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Microchip Technology MCP1812AT-030/LT
- Part No.:
- MCP1812AT-030/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812AT-030/LT.pdf
- Description:
- IC REG LINEAR 3V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,854
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Product details
Overview
MCP1812AT-030/LT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 3.0V output, 250 nA typical IQ, and shutdown capability (10 nA typical ISHDN). It operates from 1.8V to 5.5V input and is stable with a 2.2 µF ceramic output capacitor. Designed for energy harvesting and long-life battery-powered systems such as wearable medical sensors and smart cards.
For engineers reviewing the MCP1812AT-030/LT datasheet, MCP1812AT-030/LT pinout, MCP1812AT-030/LT application, or MCP1812AT-030/LT equivalent, this page delivers verified electrical specs, package mapping, thermal performance data, functional role in low-power sleep/wake architectures, and validated alternative options for design continuity.
Technical Context
The MCP1812AT-030/LT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and near-zero load-dependent quiescent current variation. Its internal error amplifier and reference are optimized for stability with minimal 2.2 µF ceramic output capacitance across –40°C to +85°C junction temperature.
It features active output discharge during shutdown (MCP1812A variant), overcurrent foldback protection (100 mA typical at RLOAD = 1 Ω), and precise line/load regulation (±20 mV and ±50 mV respectively) - critical for maintaining rail integrity in intermittent-power IoT nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±4% - ensures compatibility with 3.3V-tolerant I/O logic while allowing margin for brown-out detection. |
| Max Output Current | 300 mA continuous - supports higher peak loads than 150 mA variants (e.g., MCU burst transmission, sensor actuation). |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load applications (e.g., coin-cell-powered BLE beacons). |
| Shutdown Current | 10 nA typical - reduces standby power by >99% vs. active mode, essential for energy-harvesting storage management. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to 3.4V input when regulating 3.0V, maximizing usable battery voltage range. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - eliminates need for bulky tantalum/Al-elec, reducing PCB area and cost in space-constrained wearables. |
| PSRR | –50 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters without additional filtering. |
Pinout & Package
Package: 3-Lead SOT-23 - compact 2.92 mm × 1.3 mm footprint with exposed pad option (LT suffix denotes lead-free, RoHS-compliant SOT-23 variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8V–5.5V; requires local 1 µF ceramic bypass capacitor to minimize high-frequency noise injection. |
| VOUT | Regulated output | Delivers stable 3.0V; must connect ≥2.2 µF X7R ceramic capacitor directly between VOUT and GND for loop stability. |
| GND | Ground reference | Low-impedance return path for both load and ground current; tie to quiet ground plane or output capacitor ground node. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables multi-year operation on single CR2032 cell in devices drawing <1 µA average current (e.g., environmental loggers). |
| Output discharge on shutdown | Active pull-down via internal transistor (RDCH = 100 Ω typical) clears VOUT rapidly - prevents back-powering of upstream circuitry. |
| Thermal shutdown & foldback current limit | Protects against sustained overload or ambient overheating; foldback reduces power dissipation during short-circuit events. |
| Stable with ceramic capacitors only | Eliminates ESR requirements and aging concerns of electrolytic/tantalum caps - improves long-term reliability in medical wearables. |
| Wide input range (1.8V–5.5V) | Supports direct regulation from Li-ion, Li-SOCl₂, alkaline, or energy-harvesting sources without pre-regulation stage. |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
|
Use Scenario: Indoor light or thermal energy harvester powers a low-duty-cycle environmental monitor. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 3.0V to microcontroller and analog sensor during brief wake cycles. Use Value: 250 nA quiescent current minimizes leakage loss during >99.9% sleep time; 2.2 µF ceramic cap fits tight form factor. |
Use Scenario: Hearing aid with rechargeable micro-battery and real-time audio processing. IC Role / Device Role / Timing Role: Main power rail regulator for DSP and RF transceiver, enabling fast wake-from-shutdown response. Use Value: 10 nA shutdown current extends standby time; 300 mA output supports burst-mode wireless streaming. |
| Smart Card Interface | Industrial Wireless Sensor |
|
Use Scenario: Contactless payment card with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: Low-noise 3.0V supply for cryptographic IC and RF front-end during field-powered operation. Use Value: –50 dB PSRR at 1 kHz rejects NFC carrier harmonics; small SOT-23 footprint fits thin card profile. |
