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STMicroelectronics LD1117S50TR
- Part No.:
- LD1117S50TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-261-4, TO-261AA
- Description:
- IC REG LINEAR 5V 800MA SOT223
- Quantity:
Unit Price:$0
Ext Price:$0
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Product Details
LD1117S50TR - 5.0 V, 800 mA Low-Dropout Regulator
STMicroelectronics LD1117S50TR is a fixed 5.0 V positive linear regulator in a SOT-223 / TO-261-4 package, designed to deliver up to 800 mA with appropriate input headroom and thermal design.
Electrical limits, package, order code, operating range, and production status were checked against ST datasheet DocID2572 Rev 38 and the exact manufacturer listing.
Overview
The LD1117S50TR provides a fixed 5.0 V output for local regulation from a higher positive rail. Its NPN pass element directs most quiescent current into the load, and the device includes internal current limiting and thermal limiting. ST identifies the exact order code as an active industrial Ecopack2 product supplied in SOT-223 on tape and reel.
Key Advantages
Fixed 5.0 V output
No external feedback divider is required to establish the nominal rail.
Up to 800 mA
The device supports moderate-current point-of-load regulation with sufficient thermal margin.
Integrated protection
Internal current limiting and thermal limiting improve overload robustness.
Simple stabilization
ST specifies a common 10 microfarad minimum output capacitor for stability.
Feature Summary
Low-dropout operation
Dropout at 800 mA is 1.10 V typical and 1.2 V maximum.
Tight output accuracy
The 5.0 V option is within plus or minus 1 percent at 25 degrees C.
Supply rejection
Supply-voltage rejection is 60 dB minimum and 75 dB typical under the stated test condition.
SOT-223 power package
The output-connected tab can couple electrical current and heat into the PCB copper area.
Package & Footprint
ST specifies LD1117S50TR in the SOT-223 package. The catalog's original TO-261-4, TO-261AA designation represents the same package family; the registered package image uses TO-261-4.
- Use the current ST SOT-223 mechanical drawing and confirm top-view orientation.
- Treat the large tab as VOUT electrically.
- Provide output-connected copper area appropriate for the expected dissipation.
- Place the stabilization capacitor close to VOUT and ground.
The registered JPG is checked locally and in production before publication.
Pin Functions
The fixed-output SOT-223 assignment below follows the ST top-view convention.
The tab is VOUT rather than ground. Verify this connection before reusing a generic SOT-223 footprint.
Key Specifications
| Manufacturer | STMicroelectronics |
|---|---|
| Regulator type | Fixed positive low-dropout linear regulator |
| Nominal output | 5.0 V |
| Output at 25 degrees C | 4.95 V minimum, 5.00 V typical, 5.05 V maximum |
| Output over stated line and load range | 4.9 V minimum, 5.1 V maximum; 0 to 800 mA, 6.5 to 15 V input |
| Output current | 800 mA minimum under the stated test condition |
| Operating input voltage | Up to 15 V at 100 mA |
| Dropout at 800 mA | 1.10 V typical, 1.2 V maximum |
| Quiescent current | 5 mA typical, 10 mA maximum |
| Line regulation | 1 mV typical, 10 mV maximum; 6.5 to 15 V input at no load |
| Load regulation | 1 mV typical, 15 mV maximum; 0 to 800 mA at 6.5 V input |
| Supply-voltage rejection | 60 dB minimum, 75 dB typical at 120 Hz under the stated condition |
| Operating junction temperature | 0 degrees C to +125 degrees C |
| Thermal resistance, junction-to-case | 15 degrees C/W for SOT-223 |
| Package and packing | SOT-223 / TO-261-4 family, tape and reel |
ST's LD1117#50 electrical table uses a 10 microfarad output capacitor and specifies the individual line, load, and temperature conditions for each limit.
Replacement Considerations
A replacement must preserve the fixed 5.0 V output, required load current, SOT-223 footprint, GND/VOUT/VIN pin order, output-connected tab, dropout limit, capacitor stability, protection behavior, and 0 to +125 degrees C range. The LD1117S50CTR order code is a different C-suffix version with different datasheet limits and is not an unconditional specification-equivalent substitute.
No internal replacement link is asserted without an exact API-confirmed catalog match and engineering review.
Manufacturer Information
STMicroelectronics lists LD1117S50TR as active and in volume production. The S package designator corresponds to SOT-223, 50 identifies the 5.0 V fixed output, and TR denotes tape-and-reel packing. The exact product is classified as industrial grade and Ecopack2 compliant.
Applications
Point-of-load rails
Generate a local 5 V rail near digital or mixed-signal circuitry.
Computer peripherals
Supply moderate-current logic and interface rails where dissipation is controlled.
Industrial controls
Regulate auxiliary rails in controllers, sensors, and interface modules.
General power conversion
Add a protected linear post-regulation stage after a higher DC supply.
Quality & Authenticity
Confirm the exact LD1117S50TR order code, package marking, SOT-223 dimensions, reel label, lead finish, and lot traceability during incoming inspection. Package appearance alone does not establish authenticity. Electrical sampling should use the latest ST limits for the non-C order code.
FAQ
What output voltage does LD1117S50TR provide?
It is the fixed 5.0 V SOT-223 member of ST's LD1117 family.
Can it continuously deliver 800 mA?
Only when input headroom, PCB copper, ambient temperature, and junction temperature permit.
What is the SOT-223 pin order?
For the fixed version in top view, pin 1 is GND, pin 2 is VOUT, and pin 3 is VIN; the tab is also VOUT.
What output capacitor is required?
ST states that a common 10 microfarad minimum output capacitor is needed for stability.
What temperature range applies?
The exact non-C orderable product is specified from 0 degrees C to +125 degrees C.
Engineering Notice
Validate dropout margin, startup and load transients, capacitor characteristics, tab routing, and junction temperature in the final circuit. Power dissipation rises approximately with (VIN minus 5.0 V) multiplied by load current, so thermal constraints can limit usable current before other electrical limits are reached.
LD1117S50TR Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
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