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Microchip Technology MCP1812AT-012/TT
- Part No.:
- MCP1812AT-012/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812AT-012/TT.pdf
- Description:
- IC REG LINEAR 1.2V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
MCP1812AT-012/TT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 1.2 V low-dropout linear regulator in a 3-lead SOT-23 package, designed for energy harvesting and long-life battery-powered systems requiring stable low-voltage supply under microampere load conditions.
For engineers reviewing the MCP1812AT-012/TT datasheet, MCP1812AT-012/TT pinout, MCP1812AT-012/TT application, or MCP1812AT-012/TT equivalent, this page delivers verified electrical specs, thermal performance data, shutdown behavior, ceramic-capacitor stability requirements, and real-world use cases in wearable and medical edge devices.
Technical Context
The MCP1812AT-012/TT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and stable regulation across 1.8–5.5 V input range. Its internal error amplifier and reference circuit maintain ±4% output accuracy over –40°C to +85°C junction temperature.
It features active output discharge during shutdown (SHDN = GND), 5 nA typical shutdown current (MCP1812B variant), and foldback current limiting (100 mA at RLOAD = 1 Ω). The device is optimized for operation with only 2.2 µF ceramic output capacitance and exhibits –50 dB PSRR at 1 kHz with no input capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for 1.2 V logic cores and ultra-low-power MCUs without external feedback. |
| Max Output Current | 300 mA - supports higher peak loads than 150 mA LDOs while maintaining ultra-low IQ, suitable for intermittent sensor bursts. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-dominated applications like smart tags and hearing aids. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to VIN = 1.6 V, critical for single-cell Li-ion or coin-cell systems near end-of-life. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with wide-range energy harvesters (e.g., solar, RF, thermal) and legacy 3.3/5 V rails. |
| Output Capacitance | 2.2 µF ceramic (X7R) - enables compact, low-noise, cost-effective filtering without tantalum or electrolytic components. |
| Shutdown Current | 5 nA typical - reduces system standby power to negligible levels, essential for duty-cycled IoT endpoints. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AB), 2.92 mm × 1.6 mm × 1.1 mm, surface-mount, lead-free and RoHS compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass; connects directly to source of PMOS pass device. |
| 2 (GND) | Ground reference | Low-impedance return path for ground current only; must tie to quiet ground plane or output capacitor cathode for optimal PSRR. |
| 3 (VOUT) | Regulated output | Delivers stable 1.2 V; requires ≥2.2 µF X7R ceramic capacitor; sensitive to ESR and layout parasitics for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical - extends shelf life and operational runtime in battery-backed memory and RTC circuits. |
| Output discharge on shutdown | Active NMOS discharge switch (RDCH = 100 Ω typical) - prevents residual voltage hold-up that could delay system reset or cause leakage paths. |
| Ceramic-capacitor stability | Stable with ≥2.2 µF X7R ceramic only - eliminates need for high-ESR tantalum, reducing BOM count and board area. |
| Foldback current limit | 100 mA short-circuit current - limits power dissipation during fault, enabling safe operation without external current sense. |
| Wide temperature range | –40°C to +85°C operating junction - validated for wearable electronics exposed to body heat and ambient environmental swings. |
Applications
| Energy Harvesting Node | Smart Hearing Aid |
|---|---|
|
Use Scenario: Indoor light-harvesting sensor node powering BLE MCU and analog front-end from amorphous silicon cell. IC Role / Device Role / Timing Role: Primary 1.2 V supply for MCU core and ADC reference, activated only during wake-up intervals. Use Value: 250 nA quiescent current enables >5-year battery life using CR2032; 300 mA peak supports concurrent radio + sensor sampling. |
Use Scenario: Miniaturized rechargeable hearing aid with real-time audio processing and Bluetooth LE streaming. IC Role / Device Role / Timing Role: Main LDO supplying 1.2 V to DSP core and MEMS microphone bias circuitry. Use Value: 400 mV dropout preserves usable voltage window from 1.8 V Li-ion cell; 5 nA shutdown minimizes self-discharge during storage. |
| Medical Wearable Patch | Ultra-Low-Power Smart Card |
|
Use Scenario: Disposable ECG patch with 30-day continuous monitoring powered by thin-film battery. IC Role / Device Role / Timing Role: Regulated 1.2 V rail for ultra-low-power ARM Cortex-M0+ and analog signal chain. Use Value: Stable 1.2 V output with ±4% tolerance ensures consistent ADC LSB size; 2.2 µF ceramic support simplifies flex PCB layout. |
Use Scenario: Contactless payment card with embedded secure element and NFC interface operating from harvested RF field. IC Role / Device Role / Timing Role: On-demand 1.2 V supply generated during NFC polling burst, shut down between transactions. Use Value: 5 nA shutdown current prevents drain during idle; fast 400 µs startup (TDELAY) ensures responsive transaction handshaking. |
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 output, 1 µA IQ, no output discharge, SOT-23-3 | Lacks active discharge and lower IQ; suitable where shutdown leakage is less critical | Select when 1 µA IQ is acceptable and output discharge is unnecessary; verify 200 mA load margin. |
| Ricoh RP111N121D-TR-F | 1.2 V fixed, 300 mA output, 350 nA IQ, no output discharge, SOT-23-3 | Higher IQ (350 nA vs. 250 nA), no discharge, same package and current rating | Choose if Microchip's discharge function is not required and 100 nA IQ penalty is tolerable for sourcing simplicity. |
Compared with MCP1812AT-012/TT, the XC6210B122MR-G offers lower cost but sacrifices 75% IQ advantage and discharge capability, while the RP111N121D-TR-F matches current rating but increases quiescent draw by 40%, impacting multi-year battery life in deep-sleep systems.
