1812BT-033/TT 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/TT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-033/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-033/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-033/TT?
MCP1812BT-033/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-033/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 MCP1812BT-033/TT?
For technical support, including MCP1812BT-033/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-033/TT requirements.
6.How does Aetrix verify that MCP1812BT-033/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-033/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 MCP1812BT-033/TT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-033/TT?
All MCP1812BT-033/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-033/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 MCP1812BT-033/TT part is unused and in its original packaging.
Return procedure for MCP1812BT-033/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1812BT-033/TT Tags
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