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RY2121

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by Ray

RYCHIP AC-DC Controllers and Regulators, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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RY2121

RYCHIP · AC-DC Controllers and Regulators · SOT-23-5

RY2121 from RYCHIP, 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 OUT power_out Switched power output. Delivers input voltage to the load through the internal 80mΩ MOSFET when EN is asserted. Discharged through an internal ~150Ω resistance during shutdown.
2 GND power_in Device ground reference. Also serves as the case position for θJC thermal measurement per the datasheet note.
3 SET input Current-limit programming pin. Connect a resistor RSET from this pin to GND to program the current-limit threshold (e.g. 6.8kΩ ≈ 1.18A typ; range 0.4A to 2A).
4 EN input Active-high ON/OFF control. Pull high (VIH ≥ 1.2V) to enable the switch; pull low (VIL ≤ 0.8V) to disable. Do not leave floating. ENB leakage ≤ 1μA at 5.5V.
5 IN power_in Power supply input, 2.4V to 5.5V. Source for the switched output through the internal power MOSFET. Monitored by the UVLO circuit (VIN_UVLO ≈ 2.3V with 0.1V hysteresis).

Key specifications

Parameter Value
Manufacturer RYCHIP
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • RY212170702013

CAD (KiCad official)

  • Symbol: RY2121
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: RYCHIP datasheet (9 pp, sha256 15aeb628abbe0889, 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