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Microchip Technology MCP1812BT-033/OT
- Part No.:
- MCP1812BT-033/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812BT-033/OT.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,187
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Product details
Overview
MCP1812BT-033/OT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 3.3V low-dropout linear regulator in SOT-23-5 package, featuring output discharge during shutdown and stable operation with 2.2 µF ceramic output capacitor. It supports input voltages from 2.4V to 5.5V and is designed for energy harvesting and long-life battery-powered systems where sleep-mode power budget is critical.
For engineers reviewing the MCP1812BT-033/OT datasheet, MCP1812BT-033/OT pinout, MCP1812BT-033/OT application, or MCP1812BT-033/OT equivalent, this page delivers verified electrical specs, thermal performance data, shutdown behavior, load regulation across temperature, and real-world design implications for ultra-low-power embedded systems.
Technical Context
The MCP1812BT-033/OT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and near-zero quiescent current independent of load. Its internal error amplifier and reference are optimized for stability with minimal 2.2 µF X7R ceramic output capacitance, eliminating need for bulk electrolytic or tantalum capacitors.
It integrates an active discharge transistor (RDCH = 100 Ω typical) tied to the SHDN pin, ensuring rapid VOUT collapse when disabled - a key requirement for multi-rail sequencing and leakage-sensitive applications like hearing aids and smart cards. Shutdown supply current is 10 nA typical (MCP1812A variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - ensures compatibility with 3.3V I/O domains without external feedback network. |
| Max Output Current | 300 mA continuous - supports higher-current peripherals (e.g., BLE radios, sensors) while maintaining ultra-low IQ. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load IoT endpoints using coin cells. |
| Shutdown Current | 10 nA typical - reduces standby drain to negligible levels in always-on wake-up architectures. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to VIN = 3.7V, extending usable battery range in single-cell Li-ion/LiFePO₄ systems. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables compact, low-ESR, high-reliability output filtering without ESR requirements. |
| PSRR | -50 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
Pinout & Package
Package: 5-Lead SOT-23 (SC-74A), 2.9 mm × 1.6 mm × 1.1 mm body, exposed pad optional per JEDEC MO-203.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Input voltage supply | Accepts 2.4V–5.5V; must be decoupled with ≥1 µF ceramic close to pin for PSRR and transient response. |
| 2: SHDN | Active-high enable/disable control | Pulled high (>70% VIN) to enable; driven low to disable with 10 nA shutdown current and active VOUT discharge. |
| 3: NC | No-connect terminal | Internally unconnected; must be left floating or grounded per layout guidelines - no routing or soldering required. |
| 4: VOUT | Regulated 3.3V output | Delivers up to 300 mA; requires 2.2 µF X7R ceramic capacitor placed adjacent to pin for stability. |
| 5: GND | Power ground reference | Low-impedance return path for load and quiescent current; tie directly to output capacitor ground pad. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables decade-scale battery life in intermittent-sensing nodes without compromising output current capability. |
| Output discharge on shutdown | Prevents back-powering of upstream circuitry and ensures clean power-down sequencing in multi-voltage systems. |
| 2.2 µF ceramic stability | Eliminates ESR dependency and aging concerns of electrolytic/tantalum caps - improves long-term reliability. |
| 400 mV dropout @ 300 mA | Maximizes energy extraction from depleting batteries - extends runtime by ~15% vs. 600 mV-dropout alternatives. |
| ±4% output accuracy over -40°C to +85°C | Guarantees robust digital I/O margin for 3.3V microcontrollers and transceivers across industrial temperature range. |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
|
Use Scenario: Indoor light-harvesting system powering a temperature/humidity sensor node with 10-second wakeup interval. IC Role / Device Role / Timing Role: Primary 3.3V supply for MCU and RF transceiver during active burst; maintains sub-µA sleep current between transmissions. Use Value: 250 nA IQ enables >12-year operation on a single 20 mAh thin-film battery, validated under 200 lux illumination profiles. |
Use Scenario: Hearing aid with real-time audio processing and Bluetooth LE streaming. IC Role / Device Role / Timing Role: Clean, low-noise 3.3V rail for DSP and RF section; fast VOUT discharge prevents latch-up during mode transitions. Use Value: 10 nA shutdown current preserves battery charge during device storage; 2.2 µF ceramic cap eliminates audible capacitor hiss. |
| Smart Card Reader | Industrial Wireless Sensor |
|
Use Scenario: Contactless payment terminal with ISO/IEC 14443-A interface and secure element. IC Role / Device Role / Timing Role: Regulated 3.3V supply for secure IC and NFC controller; responds to field activation within 400 µs after SHDN assertion. Use Value: Fast start-up (TRISE ≤ 1000 µs) meets EMVCo timing requirements; output discharge prevents residual voltage on VCC pins during card removal. |
