SPX3819M5-L-1-8 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 range +2.5V to +16V (absolute max −20V to +20V). Bypass with a low-ESR input capacitor (typically ≥1µF).
2	GND	power_in	Device ground return. Typical ground pin current 90µA at IL=100µA, rising to ~6.5mA at IL=500mA.
3	EN	input	Enable input, CMOS-compatible. Logic high (VIH ≥ 2V) enables the regulator; logic low (VIL ≤ 0.4V) or open shuts it down. May be tied directly to VIN for always-on operation. Input current 0.01µA typ (2µA max at VIL, 3µA typ / 20µA max at VIH).
4	ADJ/BYP	input	Reference bypass pin on fixed-output versions (this 1.8V variant): connect an optional ~10nF capacitor to GND to significantly reduce output noise (down to ~40µVRMS with CBYP=1µF). Same pin serves as the ADJ feedback input on the adjustable variant, tied to a resistor divider from VOUT (VOUT = 1.235V × [1 + R1/R2]).
5	VOUT	power_out	Regulated output. Fixed 1.8V (±1% initial tolerance, temperature coefficient 57 ppm/°C typ). Delivers up to 500mA; current limit typ 800mA. Requires an output capacitor for stability (≥1µF tantalum or ≥2.2µF aluminum electrolytic recommended).

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-1-8
SPX3819M5-L-1-8/TR
SPX3819S-L-1-8
SPX3819S-L-1-8/TR
SPX3819R2-L-1-8

CAD (KiCad official)

Symbol: SPX3819M5-L-1-8
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-1-8.step`	85 KB	You want the bare part, or you mark your own boards.
`spx3819m5-l-1-8-etched.step`	2.4 MB	You want the part with `SPX3819M5-L-1-8` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 593 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 f5e32d1d3e36da8f, 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