STMicroelectronics LD1117S
LD1117S variants from STMicroelectronics
LD1117S Overview
What changes between part numbers, and what to check before you lock the BOM — Microcontrollers.
Key Features
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 4 distinct suffix patternsExamples: 25TR, 33CTR, 50CTR, 50TR. Decode suffix meaning in the ordering notes under the variant table.
Target Applications
- Microcontrollers — design-in and field replacement
- BOM scrub where only the base prefix is known but suffix is TBD
- Second-source checks when the original MPN is constrained
Ordering Variants
Compare 4 LD1117S part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|
| LD1117S25TR | 2.5V LDO Voltage Regulator, 1.3A, SOT-223, 15V In, SMD | STMicroelectronics | Active | Compliant | In Stock | |
| LD1117S33CTR | 3.3V LDO Regulator, 1.3A, SOT-223, 1% Accuracy, 15V In | STMicroelectronics | Active | Compliant | In Stock | |
| LD1117S50CTR | 5V LDO Voltage Regulator, 1.3A, 1% Acc, SOT-223, SM | STMicroelectronics | Active | Compliant | In Stock | |
| LD1117S50TR | 5V Fixed LDO Regulator, 1.3A, 1% Acc, SOT-223, SM | STMicroelectronics | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on LD1117S map to package, grade, and reel options.
How to Choose the Right LD1117S Microcontrollers
Match the footprint first
Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.
Electrical headroom
Compare voltage and current columns in the variant table. For LD1117S, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.
Temp grade letter matters
Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.
Copy the full MPN
Do not BOM only "LD1117S" — include the full suffix (e.g. 25TR, 33CTR, 50CTR). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for LD1117S product family
Identity
Variant Parameters
Source LD1117S with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 4 ordering variants from STMicroelectronics. Our team supports active, EOL, and hard-to-find component sourcing.
- Original manufacturer parts with traceability options
- BOM upload and multi-line RFQ support
- Package, grade, and compliance verification
Frequently Asked Questions
Common technical questions about the LD1117S product family.