HT431CRZ from HTCSEMI, 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	REF	input	Reference input. High-impedance sense input compared internally against the 2.495 V bandgap. Cathode current is regulated so that V(REF) tracks VREF (~2.495 V). Typical reference input current 1.8 µA (max 4 µA).
2	CATHODE	power_in	Cathode (K). Regulated shunt terminal; sinks current from the load to hold V(REF) equal to the internal 2.495 V reference. Absolute max VKA = 44 V, IK continuous −100 to +150 mA, minimum current for regulation 0.5 mA (max).
3	ANODE	power_in	Anode (A). Common/return terminal, normally tied to circuit ground (or the low side of the sense divider). Carries the sum of cathode and reference currents.

Key specifications

Parameter	Value
Manufacturer	HTCSEMI
Package	SOP-8
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

HT431CRZ

CAD (KiCad official)

Symbol: HT431CRZ
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
`ht431crz.step`	122 KB	You want the bare part, or you mark your own boards.
`ht431crz-etched.step`	1.6 MB	You want the part with `HT431CRZ` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 407 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: HTCSEMI datasheet (6 pp, sha256 0717f21d1e892efe, 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