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5.4 × 5.0 mm 4 pins top-emitting

TX1812C

5050 · 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
5.4 × 5.0 × 1.6 mm4 pins · top
Max current
—per-channel not recorded
PWM
4 kHzreset 80 µs
Library support
FastLED WLED Adafruit

TCWIN’s own 1812 driver IC in a 5050 package. Both sheets held (TX1812CXA5-F02 and TX1812CWCA-F70, version A2, cover date 2023-03-27) give pins 1 VDD, 2 DO, 3 GND, 4 DIN and a 5.0 x 5.4 x 1.6 mm outline (5.4 across the leads): the same pin order and outline as the WS2812B 5050 in this catalogue, with its own timing and drive current, so it is not a drop-in on the strength of the footprint alone.

Datasheets disagree: the CXA5-F02 sheet (p7) prints T0H 200/300/400, T0L 550/900/1200, T1H 550/900/1200, T1L 200/300/400 ns (the typical column is headed “preferred”), while the CWCA-F70 sheet (p7) prints T0H 245/295/345, T0L 545/595/645, T1H 545/595/645, T1L 245/295/345 ns. The rest of the two electrical tables is the same except for the drive current: 5 mA (CXA5, cover rating 0.08 W) against 12 mA, 9.6-14.4 (CWCA, cover rating 0.18 W). The CXA5-F02 variant is therefore filed under protocol tx1812-cxa5. The CWCA-F70 sheet also prints an input-high threshold of 0.5 VDD minimum where the other TX1812 sheets print 0.7 VDD.

Four SKUs (CWBA-F01, CWCA-F01, CWCA5-F02, CWCD-F01) have no datasheet on LCSC. They share IC code 1812 and package letter C with the two sheets, so they are listed here with the same pinout and drawing; that is an inference from the part number. CWBA-F01 is the most-stocked TCWIN part on LCSC (48,840). The SKUs with an FW suffix (CWBL-FW301 etc.) are filed under the RGBW part instead, see tx1812-rgbw-5050.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
TX1812CXA5-F02 — — — 4 — active 2023-03-27 A2A2 ↗
Cover rating 0.08 W. 5 mA per channel (IO typ 5, no min/max printed). Its timing windows differ from the other TX1812 sheets, hence its own protocol. LCSC stock 590 on 2026-10-15.
TX1812CWCA-F70 — — — 4 — active 2023-03-27 A2
Cover rating 0.18 W. 12 mA per channel (9.6 / 12 / 14.4). The sheet letterhead is the newer one (Tiancheng Hi-Tech (Shenzhen) Co., Ltd.) and gives the contact fengyi@tczmled.com. LCSC stock 340 on 2026-10-15.
TX1812CWBA-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 TX1812CXA5-F02 and TX1812CWCA-F70 because both share IC code 1812 and package letter C; 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 48,840 on 2026-10-15.
TX1812CWCA-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 TX1812CWCA-F70 because both share IC code 1812 and package letter C; 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 20 on 2026-10-15.
TX1812CWCA5-F02 — — — 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 TX1812CXA5-F02 and TX1812CWCA-F70 because both share IC code 1812 and package letter C; 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 310 on 2026-10-15.
TX1812CWCD-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 TX1812CWCA-F70 because both share IC code 1812 and package letter C; 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 860 on 2026-10-15.

Pinout

TX1812CXA5-F02TX1812CWCA-F70TX1812CWBA-F01TX1812CWCA-F01TX1812CWCA5-F02TX1812CWCD-F01
TX1812C 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 (C27636997 TX1812CWCA-F70 rev A2 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 — 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 TX1812CWCA-F70 specification cover: date 20230327, version A2 ↗ day
  • 2023-03-27 datasheet revision TCWIN TX1812CXA5-F02 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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