component
78L18G-AB3-R
Public Made by Adomby adom
UTC(Unisonic Tech) Linear Voltage Regulators (LDO), SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdown78L18G-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);78l18g-ab3-r.step/78l18g-ab3-r.glbare 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, primaryclaude-sonnet-5-5(text), consensusclaude-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).