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Microchip Technology MCP1812AT-030/OT
- Part No.:
- MCP1812AT-030/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812AT-030/OT.pdf
- Description:
- IC REG LINEAR 3V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,849
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Product details
Overview
MCP1812AT-030/OT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 3.0 V 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 hearing aids and smart wearables.
For engineers reviewing the MCP1812AT-030/OT datasheet, MCP1812AT-030/OT pinout, MCP1812AT-030/OT application, or MCP1812AT-030/OT equivalent, key selection criteria include ultra-low shutdown current, 300 mA output capability at low VIN, output discharge functionality, and compatibility with miniature 3-lead SOT-23 packaging for space-constrained designs.
Technical Context
The MCP1812AT-030/OT belongs to the MCP1812A variant group, featuring active output discharge during shutdown (SHDN = GND) and a fixed 3.0 V output voltage. Its internal error amplifier and PMOS pass transistor enable stable regulation down to 400 mV dropout at 300 mA load.
It supports operation across –40°C to +85°C junction temperature and delivers ±25 mV load regulation over 1 mA–300 mA. The device uses no external compensation and achieves –50 dB PSRR at 1 kHz with zero input capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±4% - ensures stable supply for 3.3 V I/O logic with margin for voltage drop in PCB traces. |
| Max Output Current | 300 mA - sufficient to power microcontrollers, sensors, and RF transceivers in compact portable devices. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-mode applications like wireless sensor nodes. |
| Shutdown Current | 10 nA typical - critical for energy harvesting systems where leakage must be minimized during idle periods. |
| Dropout Voltage | 400 mV @ 300 mA - allows operation from single-cell Li-ion (3.0 V min) or two alkaline cells (3.2 V min) under full load. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, low-ESR filtering without tantalum or electrolytic components. |
| PSRR | –50 dB @ 1 kHz - suppresses switching noise from adjacent DC/DC converters without requiring additional LC filtering. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body height, thermal pad not present.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass; minimum 2.4 V input needed for 300 mA output at 3.0 V. |
| 2 (GND) | Ground reference | Low-impedance return path for ground current (≤220 µA); must connect directly to output capacitor cathode for optimal PSRR. |
| 3 (VOUT) | Regulated output | Delivers fixed 3.0 V; requires ≥2.2 µF X7R ceramic capacitor placed within 2 mm for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 250 nA typical - extends shelf life and operational runtime in coin-cell-powered IoT endpoints. |
| Output discharge on shutdown | 100 Ω typical RDCH - actively discharges VOUT to GND within microseconds when SHDN is pulled low, preventing floating bias in downstream circuitry. |
| Ceramic-capacitor stability | 2.2 µF minimum COUT - eliminates need for larger, less reliable tantalum capacitors and reduces BOM count. |
| Wide input voltage range | 1.8–5.5 V - supports direct connection to single Li-ion, two NiMH, or three alkaline cells without pre-regulation. |
| Overcurrent protection | 500–840 mA current limit - provides short-circuit robustness while maintaining thermal safety in sealed enclosures. |
Applications
| Energy Harvesting Node | Wearable Health Monitor |
|---|---|
|
Use Scenario: Indoor light or thermal energy harvester powering a BLE sensor node with intermittent transmission. IC Role / Device Role / Timing Role: Primary 3.0 V power rail regulator enabling microcontroller wake-up and radio burst transmission. Use Value: 250 nA IQ and 10 nA shutdown current maximize energy capture efficiency; 300 mA peak supports instantaneous RF transmit bursts. |
Use Scenario: Compact wrist-worn ECG patch operating continuously for 7+ days on a CR2032 cell. IC Role / Device Role / Timing Role: Main supply regulator for analog front-end, MCU, and BLE SoC during active and deep-sleep cycles. Use Value: Output discharge prevents residual charge from interfering with analog signal integrity during sleep; 400 mV dropout enables full battery utilization. |
| Hearing Aid Audio Front-End | Smart Card Reader Module |
|
Use Scenario: Miniature rechargeable hearing aid with MEMS microphone and Class-D receiver driver. IC Role / Device Role / Timing Role: Low-noise 3.0 V supply for microphone bias and audio signal chain amplification. Use Value: –50 dB PSRR at 1 kHz rejects switching noise from charging IC; 169 µVrms output noise preserves SNR in audio band. |
