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LF33CV

LF33CV

STMicroelectronics
Linear Voltage Regulator IC Positive Fixed 1 Output 500mA TO-220
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Overview

The LF33CV is a positive fixed 3.3V linear voltage regulator from STMicroelectronics. It is capable of delivering up to 500mA of output current, making it suitable for a wide range of general-purpose applications. This regulator features a low-dropout voltage and includes internal protection mechanisms against overcurrent and overtemperature conditions.

Why Choose This Part

Engineers choose the LF33CV for its combination of a very low dropout voltage (0.45V) and excellent supply voltage rejection (80 dB typical), ensuring stable and clean 3.3V power even with varying input voltages. Its internal current and thermal limits provide robust protection for both the regulator and the downstream circuitry. The ability to achieve stability with only a 2.2 uF output capacitor simplifies BOM and board layout.

Applications

Low-Noise Analog Circuits
The LF33CV's typical 80 dB supply voltage rejection makes it a good choice for powering sensitive analog components where clean power is critical to performance.
Low-Power Embedded Systems
With a typical run current of 0.5mA and a shutdown current of 50 uA, this regulator is well-suited for battery-powered devices and other applications requiring efficient power management.
Battery-Powered Portable Devices
Its low-dropout voltage of 0.45 V helps maximize battery life by allowing the regulator to operate efficiently even as the battery voltage declines.
General-Purpose 3.3V Power Supplies
The LF33CV provides a stable and regulated 3.3V output for various digital and mixed-signal circuits that require a moderate current supply up to 500mA.

Key Specifications

PSRR 80dB ~ 65dB (120Hz ~ 65dB)
Output Type Fixed
Mounting Type Through Hole
Package / Case TO-220-3
Current - Output 500mA
Protection Features Over Current, Over Temperature
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC
Voltage - Input (Max) 16V
Voltage Dropout (Max) 0.7V @ 500mA
Current - Supply (Max) 12 mA
Supplier Device Package TO-220
Current - Quiescent (Iq) 1 mA
Voltage - Output (Min/Fixed) 3.3V

Getting Started

To get started with the LF33CV, simply connect the input voltage (up to 16V) and ground to the appropriate pins, and add a 2.2 uF (or larger) capacitor to the output for stability. The TO-220 package is suitable for through-hole mounting on perfboards or custom PCBs. No special IDEs or toolchains are required for its operation, as it is a standalone linear regulator.

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