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Microchip Technology MCP1812AT-025/OT
- Part No.:
- MCP1812AT-025/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812AT-025/OT.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,839
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Product details
Overview
MCP1812AT-025/OT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 2.5 V low-dropout linear regulator in SOT-23-5 package, featuring output discharge during shutdown and stable operation with 2.2 µF ceramic output capacitor. It supports input voltages from 2.4 V to 5.5 V at full load and is designed for energy harvesting and long-life battery-powered systems.
For engineers reviewing the MCP1812AT-025/OT datasheet, MCP1812AT-025/OT pinout, MCP1812AT-025/OT application, or MCP1812AT-025/OT equivalent, key selection criteria include ultra-low IQ (250 nA), 300 mA output capability, 2.5 V fixed output with ±4% tolerance, output discharge functionality, and compatibility with minimal 2.2 µF ceramic output capacitance.
Technical Context
The MCP1812AT-025/OT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400–600 mV at 300 mA) and near-zero load-dependent quiescent current variation. Its internal error amplifier and reference circuit maintain regulation across –40°C to +85°C junction temperature while supporting fast transient response under dynamic load steps up to 300 mA.
Shutdown control is implemented via a dedicated SHDN pin with logic-level thresholds (70% VIN high, 20% VIN low) and sub-10 nA typical shutdown current. The integrated discharge transistor (RDCH ≈ 100 Ω) actively pulls VOUT to GND when SHDN = GND, eliminating residual output voltage during sleep mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% - ensures stable supply for 2.5 V logic, ADC references, or sensor biasing without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, display drivers) in ultra-low-power systems. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices drawing microampere-average current. |
| Input Voltage Range | 2.4 V to 5.5 V at 300 mA - compatible with single-cell Li-ion, LiFePO₄, or two-cell alkaline inputs. |
| Dropout Voltage | 400–600 mV at 300 mA - allows regulation down to ~2.9 V input when delivering full 2.5 V output. |
| Output Capacitance | 2.2 µF ceramic (X7R) - enables compact, low-ESR, low-noise filtering with no tantalum or electrolytic required. |
| Shutdown Current | 10 nA typical - reduces system standby power to negligible levels in always-on monitoring applications. |
Pinout & Package
Package: 5-Lead SOT-23 (SC-74A), 2.9 mm × 1.6 mm × 1.1 mm body, exposed pad optional per JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.4–5.5 V input; requires local 1 µF ceramic bypass capacitor close to pin. |
| SHDN | Active-low enable/disable control | Pulled high (>1.4 V) for operation; driven low to enter 10 nA shutdown with VOUT discharge. |
| NC | No-connect terminal | Internally unconnected; must be left floating or tied to GND per layout best practice. |
| VOUT | Regulated 2.5 V output | Delivers up to 300 mA; requires 2.2 µF X7R ceramic capacitor directly at pin for stability. |
| GND | Power ground reference | Low-impedance return path for load and regulator ground current; tie to quiet ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in 10 µA average-load IoT sensors using CR2032 or coin cells. |
| Integrated VOUT discharge | Eliminates need for external bleed resistor, reducing BOM count and leakage path in shutdown mode. |
| Stable with 2.2 µF ceramic | Reduces solution size and cost vs. traditional LDOs requiring ≥10 µF tantalum or aluminum electrolytic. |
| ±4% output accuracy | Meets tight tolerance requirements for precision analog front-ends and reference-sensitive ADCs. |
| Overcurrent protection | Foldback current limit (100 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events. |
Applications
| Energy Harvesting Systems | Wearable Medical Sensors |
|---|---|
Use Scenario: Powering wireless environmental monitors powered by thermoelectric or piezoelectric harvesters delivering intermittent µW–mW output. IC Role / Device Role / Timing Role: Primary voltage regulator converting harvested DC to stable 2.5 V for MCU and RF transceiver. Use Value: 250 nA quiescent current minimizes drain on low-energy harvesters during idle periods, extending operational duty cycle. | Use Scenario: Continuous glucose monitors or ECG patches operating from single CR2032 batteries for 6+ months. IC Role / Device Role / Timing Role: Main power rail regulator supplying 2.5 V to ultra-low-power MCU and analog signal chain. Use Value: Output discharge ensures rapid power-down of downstream circuitry upon shutdown, preventing phantom loads and preserving battery capacity. |
| Smart Card Readers | Hearing Aids |
