component

LM2596R-3.3

Public Unreviewed

by Ray

HTC Korea TAEJIN Tech LM2596R 3 3 DC-DC Converters, TO-263-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Contents

README

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LM2596R-3.3

HTC Korea TAEJIN Tech · DC-DC Converters · TO-263-5

LM2596R-3.3 from HTC Korea TAEJIN Tech, in a TO-263-5. 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 VIN power_in Positive input supply, 4.5V to 40V operating (45V absolute max). Requires a suitable input bypass capacitor (typ. 470uF, 50V aluminum electrolytic) close to the pin to supply the switching currents and suppress voltage transients.
2 VOUT output Emitter of the internal 3A NPN switch (the switching node). Saturation voltage Vsat is typically 1.16V at Iout=3A. Connects to the external inductor and catch diode; keep the copper area small to minimize EMI coupling into sensitive circuitry.
3 GND power_in Circuit ground pin. Should tie into a solid ground plane using short, wide traces along with the input capacitor, output capacitor, and catch diode return paths.
4 FEEDBACK input Senses the regulated output voltage to close the feedback loop. In the fixed 3.3V version this pin connects directly to the regulated 3.3V output; internal R2/R1 divider sets the 3.3V regulation point against the 1.23V internal reference. Feedback bias current is typically 12nA.
5 ON/OFF input TTL-compatible shutdown input. Threshold is typically 1.3V (VIH=2.0V min, VIL=0.6V max). Driving above threshold (up to +Vin) shuts the regulator off, dropping supply current to ~80uA (250uA max). Leaving open or holding below 1.3V enables the regulator. Absolute range -0.3V to +Vin.

Key specifications

Parameter Value
Manufacturer HTC Korea TAEJIN Tech
Package TO-263-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LM2596R-3.3
  • LM2596T-3.3

The extractor listed these alongside LM2596R-3.3, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LM2596R-ADJ
  • LM2596T-ADJ
  • LM2596DP-ADJ

CAD (KiCad official)

  • Symbol: LM2596R-3.3
  • Footprint: Package_TO_SOT_SMD:TO-263-2
  • 3D model: TO-263-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm2596r-3-3.step 180 KB You want the bare part, or you mark your own boards.
lm2596r-3-3-etched.step 2.2 MB You want the part with LM2596R-3.3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 574 faces against 135 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: HTC Korea TAEJIN Tech datasheet (8 pp, sha256 c89f43dda8481acd, 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