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Microchip Technology MCP1812AT-018/OT
- Part No.:
- MCP1812AT-018/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812AT-018/OT.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
MCP1812AT-018/OT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 1.8 V low-dropout linear regulator in SOT-23-5 package, designed for energy harvesting and long-life battery-powered systems requiring stable low-voltage supply with minimal standby power loss.
For engineers reviewing the MCP1812AT-018/OT datasheet, MCP1812AT-018/OT pinout, MCP1812AT-018/OT application, or MCP1812AT-018/OT 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-018/OT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and inherent reverse-current blocking. Its internal reference and error amplifier maintain ±4% output accuracy over -40°C to +85°C junction temperature while drawing only 250 nA quiescent current during regulation.
It features active output discharge during shutdown (SHDN = GND), delivering fast VOUT ramp-down for system-level power sequencing. The device operates across 2.4 V to 5.5 V input range and remains stable with just 2.2 µF X7R ceramic output capacitance - eliminating need for bulk electrolytic or tantalum capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures compatibility with 1.8 V logic rails and low-power microcontrollers without external feedback. |
| Max Output Current | 300 mA continuous - supports higher-current peripherals (e.g., BLE radios, sensors) in compact battery-powered designs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or harvested energy sources with negligible sleep-mode drain. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to VIN = 2.2 V while maintaining regulated 1.8 V output. |
| Input Voltage Range | 2.4 V to 5.5 V - accommodates single-cell Li-ion (3.0–4.2 V), two-cell alkaline (2.4–3.2 V), and USB-powered (5 V) inputs. |
| Shutdown Current | 10 nA typical - reduces system standby power to near-zero when disabled via SHDN pin. |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, high-reliability, low-ESR filtering without bias derating concerns. |
Pinout & Package
Package: 5-Lead SOT-23 (SC-74A), 2.9 mm × 1.6 mm × 1.1 mm body, exposed thermal pad (EP) for enhanced thermal dissipation (θJA = 184.82°C/W on JEDEC 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.4–5.5 V input; requires local 1 µF ceramic bypass capacitor close to pin. |
| SHDN | Active-low enable control | Pulled high internally; driven low to disable regulator and activate output discharge switch (RDCH ≈ 100 Ω). |
| NC | No-connect terminal | Internally unconnected; must be left floating or tied to GND per layout best practices. |
| VOUT | Regulated 1.8 V output | Delivers up to 300 mA; requires 2.2 µF ceramic output capacitor with ESR < 100 mΩ for stability. |
| GND | Ground reference | Low-impedance return path for load and ground current; tie directly to output capacitor ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical quiescent current enables >10-year battery life in 10 µA average-load applications. |
| Output discharge on shutdown | Internal 100 Ω discharge transistor rapidly pulls VOUT to GND (<1 ms decay), preventing back-powering of upstream circuitry. |
| Ceramic-capacitor stability | Stable with 2.2 µF X7R ceramic output cap - eliminates cost, size, and reliability penalties of electrolytic/tantalum alternatives. |
| Overcurrent protection | Foldback current limit (100 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events. |
| High PSRR at low frequency | -50 dB @ 1 kHz (no CIN) - suppresses ripple from noisy switching supplies or shared input rails. |
Applications
| Energy Harvesting Systems | Wearable Electronics |
|---|---|
Use Scenario: Powering wireless sensor nodes powered by solar cells or piezoelectric harvesters with intermittent, low-energy input. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable harvester output into stable 1.8 V supply for ultra-low-power MCU and RF transceiver. Use Value: 250 nA quiescent current minimizes no-load losses, enabling startup from sub-10 µW sources and extending operational duty cycle. | Use Scenario: Supplying 1.8 V core voltage to Bluetooth Low Energy (BLE) SoCs and motion sensors in smartwatches and fitness bands. IC Role / Device Role / Timing Role: Main LDO delivering clean, low-noise 1.8 V rail during active and deep-sleep modes. Use Value: 300 mA output capability supports peak BLE transmit currents while 10 nA shutdown current preserves battery charge between transmissions. |
| Medical Hearing Aids | Smart Card Readers |
