LD1117S50 STMicroelectronics Integrated Circuit (SOT223 (3-Pin)) In Stock
The LD1117S50 is a fixed 5.0V low dropout linear voltage regulator from STMicroelectronics with up to 800mA output current. It operates from 6.5V to 15V input with a typical 1.1V dropout voltage, housed in a SOT-223 4-pin package. RoHS-compliant with internal current limiting and thermal shutdown protection.
- Manufacturer
- STMicroelectronics
- Package
- SOT223 (3-Pin)
- Pin Count
- 4
- Lifecycle
- OBSOLETE
- Datasheet
- LD1117S50 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LD1117S50?
- Fixed 5.0V output for direct compatibility with standard 5V digital logic and USB power circuits
- Low 1.1V typical dropout voltage maximizes efficiency from 6V to 15V input rails
- SOT-223 package with exposed pad enables up to 800mA output with natural thermal management
- Internal current limiting and thermal shutdown prevent damage during overload conditions
- RoHS-compliant construction meets global environmental compliance requirements
What is LD1117S50 used for?
The LD1117S50 is widely used to regulate 5V power rails for microcontrollers, sensors, and digital logic in embedded systems powered from 7.5V to 12V supplies. Its SOT-223 package and low dropout voltage make it a cost-effective choice for USB device power regulators, development boards, and industrial I/O modules. The internal thermal shutdown protection ensures safe operation in compact enclosures where airflow is limited.
What are the specifications of LD1117S50?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 1.2V |
| Dropout Voltage1-Nom | 1.1V |
| Input Voltage Absolute-Max | 15V |
| Input Voltage-Max | 15V |
| Input Voltage-Min | 6.5V |
| JESD-30 Code | R-PDSO-G4 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.01% |
| Load Regulation-Max | 0.015% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Output Current1-Max | 1.3A |
| Output Voltage1-Max | 5.1V |
| Output Voltage1-Min | 4.9V |
| Output Voltage1-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOT-223 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 2.3mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2% |
| ## LD1117S50 Alternates Showing results | Image |
| Package | SOT223 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LD1117S50 datasheet?
LD1117S50 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for LD1117S50?
Compatible alternatives and drop-in replacements for LD1117S50:
suggested
suggested
Frequently Asked Questions
What input voltage range does the LD1117S50 support for 5V regulation?
The LD1117S50 accepts an input voltage from 6.5V minimum to 15V maximum, with a typical dropout voltage of 1.1V and maximum of 1.2V. This means a minimum input of 6.1V is needed to maintain a regulated 5.0V output, making it compatible with common 7.5V, 9V, and 12V AC adapter power supplies used in consumer and industrial equipment.
How does the LD1117S50 protect itself during short-circuit or overtemperature conditions?
The LD1117S50 integrates internal current limiting that caps output current below a safe threshold during short-circuit events, preventing damage to both the regulator and connected circuitry. It also includes thermal shutdown that automatically disables the output when junction temperature exceeds approximately 150°C, then self-restores when the device cools below the threshold, providing self-protecting operation without external components.
What output current can the LD1117S50 deliver in a SOT-223 package on a standard PCB?
The LD1117S50 in SOT-223 package with exposed thermal pad soldered to a PCB copper plane can deliver up to 800mA continuous output current at 5.0V. The exposed pad provides a thermal resistance of approximately 15°C/W to the PCB, enabling higher current delivery compared to SOT-23 alternatives limited to 150mA to 300mA.
When is the LD1117S50 a better fit than a switching regulator for 5V logic supply?
The LD1117S50 is preferred over a switching regulator when ultra-low output ripple below 10mV, fast transient response for digital loads, and minimal EMI are priorities. For loads up to 800mA with input voltage below 9V, the power dissipation of under 3.2W is manageable in the SOT-223 package, making the linear approach simpler and lower-cost than adding a switching converter with its inductor and filter capacitors.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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