RH6618T from RONGHE 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	VDD	power_in	Positive supply. Operating range 2.4V to 5.5V (absolute max -0.3V to 5.5V). Bypass with 10uF + 0.1uF close to the pin.
2	GND	power_in	Negative supply / ground reference.
3	CMOD	bidirectional	Sampling capacitor pin. Connect Cm (typ. 15nF; recommended 2.2nF~47nF, up to 1uF) between CMOD and GND to set touch sensitivity. Use a low-tempco X7R/NPO capacitor and place away from heat sources.
4	POUT	output	Push-pull CMOS PWM output driving the external LED transistor. PWM frequency 25kHz (step-less) or 33kHz (3-level). Drive strength ~65mA IOL @ VDD=5V (VOL=0.3VDD), ~32mA IOH @ VDD=5V (VOH=0.7VDD).
5	MOD1	input	Mode configuration bit 1 with internal pull-up (CMOS input, default high). Tie to VDD (1) for step-less dimming with brightness memory (gradual on/off), or to GND (0) for 3-level dimming (OFF/MIN/MID/MAX cycle).
6	TCH	bidirectional	Touch input. Connect to the capacitive touch electrode via a series resistor Rs (recommended >=5.1k) for improved noise immunity. First-touch response ~200ms; subsequent touches ~80ms in fast mode.

Key specifications

Parameter	Value
Manufacturer	RONGHE Microelectronics
Package	SOT-23-6
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

RH6618T
RH6618A
RH6618B

CAD (KiCad official)

Symbol: RH6618T
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
`rh6618t.step`	97 KB	You want the bare part, or you mark your own boards.
`rh6618t-etched.step`	1.6 MB	You want the part with `RH6618T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 398 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: RONGHE Microelectronics datasheet (11 pp, sha256 b355c24c880eb4b8, 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