Use Scenario: Contactless NFC reader module powered by disposable AA batteries in point-of-sale terminals. IC Role / Device Role / Timing Role: Stable 3.0 V source for secure element, NFC controller, and antenna driver during card polling. Use Value: 300 mA capability supports simultaneous NFC field generation and crypto processing; 2.2 µF ceramic capacitor fits tight layout constraints. |
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/OT | Same 3.0 V output, but 5 nA shutdown current (MCP1812B variant); no output discharge. | Suitable where ultra-deep shutdown is prioritized over active VOUT discharge. | Select when system requires lowest possible leakage during extended standby, and downstream circuits tolerate floating VOUT. |
| TPL7407LDR | 300 mA, 3.0 V, 2.5 µA IQ (not nA), no shutdown, 7-channel high-side driver with integrated LDO-like regulation. | Designed for LED/relay driving; lacks ultra-low IQ and shutdown control. | Consider only if discrete high-side switching is required alongside regulation - not a functional replacement for ultra-low-power use cases. |
Compared with MCP1812AT-030/OT, MCP1812AT-3002E/OT offers lower shutdown current but forfeits output discharge, while TPL7407LDR trades ultra-low IQ for integrated switching functionality-neither matches the original's combination of 300 mA, 250 nA IQ, and active discharge in SOT-23.
Availability
MCP1812AT-030/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and hearing aid audio front-ends requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1812AT-030/OT 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, headquartered in Chandler, Arizona.
The MCP1812A family targets ultra-low-power battery and energy-harvesting applications, delivering high output current with nanoscale quiescent consumption to extend operational lifetime in maintenance-free edge devices.
FAQ
What is the maximum input voltage rating for the MCP1812AT-030/OT?
The MCP1812AT-030/OT has an absolute maximum input voltage of +6.0 V. Operation above 5.5 V violates the recommended operating conditions and may cause permanent damage. For reliable long-term performance, VIN must remain between 1.8 V and 5.5 V, with ≥2.4 V required to sustain 300 mA output at 3.0 V.
Does the MCP1812AT-030/OT require an input capacitor?
The MCP1812AT-030/OT does not require an input capacitor for stability, but a 1 µF ceramic capacitor placed close to the VIN pin is strongly recommended to reduce high-frequency noise and improve transient response. This capacitor minimizes voltage spikes caused by PCB trace inductance during load steps.
Is the MCP1812AT-030/OT pin-compatible with other variants in the MCP1812 family?
Yes - all MCP1812X variants in the 3-lead SOT-23 package share identical pinout (VIN–GND–VOUT) and footprint. The MCP1812AT-030/OT is mechanically and electrically interchangeable with MCP1812AT-180/OT or MCP1812AT-330/OT, provided the output voltage requirement matches the application's needs.
How does the output discharge function operate in the MCP1812AT-030/OT?
In the MCP1812AT-030/OT, pulling SHDN low activates an internal discharge transistor (RDCH ≈ 100 Ω) between VOUT and GND. This rapidly discharges the output capacitor, bringing VOUT to near-zero volts within microseconds. This prevents unintended biasing of downstream circuitry during power-down sequences.
What is the thermal resistance (θJA) of the MCP1812AT-030/OT in SOT-23 package?
The MCP1812AT-030/OT 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. Under 300 mA load at 5.5 V input, power dissipation reaches ~750 mW, requiring careful thermal design or derating above +60°C ambient.
MCP1812AT-030/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
MCP1812AT-030/OT FAQ
1.How can I place an order for MCP1812AT-030/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-030/OT 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/OT reliable?
The price and inventory of MCP1812AT-030/OT 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/OT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-030/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-030/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-030/OT?
MCP1812AT-030/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-030/OT 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/OT?
For technical support, including MCP1812AT-030/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-030/OT requirements.
6.How does Aetrix verify that MCP1812AT-030/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-030/OT 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/OT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-030/OT?
All MCP1812AT-030/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-030/OT, 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/OT part is unused and in its original packaging.
Return procedure for MCP1812AT-030/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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