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4.0 × 1.7 mm 4 pins emission unknown-emitting

T71

4018 · smd · TCWIN T63 group · 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
4.0 × 1.7 × 2.0 mm4 pins · emission unknown
Max current
36 mA12 mA per channel
PWM
4 kHzreset 80 µs
Library support
FastLED WLED Adafruit

TCWIN T71: a 4.0 x 1.7 x 2.0 mm four-pad row package (the sheet calls it a 4018 LED; LCSC lists the package only as “SMD”), 12 mA per channel (9.6-14.4), cover rating 0.18 W, version A5 dated 2024-07-18. Pins 1 DIN, 2 VDD, 3 DO, 4 GND in a single row (pads 0.5 mm wide with 0.35 mm gaps), numbered left to right in the sheet front view, which shows the four pads along the bottom edge. The sheet does not use the words “side view”; it is drawn here with the same four-in-a-row footprint as the 4020 side-view parts.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
T71 — — — 4 — active 2024-07-18 A5
LCSC stock 1,990 on 2026-10-15.

Pinout

T71
T71 4018 package, top and side viewPin 1 is ringed. pin 1 DIN (data in), pin 2 VDD (power), pin 3 DO (data out), pin 4 GND (ground).11 DIN22 VDD33 DO44 GND4.0 mm1.7 mmfront view (lens face)2.0 mm deepside view
  • Data
  • Power
  • Ground
  • Pin 1

Outline and pin positions checked against the manufacturer datasheet (C48982524 T71 rev A5 p4). Four pads in a row, numbered left to right in the sheet front view (1 DIN, 2 VDD, 3 DO, 4 GND). The sheet does not use the words side view; pad height approximate (land pattern 1.2 mm tall). What this means.

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

Protocol — TCWIN T63 group

Timings shown from datasheet.

TCWIN T63 group bit timingTCWIN T63 group bit timing: a zero bit is 300 nanoseconds high then 600 low; a one bit is 600 high then 300 low; reset 80 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 900 nsbit 1 period 900 nsT0H 300 nsT1H 600 nsT0L 600 nsT1L 300 ns"0" bit"1" bit020040060080010001200140016001800time, 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 × ~900 ns ≈ 21.6 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 600 · T1H 600 / T1L 300 ns · period 900 ns · reset 80 µs source: datasheet

Compatibility

  • protocol compatible TX1812

    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. 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 T71 specification cover: date 20240718, version A5 ↗ day
  • 2024-07-18 datasheet revision TCWIN T63 / T66 / T67 / T68 / T71 / T73 / T76 specification covers: 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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