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RT9187BGB

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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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RT9187BGB

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

RT9187BGB 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. Operating range 2.5V to 5.5V (absolute max 6V). Requires >=2.2uF ceramic bypass capacitor within 0.5 inch of the pin.
2 GND power_in Device ground reference return.
3 EN input Chip Enable, active high (TTL-logic-compatible). VIH >= 1.8V enables regulator; VIL <= 0.6V puts the part into shutdown (<0.1uA typ standby). May be tied directly to VIN to keep the regulator always on. Absolute max 6V.
4 ADJ input Output voltage feedback pin for the internal error amplifier (VREF = 0.8V typ). Connect to the midpoint of an external R1/R2 divider from VOUT to GND to set VOUT = 0.8V * (1 + R1/R2). R2 should be <=80kOhm to maintain regulation; IADJ = 10nA typ.
5 VOUT power_out Regulated voltage output, up to 600mA. Requires >=2.2uF low-ESR (>10 mOhm) ceramic capacitor within 0.5 inch of the pin for stability. Dropout 100mV typ at 500mA.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • RT9187BGB

CAD (KiCad official)

  • Symbol: RT9187BGB
  • 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
rt9187bgb.step 85 KB You want the bare part, or you mark your own boards.
rt9187bgb-etched.step 1.9 MB You want the part with RT9187BGB already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 465 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 16a194b7bb59811e, 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