An addressable RGB LED with the controller built into the 5050 package, the WS2812B is the chip behind NeoPixel strips. Red, green, and blue dies plus a control IC sit under one lens, driven by a single data line: the host sends 24 bits of color (8 each for G, R, B) to the first LED on DIN, and each LED latches its own color then forwards the rest of the stream out DOUT to the next one. So a whole strip of hundreds runs from one microcontroller pin. It runs on 5 V and needs only a decoupling capacitor. Four pins: VDD, DOUT, VSS, DIN.

Pinout

Pin	Name	Type	Function
1	VDD	power_in	Power supply for the internal controller and the RGB LED. Absolute range +3.5 to +5.3 V; recommended operating VDD 4.5 to 5.5 V. Decouple with a 100 nF (104) ceramic capacitor per pixel per the reference schematic.
2	DOUT	output	Cascaded serial data output. After latching the first 24-bit color word, the pixel reshapes and re-drives the remaining bit stream out of DOUT to the DIN of the next WS2812B. Transmission delay tPLZ <= 300 ns with CL=15 pF, RL=10 kohm.
3	VSS	power_in	Ground reference (0 V) for the controller and the RGB LED drivers.
4	DIN	input	Serial control-data input using a single-wire NZR protocol at 800 Kbps (bit period TH+TL = 1.25 us +/- 600 ns). VIH >= 0.7VDD, VIL <= 0.3VDD, hysteresis ~0.35 V. A low period >= 50 us is interpreted as the RES/latch (reset) code.

Key specifications

Parameter	Value
Type	Addressable RGB LED (integrated IC)
Color depth	24-bit (8 bit per channel)
Interface	single-wire (DIN to DOUT chain)
Chainable	yes (data reshaped at each LED)
Data rate	800 kbps
Refresh	~400 Hz (30-LED cascade)
Supply voltage	~3.5-5.3 V
Package	SMD-5050 (4-pin PLCC)

Ordering variants

Same part, different packaging or reel option.

WS2812B (5050)
WS2812B-B (reverse-mount 5050)

CAD (KiCad official)

Symbol: LED:WS2812B
Footprint: LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm
3D model: WS2812B 5050 (KiCad packages3D)

Provenance

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

Datasheet: Worldsemi datasheet (5 pp, sha256 670517e400d01f76, 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