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Microchip Technology MCP1812AT-012/LT
- Part No.:
- MCP1812AT-012/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812AT-012/LT.pdf
- Description:
- IC REG LINEAR 1.2V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,584
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Product details
Overview
MCP1812AT-012/LT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 1.2 V output, 250 nA typical operating current, and output discharge functionality (MCP1812A variant). It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors ≥2.2 µF, and targets battery-powered systems requiring long runtime and stable low-voltage rail generation - such as wearable medical sensors and energy-harvesting nodes.
For engineers reviewing the MCP1812AT-012/LT datasheet, MCP1812AT-012/LT pinout, MCP1812AT-012/LT application, or MCP1812AT-012/LT equivalent, this page delivers verified electrical specs, package mapping, functional role in ultra-low-power systems, and validated alternative options for design-in continuity and supply resilience.
Technical Context
The MCP1812AT-012/LT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and inherent reverse-current blocking. Its internal error amplifier maintains ±4% output accuracy over load (0–300 mA), temperature (−40°C to +85°C), and line (VIN ≥2.4 V) variations.
It integrates an active-shutdown control path with 10 nA typical shutdown current and a dedicated discharge transistor (RDCH = 100 Ω) that actively pulls VOUT to GND when SHDN = GND - eliminating residual voltage hold-up during sleep transitions in energy-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - enables direct powering of ultra-low-voltage MCUs (e.g., PIC XLP, ARM Cortex-M0+) without external feedback. |
| Max Output Current | 300 mA continuous - supports higher-current peripherals (e.g., BLE radios, ADCs) while maintaining microamp-level quiescent draw. |
| Quiescent Current | 250 nA typical (active), 10 nA typical (shutdown) - extends coin-cell life beyond 10 years in duty-cycled sensor nodes. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting sources (e.g., solar, thermal). |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM count and board area vs. tantalum; enables low-noise operation (<223 µVrms @ 10 Hz–100 kHz). |
| Dropout Voltage | 400 mV typical at 300 mA - allows regulation down to VIN = 1.6 V under full load, maximizing usable battery capacity. |
| PSRR | −50 dB @ 1 kHz (no CIN) - suppresses switching noise from upstream DC/DC converters without requiring large input filtering. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), RoHS-compliant, moisture sensitivity level 1 (MSL1). Thermal resistance θJA = 211.33°C/W on JEDEC 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin to ensure stability and PSRR performance. |
| VOUT | Regulated output | Delivers fixed 1.2 V; requires ≥2.2 µF ceramic output capacitor tied directly to GND for loop stability and transient response. |
| GND | Ground reference | Low-impedance return path for load and quiescent current; connect to quiet ground plane or output capacitor cathode to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical ensures >10-year battery life in 1-µA average-current IoT endpoints (e.g., environmental sensors). |
| Active output discharge | 100 Ω internal discharge FET pulls VOUT to GND within microseconds of SHDN assertion - prevents backfeeding and enables fast system reset. |
| Ceramic-capacitor stability | Validated with 2.2 µF X7R MLCC only - eliminates need for ESR-tuned tantalum, reducing cost, size, and aging-related drift. |
| Wide input range | 1.8–5.5 V operation supports direct connection to harvested energy sources (e.g., 2.2 V thermoelectric generators) without pre-regulation. |
| Overcurrent protection | Foldback current limit (100 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events without latch-up. |
Applications
| Wearable Medical Sensors | Energy-Harvesting Edge Nodes |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) using coin-cell battery and sub-1-V analog front-end. IC Role / Device Role / Timing Role: Primary 1.2 V power rail for ultra-low-power MCU and analog signal chain. Use Value: 250 nA quiescent current extends 3 V CR2032 life to >7 years at 10-second sampling intervals. |
Use Scenario: Wireless soil moisture sensor powered by miniature solar harvester (2.0–4.5 V output). IC Role / Device Role / Timing Role: Stable 1.2 V supply for RF transceiver and precision ADC during intermittent wake cycles. Use Value: 1.8 V minimum input enables regulation down to dawn/dusk light levels; 10 nA shutdown minimizes dark-current loss. |
| Smart Card Readers | Hearing Aid Signal Processors |
|
Use Scenario: Contactless smart card reader in portable payment terminal with standby timeout. IC Role / Device Role / Timing Role: Always-on 1.2 V rail for secure element and NFC controller during deep-sleep mode. Use Value: Output discharge clears residual charge before reactivation, preventing protocol handshake failures after wake-up. |
