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Microchip Technology MCP1812AT-033/LT
- Part No.:
- MCP1812AT-033/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812AT-033/LT.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,684
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Product details
Overview
MCP1812AT-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 - ideal for energy harvesting and long-life battery-powered wearable electronics.
For engineers reviewing the MCP1812AT-033/LT datasheet, MCP1812AT-033/LT pinout, MCP1812AT-033/LT application, or MCP1812AT-033/LT equivalent, this page delivers verified technical context, package-specific pin functionality, real-world use-value metrics, and validated alternative options for ultra-low-power LDO selection in space-constrained, multi-year battery designs.
Technical Context
The MCP1812AT-033/LT implements a PMOS pass transistor architecture enabling 400 mV typical dropout at 300 mA load, with integrated output discharge switch (RDCH = 100 Ω) activated when SHDN = GND. Its internal error amplifier and reference maintain ±4% output voltage accuracy across –40°C to +85°C junction temperature.
It operates from 2.4V to 5.5V input while delivering regulated 3.3V output, supports dynamic load steps up to 300 mA with <100 µs recovery, and achieves –50 dB PSRR at 1 kHz without input capacitor - all while drawing just 5 nA typical shutdown current (MCP1812B variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - ensures compatibility with 3.3V logic rails and ADC references without external feedback. |
| Max Output Current | 300 mA continuous - sufficient to power microcontrollers, BLE radios, and sensors in compact wearables. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell–powered devices with periodic wake-up cycles. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to 3.7V input, extending usable range of single Li-ion cells. |
| Shutdown Current | 10 nA typical (MCP1812A) - reduces system standby leakage to sub-nA levels when paired with ultra-low-IQ MCUs. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, saving PCB area and cost. |
| PSRR @ 1 kHz | –50 dB (no CIN) - suppresses switching noise from DC/DC converters without requiring input filtering. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm profile, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.4V–5.5V; must be decoupled with ≥1 µF ceramic near pin to ensure stability and transient response. |
| VOUT | Regulated 3.3V output | Delivers up to 300 mA; requires 2.2 µF X7R ceramic capacitor directly at pin for loop stability and low noise. |
| GND | Ground reference | Low-impedance return path for load and internal circuitry; tie to quiet ground plane or output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical operating current enables >10-year runtime on CR2032 in sensor nodes with 1-second wake-up intervals. |
| Output discharge | Active discharge path (100 Ω) pulls VOUT to GND within microseconds of SHDN assertion - prevents residual voltage hold-up in safety-critical shutdowns. |
| Ceramic capacitor stability | Guaranteed stable with 2.2 µF X7R ceramic only - eliminates ESR requirements and simplifies BOM vs. traditional LDOs. |
| Wide input range | 2.4V–5.5V operation supports direct connection to single-cell Li-ion (3.0–4.2V), LiFePO4, or dual alkaline sources. |
| High PSRR without CIN | –50 dB at 1 kHz with no input capacitor - reduces component count and board area in noise-sensitive analog signal chains. |
Applications
| Energy Harvesting Node | Smart Wearable Sensor |
|---|---|
|
Use Scenario: Indoor light-harvesting system powering an environmental sensor node with intermittent RF transmission. IC Role / Device Role / Timing Role: Primary 3.3V power rail regulator, enabling MCU and radio operation during harvested-energy bursts. Use Value: 250 nA IQ minimizes dark-current drain, while 2.2 µF ceramic stability allows ultra-thin PCB stacking in compact form factors. |
Use Scenario: Fitness tracker with optical heart-rate monitor and BLE radio operating on a 180 mAh coin cell. IC Role / Device Role / Timing Role: Main system LDO supplying 3.3V to MCU, sensor hub, and transceiver during active measurement windows. Use Value: 300 mA capability supports concurrent LED drive and radio transmit; 400 mV dropout extends usable battery voltage down to 3.7V. |
| Hearing Aid Front-End | Industrial Wireless Sensor |
|
Use Scenario: Miniature hearing aid with analog microphone preamp and low-latency DSP processing. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for analog signal chain and mixed-signal ASIC. Use Value: –50 dB PSRR at 1 kHz suppresses switching noise from adjacent DC/DC converters, preserving SNR in audio band. |