Use Scenario: Battery-powered vibration sensor in predictive maintenance system with LoRaWAN uplink. IC Role / Device Role / Timing Role: Power source for MEMS accelerometer, MCU, and sub-GHz transceiver during periodic sampling. Use Value: 400 mV dropout enables full utilization of 3.6V Li-SOCl₂ cell; thermal shutdown prevents failure in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-3002E/MB | Same 3.0V output, 300 mA rating, and 250 nA IQ, but in 4-lead 1×1 mm UDFN with exposed thermal pad. | Higher power density and better thermal resistance (θJA = 91°C/W vs. 211°C/W for SOT-23) - preferred for thermally constrained layouts. | Select when board space is limited and junction temperature rise must be minimized under 300 mA load. |
| TPL7407LPGEDR | 300 mA, 3.0V, 2.5 µA IQ (higher than MCP1812AT-030/LT), no output discharge, 6-pin SOT-23. | Lacks shutdown discharge and has 10× higher quiescent current - unsuitable for energy harvesting but offers higher PSRR (–65 dB @ 1 kHz). | Choose only if ultra-low IQ is not required and superior ripple rejection is prioritized over battery life. |
Compared with MCP1812AT-030/LT, the UDFN variant improves thermal performance for sustained loads, while the TPL7407LPGEDR trades off quiescent current for enhanced noise immunity - making MCP1812AT-030/LT optimal for multi-year battery operation where every nanoamp counts.
Availability
MCP1812AT-030/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card interfaces requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1812AT-030/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 is a leading provider of microcontrollers, analog components, and power management ICs, serving automotive, industrial, and consumer markets since 1989.
The MCP1811/12 family targets ultra-low-power systems where battery longevity and minimal bill-of-materials are critical - specifically engineered for energy-constrained edge devices like wearables and wireless sensors.
FAQ
What is the maximum input voltage rating for the MCP1812AT-030/LT?
The MCP1812AT-030/LT has an absolute maximum input voltage of +6.0V. Operation beyond this risks permanent damage. For reliable long-term use, the recommended operating input range is 1.8V to 5.5V, with minimum VIN dependent on load: ≥2.4V at 300 mA to maintain regulation.
Does the MCP1812AT-030/LT require an external shutdown pull-up resistor?
Yes - the SHDN pin is not internally biased. A 1 MΩ pull-up resistor to VIN is specified in the datasheet for proper startup. Without it, the device remains in shutdown mode. The MCP1812AT-030/LT draws only 10 nA in shutdown, so the resistor adds negligible leakage.
Can the MCP1812AT-030/LT be used with a 1 µF output capacitor?
No - the MCP1812AT-030/LT requires a minimum of 2.2 µF ceramic (X7R) output capacitance for stability. Using 1 µF (suitable for MCP1811X) risks oscillation and output voltage overshoot. The 2.2 µF value is validated across temperature and load conditions per DS20006088C.
What is the thermal resistance (θJA) of the MCP1812AT-030/LT in its SOT-23 package?
The MCP1812AT-030/LT in 3-lead SOT-23 has a thermal resistance of θJA = 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 exposed pad (if present) is not applicable to the /LT SOT-23 variant.
Is output discharge functionality present in the MCP1812AT-030/LT?
Yes - the 'A' suffix in MCP1812AT-030/LT confirms it is the output-discharge variant (MCP1812A). When SHDN is pulled low, an internal discharge transistor (RDCH = 100 Ω typical) actively pulls VOUT to GND, clearing residual charge faster than passive RC decay alone.
MCP1812AT-030/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):
- 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-030/LT FAQ
1.How can I place an order for MCP1812AT-030/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-030/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-030/LT reliable?
The price and inventory of MCP1812AT-030/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-030/LT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-030/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-030/LT transactions.
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4.How is shipping managed for MCP1812AT-030/LT?
MCP1812AT-030/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-030/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-030/LT?
For technical support, including MCP1812AT-030/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-030/LT requirements.
6.How does Aetrix verify that MCP1812AT-030/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-030/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-030/LT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-030/LT?
All MCP1812AT-030/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-030/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-030/LT part is unused and in its original packaging.
Return procedure for MCP1812AT-030/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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