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Microchip Technology MCP1812AT-030/TT
- Part No.:
- MCP1812AT-030/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812AT-030/TT.pdf
- Description:
- IC REG LINEAR 3V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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Product details
Overview
MCP1812AT-030/TT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 3.0 V output, 250 nA typical IQ, and output discharge functionality (MCP1812A variant). It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors ≥2.2 µF, and delivers stable low-noise power for battery-constrained systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1812AT-030/TT datasheet, MCP1812AT-030/TT pinout, MCP1812AT-030/TT application, or MCP1812AT-030/TT equivalent, this page provides verified electrical specs, package mapping to 3-lead SOT-23, thermal performance data, shutdown behavior, and real-world use cases in energy harvesting and medical edge devices.
Technical Context
The MCP1812AT-030/TT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and minimal ground current (180–220 µA across load). Its internal error amplifier maintains ±4% output accuracy over -40°C to +85°C junction temperature while rejecting supply ripple up to -50 dB at 1 kHz without input capacitor.
It integrates an active discharge transistor (RDCH = 100 Ω typical) that pulls VOUT to GND during SHDN assertion, preventing residual voltage hold-up in sleep-mode systems. The device achieves stability with only 2.2 µF X7R ceramic output capacitance and requires no external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±4% - ensures compatibility with 3.3 V I/O logic domains while allowing margin for voltage drop under load. |
| Max Output Current | 300 mA continuous - supports higher-power microcontrollers or RF transceivers in compact wearable designs. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in coin-cell-powered devices operating >99.9% in sleep mode. |
| Input Voltage Range | 1.8 V to 5.5 V - accommodates single-cell Li-ion (3.0–4.2 V), alkaline (1.8–3.2 V), or USB-supplied systems without external regulation. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to 3.4 V input while maintaining regulated 3.0 V output, extending usable battery range. |
| Shutdown Current | 10 nA typical - reduces system standby power to negligible levels, critical for energy-harvesting applications with intermittent sources. |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables small-footprint, low-ESR filtering with <170 µVrms noise (10 Hz–100 kHz) and no electrolytic dependency. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm, surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V unregulated input; connects directly to battery or upstream DC/DC; requires local 1 µF ceramic bypass. |
| VOUT | Regulated output | Delivers stable 3.0 V ±4%; must be decoupled with ≥2.2 µF X7R ceramic capacitor placed adjacent to pin for stability and noise suppression. |
| GND | Ground reference | Low-impedance return path for load and quiescent current; tie directly to quiet ground plane or output capacitor cathode to minimize PSRR degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 coin cell in sensor nodes with 1-second wake/sleep cycles. |
| Output discharge (DT) | Active pull-down via 100 Ω internal transistor clears VOUT within microseconds upon SHDN assertion, eliminating need for external bleed resistors. |
| Ceramic-capacitor stability | Eliminates ESR requirements and size penalties of tantalum/electrolytic caps-reducing BOM count and board area by >30%. |
| High PSRR (-50 dB @ 1 kHz) | Maintains clean 3.0 V rail despite noisy switching supply inputs, avoiding dedicated LC filters in space-constrained designs. |
| Thermal protection | Internal foldback current limit (100 mA at RLOAD = 1 Ω) and thermal shutdown prevent damage during sustained overload or poor PCB heatsinking. |
Applications
| Wearable Health Monitor | Hearing Aid Power Management |
|---|---|
Use Scenario: Continuous ECG sensing with Bluetooth LE transmission every 5 seconds, powered by a 220 mAh rechargeable Li-polymer cell. IC Role / Device Role / Timing Role: Primary 3.0 V LDO supplying analog front-end, MCU, and BLE radio; activated only during measurement/transmit bursts. Use Value: 250 nA quiescent current extends battery life to 14+ months; output discharge prevents false wake-ups from residual VOUT coupling into sensitive analog inputs. |
Use Scenario: Miniature in-the-ear hearing aid using MEMS microphone and low-power DSP, operating from a 35 mAh zinc-air battery. IC Role / Device Role / Timing Role: Single-point 3.0 V regulation for audio signal chain and digital processing core; enters shutdown between user voice detection events. Use Value: 10 nA shutdown current enables >3-week battery life; 400 mV dropout allows full utilization of zinc-air's declining 1.4–1.2 V discharge curve via upstream boost converter. |
| Energy-Harvesting Sensor Node | Smart Card Reader Module |
Use Scenario: Indoor light-harvesting node powering a temperature/humidity sensor and sub-GHz transceiver, storing energy in a 100 µF supercapacitor. IC Role / Device Role / Timing Role: Final-stage LDO delivering regulated 3.0 V only when supercap voltage exceeds 3.4 V; otherwise held in shutdown. Use Value: 2.2 µF ceramic stability eliminates leakage path through electrolytics; 10 nA shutdown draws less than 1% of typical indoor photovoltaic harvest current. |
