component
TX4140
Public Unreviewedby Ray
XDS DC-DC Converters, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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README
markdownTX4140
XDS · DC-DC Converters · SOP-8
TX4140 from XDS, 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 | FB | input | Feedback input. Senses the regulated output voltage for the internal control loop. Feedback pin input current is ~12 uA (at VFB=4.5V, ILOAD=0A). Absolute maximum FB voltage is 6V. |
| 2 | NC | unconnected | No connect. Leave floating or tie to ground per common practice. |
| 3 | LED | output | LED indicator output. Drives an external status LED; the datasheet cautions to keep the LED from overheating in application. |
| 4 | VIN | power_in | Power supply input. Operating range 8V to 38V, absolute maximum 40V, input protection mode trigger at 32V. Bypass with a low-ESR input capacitor (100 uF typical) placed as close as possible to the pin. |
| 5 | SW | output | Switch node. Output of the internal high-side/low-side synchronous MOSFETs; connect to the external inductor (47 uH typical) and freewheel/output network. Absolute maximum voltage range -0.3V to (VIN + 1V). Pins 5 and 6 are internally tied together and must be joined on the board. |
| 6 | SW | output | Switch node (second lead). Internally connected to pin 5; both must be joined externally to the inductor. Keep the SW trace short and small in area to minimize EMI pickup. |
| 7 | GND | power_in | Ground return. Pins 7 and 8 are internally tied together and must be joined externally. Serves as both signal and power ground reference for the converter. |
| 8 | GND | power_in | Ground return (second lead). Internally connected to pin 7; both must be joined externally to the ground plane. Route with wide/short traces for current handling and thermal dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | XDS |
| Package | SOP-8 |
| Category | PMIC |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
TX4140 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
tx4140.step |
122 KB | You want the bare part, or you mark your own boards. |
tx4140-etched.step |
1.2 MB | You want the part with TX4140 already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 321 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: XDS datasheet (9 pp, sha256
509fb4bba955d260, 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).