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REG1117

Name: REG1117
Rating: 4.7 (12 reviews)

IC REG LIN POS ADJ 800MA SOT223

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Mfr。パート #REG1117
パッケージ TO-261-4, TO-261AA
データシート
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仕様

Package	Tube
ProductStatus	Active
OutputConfiguration	Positive
OutputType	Adjustable
NumberofRegulators	1
Voltage-Input(Max)	15V
Voltage-Output(Min/Fixed)	1.25V
Voltage-Output(Max)	13.5V
VoltageDropout(Max)	1.2V @ 800mA
Current-Output	800mA
Current-Quiescent(Iq)	10 mA
PSRR	62dB (120Hz)
ProtectionFeatures	Over Current, Over Temperature
OperatingTemperature	-40°C ~ 125°C
MountingType	Surface Mount
Package/Case	TO-261-4, TO-261AA

概要

Description

Introduction to REG1117 (three-terminal LDO regulator)
- What it is: A widely used low-dropout linear regulator family (fixed and adjustable), similar to LM1117. It provides a stable output from a higher input with a small dropout voltage.
- Key specs (typical):
- Fixed outputs (e.g., 3.3 V, 5.0 V) and adjustable versions (Vout = Vref × (1 + R2/R1) + Iadj × R2, with Vref ≈ 1.25 V)
- Maximum input voltage ≈ 15 V; output current up to about 800 mA depending on package/heat sinking
- Dropout ~1.1–1.3 V at moderate load
- Requires input and output capacitors for stability (typical 10 µF or larger; low-ESR within spec)
- Pinout (common packages, e.g., SOT-223/TO-220): Pin 1 = Adj/Gnd, Pin 2 = Vout, Pin 3 = Vin; tab = Vin on many variants
- How to use:
- Cin from Vin to ground; Cout from Vout to ground
- For adjustable: choose R1 (often 240 Ω) and R2 to set Vout
- Considerations: heat dissipation, proper capacitors (ESR range), not ideal for high-current or very low-Vout without adequate cooling.

Features

REG1117 features (positive LDO regulator, 1.25 V reference):
- Fixed outputs (e.g., 3.3 V, 5.0 V) and adjustable variant REG1117-ADJ.
- Output current up to ~1 A (depends on package/heat sinking).
- Low dropout around 1.1–1.3 V at 1 A.
- Input voltage range up to 15 V (typical).
- Requires output capacitor for stability (min ~10 μF, low ESR); input capacitor recommended.
- Quiescent current ≈ 5 mA; good line/load regulation.
- Internal current limit and thermal shutdown protection.
- Short-circuit protection.
- Available in formats such as TO-220, SOT-223, DPAK. Optional protection diode recommended from output to input in some layouts.

Package

REG1117 is a 3-terminal regulator available in both through-hole and surface-mount packages: TO-220 (through-hole) and SOT-223 and TO-263 (SMT) variants.

Pinout

- Pin count: 3
- Function: 1 A low-dropout regulator. Pinout (typical front view): Pin 1 = Ground (or Adjust on adjustable versions), Pin 2 = Output, Pin 3 = Input. Fixed versions have Pin 1 tied to ground.

Manufacturer

There isn’t a single manufacturer for REG1117. REG1117 is a generic 1 A low-dropout (LDO) regulator model used by many vendors, so the “manufacturer” depends on the specific part you have (check the package marking or datasheet).
Kind of company: REG1117 parts come from semiconductor/electronic components manufacturers that design and produce integrated circuits, including voltage regulators and other analog ICs.

Application

REG1117 is a 1 A low-dropout linear regulator family (fixed outputs such as 5.0, 3.3, 2.5, 1.8 V and adjustable). Typical applications: powering microcontrollers and digital ICs from higher rails; post-regulation after switching regulators to reduce ripple; stable rails in battery-powered/portable devices; development boards and general embedded electronics; audio, instrumentation and consumer electronics requiring inexpensive LDOs. Note: requires input/output capacitors and thermal management due to dropout and dissipation.

Equivalent

REG1117 corresponds to the 1117 LDO regulator family. Typical equivalents: LM1117, LD1117, AMS1117, KA1117, NCP1117, AZ1117 (and ME1117) — in fixed outputs such as 3.3V/5V, or LM1117-ADJ. Packaging: TO-220 or SOT-223.