SPX3819M5-L-3-0 from MaxLinear, 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	VIN	power_in	Supply input. Operating input voltage range 2.5V to 16V (absolute max -20V to +20V). Recommend a 1µF input capacitor for stability.
2	GND	power_in	Device ground reference.
3	EN	input	Enable input. CMOS-compatible: logic high (VIH ≥ 2V) enables the regulator; logic low or open (VIL ≤ 0.4V) shuts down the device to near-zero current. Absolute max -20V to +20V. May be tied directly to VIN for always-on operation.
4	BYP	passive	Internal reference bypass pin (fixed-output version, SPX3819M5-L-3-0 is fixed 3.0V). Connect a 10nF capacitor to ground to reduce output noise to as low as 40µVRMS. May be left unconnected if low noise is not required; note that BYP capacitor size affects start-up time.
5	VOUT	power_out	Regulated output. Fixed 3.0V ±1% at up to 500mA load. Requires an output capacitor for stability (typ. 1µF ceramic or 2.2µF aluminum electrolytic). Current limit typ. 800mA (max 950mA).

Key specifications

Parameter	Value
Manufacturer	MaxLinear
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

SPX3819M5-L/TR
SPX3819M5-L-1-2/TR
SPX3819M5-L-1-5/TR
SPX3819M5-L-1-8/TR
SPX3819M5-L-2-5/TR
SPX3819M5-L-3-0/TR
SPX3819M5-L-3-3/TR
SPX3819M5-L-5-0/TR
SPX3819R2-L/TR
SPX3819R2-L-1-2/TR
SPX3819S-L/TR
SPX3819S-L-5-0/TR

CAD (KiCad official)

Symbol: SPX3819M5-L-3-0
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
`spx3819m5-l-3-0.step`	85 KB	You want the bare part, or you mark your own boards.
`spx3819m5-l-3-0-etched.step`	2.5 MB	You want the part with `SPX3819M5-L-3-0` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 618 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: MaxLinear datasheet (13 pp, sha256 43b63129331150a2, 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