component

OC5128

Public Unreviewed

by Ray

OCX LED Drivers, ESOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentled-drvoc5128
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Contents

README

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OC5128

OCX · LED Drivers · ESOP-8

OC5128 from OCX, in a ESOP-8. 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 for the chip. Connect to system ground with a short, wide trace to the current sense resistor return.
2 VDD power_in Chip supply pin. Fed from VIN through an external supply resistor RVDD; an internal shunt regulator clamps VDD at ~5.8V (max clamp current 10mA). UVLO rising threshold 4.1V with 0.4V hysteresis.
3 NC unconnected No connect. Leave floating.
4 SW output Switch node; drain of the internal 100V power MOSFET. Connects to the inductor / freewheeling diode in the buck topology. Absolute maximum voltage 100V. The exposed thermal pad is internally tied to SW.
5 CS input Inductor current sense input. Average CS voltage is regulated to 200mV (192-208mV) across the sense resistor RCS; LED current ILED = 0.2V / RCS. Route to RCS and GND with short, wide traces.
6 MODE input Brightness (dimming) select input with internal ~80kΩ pull-down. Float or tie to GND → full-brightness (100% ILED). Tie to a logic high (VDD) → half-brightness (ILED/2). Absolute max −0.3V to VDD+0.3V.
7 NC unconnected No connect. Leave floating.
8 NC unconnected No connect. Leave floating.

Key specifications

Parameter Value
Manufacturer OCX
Package ESOP-8
Category LED-drv
Pins 8

CAD (KiCad official)

  • Symbol: OC5128
  • Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
  • 3D model: ESOP-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: OCX datasheet (6 pp, sha256 531c4e86661633eb, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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