LD1117S33CTR
STMicroelectronicsSwitzerland

LD1117S33CTR

ActiveVoltage Regulators - LinearSOT-223

IC REG LINEAR 3.3V 800MA SOT223

LD1117S33CTR is a 3.3V fixed output, 800mA low dropout linear regulator in SOT-223 package, operating from -40 to +125°C with internal current and thermal protection.Checked against the datasheet

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Technical parameters

Key specs

Output voltage3.3 V
Output current1.3 AMax · Vin-Vo=5 V，TJ=25 °C
Input voltage≤ 15 V
Dropout voltage1.1 VMax · IO=100 mA，IO=800 mA
Quiescent current5 mATyp · Vin ≤ 8 V

Datasheet-verified parameters

21 items
ParameterValue and test conditionsSource
Output voltage3.3 V (Fixed)
Output current800 mA (Min), 950 mA (Typ), 1300 mA (Max) @ Vin-Vo=5 V, TJ=25 °C
Operating input voltageMax 15 V
Dropout voltage1 V (Typ), 1.1 V (Max) @ IO=100 mA; 1.10 V (Typ), 1.2 V (Max) @ IO=800 mA
Quiescent current5 mA (Typ), 10 mA (Max) @ Vin ≤ 8 V
PackageSOT-223
Operating junction temperature range-40 to +125 °C (for C version)
GradeC version (Industrial)
RoHSCompliant (ECOPACK)
Absolute maximum DC input voltage15 V
Absolute maximum power dissipation12 W
Storage temperature range-40 to +150 °C
Line regulation0.035 % (Typ), 0.2 % (Max) @ Vin-Vo=1.5 to 13.75 V, IO=10 mA
Load regulation0.1 % (Typ), 0.4 % (Max) @ Vin-Vo=3 V, IO=10 to 800 mA
Temperature stability0.5 % (Max)
Long term stability0.3 % (Typ) @ 1000 hrs, TJ=125 °C
Minimum load current2 mA (Typ), 5 mA (Max) @ Vin=15 V
Output noise0.003 % (Typ) of VO @ B=10 Hz to 10 kHz, TJ=25 °C
Supply voltage rejection60 dB (Min), 75 dB (Typ) @ IO=40 mA, f=120 Hz, TJ=25 °C, Vin-Vo=3 V, Vripple=1 VPP
Thermal regulation0.01 %/W (Typ), 0.1 %/W (Max) @ Ta=25 °C, 30 ms Pulse
Protection featuresInternal current and thermal limit
All parameters (21)ExpandCollapse
Power
Current - Output800mA
Current - Quiescent (Iq)10 mA
Voltage Dropout (Max)1.3V @ 800mA
Voltage - Input (Max)15V
Voltage - Output (Max)-
Voltage - Output (Min/Fixed)3.3V
AC and DC characteristics
PSRR75dB (120Hz)
Environment and package
Mounting TypeSurface Mount
Operating Temperature-40°C~125°C
PackageTape & Reel (TR); Cut Tape (CT); Digi-Reel®
Package / CaseTO-261-4, TO-261AA
Supplier Device PackageSOT-223
Other
Base Product NumberLD1117
Control Features-
MfrSTMicroelectronics
Number of Regulators1
Output ConfigurationPositive
Output TypeFixed
Product StatusActive
Protection FeaturesOver Current, Over Temperature
Series-

Pinout and package

Figure 2. Pin connections (top…
Figure 2. Pin connections (top…
Package: SOT-223
PinNameFunctionSource
1ADJ/GND(Adjust/Ground)
2VOUT(Output)
3VIN(Input)
TABVOUT(Output, connected to TAB)

Documents

DatasheetDatasheet · 1.6 MB · 2026-11-09DatasheetDatasheet · 1.5 MB · 2026-09-21
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