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2.1 × 2.1 mm 4 pins top-emitting

XL-2121RGBC-2812B

2121 · smd · Xinglight 2812B 2121 (3.0-5.5 V, 12 mA, 0.25/0.3 us) · Xinglight

1-wire RGB 3–5.5 V active

Also sold as XL-2121RGBC-WS2812B

At a glance

Colour
RGB8 bits per channel
Data
1-wiretimed pulses on one line
Supply
3–5.5 Vno backup data line
Size
2.1 × 2.1 × 1.0 mm4 pins · top
Max current
36 mA12 mA per channel
PWM
1.5 kHzreset 80 µs
Library support
FastLED WLED Adafruit

Pin numbering here (DI = 1) differs from the WorldSemi WS2812C-2121 and from the other Xinglight 5050-style sheets.

Variants

One row per orderable SKU. Everything not listed is inherited from the part above.

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
XL-2121RGBC-2812B — — — 4 — active 2026-08-14 PDF
LCSC stock 56,865 on 2026-10-15.
XL-2121RGBC-XS2812B — — — 4 — active 2026-08-14 PDFPDF ↗
XS2812B name, same timing and drawing; LCSC lists the package as 2.1 x 2.1 mm. LCSC stock 2,860 on 2026-10-15.

Pinout

XL-2121RGBC-2812BXL-2121RGBC-XS2812B
XL-2121RGBC-2812B 2121 package, top and side viewPin 1 is ringed. pin 1 DI (data in), pin 2 VDD (power), pin 3 DOUT (data out), pin 4 GND (ground).11 DIdata in22 VDDpower33 DOUTdata out44 GNDground2.1 mm2.1 mmtop view1.0 mmside view
  • Data
  • Power
  • Ground
  • Pin 1
  • Cut corner

Outline and pin positions checked against the manufacturer datasheet (C5349957 XL-2121RGBC-WS2812B p11 (outline, solder pattern, labelled top view); the XS sheet p11 is the same). Counter-clockwise from the bottom-right: 1 DI (at the cut corner), 2 VDD, 3 DOUT, 4 GND. Pads are in the WS2812B corners (VDD top-right) but numbered from DI. Pad sizes estimated from the drawing. What this means.

  1. 1 DI data in
  2. 2 VDD power
  3. 3 DOUT data out
  4. 4 GND ground

Protocol — Xinglight 2812B 2121 (3.0-5.5 V, 12 mA, 0.25/0.3 us)

Timings shown from datasheet.

Xinglight 2812B 2121 (3.0-5.5 V, 12 mA, 0.25/0.3 us) bit timingXinglight 2812B 2121 (3.0-5.5 V, 12 mA, 0.25/0.3 us) bit timing: a zero bit is 250 nanoseconds high then 1000 low; a one bit is 850 high then 400 low; reset 80 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 1250 nsbit 1 period 1250 nsT0H 250 nsT1H 850 nsT0L 1000 nsT1L 400 ns"0" bit"1" bit02505007501000125015001750200022502500time, ns2 · One frame: 24 bits, most-significant bit firstDIN170110010007100110101700101100bitch 1 · 8 bitsch 2 · 8 bitsch 3 · 8 bitsChannel order not recorded for this protocol · frame = 24 × ~1250 ns ≈ 30 µs · example data, first bits 1 0 1 …3 · RESET / latchlast bits of frame 1first bits of frame 2LEDs latch the data they receivedRESET: DIN low ≥ 80 µs (not to scale)4 · Cascade: each DOUT feeds the next DINMCULED 1DINDOUTLED 2DINDOUTLED NDINDOUTLED 1 keeps the first 24 bits, re-shapes the signal and sends the rest out on DOUT;LED 2 keeps the next 24, and so on. The last LED's DOUT is left unconnected.
T0H 250 / T0L 1000 · T1H 850 / T1L 400 ns · period 1250 ns · reset 80 µs source: datasheet

Compatibility

Dating evidence

Nobody announces these parts, so this records what we can actually cite rather than a release date. Library support proves only that the part existed by that date.

  • 2026-08-14 estimate PDF CreationDate metadata of Xinglight sheet XL-2121RGBC-2812B (LCSC C5349957); the sheet has no revision table, so this is only the date the PDF file was produced ↗ day

Where to buy

Stub data — a few rows so purchase links can grow later. Prices are not tracked.

Similar parts

Same protocol or package first, then the same data scheme and colour channels.

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