TM1805 from TM Shenzhen Titan Micro Elec, 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	VDD24V	power_in	Built-in 24V shunt (zener) regulator input. Requires an external series resistor and filter capacitor for resistor-capacitor (dropper) supply operation. Typical VZ24 ≈ 23V with a 300Ω series resistor.
2	VDD	power_in	Chip logic supply input with built-in 5V shunt regulator. Recommended operating range 3.3-6.0V, typical 5.0V; typical no-load current 0.25mA.
3	FIN	input	Frequency input for pattern-change timing and inter-chip synchronization. Accepts <4kHz sine/square/triangle, amplitude 3.5-5V. Tied to VDD or GND holds the current pattern; leaving it floating produces undefined behavior. VHIN ≈ 3.4V, VLIN ≈ 1.5V.
4	SET	input	Display mode select. Floating: jump + fade sequence. Tied to VDD: jump-only cycle. Tied to GND: fade-only cycle. Typical sink current 15µA at 5V.
5	B	output	Blue channel open-drain N-MOS output. Constant-voltage LED driver rated to 24V, typical sink current 82mA at VOUTn=1.2V, on-resistance ≈14Ω. PWM frequency ≈17.8kHz.
6	G	output	Green channel open-drain N-MOS output. Constant-voltage LED driver rated to 24V, typical sink current 82mA at VOUTn=1.2V, on-resistance ≈14Ω. PWM frequency ≈17.8kHz.
7	R	output	Red channel open-drain N-MOS output. Constant-voltage LED driver rated to 24V, typical sink current 82mA at VOUTn=1.2V, on-resistance ≈14Ω. PWM frequency ≈17.8kHz.
8	GND	power_in	Logic ground reference. All voltages are measured with respect to this pin.

Key specifications

Parameter	Value
Manufacturer	TM Shenzhen Titan Micro Elec
Package	SOP-8
Category	LED-drv
Pins	8

CAD (KiCad official)

Symbol: TM1805
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
`tm1805.step`	122 KB	You want the bare part, or you mark your own boards.
`tm1805-etched.step`	1.5 MB	You want the part with `TM1805` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 375 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: TM Shenzhen Titan Micro Elec datasheet (8 pp, sha256 b8c70f77b97f828f, 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