Use Scenario: Providing regulated 1.8 V supply to digital signal processors and MEMS microphones in miniature hearing aids. IC Role / Device Role / Timing Role: Critical power rail generator ensuring consistent audio processing performance across battery discharge curve. Use Value: ±4% output tolerance and 400 mV dropout allow full utilization of zinc-air battery (1.0–1.4 V) with boost converter + LDO architecture. | Use Scenario: Powering contactless NFC interface ICs and secure elements in portable card readers used in point-of-sale terminals. IC Role / Device Role / Timing Role: Isolated, low-noise 1.8 V supply for cryptographic co-processors and RF front-end during secure transaction sequences. Use Value: Output discharge feature prevents residual VOUT from interfering with secure element reset timing during rapid power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-018/TT | Same electrical specs; SC-70-5 package (2.0 × 1.25 mm), higher θJA (237.83°C/W) | Better suited for space-constrained layouts where thermal margin >15°C is available | Select when PCB area is more critical than thermal performance under 300 mA load. |
| Torex XC6210B182MR-G | 1.8 V, 300 mA, 250 nA IQ, but no output discharge; SOT-25 package | Lacks active VOUT discharge - requires external circuitry for controlled ramp-down | Choose when system does not require fast output discharge and lower BOM count is prioritized. |
Compared with MCP1812AT-018/TT, the /OT variant offers superior thermal performance (184.82 vs. 237.83°C/W) due to larger SOT-23-5 footprint and exposed pad; versus XC6210B182MR-G, it adds integrated discharge functionality critical for secure power sequencing in portable devices.
Availability
MCP1812AT-018/OT is available at Aetrix Electronics and suitable for energy harvesting systems, wearable electronics, and medical hearing aids requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for MCP1812AT-018/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, analog, FPGA, and mixed-signal semiconductor solutions headquartered in Chandler, Arizona.
The MCP181X/12X product line was engineered specifically for ultra-low-power, long-life 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-018/OT?
The absolute maximum input voltage for MCP1812AT-018/OT is +6.0 V. However, the recommended operating input range is 2.4 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or degrade long-term reliability, even if within absolute maximum ratings. Always ensure VIN stays within the specified operating range for guaranteed performance and lifetime compliance.
Does MCP1812AT-018/OT require an external pull-up resistor on the SHDN pin?
No - MCP1812AT-018/OT includes an internal pull-up resistor on the SHDN pin. The device powers up enabled by default when SHDN is left floating. An external pull-up is unnecessary unless specific noise immunity or precise voltage threshold control is required in high-noise environments.
Can MCP1812AT-018/OT operate with a 1 µF output capacitor?
No - MCP1812AT-018/OT requires a minimum 2.2 µF X7R ceramic output capacitor for stability. Using 1 µF (as specified for MCP1811X variants) risks oscillation and output voltage instability under load transients. Always use ≥2.2 µF ceramic with ESR < 100 mΩ and place it within 2 mm of VOUT and GND pins.
What is the thermal resistance (θJA) of MCP1812AT-018/OT in its SOT-23-5 package?
The junction-to-ambient thermal resistance (θJA) of MCP1812AT-018/OT in the 5-Lead SOT-23 package is 184.82°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias. This value assumes proper use of the exposed thermal pad (EP) connected to a solid ground plane.
Is output discharge active during normal operation of MCP1812AT-018/OT?
No - the output discharge transistor (RDCH) in MCP1812AT-018/OT activates only when SHDN is driven low (≤20% VIN). During normal operation (SHDN ≥70% VIN), VOUT remains regulated and the discharge path is open. Discharge occurs exclusively in shutdown mode to prevent back-powering of downstream circuitry.
MCP1812AT-018/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):
- 1.8V
- 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-018/OT FAQ
1.How can I place an order for MCP1812AT-018/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-018/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-018/OT reliable?
The price and inventory of MCP1812AT-018/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-018/OT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-018/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-018/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-018/OT?
MCP1812AT-018/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-018/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-018/OT?
For technical support, including MCP1812AT-018/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-018/OT requirements.
6.How does Aetrix verify that MCP1812AT-018/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-018/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-018/OT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-018/OT?
All MCP1812AT-018/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-018/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-018/OT part is unused and in its original packaging.
Return procedure for MCP1812AT-018/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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