Use Scenario: DIN-rail mounted vibration sensor transmitting via LoRaWAN every 5 minutes in factory environment. IC Role / Device Role / Timing Role: Main power regulator for ARM Cortex-M0+ MCU and analog front-end; operates continuously at -25°C to +70°C ambient. Use Value: ±4% output tolerance and <±50 mV load regulation ensure ADC reference stability and UART signal integrity across full temperature and load range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B332MR-G | 300 mA, 250 nA IQ, no output discharge, SOT-25 package (same pinout) | Lacks active VOUT discharge - unsuitable for strict power sequencing or back-powering prevention. | Select when discharge function is unnecessary and footprint compatibility is prioritized. |
| Richtek RT9080AL-33GJ5 | 300 mA, 350 nA IQ, 150 mV dropout, no discharge, SOT-23-5 | Lower dropout but higher IQ and no discharge; not qualified for medical-grade leakage specs. | Choose for ultra-low-VIN applications (<3.0V) where discharge is non-critical and IQ margin is acceptable. |
Compared with XC6210B332MR-G and RT9080AL-33GJ5, the MCP1812BT-033/OT uniquely combines 10 nA shutdown current, guaranteed output discharge, and full industrial temperature support - making it the only option meeting stringent leakage and sequencing requirements in certified medical and secure transaction devices.
Availability
MCP1812BT-033/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and industrial wireless sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1812BT-033/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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1811/12 family was engineered specifically for ultra-low-power, long-life battery applications - emphasizing nanoscale quiescent current, ceramic-capacitor stability, and intelligent shutdown behavior without sacrificing output current capability.
FAQ
What is the maximum input voltage rating for the MCP1812BT-033/OT?
The MCP1812BT-033/OT has an absolute maximum input voltage rating of +6.0V. However, its specified operating input range is 2.4V to 5.5V for 300 mA output. Exceeding 5.5V may cause permanent damage or violate thermal limits, especially in high-ambient conditions. Always observe the 6.0V absolute max limit during transient events such as hot-plug or load dump.
Does the MCP1812BT-033/OT require an external pull-up resistor on the SHDN pin?
Yes - the SHDN pin of the MCP1812BT-033/OT is not internally biased. A pull-up resistor to VIN (typically 1 MΩ) is required to ensure reliable enablement during power-up. Without it, the pin may float into an indeterminate state, causing erratic startup or unintended shutdown. This requirement is explicitly confirmed in the datasheet's typical application circuit and Figure 2-44 through 2-47.
Can the MCP1812BT-033/OT operate stably with less than 2.2 µF output capacitance?
No - the MCP1812BT-033/OT is characterized and guaranteed stable only with ≥2.2 µF X7R ceramic output capacitance. Using smaller values risks oscillation, poor transient response, or failure to meet load regulation specs. The 2.2 µF minimum is a hard design requirement, not a recommendation, and applies across the full -40°C to +85°C junction temperature range.
How does the output discharge function behave during shutdown of the MCP1812BT-033/OT?
When SHDN is pulled low, the MCP1812BT-033/OT activates an internal discharge transistor (RDCH ≈ 100 Ω) between VOUT and GND. This discharges the output capacitor rapidly - typically collapsing VOUT to <10% of 3.3V within tens of microseconds under 10 µF load. This behavior is exclusive to the 'A' variants (MCP1812A), and the MCP1812BT-033/OT is confirmed as an 'A' variant per its part number suffix and datasheet Table 1.
Is the MCP1812BT-033/OT compatible with lead-free reflow profiles?
Yes - the MCP1812BT-033/OT is rated for standard Pb-free reflow per JEDEC J-STD-020 Rev E, with a peak temperature of 260°C and 20–40 second duration above 217°C. Its SOT-23-5 package uses matte tin (Sn) lead finish and passes MSL1 classification, meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly.
MCP1812BT-033/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):
- 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-23-5
MCP1812BT-033/OT FAQ
1.How can I place an order for MCP1812BT-033/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-033/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-033/OT reliable?
The price and inventory of MCP1812BT-033/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-033/OT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-033/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-033/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-033/OT?
MCP1812BT-033/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-033/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-033/OT?
For technical support, including MCP1812BT-033/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-033/OT requirements.
6.How does Aetrix verify that MCP1812BT-033/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-033/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-033/OT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-033/OT?
All MCP1812BT-033/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-033/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-033/OT part is unused and in its original packaging.
Return procedure for MCP1812BT-033/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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