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2.1 × 2.1 mm 4 pins top-emitting

GL2121RGB01H-T

2121 · smd · Guiguang GL2121 (unnamed IC) · Guiguang Light

1-wire RGB 3.5–5.5 V active

Also sold as GL2121RGB01H-T, Guiguang 2121

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
2.1 × 2.1 × 1.0 mm4 pins · top
Max current
—per-channel not recorded
PWM
1.5 kHzreset 80 µs
Library support
FastLED WLED Adafruit

Guiguang’s 2.1 mm pixel. The only GL part whose sheet prints a different timing table (see the GL2121 protocol page) and whose pins run GND, DIN, VDD, DOUT counter-clockwise from the bottom-left - unlike the 5050, 3528 and 6028, which put VDD at pin 1. Only the transparent -T version is listed on LCSC. LCSC stock 5,230.

Datasheets disagree: the absolute-maximum table prints a 0.5-5.5 V supply where the electrical table says 3.5 / 5 / 5.5 V.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
GL2121RGB01H-T — clear — 4 — active 2023-05 PDF
Transparent lens. LCSC stock 5,230 on 2026-10-15.

Pinout

GL2121RGB01H-T
GL2121RGB01H-T 2121 package, top and side viewPin 1 is ringed. pin 1 GND (ground), pin 2 DIN (data in), pin 3 VDD (power), pin 4 DOUT (data out).11 GNDground22 DINdata in33 VDDpower44 DOUTdata out2.1 mm2.1 mmtop view1.0 mmside view
  • Ground
  • Data
  • Power
  • Pin 1

Outline and pin positions checked against the manufacturer datasheet (C51933364 GL2121RGB01H-T spec p3 (appearance and size: top view with numbered pads, bottom view, land pattern)). Numbers printed beside the edge pads: 1 GND bottom-left, 2 DIN bottom-right, 3 VDD top-right, 4 DOUT top-left (counter-clockwise from the bottom-left); the sheet draws no cut corner. Pad sizes from the bottom view (0.90 mm gap between the pad columns, 0.50 mm pad height, 1.50 mm outer span); the land pattern shows 0.8 x 0.6 mm pads 0.8 mm apart. Approximate. What this means.

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

Protocol — Guiguang GL2121 (unnamed IC)

Timings shown from datasheet.

Guiguang GL2121 (unnamed IC) bit timingGuiguang GL2121 (unnamed IC) 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.

  • 2023-05 datasheet revision Guiguang GL2121RGB01H-T specification, release date (发布日期) May 2023 on the cover ↗ month

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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