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Microchip Technology MCP1812AT-033/7QX
- Part No.:
- MCP1812AT-033/7QX
- Manufacturer:
- Microchip Technology
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
MCP1812AT-033/7QX.pdf
- Description:
- IC REG LINEAR 3.3V 300MA 4UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,909
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Product details
Overview
MCP1812AT-033/7QX from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 3.3V low-dropout linear regulator in a 4-lead 1×1 mm UDFN package with exposed thermal pad, designed for energy harvesting and long-life battery-powered systems requiring stable low-noise output under light-to-moderate load.
For engineers reviewing the MCP1812AT-033/7QX datasheet, MCP1812AT-033/7QX pinout, MCP1812AT-033/7QX application, or MCP1812AT-033/7QX 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-033/7QX implements a PMOS pass transistor architecture enabling ultra-low IQ operation and 400 mV typical dropout at 300 mA. It integrates an active discharge transistor (RDCH = 100 Ω) that pulls VOUT to GND during shutdown (SHDN = GND), preventing residual voltage hold-up in power-gated subsystems.
Stable with only 2.2 µF ceramic output capacitance, it achieves 165.65 µVrms integrated noise (10 Hz–100 kHz) and -50 dB PSRR at 1 kHz with no input capacitor-critical for noise-sensitive analog and RF front-end power domains in compact portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - ensures compatibility with 3.3V logic families without external feedback network. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, sensors) while maintaining ultra-low sleep IQ. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices operating >99.9% of time in sleep mode. |
| Shutdown Current | 10 nA typical - reduces system standby leakage to negligible levels when fully powered down. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to VIN = 3.7V, compatible with single-cell Li-ion/Li-poly after discharge. |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, low ESR, and high reliability vs. electrolytic alternatives. |
| Thermal Resistance | θJA = 91.05°C/W (JEDEC 4-layer board) - supports continuous 300 mA operation up to +85°C ambient with minimal heatsinking. |
Pinout & Package
Package: 4-lead 1×1 mm UDFN with exposed thermal pad (EP). Optimized for space-constrained PCB layouts and enhanced thermal dissipation via soldered EP connection to internal ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.4V–5.5V input; minimum 2.4V required for full 300 mA output at 3.3V. |
| SHDN | Active-low enable control | Pulled high internally; driven low to enter 10 nA shutdown with VOUT discharge enabled. |
| VOUT | Regulated 3.3V output | Delivers stable 3.3V to load; requires ≥2.2 µF X7R ceramic capacitor for stability and low noise. |
| GND | Ground reference | Return path for load and quiescent current; must connect to quiet ground plane near output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in coin-cell-powered IoT nodes with 1-second wake/sleep cycles. |
| VOUT discharge on shutdown | Eliminates need for external bleed resistor; ensures rapid, deterministic power-down sequencing. |
| Ceramic-capacitor stable (2.2 µF) | Reduces BOM count and board area vs. tantalum/electrolytic solutions; improves reliability and temperature stability. |
| Overcurrent protection | Current limit of 500–840 mA prevents damage during short-circuit events without latch-up. |
| Low noise (165.65 µVrms) | Supports precision analog signal chains and RF receivers without additional LDO filtering stages. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in smartwatch form factor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 3.3V power rail for analog front-end, MCU, and BLE transceiver during active measurement bursts. Use Value: 250 nA quiescent current extends battery life beyond 2 years; VOUT discharge ensures clean reset between sampling intervals. |
Use Scenario: Wireless environmental sensor node powered by solar harvester with supercapacitor buffer. IC Role / Device Role / Timing Role: Regulates variable harvester output (2.8–5.2V) to stable 3.3V for microcontroller and radio during intermittent transmission. Use Value: 400 mV dropout enables usable runtime even as supercapacitor voltage decays below 3.7V; 2.2 µF ceramic cap withstands wide temperature swings. |
| Hearing Aid Processor | Smart Card Interface Module |
|
Use Scenario: Miniature rechargeable hearing aid with DSP-based audio processing and Bluetooth LE streaming. IC Role / Device Role / Timing Role: Supplies low-noise 3.3V to audio codec and digital signal processor during voice activity detection and streaming. Use Value: 165.65 µVrms noise floor avoids audible artifacts; 10 nA shutdown current preserves charge during extended idle periods. |
Use Scenario: Contactless payment terminal using ISO/IEC 14443-A/B interface with embedded secure element. IC Role / Device Role / Timing Role: Provides regulated 3.3V to secure IC and RF transceiver during NFC field activation and cryptographic operations. Use Value: Fast start-up (<400 µs delay) ensures responsive card detection; overcurrent protection safeguards against antenna coupling faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-3302E/MB | Same 3.3V output, 300 mA rating, and 250 nA IQ, but in 5-lead SOT-23 package with NC pin instead of UDFN EP. | Larger footprint and higher θJA (184.82°C/W); less suitable for thermally constrained or ultra-dense layouts. | Select when legacy SOT-23 assembly infrastructure exists and thermal margin exceeds 25°C. |
| Torex XC6210B332MR-G | 300 mA, 3.3V, 250 nA IQ, but no VOUT discharge; shutdown current 50 nA (vs. 10 nA). | Lacks active discharge, requiring external circuitry for clean power-down in safety-critical or sequenced systems. | Choose where discharge functionality is unnecessary and SOT-23-5 availability is prioritized over thermal performance. |
Compared with MCP1812AT-033/7QX, the SOT-23 alternative trades thermal efficiency and board area for assembly compatibility, while the Torex part omits discharge capability and has five times higher shutdown leakage-making the UDFN variant optimal for space- and power-constrained designs demanding deterministic shutdown behavior.
