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    Parts    MCP1703AT-3302E/CBVAO
MCP1703A 3.3V LDO Regulator

MCHPMCP1703A 3.3V LDO Regulator

MPN: MCP1703AT-3302E/CBVAO
Microchip Technology
LDO Voltage Regulators LOWIQ 250MA LDO, VIN 16V MAX, VOUT=3.3V
Active2,447 in stock
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Overview

The MCP1703A is a low quiescent current LDO voltage regulator from Microchip that provides a fixed 3.3 V output. It is designed for small embedded systems that need a simple, efficient way to convert a higher input voltage down to a stable rail. This part is a good fit when battery life matters and the load current stays within its 250 mA class.

Why Choose This Part

The main advantage of this regulator is its low quiescent current, which helps minimize wasted battery power in always-on or sleep-heavy systems. A fixed 3.3 V output simplifies design, and the 16 V maximum input rating gives useful margin for common unregulated inputs. For compact embedded hardware, it is an easy way to generate a local low-noise rail without a switching regulator.

Applications

Battery-powered microcontroller rails
Provide a regulated 3.3 V supply for MCUs, sensors, and simple logic in portable designs.
IoT sensor nodes
Power low-duty-cycle wireless and sensing nodes where low quiescent current helps extend battery life.
Breadboard and prototype power regulation
Add a fixed 3.3 V rail to bench prototypes and early hardware revisions.
Embedded peripheral supply
Feed small peripherals such as EEPROMs, RTCs, and level-sensitive digital ICs from a clean 3.3 V rail.
Always-on standby rails
Maintain a low-power housekeeping supply for systems that spend long periods in sleep or standby.

Key Specifications

PSRR 35dB (100Hz)
Output Type Fixed
Mounting Type Surface Mount
Package / Case TO-236-3, SC-59, SOT-23-3
Current - Output 250mA
Protection Features Over Current, Over Temperature, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC (TJ)
Voltage - Input (Max) 16V
Voltage Dropout (Max) 0.725V @ 250mA
Supplier Device Package SOT-23A-3
Current - Quiescent (Iq) 5 uA
Voltage - Output (Min/Fixed) 3.3V

Getting Started

Use the device as a standard fixed-output LDO with the recommended input and output bypass capacitors from the Microchip datasheet. For layout, keep the capacitors close to the pins and provide sufficient copper area for heat dissipation when the load current is high. For design-in work, start with the MCP1703A datasheet and reference circuits rather than a development board; this part is typically evaluated directly on the target PCB.

MCP1703 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number PSRR Package Output I Temp Range Voltage Dropout (Max) Output V Stock
MCP1703AT-3302E/CBVAO (this part) 100Hz 3-236 250mA -40degC ~ 125degC .. 0.725V 3.3V 2,447
MCP1703T-5002E/CB 100Hz 3-236 250mA -40degC ~ 125degC 0.65V 5V 27,261
MCP1703A-5002E/DBVAO 100Hz 4-261 250mA -40degC ~ 125degC 0.65V 5V 1,858
MCP1703A-5002E/DB 100Hz 4-261 250mA -40degC ~ 125degC 0.65V 5V 1,506
MCP1703AT-3302E/MBVAO 100Hz TO-243AA 250mA -40degC ~ 125degC .. 0.525V 3.3V 555
MCP1703T-1802E/CB 100Hz 3-236 200mA -40degC ~ 125degC — 1.8V 22,744
MCP1703T-2502E/CB 100Hz 3-236 250mA -40degC ~ 125degC 1.1V 2.5V 5,701
MCP1703T-3302E/CB 100Hz 3-236 250mA -40degC ~ 125degC 0.725V 3.3V 25,069
MCP1703AT-3302E/DB 100Hz 4-261 250mA -40degC ~ 125degC .. 0.725V 3.3V 9,441
MCP1703-3302E/DB 100Hz 4-261 250mA -40degC ~ 125degC 0.725V 3.3V 3,892
Also available as: MCP1703AT-5002E/MBVAO, MCP1703AT-5002E/CBVAO, MCP1703T-3302E/DB

Also Consider

MCP1700 3.3V LDO Regulator MCHPMicrochip Technology - A closely related low-IQ fixed 3.3 V LDO from the same family, often suitable when you want a similar ultra-low-power regulator in a different package.
TLV70033 3.3V LDO Regulator TITexas Instruments - A popular 3.3 V low-dropout regulator option for compact low-power designs that need a simple fixed output rail.
AP2112K-3.3 3.3V LDO Regulator DIODiodes Incorporated - A widely used fixed 3.3 V LDO for small embedded boards and peripherals when a straightforward 3.3 V supply is needed.
MIC5504 3.3V LDO Regulator MCHPMicrochip Technology - Another low-power fixed 3.3 V regulator choice from Microchip for designs that need a compact linear supply solution.