component
LM7818L-TA3-T
Public Made by Adomby adom
UTC(Unisonic Tech) Linear Voltage Regulators (LDO), TO-220. 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
markdownLM7818L-TA3-T
UTC(Unisonic Tech) · Linear Voltage Regulators (LDO) · TO-220
LM7818L-TA3-T from UTC(Unisonic Tech), in a TO-220. 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 | INPUT | power_in | Unregulated input voltage pin; absolute maximum 35 V for 5-18 V output versions (LM7818 variant), with VIN of 21V to 33V specified for the 18 V output. |
| 2 | GND | power_in | Ground pin, which must be the minimum potential in all operating conditions. |
| 3 | OUTPUT | power_out | Regulated 18 V output (17.28 V to 18.72 V at 25°C) delivering up to 1 A, with a maximum recommended output capacitance of 1000 μF. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC(Unisonic Tech) |
| Package | TO-220 |
| Category | Power Supply Chip |
| 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 | 17.28 | 18 | 18.72 | V | TJ=25°C, IOUT=5mA ~ 1.0A, VIN=27V | 7 |
| Output Voltage (full range) | VOUT | 17.1 | 18.9 | V | VIN=21V ~ 33V, IOUT=5mA ~ 1.0A, PD≤15W | 7 | |
| Dropout Voltage | VD | 2 | V | TJ=25°C | 7 | ||
| Load Regulation | VOUT | 180 | mV | TJ=25°C, IOUT=5mA ~ 1.0A | 7 | ||
| Load Regulation | VOUT | 90 | mV | TJ=25°C, IOUT=0.25A ~ 0.75A | 7 | ||
| Line Regulation | VOUT | 180 | mV | VIN=21V ~ 33V, TJ=25°C | 7 | ||
| Quiescent Current | IQ | 8 | mA | TJ=25°C, IOUT≤1.0A | 7 | ||
| Quiescent Current Change | IQ | 1 | mA | VIN=21.5V ~ 33V | 7 | ||
| Quiescent Current Change | IQ | 0.5 | mA | IOUT=5mA ~ 1.0A | 7 | ||
| Ripple Rejection | RR | 50 | 69 | dB | VIN=22V ~ 32V, f=120Hz, TJ=25°C | 7 | |
| Output Noise Voltage | eN | 110 | μV | 10Hz≤f≤100kHz | 7 | ||
| Peak Output Current | IPEAK | 1.8 | A | TJ=25°C | 7 | ||
| Input Voltage | VIN | 35 | V | VOUT=5~18V | 4 | ||
| Output Current | IOUT | 1 | A | 4 | |||
| Junction Temperature | TJ | 150 | °C | 4 | |||
| Operating Temperature | TOPR | -40 | 125 | °C | 4 | ||
| Storage Temperature | TSTG | -55 | 150 | °C | 4 | ||
| Thermal Resistance Junction to Ambient | θJA | 65 | °C/W | TO-220 | 4 | ||
| Thermal Resistance Junction to Case | θJC | 5 | °C/W | TO-220 | 4 |
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 | Notes: 1.The Maximum steady state usable output current are dependent on input voltage, heat sinking, lead length of the package and copper pattern of PCB. The data above represents pulse test conditi | 8 |
CAD (KiCad official)
- Symbol:
LM7818L-TA3-T - Footprint:
Package_TO_SOT_THT:TO-220-3_Vertical - 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files:
lm7818l-ta3-t-etched.step/lm7818l-ta3-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm7818l-ta3-t.step/lm7818l-ta3-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC(Unisonic Tech) datasheet (12 pp, sha256
992fdafd72d0cee3, retrieved 2026-10-22, 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).