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NCP1117ST18T3G

Name: NCP1117ST18T3G
Rating: 4.7 (12 reviews)

IC REG LINEAR 1.8V 1A SOT223

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Mfr。パート #NCP1117ST18T3G
パッケージ SOT-223-4 , TO-261-4
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仕様

Package	Tape & Reel (TR),Cut Tape (CT)
ProductStatus	Active
OutputConfiguration	Positive
OutputType	Fixed
NumberofRegulators	1
Voltage-Input(Max)	20V
Voltage-Output(Min/Fixed)	1.8V
VoltageDropout(Max)	1.2V @ 800mA
Current-Output	1A
Current-Quiescent(Iq)	10 mA
PSRR	70dB (120Hz)
ProtectionFeatures	Over Current, Over Temperature
OperatingTemperature	0°C ~ 125°C
MountingType	Surface Mount
Package/Case	TO-261-4, TO-261AA

概要

Description

NCP1117ST18T3G is a fixed-output low-dropout (LDO) regulator from the NCP1117 family. It provides a regulated 1.8 V rail from a higher input voltage (typical input up to about 15 V) and can deliver roughly 1 A load current, with dropout around about 1 V at full current.
Key features
- Fixed output: 1.8 V
- Load current: up to ≈1 A
- Dropout: ~1 V at high current
- Protections: current limiting and thermal shutdown
- Package: NCP1117ST variants in SOT-223/TO-220-like packaging (check datasheet for exact pinout)
Capacitors and usage
- Requires external capacitors for stability: typically 10 μF low-ESR on input and 10 μF on output (plus a 0.1 μF bypass close to pins).
- Input voltage should be high enough above 1.8 V (plus dropout) and within the device’s max rating.
- Power dissipation depends on (Vin − 1.8V) × Iout; use proper heat sinking if needed.
Typical use: generate a stable 1.8 V rail for microcontrollers, sensors, or other 1.8 V logic. Always verify exact pinout and ESR recommendations in the datasheet.

Features

Here are the key features of NCP1117ST18T3G (1.8 V fixed LDO, 1 A):
- Fixed 1.8 V output regulator in ST package (lead-free, RoHS)
- Output current up to 1 A
- Low dropout: about 1.1–1.2 V at 1 A
- Input voltage range up to 15 V (max Vin ≈ 15 V)
- Requires external capacitors for stability (typical: 10 μF on output with suitable ESR; input cap recommended)
- Short-circuit protection and thermal/shutdown protection
- Good line and load regulation; low noise
- Internal current limit protection
- No external feedback network (no enable pin; fixed output)

Package

SOT-223 (3-pin) surface-mount package.

Pinout

3 pins. It is a fixed 1.8 V low-dropout regulator (NCP1117 series). Pinout (left to right, front view): Pin 1 = Ground/Adjust, Pin 2 = Vout, Pin 3 = Vin.

Manufacturer

- Manufacturer: ON Semiconductor (ON Semiconductor Corp.).
- What kind of company: An American multinational semiconductor company that designs and manufactures a broad range of ICs and discrete devices, including power management, analog, and sensor chips for automotive, industrial, and consumer markets.

Application

- Fixed 1.8 V LDO regulator for 1.8 V logic/core rails.
- Powers microcontrollers, microprocessors, FPGAs/ASICs, and 1.8 V memories (Flash/RAM).
- Used as a local regulator on PCBs in consumer electronics, telecom, and automotive electronics.
- Suitable for portable/embedded devices and development boards as a simple 1.8 V supply source or to replace discrete zeners.

Equivalent

Equivalent 1.8V LDOs drop-in substitutes for NCP1117ST18T3G include:
- LM1117-1.8 (Texas Instruments)
- AMS1117-1.8 (widely available from multiple vendors)
- LD1117V18 (STMicroelectronics) / LD1117AV18
- AP1117-1.8 (Diodes Inc.)
Note: verify pinout and capacitor requirements for your package (TO‑220/SOT‑223) before substitution.