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RT9043GB

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by Ray

Richtek Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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RT9043GB

Richtek Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5

RT9043GB from Richtek Tech, in a SOT-23-5. 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 VIN power_in Voltage input supply pin. Operating range 2.2V to 5.5V (absolute max 6V). Bypass with at least 1μF ceramic capacitor placed within 0.5 inch of the pin.
2 GND power_in Ground reference for the regulator. Return input and output capacitors to a clean ground plane.
3 EN input Chip enable, active high. Regulator turns on when VEN > 1.6V and enters shutdown when VEN < 0.6V. EN input current is typically 0.1μA (max 1μA). Absolute max 6V. Tie to VIN if enable is not needed.
4 FB input Output voltage feedback. Connect to the midpoint of an external R1/R2 divider from VOUT to GND. VOUT = VFB × (1 + R1/R2), where VFB = 1.2V (typ). FB pin current is typically 0.1μA (max 1μA).
5 VOUT power_out Regulated voltage output. Supplies up to 400mA with 230mV typical dropout at full load. Current-limited at 650mA (typ). Requires at least 1μF ceramic output capacitor within 0.5 inch of the pin for stability.

Key specifications

Parameter Value
Manufacturer Richtek Tech
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • RT9043GB

CAD (KiCad official)

  • Symbol: RT9043GB
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
rt9043gb.step 85 KB You want the bare part, or you mark your own boards.
rt9043gb-etched.step 1.9 MB You want the part with RT9043GB already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 451 faces against 102 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: Richtek Tech datasheet (8 pp, sha256 647a333b1e55142d, 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