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2.0 × 1.7 mm 4 pins top-emitting

TX1812I

2017 · smd · TX1812 · 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
2.0 × 1.7 × 0.8 mm4 pins · top
Max current
—per-channel not recorded
PWM
4 kHzreset 80 µs
Library support
FastLED WLED Adafruit

TX1812 in a 2.0 x 1.7 x 0.85 mm package, five-milliamp. Sheet (TX1812IXA5-F01, version A2, 2023-03-27): pins 1 DO, 2 GND, 3 DIN, 4 VDD, numbered counter-clockwise from the bottom-right pad in the top view; half-moon notched pads at the two 2.0 mm ends; 5 mA per channel. Same pin order and drawing family as TCWIN’s T63 and T65.

TX1812IWCA5-F01 (1,370) and TX1812IWCU-F01 (13,110) have no datasheet on LCSC and are listed by their shared IC code 1812 and package letter I (LCSC package field “SMD-4P,2x1.7mm”); that is an inference. The U suffix is the one used by the TX1812CXU-F01 sheet, whose electricals and timing differ from every other TX1812 sheet (see tx1812cxu-5050), so this SKU may not follow the TX1812 timing shown for the part; no sheet settles it.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
TX1812IXA5-F01 — — — 4 — active 2023-03-27 A2
5 mA per channel. LCSC stock 730 on 2026-10-15.
TX1812IWCA5-F01 — — — 4 — active 2023-03-27 A2
No datasheet is listed on LCSC for this SKU. Package, pin order and drawing are taken from the sibling sheet TX1812IXA5-F01 because both share IC code 1812 and package letter I; that is an inference from the part number, not something any sheet states. Drive current, timing window and the meaning of the remaining letters are not confirmed for this SKU. LCSC stock 1,370 on 2026-10-15.
TX1812IWCU-F01 — — — 4 — active 2023-03-27 A2
No datasheet is listed on LCSC for this SKU. Package, pin order and drawing are taken from the sibling sheet TX1812IXA5-F01 because both share IC code 1812 and package letter I; that is an inference from the part number, not something any sheet states. Drive current, timing window and the meaning of the remaining letters are not confirmed for this SKU. The U suffix matches the TX1812CXU-F01 sheet, which prints different timing and electricals from the A-suffix sheets; the timing shown for this row is the protocol default and is NOT confirmed for this SKU. Most-stocked 2017 TCWIN SKU (13,110). LCSC stock 13,110 on 2026-10-15.

Pinout

TX1812IXA5-F01TX1812IWCA5-F01TX1812IWCU-F01
TX1812I 2017 package, top and side viewPin 1 is ringed. pin 1 DO (data out), pin 2 GND (ground), pin 3 DIN (data in), pin 4 VDD (power).11 DOdata out22 GNDground33 DINdata in44 VDDpower2.0 mm1.7 mmtop view0.9 mmside view
  • Data
  • Ground
  • Power
  • Pin 1
  • Polarity bar

Outline and pin positions checked against the manufacturer datasheet (C7495089 TX1812IXA5-F01 rev A2 p4). Half-moon notched pads at the two 2.0 mm ends (drawn square). The sheet shows a green bar / triangle mark and does not say what it denotes; pins are numbered in the top view. Pad size 0.52 x 0.70 mm, 0.97 mm between inner edges, 0.20 mm gap. What this means.

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

Protocol — TX1812

Timings shown from datasheet.

TX1812 bit timingTX1812 bit timing: a zero bit is 295 nanoseconds high then 595 low; a one bit is 595 high then 295 low; tolerance plus or minus 50 nanoseconds; reset 80 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 890 nsbit 1 period 890 nsT0H 295 ±50 nsT1H 595 ±50 nsT0L 595 ±50 nsT1L 295 ±50 ns"0" bit"1" bit02004006008001000120014001600time, 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 × ~890 ns ≈ 21.4 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 295 / T0L 595 · T1H 595 / T1L 295 ns · ±50 ns · period 890 ns · reset 80 µs source: datasheet

Compatibility

  • protocol compatible of this TCWIN T62

    The T62 electrical and timing tables are word for word the TX1812 5 mA tables (windows, 3.5-5.5 V, 4 kV ESD, 5 mA, GRB). The T62 sheet never mentions TX1812; this edge is based on the identical numbers only.

  • protocol compatible of this TCWIN T63 group

    The TX1812 sheets print T0H 245-345 and T0L 545-645 ns; the typical 295 / 595 ns pair lies inside the T63 windows (220-400 / 550-950 ns) and the T63 typicals (300 / 600 ns) lie inside the TX1812 windows, so one stream satisfies both printed sets. Supply, GRB framing and the other electrical tables are the same. Numbers only; no sheet relates the two, and nothing was measured.

  • protocol compatible of this TCWIN T80

    T80 is the same 6028 footprint as TX1812DQ-F01 and its T0H / T1L windows equal the TX1812 ones; its T0L / T1H windows (545-1200 ns) contain the TX1812 typical 595 ns. Numbers only; nothing measured and no sheet relates the two.

  • protocol compatible of this TX1812CXA5

    Same pin order, supply, 24-bit GRB framing and electrical table; only the printed timing windows differ (T0L/T1H 550-1200 ns here against 545-645 ns). The nominal values of the other TX1812 sheets (295 / 595 ns) lie inside these windows on T0H, T0L, T1H and T1L, so a stream built for those sheets is inside both sets of printed windows; the reverse is not true (900 ns is outside 545-645). Numbers only, never measured.

  • protocol compatible of this TX1813

    Identical printed windows, supply range, drive-current options and 24-bit GRB framing; TX1813 adds the FDIN backup data input. Numbers only; the sheets never relate the two ICs. What FDIN does is not explained in any TX1813 sheet.

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.

  • 2023-03-22 datasheet revision TCWIN TX1812PXA5-F01 specification cover: date 20230322, version A1 (earliest TX1812 sheet held) ↗ day
  • 2023-03-27 datasheet revision TCWIN TX1812IXA5-F01 specification cover: date 20230327, version A2 ↗ 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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