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CJ7909
Public Made by Adomby adom
Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, 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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README
markdownCJ7909
Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220
CJ7909 from Changjing, 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 | GND | power_in | Common ground reference pin for the negative regulator. |
| 2 | IN | power_in | Negative unregulated input; the absolute maximum input voltage Vi is -35 V. |
| 3 | OUT | power_out | Regulated negative output with a nominal value of -9 V (typical Vo range -8.73 V to -9.27 V at TJ=25°C); maximum output current IOM is 1.5 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-220 |
| 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 | -8.73 | -9 | -9.27 | V | -11.5V≤Vi≤-24V, Io=5mA-1A, TJ=25℃ | 1 |
| Output Voltage (second row) | Vo | -8.55 | -9 | -9.45 | V | 1 | |
| Load Regulation | ΔVo | 180 | mV | Io=5mA-1.5A, TJ=25℃ | 1 | ||
| Load Regulation | ΔVo | 80 | mV | Io=250mA-750mA, TJ=25℃ | 1 | ||
| Line Regulation | ΔVo | 140 | mV | -11.5V≤Vi≤-26V, TJ=25℃ | 1 | ||
| Line Regulation | ΔVo | 70 | mV | -13V≤Vi≤-19V, TJ=25℃ | 1 | ||
| Quiescent Current | Iq | 2.6 | mA | 1 | |||
| Quiescent Current Change | ΔIq | 1 | mA | -11.5V≤Vi≤-26V, TJ=25℃ | 1 | ||
| Quiescent Current Change | ΔIq | 0.5 | mA | 5mA≤IO≤1A, TJ=25℃ | 1 | ||
| Ripple Rejection | RR | 54 | 60 | dB | -11.5V≤Vi≤-21.5V, f=120Hz, TJ=25℃ | 1 | |
| Dropout Voltage | Vd | 1.1 | V | Io=1A, TJ=25℃ | 1 | ||
| Operating Junction Temperature Range | TOPR | -40 | 125 | ℃ | 1 | ||
| Storage Temperature Range | TSTG | -65 | 150 | ℃ | 1 | ||
| Input Voltage | Vi | -35 | V | 1 | |||
| Thermal Resistance from Junction to Air | RθJA | 83.3 | ℃/W | 1 | |||
| Continuous Total Dissipation | PD | 1.5 | W | 1 | |||
| Maximum Output Current | IOM | 1.5 | A | 1 |
CAD (KiCad official)
- Symbol:
CJ7909 - Footprint:
Package_TO_SOT_THT:TO-220-3_Vertical - 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files:
cj7909-etched.step/cj7909-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cj7909.step/cj7909.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (3 pp, sha256
e259f45c7ec57a4b, retrieved 2026-10-20, 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).