Use Scenario: Contactless smart card reader in access control terminal, requiring secure 3.0 V supply for cryptographic IC and NFC frontend during brief card presence windows. IC Role / Device Role / Timing Role: Fast-starting LDO (400 µs delay, 200–1000 µs rise time) triggered by card-detect interrupt to power security module on demand. Use Value: Rapid start-up ensures <1 ms response to card field activation; ±4% output tolerance meets ISO/IEC 7816-3 voltage compliance for secure element communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B302MR-G | 300 mA, 3.0 V fixed, 250 nA IQ, but no output discharge; SC70-3 package only. | Lacks active VOUT discharge - requires external resistor network for fast rail collapse in sleep-critical systems. | Select when board space favors SC70 and discharge is handled externally or unnecessary. |
| Richtek RT9080-30PU5 | 300 mA, 3.0 V fixed, 350 nA IQ, includes discharge, but requires ≥4.7 µF output capacitance and has higher 600 mV dropout. | Higher COUT requirement increases footprint and cost; 600 mV dropout reduces usable battery voltage range by ~200 mV. | Select when higher PSRR (>60 dB @ 1 kHz) is prioritized over minimum IQ or dropout. |
Compared with XC6210B302MR-G and RT9080-30PU5, the MCP1812AT-030/TT uniquely combines 10 nA shutdown, integrated discharge, and 400 mV dropout in SOT-23 - making it optimal for ultra-long-life, space-constrained, and fast-wake applications where residual voltage and battery utilization are critical.
Availability
MCP1812AT-030/TT is available at Aetrix Electronics and suitable for energy harvesting, wearable electronics, and medical device applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for FDA-regulated designs.
Supply support for MCP1812AT-030/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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP181X/12X family was designed specifically for ultra-low-power, battery-operated edge devices - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and rapid enable/disable transitions without compromising regulation accuracy or transient response.
FAQ
What is the maximum input voltage rating for the MCP1812AT-030/TT?
The MCP1812AT-030/TT has an absolute maximum input voltage rating of +6.0 V. Operation beyond this level risks permanent damage. For reliable long-term use, the recommended input range remains 1.8 V to 5.5 V per the datasheet's operational specifications - ensuring proper regulation, thermal safety, and specified quiescent current performance across temperature.
Does the MCP1812AT-030/TT require an input capacitor?
The MCP1812AT-030/TT does not require an input capacitor for stability, as confirmed in the AC/DC Characteristics table (PSRR test condition: CIN = 0 µF). However, a 1 µF ceramic capacitor placed close to the VIN pin is strongly recommended to suppress high-frequency noise and transient spikes from the source, especially when used with switching regulators or long PCB traces.
How does the output discharge function operate in the MCP1812AT-030/TT?
The MCP1812AT-030/TT includes an internal discharge transistor (DT) that activates when SHDN is pulled low. This transistor connects VOUT to GND with a typical on-resistance of 100 Ω, discharging the output capacitor rapidly - typically clearing 3.0 V to <100 mV within tens of microseconds. This feature eliminates the need for external bleed resistors and prevents unintended wake-up or latch-up in downstream circuitry.
Can the MCP1812AT-030/TT be used with a 1.0 µF output capacitor?
No - the MCP1812AT-030/TT requires a minimum of 2.2 µF ceramic (X7R) output capacitance for guaranteed stability, as explicitly stated in the Features and Electrical Characteristics sections. Using only 1.0 µF (suitable for MCP1811X variants) may cause oscillation or excessive output ripple, particularly under dynamic load conditions or elevated temperatures.
What is the thermal resistance (θJA) of the MCP1812AT-030/TT in its SOT-23 package?
The MCP1812AT-030/TT in the 3-lead SOT-23 package has a thermal resistance θJA of 211.33°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard layout practices - adding thermal vias under the exposed pad (if present) or increasing copper area can significantly reduce effective θJA in production designs.
MCP1812AT-030/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):
- 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-23-3
MCP1812AT-030/TT FAQ
1.How can I place an order for MCP1812AT-030/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-030/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-030/TT reliable?
The price and inventory of MCP1812AT-030/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-030/TT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-030/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-030/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-030/TT?
MCP1812AT-030/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-030/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-030/TT?
For technical support, including MCP1812AT-030/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-030/TT requirements.
6.How does Aetrix verify that MCP1812AT-030/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-030/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-030/TT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-030/TT?
All MCP1812AT-030/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-030/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-030/TT part is unused and in its original packaging.
Return procedure for MCP1812AT-030/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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