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UM1350

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Union Semiconductor LED Drivers, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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UM1350

Union Semiconductor · LED Drivers · SOT-23-5

UM1350 from Union Semiconductor, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 LX output Drain of the internal NDMOS switch, rated for -0.3 to +40 V on LX and a switch output current of 500 mA absolute maximum.
2 GND power_in Ground (0 V) reference for the device.
3 VSET input Multi-function on/off and brightness control: leave floating for nominal current, drive below 0.2 V to turn the output off, drive with 0.3 V to 2.5 V DC or a PWM signal for 12% to 100% (or 1% to 100% below 500 Hz) dimming, with an absolute maximum of -0.3 to +6 V.
4 ISENSE input Connect the current sense resistor RS from this pin to VIN to set the nominal average output current (IOUTnom = 100 mV/RS), with ISENSE voltage rated +0.3 to -5 V relative to VIN.
5 VIN power_in Input supply pin, operating range 6 V to 30 V, with an absolute maximum of -0.3 to +40 V.

Key specifications

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input Voltage Range VIN 6 30 V 3
Input Voltage VIN -0.3 40 V 2
ISENSE Voltage VSENSE -5 0.3 V Printed as +0.3 to -5; Note 2: measured with respect to VIN 2
LX Output Voltage VLX -0.3 40 V 2
Adjust Pin Input Voltage VVSET -0.3 6 V 2
Switch Output Current ILX 500 mA 2
Continuous Power Dissipation PD 0.89 W TA=25°C 2
Operating Junction Temperature TJ -40 120 °C 2
Storage Temperature Range TSTG -55 150 °C 2
Mean Current Sense Threshold Voltage VSENSE 95 100 105 mV VVSET=1.25V; measured on ISENSE pin with respect to VIN 3
Sense Threshold Hysteresis VSENSEHYS -15 15 % Printed as ±15% 3
ISENSE Pin Input Current ISENSE 16 20 μA VSENSE=VIN-0.1 3
Internal Reference Voltage VREF 1.2 1.25 1.3 V Measured on VSET pin with pin floating 3
External Control Voltage Range on VSET Pin for DC Brightness Control VVSET 0.3 2.5 V 3
DC Voltage on VSET Pin to Switch Device from Active (On) to Quiescent (Off) State VVSEToff 0.15 0.2 0.25 V VVSET Falling 3
DC Voltage on VSET Pin to Switch Device from Quiescent (Off) to Active (On) State VVSETon 0.2 0.25 0.3 V VVSET Rising 3
LX Switch 'On' Resistance RLX 0.95 1.8 Ω 3
Continuous LX Switch Current ILXmean 0.37 A 3
LX Switch Leakage Current ILX(leak) 1 μA 3
Quiescent Supply Current with Output Off IINQoff 40 μA VSET pin grounded 3
Quiescent Supply Current with Output Switching IINQon 220 μA VSET pin floating; f=250kHz 3
Internal Regulator Start-up Threshold VSU 4.5 V VIN rising 3

CAD (KiCad official)

  • Symbol: UM1350
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: um1350-etched.step / um1350-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um1350.step / um1350.glb are the bare package body.

Provenance

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

  • Datasheet: Union Semiconductor datasheet (15 pp, sha256 f28c059281820b66, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF