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PJ78L09SQ

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by Ray

PJSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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PCB Footprint

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Datasheet

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Contents

README

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PJ78L09SQ

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

PJ78L09SQ from PJSEMI, in a SOT-89. 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 9V output. Typical Vo = 9V (8.55V min / 9.45V max over line/load). Supplies up to 100 mA. A 0.1 µF output capacitor (Co) is recommended for stability.
2 GND power_in Ground reference for the regulator. Also the tab/heat-slug on the SOT-89 package for thermal dissipation.
3 IN power_in Unregulated input supply, up to 30V absolute max. Requires at least Vo + Vdropout (~1.7V typ) for regulation. A 0.33 µF input capacitor (Ci) is recommended.

Key specifications

Parameter Value
Manufacturer PJSEMI
Package SOT-89
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • PJ78L09SQ

CAD (KiCad official)

  • Symbol: PJ78L09SQ
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: PJSEMI datasheet (4 pp, sha256 f31bb15910e6d1a8, 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