component

79L09

Public Made by Adom

by adom

DOWO Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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79L09

DOWO · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

79L09 from DOWO, in a SOT-89. 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 Ground reference pin, labeled GND on the package pinout, with no separate electrical limit stated in the datasheet.
2 VIN power_in Negative unregulated input rated up to -30 V (absolute maximum input voltage 30 V), with electrical characteristics specified at VI = -15 V and ripple rejection tested from VI = -12 V to -22 V.
3 VOUT power_out Negative regulated output with a nominal -9 V level (8.64 V to 9.36 V at VI = -15 V and IO = 40 mA), and load regulation specified for output currents of 1 mA to 100 mA.

Key specifications

Parameter Value
Manufacturer DOWO
Package SOT-89
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 8.64 9 9.36 V VI=-15V,IO=40mA 2
Line Regulation △VO 27 200 mV VI=-12.5~-24V,IO=40mA 2
Load Regulation △VO 12 90 mV VI=-15V,IO=1~100mA 2
Ripple Rejection RR 38 67 dB VI=-12V to -22V, f=150Hz, IO=40mA, ein=1Vp-p 2
Quiescent Current IQ 2 6 mA VI=-15V,IO=40mA 2
Input Voltage -VI 30 V 1
Junction Temperature TJ 150 °C 1
Storage Temperature Range TSTG -65 150 °C 1
Operating Temperature Range TOPR 0 125 °C 1

CAD (KiCad official)

  • Symbol: 79L09
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: 79l09-etched.step / 79l09-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 79l09.step / 79l09.glb are the bare package body.

Provenance

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

  • Datasheet: DOWO datasheet (4 pp, sha256 e10a20c16fb889f9, retrieved 2026-11-05, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF