component

UC3842-TD

Public Made by Adom

by adom

TDSEMIC DC-DC Converters, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs uc3842-td: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json uc3842-td: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md uc3842-td: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray
uc3842-td-etched.fit.json uc3842-td: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
uc3842-td-etched.glb uc3842-td: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
uc3842-td-etched.step uc3842-td: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
uc3842-td.glb Publish 0.1.0 · Ray
uc3842-td.kicad_mod Publish 0.1.0 · Ray
uc3842-td.kicad_sym Publish 0.1.0 · Ray
uc3842-td.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
uc3842-td.step Publish 0.1.0 · Ray

UC3842-TD

TDSEMIC · DC-DC Converters · SOP-8

UC3842-TD from TDSEMIC, in a SOP-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 COMP output Error amplifier output. Used for external loop compensation via an RC network between COMP and VFB (pin 2).
2 VFB input Inverting input of the internal error amplifier. Normally connected via a resistor divider from the regulated switching-supply output; compared against the internal 2.5 V reference on the non-inverting input.
3 ISENSE input Current-sense input. Voltage proportional to primary-side switch current (across a sense resistor Rs) is applied here. PWM latch resets when this input exceeds the internal 1 V threshold, providing cycle-by-cycle current limiting.
4 RT/CT passive Oscillator timing pin. Connect RT from VREF (pin 8) to this pin and CT from this pin to GND to set the oscillator frequency and maximum duty cycle. Maximum operating frequency 500 kHz.
5 GND power_in Signal and power ground return for the IC.
6 OUTPUT output Totem-pole gate driver output for the external power MOSFET. Capable of sourcing/sinking peak currents up to 1 A. Internally clamped by a 22 V zener.
7 VCC power_in Positive supply for the control IC. UVLO turn-on at ~16 V (typ) and turn-off at ~10 V (typ) with ~29 V internal zener clamp. Absolute maximum 30 V. Startup current < 0.5 mA (Ist ≤ 0.3 mA at Vi=14 V).
8 VREF power_out 5 V (±2%) trimmed bandgap reference output. Sources up to ~30 mA (Isc typ -100 mA). Typically feeds the oscillator timing resistor RT to charge CT on pin 4.

Key specifications

Parameter Value
Manufacturer TDSEMIC
Package SOP-8
Category PMIC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • UC3842-TDM/TR
  • UC3842-TDN

CAD (KiCad official)

  • Symbol: UC3842-TD
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: uc3842-td-etched.step / uc3842-td-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3842-td.step / uc3842-td.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
uc3842-td.step 122 KB You want the bare part, or you mark your own boards.
uc3842-td-etched.step 2.0 MB You want the part with UC3842-TD already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 486 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: TDSEMIC datasheet (9 pp, sha256 350281e75156b241, 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