Part Number: NCP1117ST33T3G

Manufacturer: onsemi

Description: IC REG LINEAR 3.3V 1A SOT223

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of NCP1117ST33T3G

Datasheet  NCP1117ST33T3G datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – Linear
Manufacturer ON Semiconductor
Packaging Tape & Reel (TR)
Part Status Active
Regulator Topology Positive Fixed
Voltage – Output 3.3V
Current – Output 1A
Voltage – Dropout (Typical) 1.07V @ 800mA
Number of Regulators 1
Voltage – Input Up to 20V
Current – Limit (Min) 1A
Operating Temperature 0°C ~ 125°C
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Supplier Device Package SOT-223

NCP1117ST33T3G Introduction

The best answer for your voltage control needs is the ON Semiconductor LDO NCP1117ST33T3G linear regulator! Never again stress over components not turning on or off because of insufficient voltage. This voltage regulation device ensures that your circuit runs with extraordinary precision at a fixed voltage of 3.3V with an overall accuracy of 1%.

This device works with a voltage range of up to 20V and is made to give a steady output current of up to 1A. Even when the input voltage varies, it successfully regulates voltage and stabilizes it to a fixed value with a typical dropout voltage of 0.95V at 100mA, 1.01V at 500mA, and 1.07V at 800mA.

Give your circuit a load regulation of 4.3 mV (typical) and a line regulation of 0.8 mV (normal) to ensure a steady current at the output. The LDO NCP1117ST33T3G linear regulator is packaged in tape and reels for shipping, ensuring its security and facilitating simple mounting.

This voltage control device, which has a positive polarity and an operating temperature range of 0°C to 125°C, is adaptable and ideal for various applications. At 100mA, 1.15V, and 800mA, respectively, its maximum dropout voltage is 1.1V, 1.15V, and 1.2V.

NCP1117ST33T3G Description

Low dropout positive voltage regulators, such as those in the NCP1117 series, may deliver output currents of more than 1.0 A with a maximum dropout voltage of 1.2 V at 800 mA over temperature. Nine fixed output voltages in this series—1.5, 1.8, 1.9, 2.0, 2.5, 2.85, 3.3, 5.0, and 12 V—have no minimum load requirements to maintain regulation. A variant with configurable output is also provided; it has two external resistors and may be set to operate between 1.25 V, and 18.8 V. On-chip trimming achieves an accuracy of 1.0% in the reference/output voltage adjustment. Three internal safety measures are the output current limit, safe operating area compensation, and heat shutdown.

The NCP1117 series can function with input voltages of up to 20 V. Devices are offered in DPAK and SOT223 packages.


  • Present Output Greater than 1 A. Maximum Dropout Current of 800 mA at Maximum Dropout Voltage of 1.2 V.
  • Output voltages that are fixed at 1.5, 1.8, 1.9, 2.0, 2.5, 2.85, 3.3, 5.0, and 12 volts.
  • The output voltage can be adjusted as an option.
  • 0% of the Reference/Output Voltage was cut.
  • Defending against current limits, ensuring safe operation, and preventing thermal shutdown.
  • using an input voltage of 20 V.
  • PPAP capable and AEC-Q100 certified; NCV Prefix for Automotive and Other Applications Needing Special Site and Control Change Requirements.


  • Hard Drive Controllers.
  • Battery Chargers.

Applications Information

Compared to the traditional industry standard three-terminal adjustable regulators, the NCP1117 offers a considerable dropout voltage reduction, improved output voltage precision, and temperature stability. These devices are ideal for powering various consumer and commercial items because they provide output current limiting, safe operating area compensation, and thermal shutdown safety. The older LM317 and its derived device types are pin compatible with the NCP1117 family.

● Output Voltage

Voltage regulators that can be adjusted are floating devices. They create and preserve the nominal 1.25 V reference voltage between the output and adjustment pins. Resistor R1 programs the reference voltage to a continuous current source, and this current travels through R2 to the ground to calibrate the output voltage.

Typically, a programmed current level greater than the minimum 5.0 mA required for regulation is chosen. The adjusted pin current, Iadj, produces a minor output voltage error that is typically unnoticeable because it is substantially smaller and consistent than the designed load current. For the fixed output devices, R1 and R2 are built into the device, and the ground current Ignd varies depending on the output voltage from 3.0 mA to 5.0 mA.

● External Capacitors

If the device is more than a few inches from the power source, an input bypass capacitor Cin might be necessary for regulator stability. This capacitor will greatly improve the output transient response and lessen the circuit’s sensitivity when supplied by a complicated source impedance. The regulator’s input and ground terminals should be exactly across the input bypass capacitor’s mounting location, using the minimum track length possible. A tantalum or ceramic capacitor of 10 F should be adequate for most applications.

● Load Regulation

Excellent load regulation is a strength of the NCP1117 series; however, because they are three-terminal devices, only a limited amount of remote load sensing is feasible. Two requirements must be accomplished to execute load regulation at the highest possible level. First, programming resistor R1’s top side must be attached as closely as possible to the regulator case. This will reduce the voltage loss brought on by RW +’s series wiring resistance and the reference voltage across R1.

The second requirement is that R2’s ground end be directly linked to the load. Due to the regulator’s ability to account for the voltage drop brought on by wiring resistance RW, real Kelvin sensing is now possible.

● Thermal Considerations

If the maximum junction temperature is exceeded, this series has an internal thermal limiting circuit to safeguard the regulator. The regulator output turns off when activated, usually at 175°C, and then turns back on when the die cools. As a result, the output will appear to be pulsating if the device is continuously overheated. This feature guard against a catastrophic gadget failure brought on by unintentional overheating. It is not meant to be used in place of suitable heatsinking.


In conclusion, the game-changing LDO NCP1117ST33T3G linear regulator from ON Semiconductor simplifies power management and guarantees the dependable operation of your circuit. This voltage-regulating device is necessary for every electronic application due to its remarkable accuracy, strong current output, and wide operating temperature range.

The NCP1117 and other premium components are available at affordable pricing from ICRFQ, your go-to source for electronic components. To learn more about this cutting-edge technology and how it can improve your circuit’s performance, contact ICRFQ immediately. Take your power management to the next level by obtaining the NCP1117!

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