Availability
MCP1812AT-012/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical patches, and smart card designs requiring stable component supply with guaranteed long-term manufacturability and traceable lot control.
Supply support for MCP1812AT-012/TT 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 microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software platforms.
The MCP181X/12X family was engineered specifically for ultra-low-power, long-life battery and energy-harvesting applications-prioritizing nanoscale quiescent current, ceramic-capacitor compatibility, and minimal footprint without compromising output stability or transient response.
FAQ
What is the maximum input voltage rating for MCP1812AT-012/TT?
The absolute maximum input voltage for MCP1812AT-012/TT is +6.0 V. However, the recommended operating input range is 1.8 V to 5.5 V per the datasheet. Exceeding 5.5 V may trigger internal protection or degrade reliability; sustained operation above 6.0 V risks permanent damage. Always include input transient suppression if used in noisy environments.
Does MCP1812AT-012/TT require an external shutdown resistor?
No, MCP1812AT-012/TT does not require an external pull-up resistor on the SHDN pin. Its shutdown input has built-in hysteresis and logic thresholds (VSHDN-HIGH ≥ 70% VIN, VSHDN-LOW ≤ 20% VIN); it operates correctly with direct GPIO control. A 1 MΩ pull-up is shown in typical application schematics only for demonstration-not a design requirement.
Can MCP1812AT-012/TT be used with a 1 µF output capacitor?
No. MCP1812AT-012/TT requires a minimum of 2.2 µF X7R ceramic output capacitor for stability, as confirmed in Table 1 and Section 4.2 of DS20006088C. Using 1 µF violates the stability condition and may cause oscillation or poor load transient response. The 1 µF value applies only to the 150 mA MCP1811X series.
Is MCP1812AT-012/TT pin-compatible with other variants in the MCP1812X family?
Yes-MCP1812AT-012/TT shares identical 3-lead SOT-23 pinout and footprint with all MCP1812X variants (e.g., MCP1812AT-182/TT, MCP1812BT-012/TT). Voltage and shutdown variants differ only in internal trimming and mask ROM; mechanical and electrical pin functions (VIN/GND/VOUT) remain fully interchangeable.
What thermal performance can be expected from MCP1812AT-012/TT in a standard 4-layer PCB?
On a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias, MCP1812AT-012/TT (in SOT-23) has θJA = 211.33°C/W. At 300 mA output into 1.2 V load (360 mW dissipation), junction rise above ambient is ~76°C - well within the +85°C max operating TJ if ambient stays below +9°C. For higher ambient, derating or enhanced copper pours are advised.
MCP1812AT-012/TT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
MCP1812AT-012/TT FAQ
1.How can I place an order for MCP1812AT-012/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-012/TT 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/TT reliable?
The price and inventory of MCP1812AT-012/TT 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/TT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-012/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-012/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-012/TT?
MCP1812AT-012/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-012/TT 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/TT?
For technical support, including MCP1812AT-012/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-012/TT requirements.
6.How does Aetrix verify that MCP1812AT-012/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-012/TT 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/TT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-012/TT?
All MCP1812AT-012/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-012/TT, 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/TT part is unused and in its original packaging.
Return procedure for MCP1812AT-012/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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