TLC5973DR from Texas Instruments, in a SOIC-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	OUT0	output	Constant sink current driver output 0. Sinks up to 50 mA (VCC > 4.0 V) programmed by RIREF. OUT pins can withstand up to 21 V; multiple outputs may be tied in parallel to increase drive current.
2	OUT1	output	Constant sink current driver output 1. Sinks up to 50 mA (VCC > 4.0 V) programmed by RIREF. OUT pins can withstand up to 21 V; multiple outputs may be tied in parallel to increase drive current.
3	OUT2	output	Constant sink current driver output 2. Sinks up to 50 mA (VCC > 4.0 V) programmed by RIREF. OUT pins can withstand up to 21 V; multiple outputs may be tied in parallel to increase drive current.
4	GND	power_in	Power ground / network ground reference for all voltages.
5	SDO	output	Serial data output for cascading devices. Push-pull CMOS output (VOH = VCC-0.4 V at IOH = -2 mA, VOL = 0.4 V at IOL = 2 mA). Connects to SDI of the next TLC5973 in the daisy chain.
6	SDI	input	Serial data input for the single-wire EasySet interface (up to 3 Mbps). Internally pulled down to GND via a 1-MOhm (typ) resistor. VIH = 0.7VCC, VIL = 0.3VCC.
7	IREF	bidirectional	Output current programming pin. Connect an external resistor RIREF between IREF and GND to set the constant sink current for OUT0-OUT2 (VIREF = 1.20 V typ; IOUT ≈ 43.4 * 1.20/RIREF mA). Place the resistor close to the device.
8	VCC	power_in	Power-supply voltage input. 3.0 V to 5.5 V in no-shunt-regulator mode, up to 6.0 V with the integrated shunt regulator (IREG up to 20 mA). Absolute maximum 7.0 V.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	LED-drv
Pins	8

Ordering variants

Same part, different packaging or reel option.

TLC5973DR

CAD (KiCad official)

Symbol: TLC5973DR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (37 pp, sha256 8b8bccb8e27ddc91, retrieved 2026-08-17, tier: manufacturer)
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