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L78L09ACZ-AP

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STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-92-3. Pinout cross-checked by two models against 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
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docs l78l09acz-ap: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers l78l09acz-ap: viewers · Ray 1mo ago
l78l09acz-ap-etched.fit.json l78l09acz-ap: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
l78l09acz-ap-etched.glb l78l09acz-ap: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
l78l09acz-ap-etched.step l78l09acz-ap: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
l78l09acz-ap.glb Publish 0.1.0 · Ray 1mo ago
l78l09acz-ap.kicad_mod Publish 0.1.0 · Ray 1mo ago
l78l09acz-ap.kicad_sym Publish 0.1.0 · Ray 1mo ago
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l78l09acz-ap.step Publish 0.1.0 · Ray 1mo ago
package.json l78l09acz-ap: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json l78l09acz-ap: specified limits as data (metadata.characteristics, 18 rows from the datasheet) · Ray 25d ago
README.md l78l09acz-ap: specified limits as data (metadata.characteristics, 18 rows from the datasheet) · Ray 25d ago

L78L09ACZ-AP

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-92-3

L78L09ACZ-AP from STMicroelectronics, in a TO-92-3. 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 VOUT power_out Regulated 9 V output; 8.64 V min / 9 V typ / 9.36 V max at TJ = 25 °C (±4%), IO up to 100 mA, dropout voltage 1.7 V typical.
2 GND power_in Ground reference; common return for input and output circuits.
3 VIN power_in DC input voltage; operating range 11.5 to 23 V (VI test condition 15 V), absolute maximum 30 V.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-92-3
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 (TJ = 25 °C) VO 8.64 9 9.36 V TJ = 25 °C 19
Output voltage VO 8.55 9.45 V IO = 1 to 40 mA, VI = 11.5 to 23 V 19
Line regulation ΔVO 225 mV VI = 11.5 to 23 V, TJ = 25 °C 19
Line regulation ΔVO 150 mV VI = 12 to 23 V, TJ = 25 °C 19
Load regulation ΔVO 80 mV IO = 1 to 100 mA, TJ = 25 °C 19
Load regulation ΔVO 40 mV IO = 1 to 40 mA, TJ = 25 °C 19
Quiescent current Id 6 mA TJ = 25 °C 19
Quiescent current Id 5.5 mA TJ = 125 °C 19
Quiescent current change ΔId 0.1 mA IO = 1 to 40 mA 19
Quiescent current change ΔId 1.5 mA VI = 12 to 23 V 19
Output noise voltage eN 70 µV B = 10 Hz to 100 kHz, TJ = 25 °C 19
Supply voltage rejection SVR 37 44 dB VI = 12 to 23 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C 19
Dropout voltage Vd 1.7 V 19
DC input voltage VI 30 V VO = 3.3 to 9 V 5
Output current IO 100 mA 5
Storage temperature range TSTG -65 150 °C 5
Operating junction temperature range TOP 0 125 °C for L78LxxAC / L78LxxC 5
Thermal resistance junction-ambient RthJA 200 °C/W TO-92 package 5

CAD (KiCad official)

  • Symbol: L78L09ACZ-AP
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92-3 (KiCad packages3D, STEP)
  • 3D model files: l78l09acz-ap-etched.step / l78l09acz-ap-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); l78l09acz-ap.step / l78l09acz-ap.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (45 pp, sha256 43922ae159face7e, retrieved 2026-09-26, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-sonnet-4-6 (text+vision), consensus claude-opus-4-7 (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).

Datasheet PDF