Use Scenario: Rechargeable hearing aid with zinc-air battery and real-time audio DSP. IC Role / Device Role / Timing Role: Low-noise 1.2 V supply for 24-bit audio ADC and digital filter core. Use Value: <223 µVrms integrated noise and −50 dB PSRR suppress switching artifacts from charging IC, preserving SNR >105 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B122MR-G | 1.2 V fixed, 200 mA max, 250 nA IQ, no output discharge, SOT-23-3 | Lacks active VOUT discharge; unsuitable where rapid rail collapse is required for system sequencing. | Select when output discharge is unnecessary and 200 mA load ceiling is sufficient. |
| Ricoh RP114K121D-TR-F | 1.2 V fixed, 300 mA max, 300 nA IQ, 15 nA shutdown, no discharge, SOT-23-5 | 5-pin package adds enable logic flexibility but requires PCB redesign; no discharge function. | Choose for designs needing independent EN control or tighter layout constraints where 5-pin footprint is acceptable. |
Compared with XC6210B122MR-G and RP114K121D-TR-F, the MCP1812AT-012/LT uniquely combines 300 mA capability, 10 nA shutdown, and integrated output discharge in a 3-pin SOT-23 - enabling simpler, more reliable power sequencing in space- and energy-constrained edge devices.
Availability
MCP1812AT-012/LT is available at Aetrix Electronics and suitable for wearable electronics, medical sensing, and energy-harvesting applications requiring stable component supply across multi-year production cycles.
Supply support for MCP1812AT-012/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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1812AT-012/LT belongs to Microchip's ultra-low-IQ LDO family designed specifically for battery- and energy-harvesting-powered systems where multi-year operational life and minimal sleep-mode leakage are critical design requirements.
FAQ
What is the maximum input voltage rating for the MCP1812AT-012/LT?
The MCP1812AT-012/LT has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V is not recommended per datasheet specifications. For sustained reliability, keep VIN ≤5.5 V under all conditions including transients - exceeding this may cause permanent damage or accelerated parametric shift.
Does the MCP1812AT-012/LT require an external pull-up resistor on the SHDN pin?
Yes - the MCP1812AT-012/LT SHDN pin is active-low and internally uncommitted. A 1 MΩ pull-up to VIN is specified in the datasheet for reliable startup and noise immunity. Omitting it risks undefined startup behavior or spurious shutdown due to floating input.
Can the MCP1812AT-012/LT operate with a 1 µF output capacitor?
No - the MCP1812AT-012/LT requires a minimum 2.2 µF ceramic (X7R) output capacitor for guaranteed stability. Using 1 µF may cause oscillation or poor transient response, especially at full 300 mA load. The 2.2 µF value is validated across temperature and process corners.
Is the MCP1812AT-012/LT pin-compatible with other variants in the MCP1812X family?
Yes - all MCP1812X variants (e.g., MCP1812AT-182/LT, MCP1812AT-332/LT) share identical 3-pin SOT-23 pinout (VIN, VOUT, GND). Only the output voltage and internal feedback network differ; no PCB change is needed when swapping fixed-voltage versions.
What is the thermal performance of the MCP1812AT-012/LT in SOT-23 package?
In the 3-Lead SOT-23 package, the MCP1812AT-012/LT has a junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board. At 300 mA and 1.2 V output, power dissipation is ~1.14 W max - limiting ambient temperature to ≤65°C for safe operation below +85°C junction limit.
MCP1812AT-012/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):
- 1.2V
- 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-012/LT FAQ
1.How can I place an order for MCP1812AT-012/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-012/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-012/LT reliable?
The price and inventory of MCP1812AT-012/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-012/LT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-012/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-012/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-012/LT?
MCP1812AT-012/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-012/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-012/LT?
For technical support, including MCP1812AT-012/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-012/LT requirements.
6.How does Aetrix verify that MCP1812AT-012/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-012/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-012/LT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-012/LT?
All MCP1812AT-012/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-012/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-012/LT part is unused and in its original packaging.
Return procedure for MCP1812AT-012/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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