TM3100 from TM Shenzhen Titan Micro Elec, in a QSOP-24. 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	GND	power_in	Ground return for control logic and constant-current output driver circuits. Connect to system 0 V.
2	SDI	input	Serial data input to the 16-bit shift register (Schmitt-trigger input). Data is clocked in on the rising edge of CLK, MSB last.
3	CLK	input	Serial shift-register clock input (Schmitt-trigger). Data on SDI is shifted on the rising edge; maximum clock frequency 25 MHz.
4	LE	input	Latch enable input (Schmitt-trigger). When LE is HIGH, serial data is transferred from the shift register into the output latches; when LE is LOW the latch data is held. Internal pull-down (RPDWN ≈ 40 kΩ).
5	OUT0	output	Constant-current sink output channel 0 for driving an LED. Programmable 5-35 mA (set by R-EXT); withstands up to 30 V. Outputs may be paralleled to boost current.
6	OUT1	output	Constant-current sink output channel 1. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
7	OUT2	output	Constant-current sink output channel 2. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
8	OUT3	output	Constant-current sink output channel 3. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
9	OUT4	output	Constant-current sink output channel 4. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
10	OUT5	output	Constant-current sink output channel 5. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
11	OUT6	output	Constant-current sink output channel 6. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
12	OUT7	output	Constant-current sink output channel 7. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
13	OUT8	output	Constant-current sink output channel 8. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
14	OUT9	output	Constant-current sink output channel 9. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
15	OUT10	output	Constant-current sink output channel 10. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
16	OUT11	output	Constant-current sink output channel 11. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
17	OUT12	output	Constant-current sink output channel 12. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
18	OUT13	output	Constant-current sink output channel 13. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
19	OUT14	output	Constant-current sink output channel 14. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
20	OUT15	output	Constant-current sink output channel 15. Programmable 5-35 mA via R-EXT, tolerates up to 30 V.
21	OE	input	Output-enable control input (active LOW). When OE is LOW, OUT0-OUT15 sink current; when OE is HIGH, outputs are turned off. Internal pull-up to VDD (RPUP ≈ 40 kΩ).
22	SDO	output	Serial data output from the shift register, updated on the rising edge of CLK. Connect to SDI of the next TM3100 to cascade multiple drivers.
23	R-EXT	passive	Constant-current setting pin. Connect an external resistor (Riref) between R-EXT and GND; output current Iout = (1.20 V / Riref) × 15 (e.g. 600 Ω → 30 mA, 1 kΩ → 18 mA). Internal VIREF ≈ 1.20 V.
24	VDD	power_in	Chip power supply, 4.5-5.5 V (absolute max 6.0 V). Bypass locally with a decoupling capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	TM Shenzhen Titan Micro Elec
Package	QSOP-24
Category	LED-drv
Pins	24

CAD (KiCad official)

Symbol: TM3100
Footprint: Package_SO:QSOP-24_3.9x8.7mm_P0.635mm
3D model: QSOP-24 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: TM Shenzhen Titan Micro Elec datasheet (11 pp, sha256 05ac9a9cf102d8c2, 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