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um3510s

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by Ray

Union Semiconductor DC-DC Converters, SOT-23-6. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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UM3510S

Union Semiconductor · DC-DC Converters · SOT-23-6

UM3510S from Union Semiconductor, in a SOT-23-6. 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 FB input Feedback input pin. Connect FB to the center point of the external resistor divider that sets VOUT. Internal reference VREF is typically 0.600V (0.588V min / 0.612V max at TA=+25°C); FB input bias current is up to 30nA at VFB=0.65V.
2 MODE input Mode select input. MODE=high forces fixed-frequency PWM operation; MODE=low enables Power Save Mode with automatic PFM-to-PWM transition. Logic thresholds: VIH ≥ 1.2V, VIL ≤ 0.4V; input leakage ≤ 1μA.
3 SW output Power switch output / inductor node. Connects internally to the drains of the P-CH and N-CH MOSFET switches; tie to the external inductor. Peak SW sink/source current 2.0A absolute max; VSW range -0.3V to VIN+0.3V. RDS(ON) ≈ 0.25Ω (P-CH) / 0.18Ω (N-CH) at VIN=3.6V.
4 GND power_in Device ground reference. Connect to the system ground plane with a short, wide trace and to the input capacitor return.
5 VIN power_in Input supply voltage, 2.5V to 6.0V operating range (absolute max 6.0V). Bypass to GND with a 10μF ceramic (X5R/X7R) capacitor placed as close to the pin as possible. UVLO falling threshold 1.8V-2.3V with 200mV typ hysteresis.
6 EN input Regulator enable input. Drive high to enable the converter; drive low to place the device in shutdown mode (<1μA typ, ISD 0.1μA typ / 1.0μA max at VIN=6.0V). Must be terminated - do not leave floating. Logic thresholds: VIH ≥ 1.2V, VIL ≤ 0.4V.

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SOT-23-6
Category PMIC
Pins 6

Ordering variants

  • UM3510SS
  • UM3510SDA

CAD (KiCad official)

  • Symbol: UM3510S
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Union Semiconductor datasheet (None pp, sha256 b8b0eaf42b996d46, 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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