component

XT1861B502SR-G

Public Unreviewed

by Ray

NATLINEAR DC-DC Converters, SOT-23-5L. 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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XT1861B502SR-G

NATLINEAR · DC-DC Converters · SOT-23-5L

XT1861B502SR-G from NATLINEAR, in a SOT-23-5L. 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 high to enable the boost converter; drive low to disable. CE turn-on threshold typically ~0.6 V (decreasing with temperature per Fig.13). Must not be left floating.
2 VOUT power_out Regulated boost output. Factory-set to 5.0 V for the '50' voltage code of this MPN. Connect the output filter capacitor (COUT, 22 µF recommended) between VOUT and GND. Also serves as the internal high-side synchronous rectifier drain and the feedback sense node.
3 NC unconnected No internal connection. May be left floating or tied to GND for mechanical stability. Present only on the SOT23-5L variant.
4 GND power_in Device ground. Return for input capacitor, output capacitor, and CE reference. Keep the ground return path short and low-impedance for good ripple performance.
5 LX power_out Switch node. Connect the boost inductor (L, 10 µH recommended) between VIN and LX. Internal N-channel low-side switch and synchronous P-channel rectifier are tied here. Peak switch current limit 600 mA (min) / 800 mA (typ) / 1000 mA (max); absolute max 1000 mA. Absolute maximum LX voltage 6.5 V.

Key specifications

Parameter Value
Manufacturer NATLINEAR
Package SOT-23-5L
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • XT1861B502SR-GS
  • XT1861B502SR-GM
  • XT1861B502SR-GV
  • XT1861B502SR-GP
  • XT1861B502SR-GL
  • XT1861B502SR-GT

CAD (KiCad official)

  • Symbol: XT1861B502SR-G
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
xt1861b502sr-g.step 85 KB You want the bare part, or you mark your own boards.
xt1861b502sr-g-etched.step 2.7 MB You want the part with XT1861B502SR-G already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 659 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: NATLINEAR datasheet (12 pp, sha256 6aefb3994990857c, 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