EUP3458VIR1 from Eutech Microelectronics, 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	BS	passive	High-Side Gate Driver Bootstrap Supply. BS provides power to the gate driver of the internal n-channel MOSFET switch. Connect a 10nF or greater capacitor from SW to BS. Absolute max V_BS = V_SW - 0.3V to V_SW + 6V.
2	GND	power_in	Ground. This pin is the voltage reference for the regulated output voltage. It should be kept away from the D1 and input capacitor for noise prevention.
3	FB	input	Output Feedback Input. FB senses the output voltage to regulate that voltage. Connect FB to an external resistor divider to set the output voltage (V_FB typ = 0.8V). The value of the divider resistors also sets loop bandwidth.
4	EN	input	Enable Input. EN is a logic input that controls the regulator on or off. Drive EN logic high (>=1.5V) to turn on the regulator, and set EN logic low (<=0.4V) to turn it off. Don't leave EN floating. Directly connect EN to IN (or through a resistance) for automatic startup.
5	IN	power_in	Input Supply Pin. IN supplies the power to the IC and the power switch. Connect IN to a 4.5V to 30V power source. Bypass IN to GND with a suitably large value capacitor (e.g. 10µF) to minimize input ripple to the IC.
6	SW	output	Power Switcher Output. Connect the output LC filter from SW to the output. Switching node of the internal 0.3Ω N-channel DMOS; absolute max -1V to V_IN + 0.3V.

Key specifications

Parameter	Value
Manufacturer	Eutech Microelectronics
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

EUP3458VIR1
EUP3458OIR1

CAD (KiCad official)

Symbol: EUP3458VIR1
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
`eup3458vir1.step`	97 KB	You want the bare part, or you mark your own boards.
`eup3458vir1-etched.step`	2.2 MB	You want the part with `EUP3458VIR1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 538 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: Eutech Microelectronics datasheet (11 pp, sha256 6408ba23ca5d1258, 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