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5.0 × 5.0 mm 4 pins top-emitting

IN-PI554FCH

5050 · smd · Inolux PI (single-trace IC) · Inolux Corporation

1-wire RGB 3.5–5.5 V active

Also sold as IN-PI554FCH

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
5.0 × 5.0 × 1.6 mm4 pins · top
Max current
36 mA12 mA per channel
PWM
1.2 kHzreset 80 µs
Library support
FastLED WLED Adafruit

Four-pad sibling of the IN-PI556FCH, same IC tables (VDS max 26 V, IDOH 49 mA, IDOL -50 mA, abs max VDD 3.5-5.5 V, typ 0.3 / 0.9 / 0.6 / 0.6 us +/-0.15, reset 80 us, GRB MSB first - the same tables as the PI556FCH). LCSC stock 0 on 2026-10-15.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
IN-PI554FCH — — — 4 — active 2015-12-21 2.2
LCSC C22219545, stock 0.

Pinout

IN-PI554FCH
IN-PI554FCH 5050 package, top and side viewPin 1 is ringed. pin 1 VSS (ground), pin 2 DIN (data in), pin 3 VDD (power), pin 4 DO (data out).11 VSSground22 DINdata in33 VDDpower44 DOdata out5.4 mm overall5.0 mmtop view1.6 mmside view
  • Ground
  • Data
  • Power
  • Pin 1
  • Cut corner

Outline and pin positions checked against the manufacturer datasheet (C22219545 IN-PI554FCH v2.2 p9). Pins number counter-clockwise from the bottom-right pad (1 VSS), pin 3 VDD is top-left, pin 4 DO bottom-left. The pad sizes 1.0 x 1.0 mm, 5.4 mm across and 4.2 mm tall are the callouts on the outline figure. What this means.

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

Protocol — Inolux PI (single-trace IC)

Timings shown from datasheet. Other sources disagree; see the protocol page.

Inolux PI (single-trace IC) bit timingInolux PI (single-trace IC) bit timing: a zero bit is 300 nanoseconds high then 900 low; a one bit is 600 high then 600 low; tolerance plus or minus 150 nanoseconds; reset 80 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 1200 nsbit 1 period 1200 nsT0H 300 ±150 nsT1H 600 ±150 nsT0L 900 ±150 nsT1L 600 ±150 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 600 / T1L 600 ns · ±150 ns · period 1200 ns · reset 80 µs source: datasheet

Compatibility

  • protocol compatible SK6812

    The four typical values of the older sheets (T0H 300, T0L 900, T1H 600, T1L 600 ns, reset 80 us, GRB, 24 bit, MSB first) are the same numbers the sk6812 protocol records from the OPSCO SK6812 rev. 02 sheet, so the framing and timing are interchangeable on those sheets. None of the Inolux sheets mentions SK6812 or WS2812 by name. The newer windowed sheets move the typical T1H to 640-900 ns, and the PI55TA and PI3210 sheets ask for a reset of 200 us, so this is protocol-compatible, not a clone claim. source ↗

  • protocol compatible of this Inolux PI dual-signal (single-trace IC with BIN)

    Same single-trace code, timing windows and GRB frame as inolux-pi (PI33TC sheet, p5-6); the only difference the sheet documents is the second data input BIN that lets the chain 'continue transmission' past a dead pixel.

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.

  • 2015-12-21 datasheet revision Inolux IN-PI554FCH data sheet revision table: 'Initial release 1.0 12-21-2015' (also on the IN-PI556FCH sheet) ↗ 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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