Availability
MCP1812AT-033/7QX is available at Aetrix Electronics and suitable for energy harvesting systems, wearable medical devices, and smart card interfaces requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1812AT-033/7QX 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 microcontrollers, analog components, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software offerings.
The MCP1812AT-033/7QX belongs to Microchip's ultra-low-power LDO family engineered specifically for battery longevity in intermittent-operation edge devices-balancing nanoscale IQ, fast transient response, and ceramic-capacitor simplicity.
FAQ
What is the minimum input voltage required for MCP1812AT-033/7QX to deliver full 300 mA output?
The MCP1812AT-033/7QX requires a minimum input voltage of 2.4V to sustain 300 mA output at 3.3V, per the datasheet's AC/DC characteristics table. Below this, current capability degrades due to dropout constraints; at VIN = 3.7V, it maintains full regulation with 400 mV headroom.
Does MCP1812AT-033/7QX require an input capacitor?
No, the MCP1812AT-033/7QX is stable without an input capacitor, as confirmed by PSRR test conditions in DS20006088C-page 5. However, a 1 µF ceramic input capacitor is recommended for high-frequency noise suppression and improved line transient response in noisy environments.
How does the output discharge function operate in MCP1812AT-033/7QX?
When SHDN is pulled low, the MCP1812AT-033/7QX activates an internal discharge transistor (RDCH = 100 Ω) between VOUT and GND, actively pulling the output to ground within microseconds. This eliminates residual voltage hold-up, ensuring safe and repeatable power-down sequencing in multi-rail systems.
Can MCP1812AT-033/7QX be used with tantalum or aluminum electrolytic output capacitors?
No-MCP1812AT-033/7QX is explicitly characterized and guaranteed stable only with ceramic (X7R) output capacitors of ≥2.2 µF. Tantalum or aluminum electrolytics introduce ESR and capacitance drift that can cause instability, oscillation, or degraded transient response per Section 4.2 of the datasheet.
What is the thermal performance of MCP1812AT-033/7QX on a standard 4-layer PCB?
On a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias, the MCP1812AT-033/7QX exhibits θJA = 91.05°C/W. At 300 mA load and 3.3V output, power dissipation is ~270 mW, resulting in ~25°C junction-to-ambient rise-well within the +85°C max operating junction temperature limit.
MCP1812AT-033/7QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- 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):
- 3.3V
- 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:
- 4-UQFN (1x1)
MCP1812AT-033/7QX FAQ
1.How can I place an order for MCP1812AT-033/7QX through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-033/7QX 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-033/7QX reliable?
The price and inventory of MCP1812AT-033/7QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812AT-033/7QX is usually 5 days.
3.What payment methods are accepted for MCP1812AT-033/7QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-033/7QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-033/7QX?
MCP1812AT-033/7QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-033/7QX 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-033/7QX?
For technical support, including MCP1812AT-033/7QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-033/7QX requirements.
6.How does Aetrix verify that MCP1812AT-033/7QX is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-033/7QX 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-033/7QX meets industry standards.
7.What is the process for return or replacement of MCP1812AT-033/7QX?
All MCP1812AT-033/7QX units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-033/7QX, 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-033/7QX part is unused and in its original packaging.
Return procedure for MCP1812AT-033/7QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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