Alternatives to STMicroelectronics LD1117S33TR
STMicroelectronics LD1117S33TR and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
Equivalent and substitute parts for STMicroelectronics LD1117S33TR
 LD1117S33TRSTMicroelectronics | NCP1117ST33T3Gonsemi | LM1117MP-3.3/NOPBTexas Instruments | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Identical SOT-223 package footprint and pin configuration (Pin 1: GND, Pin 2/Tab: VOUT, Pin 3: VIN).Standard SOT-223 package dimensions are identical to the original part.Fixed 3.3V output with equal or superior ratings, including higher output current and input voltage limits. | Identical SOT-223 package footprint and pin configuration.Standard SOT-223 package dimensions match the original perfectly.Fixed 3.3V output with identical 800mA current limit and 15V input voltage maximums. | ||
 AI Summary | LD1117S33TR by STMicroelectronics: Linear Voltage Regulator IC Positive Fixed 1 Output 800mA SOT-223. | This is a high-reliability, drop-in alternative from onsemi that provides up to 1A of output current and supports a higher maximum input voltage of 20V, making it slightly more robust in transient-prone applications.
| A direct industry-standard second source from Texas Instruments, matching all critical electrical specifications, safety features, and dropout performance exactly.
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| Lifecycle Status | Active | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 L3845D1013TRSTMicroelectronics | Discontinued | Obsolete | 2Alternatives availableSee Alternatives |
 ZLDO1117G12TADiodes Incorporated | Non-stock | Obsolete | 6Alternatives availableSee Alternatives |
 LT1763CS8-3.3Analog Devices | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
| LT1112S8Analog Devices | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 DRV11873PWPRTexas Instruments | In stock | Active | 5Alternatives availableSee Alternatives |
 LM1117IMPX-3.3/NOPBTexas Instruments | In stock | Active | 6Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The STMicroelectronics LD1117S33TR is active and in production. The parts listed here are qualified equivalents if you need a second source or better availability.
The closest qualified second sources for the STMicroelectronics LD1117S33TR are the NCP1117ST33T3G (onsemi) and the LM1117MP-3.3/NOPB (Texas Instruments), out of 5 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the LD1117S33TR are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The LD1117S33TR (STMicroelectronics) is a part in the Power Management (PMIC) category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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