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Microchip Technology MCP1812AT-033/LB
- Part No.:
- MCP1812AT-033/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1812AT-033/LB.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,440
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Product details
Overview
MCP1812AT-033/LB from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 3.3V low-dropout linear regulator in a 4-lead 1×1 mm UDFN package with exposed thermal pad, designed for energy harvesting and long-life battery-powered systems requiring stable output under light-load and shutdown conditions.
For engineers reviewing the MCP1812AT-033/LB datasheet, MCP1812AT-033/LB pinout, MCP1812AT-033/LB application, or MCP1812AT-033/LB equivalent, this page delivers verified electrical specs, thermal performance data, shutdown behavior (5 nA typical), ceramic-capacitor stability (2.2 µF), and real-world use cases in wearable electronics and medical devices.
Technical Context
The MCP1812AT-033/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and high PSRR (–50 dB at 1 kHz) without external compensation. Its internal reference and error amplifier maintain ±4% output accuracy across –40°C to +85°C junction temperature.
It features active output discharge during shutdown (SHDN = GND), foldback current limiting (100 mA at RLOAD = 1 Ω), and operates stably with only 2.2 µF X7R ceramic output capacitance - eliminating need for bulk electrolytic capacitors and reducing board area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% - ensures compatibility with 3.3V logic families and microcontrollers without external feedback network. |
| Max Output Current | 300 mA continuous - supports higher-power peripherals (e.g., BLE radios, sensors) in compact battery-operated designs. |
| Quiescent Current | 250 nA typical - extends battery life in multi-year deployments (e.g., IoT node sleep cycles). |
| Shutdown Current | 5 nA typical (MCP1812B variant) - enables deep-sleep modes with negligible leakage impact on primary cell capacity. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to 3.7 V input (e.g., single Li-ion cell at end-of-discharge). |
| Stability Capacitance | 2.2 µF ceramic (X7R) - reduces BOM count and PCB footprint vs. tantalum/electrolytic alternatives. |
| PSRR | –50 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters in mixed-power-supply systems. |
Pinout & Package
Package: 4-Lead 1×1 mm UDFN with exposed thermal pad (EP), JEDEC-standard footprint optimized for thermal dissipation on 4-layer FR4 boards with thermal vias (θJA = 91.05°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.4 V to 5.5 V input; minimum VIN ≥ VOUT + VDROPOUT (≥3.7 V at full load) ensures regulation. |
| SHDN | Active-low enable control | Pulled high internally; driven low to enter 5 nA shutdown mode with output discharge enabled. |
| VOUT | Regulated output | Delivers stable 3.3 V; requires ≥2.2 µF X7R ceramic capacitor placed within 2 mm of pin for stability. |
| GND | Ground reference | Low-impedance return path; must connect directly to output capacitor ground and thermal pad for optimal PSRR and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in 10 µA average-current applications using CR2032 or coin cells. |
| Output discharge on shutdown | Drives VOUT to GND via internal 100 Ω transistor (RDCH), preventing floating outputs and ensuring clean system reset sequencing. |
| Ceramic-capacitor stability | Eliminates ESR requirements and simplifies layout - no need for series resistors or parallel capacitors to meet phase margin targets. |
| Foldback current limit | Reduces power dissipation during short-circuit events by lowering current to 100 mA (vs. 500 mA peak limit), protecting die and PCB traces. |
| Wide input range (2.4–5.5 V) | Supports direct connection to single-cell Li-ion (3.0–4.2 V), LiFePO4 (2.5–3.65 V), or dual alkaline (2.4–3.2 V) sources without pre-regulation. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by thin-film battery recharged via piezoelectric harvester. IC Role / Device Role / Timing Role: Primary 3.3V supply for ultra-low-power MCU and analog front-end, maintaining regulation during microsecond-scale load transients. Use Value: 250 nA quiescent current extends usable runtime between harvest events; 2.2 µF ceramic cap minimizes thickness for flexible PCB integration. |
Use Scenario: Wireless soil moisture sensor deployed in remote agriculture, powered by solar cell + supercapacitor buffer. IC Role / Device Role / Timing Role: Stable 3.3V rail for RF transceiver and ADC during burst transmission, surviving input voltage sag below 3.0 V. Use Value: 400 mV dropout enables operation down to 3.7 V input - maximizing energy extraction from low-voltage harvesters. |
| Hearing Aid Audio Processor | Smart Card Secure Element |
|
Use Scenario: Miniaturized hearing aid with digital signal processor and MEMS microphone, powered by zinc-air battery. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for audio codec and DSP, rejecting switching noise from Class-D receiver amplifier. Use Value: –50 dB PSRR at 1 kHz prevents audible switching artifacts; 1×1 mm UDFN fits tight form factor constraints. |
