component

L78L05ACZTR

Public Made by Adom

by adom

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-92-2.54mm. 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 l78l05acztr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (pad-position, synthesised, bottom-right) · Ray 1mo ago
l78l05acztr-etched.fit.json l78l05acztr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
l78l05acztr-etched.glb l78l05acztr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
l78l05acztr-etched.step l78l05acztr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
l78l05acztr.glb Publish 0.1.0 · Ray 1mo ago
l78l05acztr.kicad_mod Publish 0.1.0 · Ray 1mo ago
l78l05acztr.kicad_sym Publish 0.1.0 · Ray 1mo ago
l78l05acztr.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect and oval pad as a SQUARE EAGLE smd; this carries the real pad shape across (0 -> 0 rounded pads) and stops dropping geometry drawn on KiCad User.N layers. Attributes, connects, pads and the pin-1 marker are gated against decreasing and are unchanged. · Ray 1mo ago
l78l05acztr.step Publish 0.1.0 · Ray 1mo ago
package.json Publish 0.2.0 · Ray 1mo ago
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (pad-position, synthesised, bottom-right) · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 12d ago
README.md l78l05acztr: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 18d ago

L78L05ACZTR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-92-2.54mm

L78L05ACZTR from STMicroelectronics, in a TO-92-2.54mm. 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 VOUT power_out Regulated +5 V output pin, capable of sourcing up to 100 mA. A 0.1 µF ceramic capacitor to GND is recommended for output stability and transient response.
2 GND power_in Common ground reference for the input and output. On SOT-89 this pin is also the thermal tab, so PCB copper area on this pin dominates junction-to-ambient thermal performance (RthJA ≈ 55 °C/W with 6 cm² Cu).
3 VIN power_in Unregulated positive input voltage. Absolute maximum 30 V for the 5 V output variant; typical operating range gives >2 V of dropout headroom above VOUT. A 0.33 µF input capacitor to GND is recommended, especially if the regulator is located far from the bulk supply capacitor.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-92-2.54mm
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • L78L05ACZTR
  • L78L05ACZTRZ
  • L78L05ACZTRAZ
  • L78L05ACZTRD
  • L78L05ACZTRD13TR

CAD (KiCad official)

  • Symbol: L78L05ACZTR
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92-2.54mm (KiCad packages3D, STEP)
  • 3D model files: l78l05acztr-etched.step / l78l05acztr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); l78l05acztr.step / l78l05acztr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
l78l05acztr.step 27 KB You want the bare part, or you mark your own boards.
l78l05acztr-etched.step 1.5 MB You want the part with L78L05ACZTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 394 faces against 19 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: STMicroelectronics datasheet (45 pp, sha256 43922ae159face7e, retrieved 2026-08-17, tier: manufacturer)
  • 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