by adom
2020 Addressable RGB LED · 800 Kbps single-line cascade · 16 mA per channel (V1.0 sheet), 12 mA from V1.2
← Commit history
Underside photo, photo-matched 3D model notes, pin 1 orientation check, verification log
4 files changed
+175−6
README.md+33−4@@ -3,9 +3,14 @@ **Worldsemi WS2812B-2020**: 2020 addressable RGB LED, 800 kbps single-line cascade, 16 mA per channel in the first datasheet (V1.0, 2018) that this page's specs come from; Worldsemi's later revisions (V1.2 on, Dec 2018) rate it 12 mA. Listed as an Adom Basic Part; no reel is on hand yet, see Ordering. Worldsemi also sells it as WS2812B-2020-V6, -V7, WS2812C-2020-V6 and WS2812E-2020, all on this same footprint (see Ordering variants). <!-- product-photo -->-+| Top | Underside |+|---|---|+|  |  | -*Worldsemi WS2812B in the 2020 package, cropped from Worldsemi's [WS2812B family photo](https://www.world-semi.com/products-rgbic-led.html).*+*Top: cropped from Worldsemi's [WS2812B family photo](https://www.world-semi.com/products-rgbic-led.html).+Underside: cropped from [LCSC's product photo](https://www.lcsc.com/product-detail/C965555.html) of WS2812B-2020+(C965555), showing the four pads, the castellations and the mint-green polarity stripe with the Worldsemi+logo. Worldsemi publishes no underside photo.* <!-- /product-photo --> ::adom-verified{src="/adom/ws2812b-2020/render/verification.json"}@@ -58,10 +63,34 @@ printed: body 2.20 x 2.00 mm, height 0.84 mm with a 0.28 mm substrate, clear mou full 2.00 mm, terminals at 1.00 mm pitch, 1.13 mm between the bottom pads. Undimensioned features were measured off the Mechanical Dimensions drawings at 350 px/mm against the printed edges: bottom pads 0.535 x 0.78 mm, castellation radius 0.20 mm, the four top-side terminal shapes (traced from the Top View),-the underside polarity stripe beside pins 1/2, and the IC and R/G/B die positions (illustrative, the sketch-is undimensioned). Overlaid on the datasheet drawings at the same scale, the model matches the Back View and+and the underside polarity stripe beside pins 1/2. Overlaid on the datasheet drawings at the same scale, the model matches the Back View and Top View. +The drawings leave out some of what the real part shows, so those features come from the photos above:++| Feature | Seen in | Modelled as |+|---|---|---|+| Four metal lead-frame stubs on the long faces | Worldsemi photo | 0.41 mm long, 0.11 to 0.52 mm in from each end, 0.06 mm proud. Height cannot be read from a top photo: placed at the top of the base, 0.10 mm thick (estimated) |+| White top outside the moulding | both photos | white surface over the top-side terminal metal, which stays modelled beneath it |+| IC die size and position | Worldsemi photo | 0.53 x 0.29 mm (the datasheet sketch shows 0.67 x 0.52) |+| Mint-green polarity stripe | LCSC underside photo | sRGB (123, 242, 203), beside pins 1/2 as every drawing shows |+| Worldsemi logo on the stripe | LCSC underside photo, perspective-corrected | ring-and-WS mark 0.875 mm across on a white disc, outline traced from Worldsemi's own logo file |+| LED dies | Worldsemi photo, by their bond wires | three in a row 0.37 mm below the IC: a round single-wire die in the centre (red) with a rectangular two-wire die each side, green and blue in the datasheet's G R B order |++The underside photo shows no pin cue besides the stripe, so the logo's small offset along the stripe and the+way it reads up are taken from the photo's framing, not from a pin.++### Pin 1 orientation, checked end to end++A rotated LED is a scrapped board, so the orientation chain is checked against every drawing:++| Check | Result |+|---|---|+| Footprint pad 1 | (-0.915, -0.55) mm, the upper-left pad in KiCad's top view; the silkscreen L marks that corner |+| Model pin 1 (DO) | the same corner; pins 1 to 4 run counter-clockwise seen from the top, as in the datasheet Top View (the footprint is that view turned 180 deg) |+| Polarity stripe | on the underside beside pads 1/2, 0.05 mm from them, as the Back View and the PCB Solder Pad drawing show; the LCSC photo puts it on the same side |+| Top-side cue | the IC sits toward the pin 2/3 edge in the datasheet Top View, Worldsemi's photo and the model |+ The part number is marked in dark grey on the clear moulding's front wall (pins 2/3 side), so the window over the dies stays clear; a light mark would not read on the white housing. The real part carries no printed marking. `WS2812B-2020-uncoloured.step` is the same package without the die patches and without
