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Microchip Technology MCP1812AT-025/TT
- Part No.:
- MCP1812AT-025/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812AT-025/TT.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,424
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Product details
Overview
MCP1812AT-025/TT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 2.5 V low-dropout linear regulator in 3-lead SOT-23 package, designed for energy harvesting and long-life battery-powered systems requiring stable low-noise voltage regulation with ceramic output capacitance as low as 2.2 µF.
For engineers reviewing the MCP1812AT-025/TT datasheet, MCP1812AT-025/TT pinout, MCP1812AT-025/TT application, or MCP1812AT-025/TT equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in wearable and medical electronics, and validated alternative parts with documented functional and application-level differences.
Technical Context
The MCP1812AT-025/TT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400–600 mV at 300 mA) and stable operation across 1.8–5.5 V input range. Its internal error amplifier and feedback network maintain ±4% output voltage accuracy over load (0–300 mA), temperature (–40°C to +85°C), and line variations.
It integrates active shutdown control (SHDN pin), output discharge during shutdown (MCP1812A variant), foldback current limiting (100 mA at RLOAD = 1 Ω), and PSRR of –50 dB at 1 kHz - all optimized for micro-power systems where sleep-mode current draw and transient response are critical design constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% - ensures compatibility with 2.5 V logic and analog rails without external resistors. |
| Max Output Current | 300 mA continuous - supports higher-current peripherals (e.g., BLE radios, sensors) in compact battery systems. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or harvested energy sources. |
| Dropout Voltage | 400–600 mV at 300 mA - allows regulation down to VIN = 2.9 V while maintaining 2.5 V output. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting sources. |
| Output Capacitance | 2.2 µF ceramic (X7R) minimum - reduces BOM count and board area vs. electrolytic solutions. |
| Shutdown Current | 10 nA typical (MCP1812A) - enables true zero-power standby when SHDN = GND. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm, surface-mount, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin for stability. |
| VOUT | Regulated output | Delivers fixed 2.5 V; requires ≥2.2 µF X7R ceramic capacitor to ground for loop stability and noise suppression. |
| GND | Ground reference | Low-impedance return path for load and regulator ground current; tie directly to quiet ground plane or output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Extends battery life in intermittent-sensing applications (e.g., environmental monitors) by minimizing sleep-mode drain. |
| Output discharge on shutdown | Drains VOUT to GND via internal 100 Ω switch when SHDN = GND - prevents residual voltage from powering downstream circuitry. |
| Ceramic-capacitor stability | Eliminates need for ESR-tuned tantalum or aluminum electrolytics - improves reliability and reduces footprint. |
| Foldback current limit | Reduces thermal stress during short-circuit events by lowering current to ~100 mA at 1 Ω load - protects IC and PCB traces. |
| PSRR: –50 dB @ 1 kHz | Rejects ripple from noisy switching supplies or shared input rails - preserves signal integrity in mixed-signal sensor nodes. |
Applications
| Energy Harvesting Node | Wearable Health Monitor |
|---|---|
|
Use Scenario: Powering ultra-low-power MCU and RF transceiver from thermoelectric or piezoelectric harvester with <50 µW average output. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 2.5 V to enable sub-µA deep-sleep modes and fast wake-up response. Use Value: 250 nA quiescent current ensures >95% of harvested energy reaches the load; 2.2 µF ceramic cap minimizes harvester interface complexity. |
Use Scenario: Supplying ECG front-end amplifier and Bluetooth LE SoC in wrist-worn biosensor operating 3+ years on CR2032. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO isolating analog sensing path from digital switching noise. Use Value: –50 dB PSRR at 1 kHz suppresses digital switching artifacts; ±4% output tolerance maintains ADC reference accuracy. |
| Hearing Aid Audio Subsystem | Smart Card Secure Element |
|
Use Scenario: Regulating power to MEMS microphone preamp and Class-D receiver driver in miniaturized hearing aid. IC Role / Device Role / Timing Role: Low-noise 2.5 V source with fast load-transient response (<400 µs start-up) for real-time audio processing. Use Value: 169 µVrms output noise (10 Hz–100 kHz) preserves SNR in audio chain; 300 mA capability handles peak speaker drive. |
