TLC5940PWPR from Texas Instruments, in a TSSOP-28-EP. 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. Also serves as thermal pad reference return.
2	BLANK	input	Blank all outputs. When BLANK=H, all OUTn are forced OFF and the GS counter is reset. When BLANK=L, OUTn are controlled by grayscale PWM.
3	XLAT	input	Level-triggered latch signal. When XLAT=H, data from the input shift register is written to GS register (VPRG=low) or DC register (VPRG=high). When XLAT=L, register data is held.
4	SCLK	input	Serial data shift clock. Data on SIN is shifted into the input shift register on the rising edge; max 30 MHz.
5	SIN	input	Serial data input to the shift register. CMOS logic levels (VIH ≥ 0.8·VCC).
6	VPRG	input	Multifunction mode-select input. VPRG=GND selects GS mode; VPRG=VCC selects DC mode; VPRG=V(PRG)≈20-23V programs the DC EEPROM (with DCPRG=H). Default EEPROM data is 3Fh.
7	OUT0	output	Constant-current sink output 0. Up to 60 mA (VCC<3.6V) or 120 mA (VCC>3.6V); withstands up to 17 V while off.
8	OUT1	output	Constant-current sink output 1.
9	OUT2	output	Constant-current sink output 2.
10	OUT3	output	Constant-current sink output 3.
11	OUT4	output	Constant-current sink output 4.
12	OUT5	output	Constant-current sink output 5.
13	OUT6	output	Constant-current sink output 6.
14	OUT7	output	Constant-current sink output 7.
15	OUT8	output	Constant-current sink output 8.
16	OUT9	output	Constant-current sink output 9.
17	OUT10	output	Constant-current sink output 10.
18	OUT11	output	Constant-current sink output 11.
19	OUT12	output	Constant-current sink output 12.
20	OUT13	output	Constant-current sink output 13.
21	OUT14	output	Constant-current sink output 14.
22	OUT15	output	Constant-current sink output 15.
23	XERR	output	Error output, open-drain. Asserts low when LOD (LED open detection) or TEF (thermal error flag) is detected. Requires external pull-up.
24	SOUT	output	Serial data output from the shift register (for cascading). CMOS levels.
25	GSCLK	input	Grayscale PWM reference clock; max 30 MHz. Advances the internal 12-bit GS counter.
26	DCPRG	input	Switch DC data input. DCPRG=L connects DC to EEPROM; DCPRG=H connects DC to the DC register. Also controls EEPROM writing when VPRG=V(PRG).
27	IREF	passive	Reference current terminal. External resistor to GND with internal Vref≈1.24 V sets the max constant sink current for all 16 channels.
28	VCC	power_in	Logic supply voltage. VCC range 3 V to 5.5 V (absolute max 6 V).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-28-EP
Category	LED-drv
Pins	28

Ordering variants

Same part, different packaging or reel option.

TLC5940PWPR
TLC5940PWPRNT
TLC5940PWPRRHB

CAD (KiCad official)

Symbol: TLC5940PWPR
Footprint: Package_SO:TSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP2.85x6.7mm
3D model: TSSOP-28-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tlc5940pwpr.step`	569 KB	You want the bare part, or you mark your own boards.
`tlc5940pwpr-etched.step`	2.2 MB	You want the part with `TLC5940PWPR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 595 faces against 183 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: Texas Instruments datasheet (38 pp, sha256 e24af7c1c690b74e, 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