Use Scenario: Contactless smart card interfaces in portable payment terminals where battery replacement is infrequent. IC Role / Device Role / Timing Role: Regulator for secure element and NFC controller requiring clean, stable 2.5 V supply. Use Value: 2.2 µF ceramic stability eliminates ESR-related noise coupling into sensitive cryptographic circuits. | Use Scenario: Miniature hearing aids using zinc-air batteries with steep discharge curves and limited capacity. IC Role / Device Role / Timing Role: Core power management IC delivering regulated 2.5 V to audio DSP and MEMS microphone preamp. Use Value: 300 mA output headroom supports peak current demands of real-time audio processing without brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-2502E/OT | Same 2.5 V output, identical 300 mA rating and 250 nA IQ, but uses SC70-5 package (2.0 × 1.25 mm). | Smaller footprint; lower thermal resistance (θJA = 237.83°C/W vs. 184.82°C/W) but reduced PCB copper area for heat spreading. | Select when board space is constrained and thermal load is light; verify solder mask clearance for SC70 handling. |
| Torex XC6210B252MR-G | 2.5 V fixed output, 300 mA, 1.0 µA IQ (4× higher), no output discharge, requires 1 µF ceramic. | Lacks active VOUT discharge; higher IQ limits use in multi-year battery applications; same SOT-23-5 pinout. | Choose only if discharge function is unnecessary and design tolerates 4× higher sleep current. |
Compared with MCP1812AT-025/OT, the SC70 variant offers smaller size at the cost of thermal performance, while the Torex alternative trades ultra-low IQ and discharge capability for broader vendor availability-neither is pin-compatible nor drop-in due to differing shutdown behavior and quiescent current magnitude.
Availability
MCP1812AT-025/OT is available at Aetrix Electronics and suitable for energy harvesting systems, wearable medical sensors, and smart card readers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1812AT-025/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with broad industrial and automotive qualification coverage.
The MCP1811/1812 family targets ultra-low-power battery-operated applications where multi-year runtime, minimal bill-of-materials, and reliable startup from weak energy sources are critical design requirements.
FAQ
What is the maximum input voltage for the MCP1812AT-025/OT?
The MCP1812AT-025/OT has an absolute maximum input voltage rating of +6.0 V, but its specified operating input range is 2.4 V to 5.5 V at full 300 mA output current. Operation above 5.5 V risks permanent damage and violates the device's qualified electrical specifications.
Does the MCP1812AT-025/OT require an external pull-up resistor on the SHDN pin?
Yes - the MCP1812AT-025/OT SHDN pin is active-low and internally un-biased. A pull-up resistor (typically 1 MΩ to VIN) is required to ensure reliable turn-on; omission may result in undefined startup behavior or failure to regulate.
Can the MCP1812AT-025/OT operate with less than 2.2 µF output capacitance?
No - the MCP1812AT-025/OT is only guaranteed stable with ≥2.2 µF ceramic (X7R) output capacitance. Using smaller values risks oscillation, poor transient response, or output overshoot, especially under 300 mA load steps.
What is the purpose of the NC pin on the MCP1812AT-025/OT?
Pin 3 (NC) on the MCP1812AT-025/OT is a no-connect terminal with no internal connection. It must remain unconnected or be tied to GND per Microchip's layout recommendations to avoid parasitic coupling or mechanical stress on the bond wire.
How does the output discharge feature of the MCP1812AT-025/OT improve system reliability?
The MCP1812AT-025/OT's integrated discharge transistor (RDCH ≈ 100 Ω) actively pulls VOUT to GND within microseconds of SHDN assertion, preventing residual voltage from powering downstream logic or causing latch-up in mixed-voltage systems - a critical safety and reliability feature in battery-constrained designs.
MCP1812AT-025/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):
- 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-23-5
MCP1812AT-025/OT FAQ
1.How can I place an order for MCP1812AT-025/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-025/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-025/OT reliable?
The price and inventory of MCP1812AT-025/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-025/OT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-025/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-025/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-025/OT?
MCP1812AT-025/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-025/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-025/OT?
For technical support, including MCP1812AT-025/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-025/OT requirements.
6.How does Aetrix verify that MCP1812AT-025/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-025/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-025/OT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-025/OT?
All MCP1812AT-025/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-025/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-025/OT part is unused and in its original packaging.
Return procedure for MCP1812AT-025/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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