addressable.wiki
4.0 × 2.0 mm 4 pins side-emitting

CT-4020URGBC/H-PT

4020 · smd · Chongtian PT (4020 RGBIC) single-wire IC · Chongtian

1-wire RGB 3.5–5.5 V active

Also sold as CT-4020, 4020 RGBIC

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
4.0 × 2.0 × 1.7 mm4 pins · side
Max current
36 mA12 mA per channel
PWM
—reset 80 µs
Library support
FastLED WLED Adafruit

4.0 x 2.0 x 1.7 mm. The sheet says ‘four-channel constant-current adjustable drive’ (the RGB LED plus fallback pattern) and ‘built-in MCU firmware’; pin VDD abs 3.5-5.5 V, logic input -0.5 to 5.5 V. Pin names are VSS / DO / VDD / DI. LCSC stock 1,880 on 2026-10-15.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
CT-4020URGBC/H-PT — clear — 4 — active 2026-01-23 A2
LCSC C53191418, stock 1,880.

Pinout

CT-4020URGBC/H-PT
CT-4020URGBC/H-PT 4020 package, top and side viewPin 1 is ringed. pin 1 VSS (ground), pin 2 DO (data out), pin 3 VDD (power), pin 4 DI (data in).11 VSS22 DO33 VDD44 DI4.0 mm2.0 mmfront view (lens face)1.7 mm deepside view (end-on, light leaves the right face)
  • Ground
  • Data
  • Power
  • Pin 1

Outline and pin positions checked against the manufacturer datasheet (C53191418 CT-4020URGBC/H-PT A2 p2). Four pads in a row on one 4.0 mm edge, numbered 1 VSS, 2 DO, 3 VDD, 4 DI from the top of the figure. Pad length 0.9 mm and 0.40 / 0.44 mm pad / gap callouts give the 0.84 mm pitch. The side the lens is on is not stated in words. What this means.

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

Protocol — Chongtian PT (4020 RGBIC) single-wire IC

Timings shown from datasheet.

Chongtian PT (4020 RGBIC) single-wire IC bit timingChongtian PT (4020 RGBIC) single-wire IC bit timing: a zero bit is 300 nanoseconds high then 900 low; a one bit is 900 high then 300 low; tolerance plus or minus 50 nanoseconds; reset 80 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 1200 nsbit 1 period 1200 nsT0H 300 ±50 nsT1H 900 ±50 nsT0L 900 ±50 nsT1L 300 ±50 ns"0" bit"1" bit020040060080010001200140016001800200022002400time, ns± tolerance on each falling edge2 · 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 × ~1200 ns ≈ 28.8 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 300 / T0L 900 · T1H 900 / T1L 300 ns · ±50 ns · period 1200 ns · reset 80 µs source: datasheet

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.

  • 2026-01-23 datasheet revision Chongtian CT-4020URGBC/H-PT specification, 'Version A2 date 2026/01/23' ↗ 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.

Was this page useful?

0 people found this useful