Use Scenario: Providing secure 2.5 V rail to cryptographic co-processor in contactless smart card during NFC field coupling. IC Role / Device Role / Timing Role: Fast-starting, low-IQ regulator that powers up within 400 µs after field detection to meet ISO/IEC 14443 timing windows. Use Value: 10 nA shutdown current eliminates leakage during idle; 2.2 µF ceramic cap fits constrained card laminate stack-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B252MR-G | 250 nA IQ, 200 mA output, same 2.5 V fixed output, but no output discharge function. | Lacks VOUT discharge during shutdown - unsuitable where residual voltage must be cleared before system reset. | Select when lower cost and smaller footprint (SOT-25) outweigh need for discharge; verify load transient response meets system timing. |
| Ricoh RP114K251D-TR-F | 250 nA IQ, 300 mA output, 2.5 V fixed, includes output discharge, but requires 4.7 µF min. ceramic output cap. | Higher minimum COUT increases board area and cost vs. MCP1812AT-025/TT's 2.2 µF requirement. | Choose if existing design uses 4.7 µF caps and needs drop-in replacement; confirm thermal performance at 300 mA in target layout. |
Compared with XC6210B252MR-G and RP114K251D-TR-F, the MCP1812AT-025/TT uniquely combines 300 mA output, 2.2 µF ceramic stability, and 10 nA shutdown current in a 3-lead SOT-23 - enabling smallest possible footprint for high-current, zero-leakage battery systems.
Availability
MCP1812AT-025/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and hearing aid audio subsystems requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1812AT-025/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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.
The MCP181X/12X product line was designed specifically for ultra-low-power, long-life battery and energy-harvesting systems - prioritizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust shutdown behavior.
FAQ
What is the maximum input voltage rating for the MCP1812AT-025/TT?
The MCP1812AT-025/TT has an absolute maximum input voltage rating of +6.0 V. However, its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate safety margins defined in Microchip's DS20006088C datasheet. Always ensure VIN remains within 1.8–5.5 V during normal operation and transient conditions.
Does the MCP1812AT-025/TT require an external resistor divider to set output voltage?
No, the MCP1812AT-025/TT is a fixed-output LDO with factory-trimmed 2.5 V regulation. It does not support adjustable output via external resistors. The "025" in the part number explicitly denotes the 2.5 V version, and no feedback pins or adjustment terminals are present in its 3-lead SOT-23 configuration.
Can the MCP1812AT-025/TT be used with a 1 µF output capacitor?
No - the MCP1812AT-025/TT 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 only 1 µF risks oscillation or poor transient response, especially under 300 mA load steps. The 1 µF value applies only to the 150 mA MCP1811X family.
Is the MCP1812AT-025/TT pin-compatible with other variants in the MCP1812X series?
Yes - all MCP1812X devices (including MCP1812AT-025/TT, MCP1812AT-330/TT, etc.) share identical 3-lead SOT-23 pinout (VIN, VOUT, GND) and thermal pad absence. Voltage variants differ only in internal feedback ratio; no pin reassignment or layout change is needed when swapping between fixed-output versions in the same package.
What is the thermal resistance (θJA) of the MCP1812AT-025/TT in SOT-23 package?
The MCP1812AT-025/TT in 3-lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard PCB layout practices; actual θJA will improve with added copper pour or thermal vias beneath the device body.
MCP1812AT-025/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):
- 2.5V
- 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-025/TT FAQ
1.How can I place an order for MCP1812AT-025/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-025/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-025/TT reliable?
The price and inventory of MCP1812AT-025/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-025/TT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-025/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-025/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-025/TT?
MCP1812AT-025/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-025/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-025/TT?
For technical support, including MCP1812AT-025/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-025/TT requirements.
6.How does Aetrix verify that MCP1812AT-025/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-025/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-025/TT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-025/TT?
All MCP1812AT-025/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-025/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-025/TT part is unused and in its original packaging.
Return procedure for MCP1812AT-025/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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