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SCJT1117B-1.8-A

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Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SCJT1117B-1.8-A

Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223

SCJT1117B-1.8-A from Changjing, in a SOT-223. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 ADJ/GND power_in Shared pin labelled ADJ/GND: it is the ground reference for the fixed-output SCJT1117B-1.8-A (the adjust function applies only to the ADJ version, where IAdj is about 50uA per the datasheet).
2 OUTPUT power_out Regulated output of the 1.8V fixed version, which provides up to 1A with 1.3V typical dropout and is protected by current limiting and thermal shutdown.
3 IN power_in Unregulated input supply; the ratings table lists an input voltage of 20 V (absolute ratings) and 15 V (recommended operating conditions), with a 1.3V typical dropout at 1A.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-223
Category Power Management (PMIC)
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output Voltage VO 1.764 1.8 1.836 V IOUT=10mA, VIN=3.8V 3
Output Voltage VO 1.755 1.8 1.845 V 10mA≤IOUT≤1A, 3.3V≤VIN≤12V 3
Line Regulation LNR 0.03 0.2 % IOUT=10mA, 1.5V≤VIN-VOUT≤10.2V 3
Load Regulation LDR 9 36 mV VIN-VOUT=1.5V, 10mA≤IOUT≤1A 3
Minimum Load Current IL 2 10 mA 3
Quiescent Current Iq 2 5 mA VIN=12V 3
Ripple Rejection RR 60 dB f=1kHz, CIN=10μF/25V, COUT=10μF/25V, VIN-VOUT=2V, IOUT=10mA 3
Input Voltage Vi 20 V 2
Operating Junction Temperature Tj -40 150 ℃ 2
Storage Temperature Tstg -40 150 ℃ 2
Lead Temperature (Soldering, 10s) TL 260 ℃ Soldering, 10s 2
ESD Rating Human Body Model HBM 8 kV Human Body Model 2
Input Voltage Vi 15 V 2
Operating Junction Temperature Tj -20 125 ℃ 2
Thermal Resistance from Junction to Ambient RθJA 100 ℃/W 2
Thermal Resistance (SOT-223, as stated in text) 20 °C/W 5
Thermal Resistance (5cm*5cm copper, two sides, as stated in text) 30 °C/W 5cm*5cm copper area, two sides 5
Thermal Resistance (no good heat-dissipation copper, as stated in text) 120 °C/W No good heat dissipation copper area in PCB 5
Reference Temperature Coefficient (bandgap) 100 ppm/°C 4

CAD (KiCad official)

  • Symbol: SCJT1117B-1.8-A
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: scjt1117b-1-8-a-etched.step / scjt1117b-1-8-a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); scjt1117b-1-8-a.step / scjt1117b-1-8-a.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Changjing datasheet (9 pp, sha256 11fe3bf2c0fe51b0, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF