TX4120XH from XDS, in a SOT-23-6. 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	FB	input	Feedback input. Senses the output voltage via an external resistor divider between VOUT and GND. High-impedance sensitive node; route away from SW and BST. When CS is floating or tied to VOUT, FB is connected directly to VOUT because the internal divider sets the output voltage.
2	GND	power_in	Ground return for the IC and the low-side power switch.
3	VIN	power_in	Supply input to the IC. Accepts 4.5V to 36V (recommended 6.5V-30V, absolute max 36V; 33V input OVP). Bypass with a large bulk capacitor and at least one 0.1µF ceramic capacitor close to the VIN and GND pins to suppress input noise.
4	SW	output	Power switch node. Connects to the switching node of the external inductor (junction of the high-side and low-side integrated MOSFETs). Absolute max range −1V to VIN+0.3V.
5	BST	passive	Bootstrap pin for the high-side gate driver. Connect a 0.1µF (or larger) capacitor between SW and BST to supply the high-side MOSFET gate driver. Absolute max VBST−VSW = 6V.
6	CS	input	Current-sense input and mode-select pin. Connect a 10mΩ-100mΩ sense resistor between CS and GND to program the output current limit and enable CC-loop operation (Mode 1); the R1 in Figure 1 can be used for programmed line-drop compensation. Alternatively tie CS to VOUT or leave floating (Mode 0) to disable the CC loop and line-drop compensation - the internal divider then automatically sets VOUT to ~5.1V for minimum external components.

Key specifications

Parameter	Value
Manufacturer	XDS
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

TX4120xH

CAD (KiCad official)

Symbol: TX4120XH
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tx4120xh.step`	97 KB	You want the bare part, or you mark your own boards.
`tx4120xh-etched.step`	1.3 MB	You want the part with `TX4120XH` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 354 faces against 117 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: XDS datasheet (10 pp, sha256 69eb4c5e6d0742b5, 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