SM2396EK from Shenzhen Sunmoon Micro, in a ESOP-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	VT	input	Line-voltage sampling input. An external resistor divider (typically RH=360k on top, RL to GND) sets the constant-power operating point; the threshold is 1.20 V typical (1.13-1.27 V) at VTRIAC=10 V. Absolute max 8 V.
2	REXT1	passive	OUT-channel current-set resistor pin. IOUT = VREXT1 / Rext1, with VREXT1 ≈ 1.20 V (1.15-1.25 V). Absolute max 8 V.
3	GND	power_in	Device ground reference for the internal bandgap, OTP, and both current sink channels.
4	REXT2	passive	TRIAC-channel current-set resistor pin. ITRIAC = VREXT2 / (Rext1 + Rext2), with VREXT2 ≈ 0.30 V (0.29-0.32 V). Absolute max 8 V.
5	TRIAC	power_in	Combined supply input, constant-current sink output, and TRIAC-detection sense pin. Sinks the bleeder/holding current (up to 50 mA typ, saturating between ~6 V and 13 V depending on setting) and is monitored to determine whether a TRIAC dimmer is present. Absolute max 500 V; OUT_BV / TRIAC withstand ≥ 500 V.
6	NC	unconnected	No connection. Leave floating.
7	OUT	power_in	Main LED constant-current sink output. Sinks up to 260 mA (5-260 mA range) set by REXT1; saturation voltage from 2.0 V @30 mA up to 12.0 V @200 mA. Absolute max 500 V.
8	NC	unconnected	No connection. Leave floating.

Key specifications

Parameter	Value
Manufacturer	Shenzhen Sunmoon Micro
Package	ESOP-8
Category	LED-drv
Pins	8

Ordering variants

Same part, different packaging or reel option.

SM2396EK

CAD (KiCad official)

Symbol: SM2396EK
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
3D model: ESOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sm2396ek.step`	125 KB	You want the bare part, or you mark your own boards.
`sm2396ek-etched.step`	2.0 MB	You want the part with `SM2396EK` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 492 faces against 152 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: Shenzhen Sunmoon Micro datasheet (10 pp, sha256 a7b99f9c55699262, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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