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CJ78L09

Public Made by Adom

by adom

Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3L. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs cj78l09: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers regenerate the viewers (both were 37-byte placeholder stubs, so the page had no working symbol or footprint view) and c… · Ray
cj78l09-etched.fit.json cj78l09: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
cj78l09-etched.glb cj78l09: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
cj78l09-etched.step cj78l09: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
cj78l09.glb Publish 0.1.0 · Ray
cj78l09.kicad_mod Publish 0.1.0 · Ray
cj78l09.kicad_sym Publish 0.1.0 · Ray
cj78l09.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
cj78l09.step Publish 0.1.0 · Ray
package.json Publish 0.2.1 · Ray
pads.json regenerate the viewers (both were 37-byte placeholder stubs, so the page had no working symbol or footprint view) and c… · Ray
page.json Publish 0.2.1 · Ray
README.md cj78l09: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

CJ78L09

Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3L

CJ78L09 from Changjing, in a SOT-89-3L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 OUT power_out Regulated 9.0V output (tolerance ±3% at TJ=25°C, ±5% over operating TJ). Rated for >100mA. Requires ~0.1µF ceramic bypass capacitor to GND.
2 GND power_in Regulator ground / common reference for input and output.
3 IN power_in Unregulated DC input to the device. Maximum VIN = 30V for the CJ78L09 variant. Requires a ~0.33µF ceramic bypass capacitor to GND when the device is more than a few inches from the input filter.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-89-3L
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • CJ78L09
  • CJ78L09-TA

CAD (KiCad official)

  • Symbol: CJ78L09
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3L (KiCad packages3D, STEP)
  • 3D model files: cj78l09-etched.step / cj78l09-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cj78l09.step / cj78l09.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
cj78l09.step 57 KB You want the bare part, or you mark your own boards.
cj78l09-etched.step 1.1 MB You want the part with CJ78L09 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 288 faces against 42 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Changjing datasheet (32 pp, sha256 9262a4d45d64c12c, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF