component
CJ78L18
Public Made by Adomby adom
Changjing 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
markdownCJ78L18
Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3
CJ78L18 from Changjing, 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 output of the 18 V positive regulator, specified at 18 V typical with output current up to 100 mA (IOM 0.1 A maximum). |
| 2 | GND | power_in | Ground (common) terminal for the regulator. |
| 3 | IN | power_in | Unregulated input to the regulator; absolute maximum input voltage is 35 V, and regulation is specified for 20.5 V to 33 V input, with a 0.33 µF input bypass capacitor shown in the typical application. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 | Vo | 17.3 | 18 | 18.7 | V | 25℃ | 1 |
| Output voltage | Vo | 17.1 | 18 | 18.9 | V | 20.5V≤Vi≤33V, Io=1mA-40mA | 1 |
| Ripple rejection | RR | 32 | 36 | dB | 21.5V≤Vi≤31.5V, f=120Hz | 1 | |
| Load regulation | ΔVo | 27 | 180 | mV | Io=1mA-100mA, Vi=26V, 25℃ | 1 | |
| Load regulation | ΔVo | 19 | 90 | mV | Io=1mA-40mA, Vi=26V, 25℃ | 1 | |
| Line regulation | ΔVo | 70 | 360 | mV | 20.5V≤Vi≤33V, Io=40mA, 25℃ | 1 | |
| Line regulation | ΔVo | 64 | 300 | mV | 22V≤Vi≤33V, Io=40mA, 25℃ | 1 | |
| Quiescent current | Iq | 4.7 | 6.5 | mA | 25℃ | 1 | |
| Quiescent current change | ΔIq | 1.5 | mA | 22V≤Vi≤33V, Io=40mA | 1 | ||
| Quiescent current change | ΔIq | 0.1 | mA | 1mA≤Io≤40mA, Vi=26V | 1 | ||
| Dropout voltage | Vd | 1.7 | V | Tj=25℃ | 1 | ||
| Output noise voltage | VN | 89 | μV | 10Hz≤f≤100KHz, 25℃ | 1 | ||
| Input voltage | Vi | 35 | V | 1 | |||
| Operating junction temperature range | TOPR | -25 | 125 | ℃ | 1 | ||
| Storage temperature range | TSTG | -65 | 150 | ℃ | 1 | ||
| Thermal resistance from junction to ambient | RθJA | 166.7 | ℃/W | 1 | |||
| Continuous total dissipation | PD | 0.6 | W | 1 | |||
| Maximum output current | IOM | 0.1 | A | 1 |
CAD (KiCad official)
- Symbol:
CJ78L18 - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
cj78l18-etched.step/cj78l18-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cj78l18.step/cj78l18.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (4 pp, sha256
ff155674cfe05c29, 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).