TJ4320GDP-ADJ from HTC Korea TAEJIN Tech, in a SOP-8-EP. 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	POK	output	Power OK indication. Open-drain output that becomes high impedance once VOUT reaches 92% of its rated value (VPOKTH typ 92%, ~7% hysteresis). Requires an external pull-up resistor.
2	EN	input	Chip enable. Pulling this pin below 0.4 V (VIL) turns the regulator off; VIH ≥ 2.0 V enables the device. Do not float. Enable input current ~0.1 µA (max 1 µA).
3	VIN	power_in	Input supply pin. Recommended operating range 2.5 V to 5.5 V (absolute max 6.5 V). Requires a low-ESR ceramic bypass capacitor (≥10 µF recommended) placed close to the pin.
4	N.C	unconnected	No internal connection. Leave floating or tie to a convenient net; not electrically bonded to the die.
5	SS	passive	Soft-start. Connect an external capacitor (CSS) between this pin and ground to set the soft-start time (e.g. 220 pF ≈ 0.23 ms, 10 nF ≈ 10.4 ms). Internal ~130 nA current source charges CSS against a ~450 kΩ / 0.6 V reference. Do not tie directly to ground.
6	VOUT	power_out	Regulated output voltage, up to 2 A continuous. Requires a low-ESR ceramic output capacitor (≥10 µF recommended). An auto-discharge path (~330 Ω) pulls VOUT down when EN goes low.
7	ADJ	input	Output adjust / feedback input for the adjustable version. Regulates to VADJ ≈ 0.6 V (min 0.582 V, max 0.618 V over temperature). Set VOUT with an external resistor divider using R2 = R1 × (VOUT/0.6 − 1); recommended R1 in the 1 kΩ to 100 kΩ range. A 2.2 nF to 1 µF feed-forward capacitor from VOUT to ADJ improves PSRR.
8	GND	power_in	Device ground / return. Ground pin quiescent current ~0.2 mA at 200 mA load and ~0.3 mA at 2 A load; standby current ~0.1 µA when disabled.
9	PAD	power_in	Exposed thermal pad on the underside of the SOP8-PP package. Must be soldered to a ground copper plane for thermal dissipation and connected to GND electrically.

Key specifications

Parameter	Value
Manufacturer	HTC Korea TAEJIN Tech
Package	SOP-8-EP
Category	PMIC
Pins	9

Ordering variants

Same part, different packaging or reel option.

TJ4320GDP-ADJ
TJ4320GDP-1.0
TJ4320GDP-1.2
TJ4320GDP-1.5
TJ4320GDP-1.8
TJ4320GDP-2.5
TJ4320GDP-3.3
TJ4320GD-1.0
TJ4320GD-1.2
TJ4320GD-1.5
TJ4320GD-1.8
TJ4320GD-2.5
TJ4320GD-3.3

The extractor listed these alongside TJ4320GDP-ADJ, but they are different parts with different electrical characteristics. Do not order them as substitutes.

TJ4320GD-ADJ
TJ4320GRS-ADJ-5L

CAD (KiCad official)

Symbol: TJ4320GDP-ADJ
Footprint: Package_SO:Diodes_SO-8EP
3D model: SOP-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tj4320gdp-adj.step`	194 KB	You want the bare part, or you mark your own boards.
`tj4320gdp-adj-etched.step`	2.0 MB	You want the part with `TJ4320GDP-ADJ` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 521 faces against 63 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: HTC Korea TAEJIN Tech datasheet (20 pp, sha256 9daca42d90860e1b, 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

TJ4320GDP-ADJ

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README