component
CJ7809B-TFN-ARG
Public Made by Adomby adom
Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2L. 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
markdownCJ7809B-TFN-ARG
Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2L
CJ7809B-TFN-ARG from Changjing, in a TO-252-2L. 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 | IN | power_in | Input of the device; for CJ7809B the recommended input voltage range is up to 29 V, and the absolute maximum input voltage is 36 V. |
| 2 | GND | power_in | Regulator ground; all voltages are referenced to the network ground terminal. |
| 3 | OUT | power_out | Output of the device, rated for an absolute maximum output current of 1.0 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-252-2L |
| 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 (±2% grade) at TJ = 25°C | VOUT | 8.82 | 9 | 9.18 | V | TJ = 25°C, ±2% grade | 13 |
| Output voltage over line, load and temperature | VOUT | 8.65 | 9 | 9.35 | V | IOUT = 5mA to 1A, VIN = 11.5 to 23V, TJ = -40 to 125°C, PD ≤ 15W | 13 |
| Line regulation | ΔVRLINE | 25 | 90 | mV | VIN = 11.5 to 23V, IOUT = 500mA | 13 | |
| Load regulation | ΔVRLOAD | 25 | 100 | mV | VIN = 15V, IOUT = 5mA to 1A | 13 | |
| Quiescent current | IQ | 3.2 | 6 | mA | VIN = 15V, TJ = -40 to 125°C, IOUT = 0mA | 13 | |
| Quiescent current change (load) | ΔIQ | 0.1 | 0.8 | mA | VIN = 15V, IOUT = 5mA to 1A | 13 | |
| Quiescent current change (line) | ΔIQ | 0.3 | 0.8 | mA | VIN = 11.5 to 23V, IOUT = 500mA | 13 | |
| Short circuit current | ISC | 200 | mA | VIN = 35V, TA = 25°C | 13 | ||
| Input voltage range (CJ7809B) | VIN | 29 | V | CJ7809B | 8 | ||
| Operating junction temperature | TJ | -40 | 125 | °C | 8 | ||
| Maximum input voltage range | VIN MAX | 36 | V | All voltages with respect to network ground terminal | 8 | ||
| Maximum output current | IOUT MAX | 1 | A | 8 | |||
| Maximum junction temperature | TJ Max | 150 | °C | 8 | |||
| Storage temperature | Tstg | -65 | 150 | °C | 8 | ||
| Soldering temperature | Tsolder | 260 | °C | 10 s | 8 | ||
| Junction-to-ambient thermal resistance (TO-252-2L) | RΘJA | 78.9 | °C/W | TA = 25°C, soldered on PCB in still air without extra heat dissipation pads | 9 | ||
| Junction-to-case thermal resistance (TO-252-2L) | RΘJC | 5.8 | °C/W | 9 | |||
| Reference maximum power dissipation (TO-252-2L) | PD Ref | 1.25 | W | Continuous operation, TA = 25°C | 9 | ||
| Output voltage temperature coefficient | ΔVOUT / ΔT | 0.72 | mV/°C | 13 | |||
| Output voltage temperature coefficient (normalized) | ΔVOUT / (VOUT × ΔT) | 80 | ppm/°C | 13 | |||
| Output noise voltage | VN | 10 | μV / VO | f = 10 to 100k Hz, TA = 25°C | 13 | ||
| Ripple rejection | RR | 61 | dB | f = 120Hz, VIN = 11.5 to 21.5V, IOUT = 500mA | 13 | ||
| Dropout voltage | VD | 2 | V | IOUT = 1A | 13 | ||
| Output resistance | ROUT | 10 | mΩ | f = 1kHz | 13 | ||
| Peak current | IPK | 2.2 | A | VIN = 15V | 13 |
CAD (KiCad official)
- Symbol:
CJ7809B-TFN-ARG - Footprint:
Package_TO_SOT_SMD:TO-252-2 - 3D model: TO-252-2L (KiCad packages3D, STEP)
- 3D model files:
cj7809b-tfn-arg-etched.step/cj7809b-tfn-arg-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cj7809b-tfn-arg.step/cj7809b-tfn-arg.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (33 pp, sha256
2bf7e0142c58a2c8, 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).