NCP1117ST33T3G device package

NCP1117ST33T3G schematic symbol

Almost all modern digital electronic devices require low level DC voltages for their functioning. This low DC voltage allows these electronics devices to be battery-powered, portable, lightweight and safe. The typical power supply voltage range for these devices is 3.3V to 5V. Many digital electronic devices require AC mains power supply for charging or direct power up. In such cases rectifier circuits are required to convert the AC power to DC power. These rectifier circuits use diodes, capacitors and voltage regulators to provide low level DC voltage to the electronic components. When a diode bridge converts the AC voltage to DC voltage, the output voltage contains high ripple content which degrades power quality. Capacitors and voltage regulators are used in such power conversion circuits to eliminate the ripple and output a stable DC voltage to the electronic load such as microprocessors or TFTs.

Table of Contents

What is NCP1117ST33T3G？

The NCP1117ST33T3G is a low dropout positive voltage regulator manufactured by ON Semiconductor. The NCP1117ST33T3G is capable of providing an output current in excess of 1.0A whereas the maximum dropout voltage is 1.2V. The output voltage is 3.3V stable DC. The salient features of this device include safe operating area compensation, thermal shutdown, and output current limiter. This device comes in a SOT-223 Lead free package.

Pin Configuration

The pin configuration of the NCP1117ST33T3G linear voltage regulator is given in the table below:

Pin name	Pin description
Common	Ground pin
Input	Supply input
Output	Voltage output

Features

3 terminal device
Stable 3.3V DC output
Maximum dropout voltage of 1.2V
Output current in excess of 1.0A
No minimum load requirement
Current limiter and thermal shutdown features
Lead free packaging
Positive output configuration

Applications

The applications of NCP1117ST33T3G are provided as following:

Consumer and industrial equipment point of regulation
Switching power supply post regulation
Computer hard drive controllers
Battery chargers
Server power supplies
Power supplies in embedded hardware systems

Specifications

The major technical specifications of the NCP1117ST33T3G are provided as following:

Terminals: 3
Max DC input voltage: 20V
Max power dissipation: 15W
Max operating junction temperature: 125^OC
Output voltage: 3.3V
Max output current: 1.0A
Ripple rejection: 64dB
Package: Lead free SOT-223

Alternatives

LM1117IMPX-3.3, TLV1117-33DCY, IFX1117GSV33;

How NCP1117ST33T3G work?

The NCP1117ST33T3G is a low-drop positive voltage regulator which is widely used in switching power supply circuits to get fixed and stable 3.3V output. One of the most common NCP1117ST33T3G based circuit is the full wave diode rectifier power supply. In this power supply, the first stage is a power transformer which steps down 220/120VAC to 3.3VAC. The 2^nd circuit stage is the diode rectifier which converts the 3.3VAC to 3.3VDC. The 3^rd stage in the circuit is the LD1117 regulator which removes the ripple from the converted DC voltage and provides a stable DC voltage at the output.

The application circuit of such a power supply is given in the figure below:

NCP1117ST33T3G application circuit

NCP1117ST33T3G Related Products Prices

Parts	Mfr.	Description	Stock	Prices
NCP1117ST33T3G	ON Semiconductor	IC REG LDO 3.3V 1A SOT223	30000	$0.119 Lowest
NCP1117ST50T3G	ON Semiconductor	IC REG LDO 5V 1A SOT223	79070	$0.211 Lowest
NCP1117STAT3G	ON Semiconductor	IC REG LDO ADJ 1A SOT223	1	$0.203 Lowest
NCP1117ST25T3G	ON Semiconductor	IC REG LDO 2.5V 1A SOT223	12405	$0.251 Lowest