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RS3221-3.3YF3

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by Ray

Jiangsu RUNIC Tech RS3221 3 3YF3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23. 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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Datasheet

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Contents

README

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RS3221-3.3YF3

Jiangsu RUNIC Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23

RS3221-3.3YF3 from Jiangsu RUNIC Tech, in a SOT-23. 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 GND power_in Ground reference. All voltages in the datasheet are with respect to this pin.
2 OUT power_out Regulator output. Provides regulated 3.3V (fixed) up to 200 mA (current-limited to 300 mA typ). Bypass with a 1μF ceramic capacitor to GND for stability.
3 IN power_in Regulator input. Supply voltage range 1.7V to 7.5V (abs max 8V). Bypass with a 1μF ceramic capacitor to GND.

Key specifications

Parameter Value
Manufacturer Jiangsu RUNIC Tech
Package SOT-23
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • RS3221-3.3YF3
  • RS3221-3.3YF3YUTDN4
  • RS3221-3.3YF3YF5
  • RS3221-3.3YF3ADJCYF5
  • RS3221-3.3YF3YC5
  • RS3221-3.3YF3ADJCYC5
  • RS3221-3.3YF3YE3L

The extractor listed these alongside RS3221-3.3YF3, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • RS3221-3.3YF3ADJ8YF5
  • RS3221-3.3YF3ADJ8YC5

CAD (KiCad official)

  • Symbol: RS3221-3.3YF3
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Jiangsu RUNIC Tech datasheet (15 pp, sha256 d054cc9914df7b3b, 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