Texas Instruments LM1117-3.3 3.3V 1A Low-Dropout Voltage Regulator
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Prices updated: 13 Oct 2026
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About this product
The LM1117-3.3 is a fixed 3.3 V low-dropout linear voltage regulator rated for up to 1 A output current. It is used to power 3.3 V logic and sensors from a higher supply voltage, and it includes thermal overload and short-circuit protection. It needs only minimal external components, typically the capacitors specified in its datasheet.
Specifications
- Output voltage
- 3.3 V fixed
- Output current
- 1 A
- Regulator type
- Low-dropout (LDO) linear
- Protection
- Thermal overload, short circuit, SOA
- External components
- Minimal (one external component, per listing)
Frequently asked questions
Can I use the LM1117-3.3 with a 5 V supply?
Yes, a 5 V input to produce 3.3 V is a common use. The input must stay above the output voltage plus the regulator's dropout voltage, so check the datasheet for the dropout at your load current.
Does the LM1117-3.3 need capacitors?
Yes. Linear regulators like this one typically need input and output capacitors for stable operation. Use the capacitor values and types recommended in the datasheet, since output stability depends on them.
