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CJT1117B-2.5

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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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CJT1117B-2.5

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

CJT1117B-2.5 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 Ground reference for the fixed-voltage CJT1117B-2.5; on the adjustable version this pin is the ADJ pin, with adjust pin current listed as 60 to 120 µA.
2 OUTPUT power_out Regulated output, 2.5 V nominal, specified as 2.450 V to 2.550 V at 10 mA to 1 A output current and 4 V ≤ VIN ≤ 12 V.
3 IN power_in Input supply to the regulator, with the datasheet giving an absolute maximum VIN of 20 V in one table and 15 V in another.

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 2.463 2.5 2.538 V IOUT=10mA, VIN=4.5V 3
Output Voltage VO 2.45 2.5 2.55 V 10mA≤IOUT≤1A, 4V≤VIN≤12V 3
Line Regulation LNR 7 mV IOUT=10mA, 1.5V≤VIN-VOUT≤9.5V 3
Load Regulation LDR 10 mV VIN-VOUT=1.5V, 10mA≤IOUT≤1A 3
Dropout Voltage VD 1.15 1.3 V ΔVREF=1%, IOUT=1000mA 3
Adjust Pin Current IADJ 60 120 μA 3
Quiescent Current Iq 10 mA VIN=VOUT+1.25V 3
Ripple Rejection RR 60 75 dB f=120Hz, COUT=22μF Tantalum, VIN-VOUT=3V, IOUT=1A 3
Temperature Stability 0.5 % 3
Long-Term Stability 0.3 % TA=125℃, 1000h 3
RMS Output Noise (% of VOUT) 0.003 % TA=25℃, 10Hz≤f≤10kHz 3
Current Limit ILimit 1.2 1.5 A VIN-VOUT=1.5V 3
Thermal Shutdown Temperature TSD 160 °C 3
Thermal Shutdown Hysteresis ΔTSD 25 °C 3
Input Voltage VIN 20 V 2
Maximum Junction Temperature TJ MAX 150 ℃ 2
Storage Temperature TSTG -40 150 ℃ 2
Soldering Temperature & Time Tsolder 260 ℃ 10s 2
Input Voltage VIN 15 V 2
Operating Junction Temperature TJ -40 125 ℃ 2
Operating Ambient Temperature TA -40 85 ℃ 2
Junction-to-ambient thermal resistance RΘJA 100 ℃/W 2
Junction-to-case thermal resistance RΘJC 35 ℃/W 2

CAD (KiCad official)

  • Symbol: CJT1117B-2.5
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: cjt1117b-2-5-etched.step / cjt1117b-2-5-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cjt1117b-2-5.step / cjt1117b-2-5.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (9 pp, sha256 25a9c971517f0761, retrieved 2026-10-20, 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