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Microchip Technology MCP1812AT-020/OT
- Part No.:
- MCP1812AT-020/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812AT-020/OT.pdf
- Description:
- IC REG LINEAR 2V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,678
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Product details
Overview
MCP1812AT-020/OT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with 2.0 V fixed 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 wearable electronics where sleep-mode power budget is critical.
For engineers reviewing the MCP1812AT-020/OT datasheet, MCP1812AT-020/OT pinout, MCP1812AT-020/OT application, or MCP1812AT-020/OT equivalent, this page delivers verified package mapping (SOT-23), confirmed 3-pin terminal roles, real-world load regulation (±50 mV), dropout voltage (400–600 mV at 300 mA), and two validated alternative parts with documented functional trade-offs.
Technical Context
The MCP1812AT-020/OT implements a PMOS pass transistor architecture enabling ultra-low quiescent current while maintaining fast transient response and low noise. Its internal error amplifier and reference are optimized for operation down to 1.8 V input, supporting single-cell Li-ion, coin cell, and energy-harvested sources.
It integrates overcurrent protection with foldback limiting (100 mA at RLOAD = 1 Ω) and an active discharge transistor (RDCH = 100 Ω) that pulls VOUT to GND during shutdown - a feature exclusive to MCP1812A variants, confirmed by Table 1 and Figure 1-1 functional block diagram.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0 V ±4% - ensures stable bias for 2.0 V logic rails and low-voltage microcontrollers without external feedback. |
| Max Output Current | 300 mA continuous - supports higher-power sensors or RF transceivers in compact battery-powered systems. |
| Quiescent Current | 250 nA typical - enables multi-year operation on 100 mAh coin cells in deep-sleep monitoring cycles. |
| Shutdown Current | 10 nA typical - reduces standby drain to negligible levels when system is fully powered down. |
| Dropout Voltage | 400–600 mV at 300 mA - allows regulation from 2.4 V input (e.g., partially discharged LiFePO₄ or alkaline). |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, low ESR, and high PSRR (>50 dB at 1 kHz) without tantalum. |
| PSRR | -50 dB at 1 kHz (no CIN) - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AB), 2.92 mm × 1.3 mm × 1.0 mm body, gull-wing leads, no exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic near pin to ensure stability and PSRR performance. |
| VOUT | Regulated output node | Delivers 2.0 V ±4%; requires 2.2 µF X7R ceramic capacitor directly at pin for loop stability and low-noise operation. |
| GND | Reference and return path | Low-impedance ground tie to output capacitor's negative terminal minimizes noise coupling and improves PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical - extends battery life in devices with >99% duty-cycle sleep (e.g., IoT sensor nodes). |
| Active output discharge | 100 Ω discharge switch - prevents residual VOUT hold-up after shutdown, enabling safe sequencing in multi-rail systems. |
| Ceramic-capacitor stability | Stable with 2.2 µF X7R - eliminates need for larger, less reliable tantalum or electrolytic capacitors. |
| Overcurrent foldback | 100 mA short-circuit limit - protects device and source during fault conditions without thermal runaway. |
| Wide input range | 1.8–5.5 V - accommodates single-cell Li-ion (2.7–4.2 V), NiMH (0.9–1.4 V × 2), and harvested energy sources. |
Applications
| Energy Harvesting Node | Wearable Health Monitor |
|---|---|
|
Use Scenario: Indoor light or thermal energy harvester powers a BLE sensor node with intermittent 10-ms wake-ups every 5 minutes. IC Role / Device Role / Timing Role: Primary 2.0 V power rail regulator; enables sub-µA sleep current and rapid start-up (<400 µs) from SHDN. Use Value: 10 nA shutdown current prevents harvester capacitor leakage from dominating system standby loss. |
Use Scenario: Compact wrist-worn pulse oximeter using optical sensors and low-power MCU, powered by CR2032. IC Role / Device Role / Timing Role: Supplies regulated 2.0 V to analog front-end and MCU core; maintains accuracy across battery discharge (2.0–3.0 V). Use Value: 400 mV dropout at 300 mA allows full sensor burst operation even at end-of-life battery voltage (~2.4 V). |
| Hearing Aid Processor | Smart Card Controller |
|
Use Scenario: Rechargeable hearing aid with DSP-based noise cancellation requiring clean, low-noise 2.0 V supply. IC Role / Device Role / Timing Role: Low-noise LDO delivering 2.0 V to audio codec and DSP; PSRR >50 dB suppresses switching noise from charging IC. Use Value: 169 µVrms integrated output noise (10 Hz–100 kHz) preserves SNR in sensitive audio signal chain. |
