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HX3406

Public Unreviewed

by Ray

HX hengjiaxing DC-DC Converters, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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HX3406

HX hengjiaxing · DC-DC Converters · SOT-23-5

HX3406 from HX hengjiaxing, in a SOT-23-5. 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 CE input Chip enable input. Drive above VCEL (min 1.2V at VIN=5V) to enable the regulator; drive below VCEH (max 0.9V at VIN=5V) to place the device into shutdown (standby current 0-1uA). Absolute max VCE = -0.3V to VIN+0.3V.
2 GND power_in Ground reference for the IC. Connect to the system ground with a low-impedance path; carries the return current for the internal N-channel power MOSFET switching node.
3 LX output Internal power switch output (switching node). Connects to the external inductor (typ 2.2uH). Absolute max current ±1500mA; peak current limit typically 1000mA. P-MOSFET RDSON ~0.35Ω, N-MOSFET RDSON ~0.3Ω at ISW=300mA.
4 VIN power_in Supply input, 1.8V to 5.5V operating range (absolute max 6.5V). Bypass to GND with a 4.7uF ceramic capacitor close to the pin.
5 FB input Output voltage feedback input. Regulates to an internal reference of 0.6V (typ; 0.59-0.61V). Connect to the midpoint of the external R1/R2 divider from VOUT to GND; FB input bias current is <±50nA at VFB=0.65V.

Key specifications

Parameter Value
Manufacturer HX hengjiaxing
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • HX3406AFMR
  • HX3406AFML

CAD (KiCad official)

  • Symbol: HX3406
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
hx3406.step 85 KB You want the bare part, or you mark your own boards.
hx3406-etched.step 1.4 MB You want the part with HX3406 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 339 faces against 102 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: HX hengjiaxing datasheet (6 pp, sha256 67a054e588212fef, 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