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CJ78L18C-P3T-ARG

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

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CJ78L18C-P3T-ARG

Changjing · Linear Voltage Regulators (LDO) · SOT-89-3L

CJ78L18C-P3T-ARG from Changjing, in a SOT-89-3L. 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 OUT power_out Regulated 18 V output, 17.46 to 18.54 V at TJ = 25°C for the ±3% grade (this MPN is listed in the ±3% grade table) and at least 100 mA output current; the datasheet recommends a 0.1 µF COUT that should not exceed 20 µF.
2 GND power_in Regulator ground, the reference for CIN (between IN and GND) and COUT (between OUT and GND), which should be placed as close to the pins as possible.
3 IN power_in Input to the device, rated at 35 V maximum for the 18 V version (absolute maximum input voltage 36 V), with a 0.33 µF CIN recommended.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-89-3L
Category Power Management
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
Input voltage VIN 35 V 14
Output voltage (±3% grade) VOUT 17.46 18 18.54 V TJ = 25°C, ±3% grade 14
Output voltage over temperature range VOUT 17.1 18 18.9 V VIN = 20.5 to 33V, TJ = -40 to 125°C, IOUT = 1 to 100mA, PD ≤ 0.75W 14
Output current IOUT 100 mA TJ = 25°C 14
Quiescent current IQ 3 6 mA IOUT = 0mA 14
Quiescent current change (line) ∆IQ 1.5 mA VIN = 22 to 33V, TJ = -40 to 125°C 14
Quiescent current change (load) ∆IQ 0.1 mA IOUT = 1 to 40mA, TJ = -40 to 125°C 14
Dropout voltage VDO 1.7 2 V IOUT = 40mA 14
Dropout voltage VDO 1.8 2.3 V IOUT = 100mA 14
Line regulation ΔVLINE 25 250 mV VIN = 20.5 to 33V 14
Load regulation ΔVLOAD 25 150 mV IOUT = 1 to 100mA 14
Ripple rejection RR 34 39 dB VIN = 21.5 to 31.5V, f = 120Hz 14
Input voltage range (recommended) VIN 35 V CJ78L18C 6
Operating junction temperature TJ -40 125 °C 6
Maximum input voltage VIN MAX 36 V 6
Maximum junction temperature TJ Max 150 °C 6
Storage temperature Tstg -65 150 °C 6
Soldering temperature Tsolder 260 °C 10s 6
Electrostatic discharge, human body model VESD-HBM 2000 V HBM, JESD22-114D, 100pF, 1.5kΩ 7
Electrostatic discharge, machine model VESD-MM 200 V MM, JESD22-115-A, 200pF 7
Junction-to-ambient thermal resistance (SOT-89-3L) RΘJA 121.6 °C/W still air, TA = 25°C, 1 in² FR-4 board, 2 oz copper 7
Junction-to-case thermal resistance (SOT-89-3L) RΘJC 29.4 °C/W 7
Reference maximum power dissipation for continuous operation (SOT-89-3L) PD Ref 0.82 W still air, TA = 25°C, 1 in² FR-4 board, 2 oz copper 7

CAD (KiCad official)

  • Symbol: CJ78L18C-P3T-ARG
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3L (KiCad packages3D, STEP)
  • 3D model files: cj78l18c-p3t-arg-etched.step / cj78l18c-p3t-arg-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cj78l18c-p3t-arg.step / cj78l18c-p3t-arg.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (30 pp, sha256 ccb056fb5d1abe3f, retrieved 2026-10-29, 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