Use Scenario: Contactless smart card with embedded secure element and RF interface operating from NFC field. IC Role / Device Role / Timing Role: Provides stable 2.0 V to secure IC during brief 10–100 ms power bursts from RF coupling. Use Value: Fast start-up (200–1000 µs rise time) ensures full regulation before secure transaction begins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-2002E/OT | Same 300 mA, 2.0 V, SOT-23 package; 5 nA ISHDN (B-version), no output discharge | Lower shutdown current but lacks active VOUT discharge - unsuitable where fast rail collapse is required | Select if lowest possible shutdown leakage is critical and discharge is handled externally |
| Torex XC6210B202MR-G | 300 mA, 2.0 V, 250 nA IQ, SOT-23-3; no discharge, 600 mV dropout at 300 mA | Higher dropout limits usable input range; no discharge function; different enable threshold (0.7 V) | Choose when footprint compatibility is needed but discharge and ultra-low dropout are not required |
Compared with MCP1812AT-020/OT, the MCP1812AT-2002E/OT offers lower shutdown current but forfeits output discharge, while the XC6210B202MR-G matches current and IQ but sacrifices dropout performance and discharge capability - making MCP1812AT-020/OT optimal for energy-constrained systems needing both ultra-low IQ and controlled shutdown behavior.
Availability
MCP1812AT-020/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and hearing aid processors requiring stable component supply with long-term lifecycle assurance.
Supply support for MCP1812AT-020/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 is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors, headquartered in Chandler, Arizona.
The MCP1811/12 family was designed specifically for ultra-low-power battery and energy-harvesting applications, emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust shutdown behavior.
FAQ
What is the maximum input voltage rating for MCP1812AT-020/OT?
The absolute maximum input voltage for MCP1812AT-020/OT is +6.0 V, per DS20006088C-page 4 Absolute Maximum Ratings. However, the recommended operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or accelerated parametric drift, and operation above this range is not characterized or guaranteed.
Does MCP1812AT-020/OT include output discharge functionality?
Yes, MCP1812AT-020/OT includes an active output discharge transistor (RDCH = 100 Ω typical) that pulls VOUT to GND when SHDN is driven low. This feature is confirmed in Table 1 (MCP1812A designation) and Figure 1-1 functional block diagram, and distinguishes it from the B-variant (e.g., MCP1812BT-020/OT).
What output capacitor value is required for stability with MCP1812AT-020/OT?
MCP1812AT-020/OT requires a minimum 2.2 µF X7R ceramic output capacitor placed directly at the VOUT pin for guaranteed stability across temperature and load. This value is specified in the Features section and Electrical Characteristics table (DS20006088C-page 4), and enables low-noise operation without additional compensation components.
What is the typical dropout voltage of MCP1812AT-020/OT at full load?
The typical dropout voltage of MCP1812AT-020/OT is 400 mV at 300 mA output current, with a maximum of 600 mV under worst-case conditions (DS20006088C-page 5). This allows regulation from as low as 2.4 V input when delivering full rated current - critical for extending runtime in single-cell battery systems.
Is MCP1812AT-020/OT compatible with PCB layouts designed for other MCP1812 variants?
Yes, MCP1812AT-020/OT uses the standard 3-lead SOT-23 package (MO-178AB) with identical pinout (VIN-VOUT-GND) and footprint as all other MCP1812X SOT-23 variants. No PCB redesign is needed when substituting within the same package option, though functional differences (e.g., discharge presence) must be verified in system-level sequencing.
MCP1812AT-020/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):
- 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-23-5
MCP1812AT-020/OT FAQ
1.How can I place an order for MCP1812AT-020/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-020/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-020/OT reliable?
The price and inventory of MCP1812AT-020/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-020/OT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-020/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-020/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-020/OT?
MCP1812AT-020/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-020/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-020/OT?
For technical support, including MCP1812AT-020/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-020/OT requirements.
6.How does Aetrix verify that MCP1812AT-020/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-020/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-020/OT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-020/OT?
All MCP1812AT-020/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-020/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-020/OT part is unused and in its original packaging.
Return procedure for MCP1812AT-020/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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