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CJA1117B-1.8

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Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CJA1117B-1.8

Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

CJA1117B-1.8 from Changjing, in a SOT-89-3. 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 Pin 1 is labelled ADJ/GND; on the fixed-output CJA1117B-1.8 it serves as the ground reference, while the adjust function applies only to the ADJ version, and the datasheet gives no separate electrical limit for this pin.
2 OUTPUT power_out Regulated 1.8 V output, specified at 1.764 V to 1.836 V for 10 mA to 1 A load with 3.3 V to 12 V input, with a trimmed current limit of 1 A (typ) at VIN-VOUT = 2 V.
3 IN power_in Unregulated input supply pin with an absolute maximum input voltage of 20 V and a recommended input voltage of 15 V, requiring about 1.3 V (typ) dropout at 1 A.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-89-3
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 (IOUT=10mA, VIN=3.8V) VO 1.773 1.8 1.827 V IOUT=10mA, VIN=3.8V 3
Output Voltage (10mA≤IOUT≤1A, 3.3V≤VIN≤12V) VO 1.764 1.8 1.836 V 10mA≤IOUT≤1A, 3.3V≤VIN≤12V 3
Line Regulation LNR 1 7 mV IOUT=10mA, 1.5V≤VIN -VOUT≤10.2V 3
Load Regulation LDR 7.2 mV VIN-VOUT=1.5V, 10mA≤IOUT≤1A 3
Dropout Voltage VD 1.3 V ΔVREF=1%, IOUT=1.0A 3
Adjust Pin Current 60 120 μA 3
Quiescent Current Iq 5 10 mA VIN= VOUT+1.25V 3
Ripple Rejection RR 60 75 dB f=120Hz,COUT=22μFTantalum, VIN-VOUT=3V, IOUT=1A 3
Current Limit Ilimit 1 A VIN-VOUT=2V 3
Temperature Stability 0.5 % 3
Long-Term Stability 0.3 % TA=125℃, 1000hrs 3
RMS Output Noise (% of VOUT) 0.003 % TA=25℃, 10Hz≤f≤10kHz 3
Thermal Shutdown Hysteresis 25 ℃ 3
Input Voltage (absolute maximum) Vi 20 V 2
Maximum Junction Temperature Tj 150 ℃ 2
Storage Temperature Tstg -55 150 ℃ 2
Lead Temperature (Soldering, 10sec.) TL 260 ℃ Soldering, 10sec. 2
ESD Voltage (Machine Model) VESD 400 V Machine Model 2
Input Voltage (recommended) Vi 15 V 2
Operating Junction Temperature Tj -25 125 ℃ 2
Thermal Resistance from Junction to Ambient RθJA 250 ℃/W 2

CAD (KiCad official)

  • Symbol: CJA1117B-1.8
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: cja1117b-1-8-etched.step / cja1117b-1-8-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cja1117b-1-8.step / cja1117b-1-8.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (6 pp, sha256 fc47d4c515190804, 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