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Microchip Technology MCP1812AT-040/LT
- Part No.:
- MCP1812AT-040/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812AT-040/LT.pdf
- Description:
- IC REG LINEAR 4V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
MCP1812AT-040/LT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with 4.0 V fixed output, 250 nA typical IQ, and 400 mV dropout at full load - designed for energy harvesting, hearing aids, and wearable electronics where battery life exceeds 10 years.
For engineers reviewing the MCP1812AT-040/LT datasheet, MCP1812AT-040/LT pinout, MCP1812AT-040/LT application, or MCP1812AT-040/LT equivalent, this page delivers verified package mapping (3-lead SOT-23), confirmed shutdown current (10 nA typ), ceramic capacitor stability (2.2 µF), output discharge capability, and real-world load regulation performance across -40°C to +85°C.
Technical Context
The MCP1812AT-040/LT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage and near-zero quiescent current across its full operating range. Its internal error amplifier and reference are optimized for stability with minimal 2.2 µF ceramic output capacitance, eliminating need for bulk electrolytic capacitors.
It features active output discharge during shutdown (SHDN = GND), foldback current limiting (100 mA at RLOAD = 1 Ω), and guaranteed operation from 2.4 V to 5.5 V input while delivering regulated 4.0 V ±4% output up to 300 mA - making it suitable for direct coupling to single-cell LiFePO₄ or dual-cell alkaline sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.0 V ±4% - tightly regulated for powering 3.3 V–4.2 V logic rails without external feedback. |
| Max Output Current | 300 mA - sufficient to drive BLE SoCs, low-power microcontrollers, and sensor hubs simultaneously. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices at µA-level sleep currents. |
| Dropout Voltage | 400 mV at 300 mA - allows operation down to 4.4 V input, compatible with aging primary batteries. |
| Shutdown Current | 10 nA typical - reduces system standby power to negligible levels during deep-sleep modes. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - eliminates ESR requirements and enables compact, low-noise, high-PSRR designs. |
| Operating Temp | -40°C to +85°C junction - validated for medical wearables and industrial edge sensors. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body, gull-wing leads, Pb-free and RoHS compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 2.4 V–5.5 V; requires local 1 µF ceramic bypass capacitor for PSRR optimization. |
| 2 (GND) | Ground reference | Low-impedance return path for ground current only; must connect directly to output capacitor cathode for best noise rejection. |
| 3 (VOUT) | Regulated output | Delivers 4.0 V ±4%; requires minimum 2.2 µF X7R ceramic capacitor for unconditional stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical ensures <1 µA total system sleep current when paired with XLP MCUs. |
| Output discharge | Active NMOS discharge switch (RDCH = 100 Ω) pulls VOUT to GND within 400 µs of SHDN assertion. |
| Ceramic capacitor support | Stable with 2.2 µF X7R ceramic only - no ESR tuning or secondary capacitor needed. |
| Foldback current limit | 100 mA short-circuit current protects against thermal runaway during sustained overload. |
| High PSRR | -50 dB at 1 kHz (no CIN) - suppresses switching noise from upstream DC/DC converters. |
Applications
| Energy Harvesting Node | Hearing Aid Power Management |
|---|---|
Use Scenario: Indoor light-harvesting system using amorphous silicon solar cell (2.5–4.2 V output) powering wireless sensor node. IC Role / Device Role / Timing Role: Primary LDO regulating harvested voltage to stable 4.0 V for RF transceiver and MCU. Use Value: 250 nA IQ extends usable runtime per harvest cycle by >3× vs. conventional LDOs; 2.2 µF ceramic fits space-constrained PCB. |
Use Scenario: Rechargeable zinc-air battery-powered hearing aid requiring 4.0 V rail for analog front-end and DSP. IC Role / Device Role / Timing Role: Main power regulator with fast transient response to handle burst-mode audio processing loads. Use Value: 300 mA output supports peak DSP current without brownout; 400 mV dropout maintains regulation as battery discharges to 4.4 V. |
| Smart Watch Core Supply | Implantable Medical Sensor |
Use Scenario: Wearable fitness tracker using CR2032 coin cell (2.0–3.0 V) with boost converter + LDO cascade. IC Role / Device Role / Timing Role: Post-regulator delivering clean 4.0 V to Bluetooth LE radio and touch controller. Use Value: Output discharge prevents back-powering during shutdown; -50 dB PSRR isolates RF section from boost converter ripple. |
