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5.4 × 5.0 mm 4 pins top-emitting

TX1812CXU

5050 · smd · TX1812CXU · TCWIN

1-wire RGB 3.5–5.5 V active

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
5.4 × 5.0 × 1.6 mm4 pins · top
Max current
34.5 mA11.5 mA per channel
PWM
4.5 kHzreset 200 µs
Library support
FastLED WLED Adafruit

The one TX1812 sheet that is clearly a different circuit: version A5 dated 2024-07-18 (the other TX1812 sheets are 2023 A1/A2). Same 5050 outline and pin order as the CXA5/CWCA parts, but 0.3 / 0.9 / 0.9 / 0.3 us timing ±0.05 us, reset at least 200 us, 11.5 mA test current, output-port rating 10 V (the CWCA sheets say 8.5-9.5 V), input thresholds as absolute voltages (high at least 3.1 V, low at most 1.5 V), PWM 4.5 kHz, 0.45 mA static, 2 kV ESD and storage to 150 C. A separate protocol, tx1812-cxu.

Datasheets disagree with the rest of the family: this sheet prints a typical output current of 11.5 mA, not the 12 mA (9.6-14.4) of the CWCA/DWBA sheets, and its timing, reset, threshold and port-rating figures are those of a different part under the same TX1812 name. LCSC lists the package as “SMD-4P,5.4x5mm” where the sheet says 5.0 x 5.4 x 1.6 mm.

The U suffix also appears on a 2017 SKU (TX1812IWCU-F01, see tx1812-2017); no sheet says what U means.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
TX1812CXU-F01 — — — 4 — active 2024-07-18 A5
Sheet lists IO 11.5 mA (single value) and tests optics at IF=11.5 mA. Datasheet 2024-07-18, version A5. LCSC stock 580 on 2026-10-15.

Pinout

TX1812CXU-F01
TX1812CXU 5050 package, top and side viewPin 1 is ringed. pin 1 VDD (power), pin 2 DO (data out), pin 3 GND (ground), pin 4 DIN (data in).11 VDDpower22 DOdata out33 GNDground44 DINdata in5.4 mm overall5.0 mmtop view1.6 mmside view
  • Power
  • Data
  • Ground
  • Pin 1
  • Cut corner

Outline and pin positions checked against the manufacturer datasheet (C7495078 TX1812CXU-F01 rev A5 p4). Pin 1 is top-left, numbering runs counter-clockwise, and the chamfer sits at pin 3 (GND), as in the WS2812B. The sheet marks "+" on the pin 1-2 side and "-" on the pin 3-4 side. Pad sizes read from the drawing; the part spans 5.4 mm across the leads. What this means.

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

Protocol — TX1812CXU

Timings shown from datasheet.

TX1812CXU bit timingTX1812CXU 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 200 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 ≥ 200 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 200 µs source: datasheet

Compatibility

  • protocol compatible SK6805

    The typical timing (300 / 900 / 900 / 300 ns, 200 us reset) equals the OPSCO SK6805-EC15 sheet figures recorded on the sk6805 protocol, with the same 24-bit GRB framing. The numbers coincide; neither sheet claims compatibility, the drive current is 11.5 mA here against 5 mA, and the +-50 ns tolerance is narrower than the SK6805 windows. Not measured. 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.

  • 2024-07-18 datasheet revision TCWIN TX1812CXU-F01 specification cover: date 20240718, version A5 ↗ 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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