component
79L09U
Public Made by Adomby adom
CBI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, 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
markdown79L09U
CBI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3
79L09U 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 | GND | power_in | Common ground reference pin of the negative three-terminal regulator. |
| 2 | IN | power_in | Negative unregulated input, with an absolute maximum rating of -30 V; a 0.33 µF input bypass capacitor is recommended close to the regulator. |
| 3 | OUT | power_out | Regulated -9 V output rated for a maximum output current of 0.1 A, with a 0.1 µF output bypass capacitor recommended close to the regulator. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-89-3 |
| Category | Power Management (PMIC) |
| 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 (25℃) | Vo | -8.64 | -9 | -9.36 | V | 25℃ | 1 |
| Output Voltage (Vl -12V to -24V, Io 1mA-40mA) | Vo | -8.55 | -9 | -9.45 | V | -12V≤Vl≤-24V, Io=1mA-40mA | 1 |
| Output Voltage (Io 1mA-70mA, 0-125℃) | Vo | -8.55 | -9 | -9.45 | V | Io=1mA-70mA, 0-125℃ | 1 |
| Input Voltage | Vl | -30 | V | 1 | |||
| Operating Junction Temperature Range | TOPR | 0 | 150 | ℃ | 1 | ||
| Storage Temperature Range | TSTG | -55 | 150 | ℃ | 1 | ||
| Ripple Rejection | RR | 45 | dB | -15V≤Vl≤-24V, f=120Hz, 0-125℃ | 1 | ||
| Dropout Voltage | Vd | 1.7 | V | 25℃ | 1 | ||
| Output Noise Voltage | VN | 58 | uV | 10Hz≤f≤100KHz, 25℃ | 1 | ||
| Quiescent Current Change (Vl -13V to -24V) | △Iq | 1.5 | mA | -13V≤Vl≤-24V, 0-125℃ | 1 | ||
| Quiescent Current Change (1mA to 40mA) | △Iq | 0.1 | mA | 1mA≤Vl≤40mA, 0-125℃ | 1 | ||
| Quiescent Current | Iq | 4.1 | 6 | mA | 25℃ | 1 | |
| Load Regulation (Io 1mA-100mA) | △Vo | 19 | 90 | mV | Io=1mA-100mA, 25℃ | 1 | |
| Load Regulation (Io 1mA-40mA) | △Vo | 11 | 40 | mV | Io=1mA-40mA, 25℃ | 1 | |
| Line Regulation (Vl -12V to -24V) | △Vo | 45 | 175 | mV | -12V≤Vl≤-24V, 25℃ | 1 | |
| Line Regulation (Vl -13V to -24V) | △Vo | 40 | 125 | mV | -13V≤Vl≤-24V, 25℃ | 1 | |
| Maximum Continuous Total Dissipation | PD | 0.5 | W | 1 | |||
| Maximum Output Current | IOM | 0.1 | A | 1 |
CAD (KiCad official)
- Symbol:
79L09U - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
79l09u-etched.step/79l09u-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);79l09u.step/79l09u.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: CBI datasheet (2 pp, sha256
7131df42ebdceb8f, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).