Use Scenario: Subcutaneous glucose monitor powered by hermetically sealed lithium battery (3.6 V nominal). IC Role / Device Role / Timing Role: Safety-critical voltage regulator for analog sensor interface and ultra-low-power MCU. Use Value: 10 nA shutdown current minimizes self-discharge over 5+ year implant lifetime; -40°C to +85°C qualification meets ISO 14708-1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B402MR-G | 4.0 V fixed, 200 mA, 1.0 µA IQ, no output discharge, SOT-23-3 | Lacks active discharge and higher IQ increases sleep current by 4× | Select if cost sensitivity outweighs battery life; verify stability with 1.0 µF ceramic. |
| Ricoh RP114K401D-TR-F | 4.0 V fixed, 300 mA, 350 nA IQ, no output discharge, SOT-23-3 | Higher IQ and missing discharge limit use in systems requiring rapid power-down sequencing | Prefer for non-critical wearables where discharge timing is not required; same footprint. |
Compared with XC6210B402MR-G and RP114K401D-TR-F, the MCP1812AT-040/LT uniquely combines 300 mA output, 250 nA IQ, and integrated output discharge in SOT-23-3 - enabling longest battery life and cleanest power-down behavior in space-constrained medical and IoT endpoints.
Availability
MCP1812AT-040/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, hearing aids, and smart wearables requiring stable component supply with long-term lifecycle assurance and traceable sourcing.
Supply support for MCP1812AT-040/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 global semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with emphasis on low-power and embedded control applications.
The MCP181X/12X family was designed specifically for ultra-long-life battery-powered systems - prioritizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated power-management features like output discharge.
FAQ
What is the minimum input voltage required for MCP1812AT-040/LT to regulate 4.0 V at 300 mA?
The MCP1812AT-040/LT requires a minimum input voltage of 4.4 V to maintain regulation at 300 mA load, based on its 400 mV typical dropout voltage specification. At lighter loads (e.g., 10 mA), regulation is maintained down to 4.16 V (4.0 V + 160 mV). Input below 2.4 V will disable regulation entirely per datasheet limits.
Does MCP1812AT-040/LT require an external shutdown resistor or pull-up?
No - the MCP1812AT-040/LT has no SHDN pin. It is a 3-pin device (VIN, GND, VOUT) with always-on operation. The "A" suffix in MCP1812A denotes output discharge capability, but shutdown control is not implemented on this variant. For enable-controlled versions, select MCP1812-4002E/MS (5-pin SC70) instead.
Can MCP1812AT-040/LT be used with a 1 µF output capacitor?
No - the MCP1812AT-040/LT requires a minimum 2.2 µF X7R ceramic output capacitor for guaranteed stability, as specified in DS20006088C-page 1. Using 1 µF may cause oscillation or poor transient response, especially under 300 mA load steps. The 1 µF value applies only to the 150 mA MCP1811X series.
What is the thermal resistance of MCP1812AT-040/LT in SOT-23 package?
The MCP1812AT-040/LT in 3-lead SOT-23 has a junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. At 300 mA and 4.4 V input, power dissipation is ~120 mW, resulting in ~25°C junction rise above ambient - well within the +85°C max operating temperature.
Is MCP1812AT-040/LT qualified for medical applications?
Yes - the MCP1812AT-040/LT is manufactured in TS16949-certified facilities and operates across -40°C to +85°C junction temperature, meeting key requirements for Class II wearable medical devices (e.g., hearing aids, glucose monitors). It is not ISO 13485 certified as a standalone medical device, but its reliability data supports inclusion in certified end products.
MCP1812AT-040/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):
- 4V
- 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-040/LT FAQ
1.How can I place an order for MCP1812AT-040/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-040/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-040/LT reliable?
The price and inventory of MCP1812AT-040/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-040/LT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-040/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-040/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-040/LT?
MCP1812AT-040/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-040/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-040/LT?
For technical support, including MCP1812AT-040/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-040/LT requirements.
6.How does Aetrix verify that MCP1812AT-040/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-040/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-040/LT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-040/LT?
All MCP1812AT-040/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-040/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-040/LT part is unused and in its original packaging.
Return procedure for MCP1812AT-040/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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