Use Scenario: Remote vibration sensor deployed in oil-field equipment with 10+ year maintenance interval. IC Role / Device Role / Timing Role: Long-life LDO powering ultra-low-power MCU and MEMS accelerometer during periodic wake-ups. Use Value: 10 nA shutdown current ensures annual self-discharge remains below 0.1% of battery capacity over decade-long deployments. |
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, but no output discharge; requires 1 µF ceramic; 3.3V ±2% accuracy. | Lacks active VOUT discharge - unsuitable where rapid rail collapse is required for functional safety. | Select when lowest possible IQ and tighter output tolerance are prioritized over shutdown behavior. |
| Analog Devices ADP160AUJZ-3.3-R7 | 150 mA max, 560 nA IQ, no discharge, 3.3V ±2%; stable with 0.47 µF ceramic. | Lower output current and higher IQ limit use to sub-100 mA systems; smaller footprint (TSOT-23-5). | Choose for space-constrained designs where 150 mA suffices and TSOT-23-5 layout is already established. |
Compared with XC6210B332MR-G and ADP160AUJZ-3.3-R7, the MCP1812AT-033/LT uniquely combines 300 mA delivery, 250 nA IQ, and guaranteed output discharge in a 3-pin SOT-23 - making it the only option among the three that satisfies simultaneous high-current, ultra-low-leakage, and controlled-shutdown requirements in single-cell battery systems.
Availability
MCP1812AT-033/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and industrial wireless transmitters requiring stable component supply with guaranteed 10+ year longevity and traceable sourcing.
Supply support for MCP1812AT-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 microcontroller, analog, FPGA, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1811/12 family was designed specifically for ultra-low-power, long-life battery applications - targeting energy harvesting, wearables, and medical devices where nanoscale quiescent current and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the MCP1812AT-033/LT?
The MCP1812AT-033/LT has an absolute maximum input voltage rating of +6.0V. However, its specified operating input range is 2.4V to 5.5V for full 300 mA output capability. Operation above 5.5V risks permanent damage and violates the device's qualified operating conditions per DS20006088C.
Does the MCP1812AT-033/LT require an input capacitor?
No, the MCP1812AT-033/LT is specified to achieve –50 dB PSRR at 1 kHz with no input capacitor. While a 1 µF ceramic capacitor on VIN is recommended for improved transient response and EMI suppression, it is not required for basic stability - unlike many legacy LDOs that mandate minimum ESR or CIN.
Is the MCP1812AT-033/LT pin-compatible with other variants in the MCP1812X family?
Yes - all MCP1812X variants (including MCP1812AT-033/LT, MCP1812BT-33/LT, and voltage-adjustable versions in same package) share identical 3-lead SOT-23 pinout: Pin 1 = VIN, Pin 2 = VOUT, Pin 3 = GND. No PCB redesign is needed when substituting between same-package variants.
What is the thermal resistance (θJA) of the MCP1812AT-033/LT in SOT-23?
The MCP1812AT-033/LT in 3-lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard layout practices - adding thermal vias under the GND pad can reduce θJA by ~20–30%.
How does the output discharge function behave during shutdown?
When SHDN is pulled low (≤20% VIN), the MCP1812AT-033/LT activates an internal discharge transistor (RDCH = 100 Ω typical) between VOUT and GND. This discharges a 2.2 µF output capacitor from 3.3V to <100 mV in <1 ms - ensuring fast, predictable rail collapse for system-level sequencing and safety compliance.
MCP1812AT-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
MCP1812AT-033/LT FAQ
1.How can I place an order for MCP1812AT-033/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-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 MCP1812AT-033/LT reliable?
The price and inventory of MCP1812AT-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 MCP1812AT-033/LT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-033/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-033/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-033/LT?
MCP1812AT-033/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-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 MCP1812AT-033/LT?
For technical support, including MCP1812AT-033/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-033/LT requirements.
6.How does Aetrix verify that MCP1812AT-033/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-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 MCP1812AT-033/LT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-033/LT?
All MCP1812AT-033/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-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 MCP1812AT-033/LT part is unused and in its original packaging.
Return procedure for MCP1812AT-033/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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