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ST LD1117S18TR

Linear Voltage Regulator IC Positive Fixed 1 Output 800mA SOT-223

Ovaga Certification

Brands: STMicroelectronics, Inc

Mfr.Part #: LD1117S18TR

Datasheet: LD1117S18TR Datasheet (PDF)

Package/Case: SOT-223

Product Type: Power Management ICs

RoHS Status:

Stock Condition: 3312 pcs, New Original

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LD1117S18TR General Description

The LD1117 is a low drop voltage regulator able to provide up to 800 mA of output current, available even in adjustable version (VREF= 1.25 V). Concerning fixed versions, are offered the following output voltages: 1.2 V, 1.8 V, 2.5 V, 2.85 V, 3.3 V and 5.0 V. The device is supplied in: SOT-223, DPAK, SO-8 and TO-220. The SOT-223 and DPAK surface mount packages optimize the thermal characteristics even offering a relevant space saving effect. High efficiency is assured by NPN pass transistor. In fact in this case, unlike than PNP one, the quiescent current flows mostly into the load. Only a very common 10 μF minimum capacitor is needed for stability. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 1 % at 25 °C. The adjustable LD1117 is pin to pin compatible with the other standard. Adjustable voltage regulators maintaining the better performances in terms of drop and tolerance.



  • Low dropout voltage (1 V typ.)
  • 2.85 V device performances are suitable for SCSI-2 active termination
  • Output current up to 800 mA
  • Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V
  • Adjustable version availability (VREF= 1.25 V)
  • Internal current and thermal limit
  • Available in ± 1 % (at 25 °C) and 2 % in full temperature range
  • Supply voltage rejection: 75 dB (typ.)


Parameter Value Parameter Value
feature-type LDO feature-maximum-power-dissipation-mw 12000
feature-packaging Tape and Reel feature-rad-hard
feature-pin-count 4 feature-supplier-package SOT-223
feature-standard-package-name1 SOT feature-cecc-qualified No
feature-esd-protection feature-escc-qualified
feature-military No feature-aec-qualified No
feature-aec-qualified-number feature-auto-motive No
feature-p-pap No feature-eccn-code EAR99


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1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

  • ESD
  • ESD

Datasheet PDF

Preliminary Specification LD1117S18TR PDF Download

Key points

  • The LD1117S18TR is a voltage regulator chip designed to provide a regulated output voltage from a higher input voltage. It has a fixed output voltage of 1.8 volts and can handle a maximum output current of 800 milliamperes. This chip is commonly used in electronic devices that require a stable voltage supply, such as microcontrollers, sensors, and other low-power applications.
  • Equivalent

    Some equivalent products of the LD1117S18TR chip are the AMS1117-1.8, MCP1825S-1802E/DB and LMS1587-1.8.
  • Features

    The LD1117S18TR is a low dropout linear voltage regulator with a fixed 1.8V output voltage. It has a maximum output current of 800mA and a dropout voltage of 1.2V at 800mA. The regulator has thermal overload protection, short-circuit protection, and comes in a surface mount package.
  • Pinout

    The LD1117S18TR is a 3-terminal voltage regulator. It has a pin count of 3 which includes the input, ground, and output pins. The function of this regulator is to provide a fixed 1.8V output voltage when a higher input voltage is supplied.
  • Manufacturer

    STMicroelectronics is the manufacturer of the LD1117S18TR. It is a global semiconductor company specializing in designing, manufacturing, and marketing a variety of integrated circuits and discrete devices, catering to various industries such as automotive, industrial, personal electronics, and more.
  • Application Field

    The LD1117S18TR is a voltage regulator, commonly used in various electronic devices, including but not limited to: 1. Power supplies. 2. Home appliances. 3. Industrial equipment. 4. Consumer electronics. 5. Automotive applications. 6. Battery-powered devices. 7. Control systems. 8. Audio equipment. 9. Communication devices. 10. Medical devices.
  • Package

    The LD1117S18TR chip has a surface mount package type called SOT-223. It comes in the form of a small rectangular plastic package with three pins. The size of the package is approximately 6.7mm x 6.7mm.

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