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78L18G-AB3-R

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

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78L18G-AB3-R

UTC(Unisonic Tech) · Linear Voltage Regulators (LDO) · SOT-89

78L18G-AB3-R from UTC(Unisonic Tech), in a SOT-89. 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 OUTPUT power_out Regulated 18V output (17.64-18.36V at TJ=25°C) delivering up to 100mA, with a recommended 0.1μF bypass capacitor.
2 GND power_in Ground reference pin common to input and output.
3 INPUT power_in Unregulated input voltage, rated up to 35V maximum for 10-18V output versions, with a recommended 0.33μF bypass capacitor.

Key specifications

Parameter Value
Manufacturer UTC(Unisonic Tech)
Package SOT-89
Category Power Management ICs
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 VOUT 17.64 18 18.36 V TJ=25°C 5
Output Voltage VOUT 17.46 18.54 V 21V≤VIN≤33V,IOUT=1mA-40mA 5
Load Regulation ΔVOUT 27 180 mV TJ=25°C, IOUT=1mA-100mA 5
Load Regulation ΔVOUT 19 90 mV TJ=25°C, IOUT=1mA-40mA 5
Line Regulation ΔVOUT 145 300 mV 21V≤VIN≤33V,TJ=25°C 5
Line Regulation ΔVOUT 135 250 mV 22V≤VIN≤33V,TJ=25°C 5
Quiescent Current IQ 2 6 mA VIN=27V,IOUT=0mA,TJ=25°C 5
Quiescent Current Change ΔIQ 1.5 mA 21V≤VIN≤33V 5
Quiescent Current Change ΔIQ 0.1 mA 1mA≤VIN≤40mA 5
Ripple Rejection RR 34 48 dB 23V≤VIN≤33V,f=120Hz,TJ=25°C 5
Output Noise Voltage eN 150 μV 10Hz≤f≤100kHz 5
Temperature Coefficient of VOUT ΔVO/ΔT -1.8 mV/C IOUT=5mA 5
Dropout Voltage VD 1.7 V TJ=25°C 5
Input Voltage VIN 35 V VOUT=10~18V 3
Output Current IOUT 100 mA 3
Power Dissipation SOT-89 PD 350 mW SOT-89 3
Junction Temperature TJ 150 °C 3
Operating Temperature TOPR -40 85 °C 3
Storage Temperature TSTG -55 150 °C 3

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts copper Note 1. The Maximum steady state usable output current is dependent on input voltage, heat sinking, lead length of the package and copper pattern of PCB. 5

CAD (KiCad official)

  • Symbol: 78L18G-AB3-R
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: 78l18g-ab3-r-etched.step / 78l18g-ab3-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 78l18g-ab3-r.step / 78l18g-ab3-r.glb are the bare package body.

Provenance

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

  • Datasheet: UTC(Unisonic Tech) datasheet (8 pp, sha256 019cf0ff8e450efc, retrieved 2026-10-23, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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