Hello! now
tms@lcdchip.com
STMicroelectronics LD1117S33CTR
- Part No.:
- LD1117S33CTR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-261-4, TO-261AA
- Description:
- IC REG LINEAR 3.3V 800MA SOT223
- Quantity:
Unit Price:$0
Ext Price:$0
- Payment:
- Shipping:
Product Details
LD1117S33CTR - 3.3 V, 800 mA Low-Dropout Regulator
STMicroelectronics LD1117S33CTR is a fixed 3.3 V positive linear regulator in a SOT-223 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 data sheet DocID2572 Rev. 38 and the exact manufacturer listing.
Overview
The LD1117S33CTR provides a fixed 3.3 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 3.3 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 3.3 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 LD1117S33CTR 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 | 3.3 V |
| Output at 25 degrees C | 3.267 V minimum, 3.300 V typical, 3.333 V maximum |
| Output over stated line and load range | 3.235 V minimum, 3.365 V maximum |
| 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, 6 mV maximum under the stated 3.3 V test condition |
| Load regulation | 1 mV typical, 10 mV maximum from 0 to 800 mA |
| 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 |
| Package and packing | SOT-223 / TO-261-4 family, tape and reel |
ST's LD1117#33 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 3.3 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. Similar 1117-family parts can differ in electrical limits and capacitor requirements.
No internal replacement link is asserted without an exact API-confirmed catalog match and engineering review.
Manufacturer Information
STMicroelectronics lists LD1117S33CTR as active and in volume production. The S package designator corresponds to SOT-223, 33 identifies the 3.3 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 3.3 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 LD1117S33CTR 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 and test conditions.
FAQ
What output voltage does LD1117S33CTR provide?
It is the fixed 3.3 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 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 3.3 V) multiplied by load current, so thermal constraints can limit usable current before other electrical limits are reached.
LD1117S33CTR 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
- Include Parts
- Popular Search
The following parts include "LD1117S33CTR" in Silicon Labs LD1117S33CTR.
- Part Number
- Manufacturer
- Package
- Description
- MIC5504-1.8YM5-TR Microchip Technology SC-74A, SOT-753 IC REG LINEAR 1.8V 300MA SOT23-5
- MIC5504-3.3YM5-TR Microchip Technology SC-74A, SOT-753 IC REG LINEAR 3.3V 300MA SOT23-5
- MIC5365-3.0YC5-TR Microchip Technology 5-TSSOP, SC-70-5, SOT-353 IC REG LINEAR 3V 150MA SC70-5
- MIC5365-1.8YC5-TR Microchip Technology 5-TSSOP, SC-70-5, SOT-353 IC REG LINEAR 1.8V 150MA SC70-5
- MIC5365-2.5YC5-TR Microchip Technology 5-TSSOP, SC-70-5, SOT-353 IC REG LINEAR 2.5V 150MA SC70-5
- MIC5365-3.3YC5-TR Microchip Technology 5-TSSOP, SC-70-5, SOT-353 IC REG LINEAR 3.3V 150MA SC70-5
- MIC5365-3.3YD5-TR Microchip Technology SOT-23-5 Thin, TSOT-23-5 IC REG LIN 3.3V 150MA TSOT23-5
- MIC5317-3.3YM5-TR Microchip Technology SC-74A, SOT-753 IC REG LINEAR 3.3V 150MA SOT23-5
- TLV1117LV33DCYR Texas Instruments TO-261-4, TO-261AA IC REG LINEAR 3.3V 1A SOT223-4
- MIC5317-3.3YMT-TZ Microchip Technology 4-UDFN Exposed Pad IC REG LINEAR 3.3V 150MA 4DFN
The following parts are popular search parts in Test and Measurement.
Inventory:21,304
Please send an inquiry. Send us your inquiry, and we will respond immediately.
