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size not recorded 4 pins side-emitting

WS2815B-4020

4020 · smd · WS2815 · WorldSemi

1-wire RGB 12 V backup data line active

Also sold as WS2815B 4020

At a glance

Colour
RGB8 bits per channel
Data
1-wiretimed pulses on one line
Supply ≠
12 Vbackup data line
Size
—4 pins · side
Max current
36 mA12 mA per channel
PWM ≠
2 kHzreset 300 µs
Library support
FastLED WLED Adafruit

Datasheets disagree

The sources we hold state different values for the facts below. Rather than pick one quietly, both sides are listed with where each was read. Check the datasheet for the exact part number and revision you are buying. How this is shown.

Protocol WS2815

Reset period

The original sheet asks for 300 µs; the WS2815B-V1 sheet for more than 280 µs.

What each source says about reset period
SourceSaysPage
ws2815 RES 300 µs or more 5
ws2815b-v1-c5446699 RES > 280 µs 3
FastLED led_timing.h (driver-tuned) no reset recorded —

What we show. Both datasheet sets are listed; 300 µs satisfies both.

Bit timing

The bit windows differ widely between the original and V1 sheets, and FastLED’s values sit outside the original sheet.

What each source says about bit timing
SourceSaysPage
ws2815 T1H 750 ns–2 µs, T0L 750 ns–2 µs 4
ws2815b-v1-c5446699 T1H 580–840 ns, T0L 900–5000 ns 3
FastLED led_timing.h (driver-tuned) T1H 1340 ns, T0L 1640 ns, period 1890 ns —

What we show. The datasheet sets are listed in the timing table. For the very wide windows the stored midpoint is not a usable timing; read the windows.

PWM frequency

WorldSemi sheets give 2 kHz and 4 kHz, and one sheet gives both.

What each source says about pwm frequency
SourceSaysPage
ws2815 refresh frequency 2 kHz 2
ws2815b-v1-c5446699 "scan frequency is of 2KHz" and "Refresh Frequency updates to 4KHz" 1
ws2815b-4020-c42417605 port scan frequency 4 kHz 1

What we show. 2 kHz is shown (the original sheet). Later B sheets say 4 kHz.

Supply voltage

The sheets give a window around 12 V that moves between generations.

What each source says about supply voltage
SourceSaysPage
ws2815 VDD +9 to +13 V 4
ws2815b-v1-c5446699 VDD +9.5 to +13.5 V 2

What we show. The nominal 12 V rail is shown, not either window, so the part is found by the “12 V” filter. Stay inside the window on the sheet for your revision.

12 V in the side-view 4020 package: pins 1 DIN, 2 VDD, 3 DOUT, 4 GND in a row along the mounting edge. Dimensions: LCSC lists 4 x 2 mm; the sheet is picture-only.

Variants

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

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
WS2815B-4020 — — — 4 — active unknown PDF
Stock 1,365 when checked.

Pinout

WS2815B-4020
WS2815B-4020 4020 package, top and side viewPin 1 is ringed. pin 1 DIN (data in), pin 2 VDD (power), pin 3 DOUT (data out), pin 4 GND (ground).11 DIN22 VDD33 DOUT44 GND4.0 mm2.0 mmfront view (lens face)
  • Data
  • Power
  • Ground
  • Pin 1

Outline drawn from the package family and the recorded dimensions; not yet checked against a datasheet. Pad sizes are approximate. The sheet gives a pin strip but no dimensions; drawn like the WS2812B-4020. What this means.

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

Protocol — WS2815

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

WS2815 bit timingWS2815 bit timing: a zero bit is 350 nanoseconds high then 1375 low; a one bit is 1375 high then 350 low; tolerance plus or minus 300 nanoseconds; reset 300 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 1725 nsbit 1 period 1725 nsT0H 350 ±300 nsT1H 1375 ±300 nsT0L 1375 ±300 nsT1L 350 ±300 ns"0" bit"1" bit050010001500200025003000time, ns± tolerance on each falling edge2 · One frame: 24 bits, most-significant bit firstDIN170110010007100110101700101100bitG · 8 bitsR · 8 bitsB · 8 bitsWire order GRB · frame = 24 × ~1725 ns ≈ 41.4 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 ≥ 300 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.BIN (backup): tied to the previous pixel's DIN
T0H 350 / T0L 1375 · T1H 1375 / T1L 350 ns · ±300 ns · period 1725 ns · reset 300 µs source: datasheet

Compatibility

  • near clone WS2813

    Same backup-data-line concept, but 12 V and a different bit period. Do not assume WS2813 timings will drive it.

  • electrically similar of this GS8208

    Both are 12 V single-wire parts with a backup data line, and both are driven with WS2812-family timings, but they are different silicon with different specifications.

  • near clone of this WS2818

    Both are 12 V parts with a backup line; the bit periods differ (1200 ns vs 1890 ns), so they are not interchangeable without changing timings.

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.

  • 2020-01-13 first library support WLED — first commit introducing WS2815 ↗ day
  • 2024-09-12 first library support FastLED — first commit introducing WS2815 ↗ 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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