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verification.json+142−2@@ -97,7 +97,7 @@ "name": "John Lauer", "handle": "john" },- "status": "verified",+ "status": "superseded", "title": "3D model built from Worldsemi's drawing and proven by overlay at scale", "scope": [ "3d-model"@@ -144,7 +144,7 @@ "name": "John Lauer", "handle": "john" },- "status": "verified",+ "status": "superseded", "title": "Hero: copper fill, outlines outside the copper, underside datasheet note", "scope": [ "hero"@@ -232,6 +232,146 @@ } ], "files": {}+ },+ {+ "date": "2026-10-04",+ "by": {+ "name": "John Lauer",+ "handle": "john"+ },+ "status": "verified",+ "title": "3D model matches the datasheet drawings and the real part in product photos",+ "scope": [+ "3d model"+ ],+ "variants": [+ "*"+ ],+ "checks": [+ {+ "text": "Package, terminals, castellations and stripe position as the datasheet draws them (overlay proof unchanged)",+ "result": "pass"+ },+ {+ "text": "Four lead-frame stubs on the long faces, measured from Worldsemi's photo: 0.41 mm long, 0.11 to 0.52 mm in from each end, 0.06 mm proud",+ "result": "pass"+ },+ {+ "text": "Stub height cannot be read from a top-view photo; estimated at the top of the base, 0.10 mm thick",+ "result": "note"+ },+ {+ "text": "White top outside the moulding and IC die 0.53 x 0.29 mm, as both photos show",+ "result": "pass"+ },+ {+ "text": "LED dies located by their bond wires: round red die centre, green and blue either side in the datasheet's G R B order",+ "result": "pass"+ },+ {+ "text": "Underside stripe mint green with the Worldsemi ring-and-WS logo, from LCSC's underside photo, logo outline traced from Worldsemi's logo file",+ "result": "pass"+ },+ {+ "text": "The underside photo has no pin cue besides the stripe, so the logo's reading direction comes from the photo's framing",+ "result": "note"+ }+ ],+ "evidence": [+ {+ "label": "model vs photos",+ "href": "docs/img/ws2812-model-vs-photos.jpg"+ },+ {+ "label": "Worldsemi photo",+ "href": "https://www.world-semi.com/products-rgbic-led.html"+ },+ {+ "label": "LCSC underside photo",+ "href": "https://www.lcsc.com/product-detail/C965555.html"+ }+ ],+ "files": {+ "WS2812B-2020.step": "4f1ad6e16c3548f1570c8f4fb8bbd5ae2f2e083770ee611eeac642c2cdc7d5d7",+ "WS2812B-2020-uncoloured.step": "55e5f8fa1614250bcc0d28a005a37112fec7dffa2beaa4f146b0ea36cbb8cc39"+ }+ },+ {+ "date": "2026-10-04",+ "by": {+ "name": "John Lauer",+ "handle": "john"+ },+ "status": "verified",+ "title": "Pin 1 orientation agrees across footprint, 3D model, datasheet and photos",+ "scope": [+ "footprint",+ "3d model"+ ],+ "variants": [+ "*"+ ],+ "checks": [+ {+ "text": "Footprint pad 1 at (-0.915, -0.55) mm with the silkscreen L on that corner",+ "result": "pass"+ },+ {+ "text": "Model pin 1 (DO) on the same corner; pins 1 to 4 counter-clockwise from the top, as the datasheet Top View (footprint = that view turned 180 deg)",+ "result": "pass"+ },+ {+ "text": "Underside polarity stripe beside pads 1/2, 0.05 mm from them, as the Back View and PCB Solder Pad drawing show",+ "result": "pass"+ },+ {+ "text": "LCSC underside photo puts the stripe on the same side (0.55 mm from the castellated edge vs 0.585 mm drawn)",+ "result": "pass"+ },+ {+ "text": "IC toward the pin 2/3 edge in the datasheet Top View, Worldsemi's photo and the model",+ "result": "pass"+ }+ ],+ "evidence": [+ {+ "label": "V6 datasheet p.2",+ "href": "https://www.world-semi.com/downloads/datasheets/en/ws2812b-2020-v6-1.0.pdf"+ }+ ],+ "files": {+ "WS2812B-2020.kicad_mod": "02e5bcf6a9713bc4d2ad20734f5f86e5c1c4c45b259697ece929eefce8c57a92",+ "WS2812B-2020.step": "4f1ad6e16c3548f1570c8f4fb8bbd5ae2f2e083770ee611eeac642c2cdc7d5d7"+ }+ },+ {+ "date": "2026-10-04",+ "by": {+ "name": "John Lauer",+ "handle": "john"+ },+ "status": "verified",+ "title": "Hero rebuilt on the photo-matched model: copper fill, outlines outside the copper, underside datasheet note",+ "scope": [+ "hero"+ ],+ "variants": [+ "*"+ ],+ "checks": [+ {+ "text": "Copper pads layer and the datasheet-note callout present after the rebuild",+ "result": "pass"+ },+ {+ "text": "Part number on the clear moulding's front wall, 0.17 mm caps, upright, pin 1 at the start",+ "result": "pass"+ }+ ],+ "evidence": [],+ "files": {+ "ws2812b-2020-hero.glb": "b68e3142df73f3c04ea7dd886cf7f88cd6f1b9484e4d70d13793bedfbbec66d3"+ } } ] }