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LD1117DTTR

Name: LD1117DTTR
Rating: 4.7 (12 reviews)

IC REG LINEAR POS ADJ 800MA DPAK

製造商
製造商。部分 #LD1117DTTR
包 TO-252-3,DPAK(2Leads+Tab),SC-63
資料表 LD1117DTTR DataSheet
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規格

Package	Tape & Reel (TR),Cut Tape (CT)
ProductStatus	Active
OutputConfiguration	Positive
OutputType	Adjustable
NumberofRegulators	1
Voltage-Input(Max)	15V
Voltage-Output(Min/Fixed)	1.25V
Voltage-Output(Max)	15V
VoltageDropout(Max)	1.2V @ 800mA
Current-Output	800mA
Current-Quiescent(Iq)	5 mA
PSRR	75dB (120Hz)
ProtectionFeatures	Over Current, Over Temperature
OperatingTemperature	0°C ~ 125°C
MountingType	Surface Mount
Package/Case	TO-252-3, DPak (2 Leads + Tab), SC-63

概述

Description

LD1117DTTR is a low-dropout (LDO) regulator from the LD1117 family. It is used to regulate a higher input down to a stable lower voltage (fixed outputs such as 3.3V or 5V, or adjustable versions) for microcontrollers, sensors, etc. Typical current capability is about 800 mA to 1 A with adequate heatsinking; dropout at full load is ~1.1–1.3 V. Input voltage rating is roughly up to 15 V. Like other LDOs, it requires external capacitors for stability on input and output (commonly around 10 µF or larger; follow the datasheet ESR requirements). Quiescent current is a few milliamps. The DTTR suffix indicates a specific packaging/packaging option; exact pinout and ratings depend on the variant and package—consult the datasheet for your LD1117DTTR. Common uses: 3.3V/5V rails for microcontrollers, sensors, and small embedded systems. In short: a compact, inexpensive LDO for stepping down a higher supply to a stable lower voltage.

Features

LD1117DTTR features (key points):
- 1 A low-dropout (LDO) regulator
- Dropout voltage ~1.2 V at 1 A
- Input voltage range up to 15 V
- Fixed outputs (e.g., 3.3 V, 5.0 V; other values in the LD1117 family) and adjustable version via external resistors
- Internal current limit and thermal/shutdown protection
- Requires output capacitor (10–22 µF, low ESR) for stability; input capacitor recommended
- Good line and load regulation
- Three-terminal surface-mount package (DTTR) suitable for compact designs

Package

LD1117DTTR is the LD1117 in a SOT-223 package, delivered on Tape & Reel (TR).

Pinout

LD1117DTTR is a 3‑pin low‑dropout regulator (SOT‑223/TO‑263 style; tab tied to Vout). Pins: 1 = Ground/Adj, 2 = Vout, 3 = Vin. It regulates Vin to a fixed (or adjustable) output voltage; the tab is connected to Vout.

Manufacturer

- Manufacturer: STMicroelectronics (ST).
- What kind of company: A global semiconductor company that designs and manufactures integrated circuits and discrete components (e.g., microcontrollers, power management ICs, sensors). STMicro is headquartered in Geneva, Switzerland, with a worldwide presence.

Application

LD1117DTTR is a low-dropout regulator used as a local voltage regulator in many apps. Common areas:
- Embedded systems/microcontroller boards (local 3.3V/5V rails for logic, sensors, memory)
- Post-regulation in power supplies for displays, RF modules, ADC/DAC
- Battery-powered/portable devices needing a compact LDO (up to ~800 mA)
- Automotive/industrial electronics for regulated rails
- Prototyping/development kits as a simple, inexpensive regulator

Equivalent

LD1117DTTR is a 1 A low-dropout regulator. Common equivalents are:
- AMS1117 family (fixed: 3.3V, 5.0V, 2.5V, 1.8V; also ADJ)
- LM1117 family (3.3V/5.0V/2.5V; ADJ)
- AP1117
- NCP1117
- KA1117
All are 1 A LDOs with similar pinouts and ~1 V dropout. When substituting, verify exact voltage, package (TO-263/TO-220/SOT-223) and required capacitors.