Use Scenario: Contactless payment card with embedded secure microcontroller and NFC interface, operating from induced RF field. IC Role / Device Role / Timing Role: Regulated 3.3V supply activated only during transaction, with rapid start-up (<400 µs) and zero-output leakage in standby. Use Value: 5 nA shutdown current prevents parasitic drain during idle; output discharge ensures deterministic power-down state for cryptographic operations. |
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; SOT-25 package (larger footprint, higher θJA = 211°C/W) | Lacks active VOUT discharge - unsuitable where controlled power-down sequencing is required. | Select when board space permits larger package and discharge functionality is unnecessary. |
| Ricoh RP114K331D-TR-F | 300 mA, 220 nA IQ, 3.3V fixed, SC-82AB package; no discharge, 600 mV dropout at 300 mA | Higher dropout limits usable input range - cannot regulate from 3.7 V input at full load. | Choose only if lower IQ is critical and input voltage remains ≥4.3 V under all operating conditions. |
Compared with XC6210B332MR-G and RP114K331D-TR-F, the MCP1812AT-033/LB uniquely combines output discharge, 400 mV dropout, and 1×1 mm UDFN packaging - enabling smaller, more robust power architectures in space-constrained, battery-sensitive designs.
Availability
MCP1812AT-033/LB is available at Aetrix Electronics and suitable for energy harvesting systems, wearable medical devices, and smart card applications requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for MCP1812AT-033/LB 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 MCP1812AT-033/LB belongs to Microchip's ultra-low-power LDO family, engineered specifically for battery longevity in intermittent-load applications such as wireless sensors, wearables, and secure authentication devices.
FAQ
What is the maximum input voltage rating for the MCP1812AT-033/LB?
The MCP1812AT-033/LB has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V violates the recommended operating conditions and may cause permanent damage. For reliable long-term use, VIN must remain within 2.4 V to 5.5 V per the datasheet's electrical specifications table.
Does the MCP1812AT-033/LB require an external pull-up resistor on the SHDN pin?
No - the MCP1812AT-033/LB includes an internal pull-up resistor on the SHDN pin. It defaults to active (regulated output) when left unconnected. An external pull-down is only needed to force shutdown; no external pull-up is required or recommended.
Can the MCP1812AT-033/LB operate with a 1 µF output capacitor?
No. The MCP1812AT-033/LB requires a minimum of 2.2 µF ceramic (X7R) output capacitance for stability, as confirmed in Table 1 and Section 4.2 of DS20006088C. Using 1 µF risks oscillation and output voltage instability, especially under dynamic load conditions.
Is the MCP1812AT-033/LB pin-compatible with other members of the MCP1811/12 family?
Yes - the MCP1812AT-033/LB uses the same 4-lead 1×1 mm UDFN package and pinout (VIN, SHDN, VOUT, GND) as all other MCP1812X variants in that package. However, output voltage and discharge capability differ across part numbers; verify VR and suffix (A/B) before substitution.
What thermal performance can be expected from the MCP1812AT-033/LB in a standard PCB layout?
On a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias, the MCP1812AT-033/LB achieves θJA = 91.05°C/W. At 300 mA load and 3.7 V input, power dissipation is ~120 mW, resulting in ~11°C junction-to-ambient rise - well within the –40°C to +85°C operating range.
MCP1812AT-033/LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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-70-3
MCP1812AT-033/LB FAQ
1.How can I place an order for MCP1812AT-033/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-033/LB 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/LB reliable?
The price and inventory of MCP1812AT-033/LB 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/LB is usually 5 days.
3.What payment methods are accepted for MCP1812AT-033/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-033/LB transactions.
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4.How is shipping managed for MCP1812AT-033/LB?
MCP1812AT-033/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-033/LB 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/LB?
For technical support, including MCP1812AT-033/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-033/LB requirements.
6.How does Aetrix verify that MCP1812AT-033/LB is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-033/LB 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/LB meets industry standards.
7.What is the process for return or replacement of MCP1812AT-033/LB?
All MCP1812AT-033/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-033/LB, 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/LB part is unused and in its original packaging.
Return procedure for MCP1812AT-033/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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