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3.8 × 3.8 mm 4 pins top-emitting

XL-3838RGBC-2812B

3838 · smd · Xinglight 2812B (12 mA, 0.25/0.47 us windows, reset 80 us) · Xinglight

1-wire RGB 3.5–5.5 V active

Also sold as XL-3838RGBC-WS2812B

At a glance

Colour
RGB8 bits per channel
Data
1-wiretimed pulses on one line
Supply
3.5–5.5 Vno backup data line
Size
3.8 × 3.8 × 1.1 mm4 pins · top
Max current
36 mA12 mA per channel
PWM
1.5 kHzreset 80 µs
Library support
FastLED WLED Adafruit

The labelled diagram and the outline top view on the same sheet are 180 degrees apart (cut corner top-left vs bottom-right); the labelled diagram is followed.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
XL-3838RGBC-2812B — — — 4 — active 2025-09-08 PDF
LCSC stock 1,500 on 2026-10-15.

Pinout

XL-3838RGBC-2812B
XL-3838RGBC-2812B 3838 package, top and side viewPin 1 is ringed. pin 1 GND (ground), pin 2 DO (data out), pin 3 VDD (power), pin 4 DI (data in).11 GNDground22 DOdata out33 VDDpower44 DIdata in3.8 mm3.8 mmtop view1.1 mmside view
  • Ground
  • Data
  • Power
  • Pin 1
  • Cut corner

Outline and pin positions checked against the manufacturer datasheet (C22464517 XL-3838RGBC-WS2812B p11 (outline, solder pattern, labelled diagram)). Labelled diagram: 1 GND top-right, 2 DO bottom-right, 3 VDD bottom-left, 4 DI top-left, i.e. clockwise from the top-right with the cut corner top-left. Pad shapes are irregular on the sheet (an L and a T of copper); the pads drawn are rectangles estimated from the drawing. The diagram view is rotated 180 degrees from the outline top view (cut corner bottom-right there). What this means.

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

Protocol — Xinglight 2812B (12 mA, 0.25/0.47 us windows, reset 80 us)

Timings shown from datasheet.

Xinglight 2812B (12 mA, 0.25/0.47 us windows, reset 80 us) bit timingXinglight 2812B (12 mA, 0.25/0.47 us windows, reset 80 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

  • protocol compatible WS2812B

    Only the sheet title (XL-3528RGBC-WS2812B, "WS2812B functional characteristics") claims it. The windows (0 code high up to 0.47 us, 1 code high from 0.58 us) bracket the WorldSemi WS2812B values (0.4 / 0.8 us), the symmetric typical column does not. source ↗

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.

  • 2025-09-08 estimate PDF CreationDate metadata of Xinglight sheet XL-3838RGBC-2812B (LCSC C22464517); the sheet has no revision table, so this is only the date the PDF file was produced ↗ day
  • 2025-09-08 estimate PDF CreationDate metadata of Xinglight sheet XL-3528RGBC-2812B (LCSC C5440693); 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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