component

UM1660S

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by Ray

Union Semiconductor DC-DC Converters, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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UM1660S

Union Semiconductor · DC-DC Converters · SOT-23-5

UM1660S from Union Semiconductor, 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 SW output Switch node connected to the drain of the internal N-channel power MOSFET. Connect the inductor and the Schottky diode to this pin. Maximum switch voltage 28 V (abs max 30 V).
2 GND power_in Device ground / return for internal circuitry and current-sense resistor. All voltages are referenced to this pin.
3 FB input Feedback pin. Connect to the external resistor divider from VOUT to program the output voltage; internal reference VREF = 1.233 V. Absolute maximum -0.3 V to VIN+0.3 V.
4 EN input Enable input. Drive high (VIH ≥ 1.3 V) to enable the converter; pull to GND (VIL ≤ 0.4 V) to enter shutdown mode (ISD ≈ 1 µA). Must not be left floating. Also accepts a 50 Hz-10 kHz PWM signal for LED brightness dimming.
5 VIN power_in Supply voltage input. Operating range 2.0 V to 6.0 V (absolute maximum 7.0 V). Bypass to GND with a 4.7 µF ceramic capacitor close to the pin.

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • UM1660S
  • UM1660DA

CAD (KiCad official)

  • Symbol: UM1660S
  • 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: Union Semiconductor datasheet (15 pp, sha256 c098777cfcd8350f, 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