component
78L09U
Public Made by Adomby adom
CBI Linear Voltage Regulators (LDO), SOT-89-3. 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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README
markdown78L09U
CBI · Linear Voltage Regulators (LDO) · SOT-89-3
78L09U from CBI, in a SOT-89-3. 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 9 V output (8.64 V min to 9.36 V max at Tj = 25 °C) with a 0.1 µF output capacitor, delivering 1 mA to 100 mA load. |
| 2 | GND | power_in | Ground reference pin common to input and output, with quiescent current of 6 mA max at Tj = 25 °C. |
| 3 | IN | power_in | Unregulated input with absolute maximum rating of 35 V, used with a 0.33 µF input capacitor and 15 V typical test condition. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-89-3 |
| 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 (Tj = 25 C) | VO | 8.64 | 9 | 9.36 | V | Tj = 25 C | 1 |
| Output Voltage | VO | 8.55 | 9.45 | V | 11.4 V <= VI <= 24 V, 1 mA <= IO <= 40 mA | 1 | |
| Line Regulation | Regline | 200 | mV | 11.4 V <= VI <= 24 V, Tj = 25 C | 1 | ||
| Line Regulation | Regline | 160 | mV | 12 V <= VI <= 24 V, Tj = 25 C | 1 | ||
| Load Regulation | Regload | 90 | mV | 1 mA <= IO <= 100 mA, Tj = 25 C | 1 | ||
| Load Regulation | Regload | 45 | mV | 1 mA <= IO <= 40 mA, Tj = 25 C | 1 | ||
| Quiescent Current | IQ | 6 | mA | Tj = 25 C | 1 | ||
| Quiescent Current Change | ΔIQ | 1.5 | mA | 12 V <= VI <= 24 V, IO = 40 mA | 1 | ||
| Quiescent Current Change | ΔIQ | 0.1 | mA | VI = 15 V, 1 mA <= IO <= 40 mA | 1 | ||
| Ripple Rejection | RR | 38 | dB | f = 120 Hz, 12 V <= VI <= 24 V, Tj = 25 C | 1 | ||
| Input Voltage | VI | 35 | V | 1 | |||
| Power Dissipation | Ptot | 800 | mW | 15 mm X 25 mm X 0.7 mm alumina ceramic board, Ta <= 25 C | 1 | ||
| Operating Temperature | Topr | -20 | 120 | C | 1 | ||
| Storage Temperature Range | Tstg | -55 | 150 | C | 1 |
CAD (KiCad official)
- Symbol:
78L09U - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
78l09u-etched.step/78l09u-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);78l09u.step/78l09u.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: CBI datasheet (2 pp, sha256
5114a71dbc0fedcf, retrieved 2026-11-05, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).