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HT16C21A-24SSOP
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Holtek Semicon LCD Drivers, SSOP-24-150mil. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+61@@ -0,0 +1,61 @@+# HT16C21A-24SSOP++**Holtek Semicon** · LCD Drivers · SSOP-24-150mil++HT16C21A-24SSOP from Holtek Semicon, in a SSOP-24-150mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | SEG19/VLCD | output | LCD segment 19 output or LCD bias voltage (VLCD) reference pin (configurable as SEG or VLCD via internal register; 0V to VDD). |+| 2 | SEG18 | output | LCD segment 18 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 3 | SEG15 | output | LCD segment 15 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 4 | SEG14 | output | LCD segment 14 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 5 | SEG13 | output | LCD segment 13 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 6 | SEG12 | output | LCD segment 12 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 7 | SEG11 | output | LCD segment 11 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 8 | SEG10 | output | LCD segment 10 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 9 | SEG7 | output | LCD segment 7 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 10 | SEG6 | output | LCD segment 6 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 11 | SEG5 | output | LCD segment 5 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 12 | SEG4 | output | LCD segment 4 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 13 | COM7/SEG3 | output | LCD COM 7 output or segment 3 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage. |+| 14 | COM6/SEG2 | output | LCD COM 6 output or segment 2 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage. |+| 15 | COM5/SEG1 | output | LCD COM 5 output or segment 1 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage. |+| 16 | COM4/SEG0 | output | LCD COM 4 output or segment 0 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage. |+| 17 | COM3 | output | LCD COM 3 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 18 | COM2 | output | LCD COM 2 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 19 | COM1 | output | LCD COM 1 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 20 | COM0 | output | LCD COM 0 output; sink/source capability 250-800 μA depending on VLCD voltage. |+| 21 | VSS | power_in | Negative power supply voltage, ground reference (0V). |+| 22 | SCL | input | I2C serial clock input with Schmitt trigger; VIH ≥ 0.7VDD, VIL ≤ 0.3VDD, input filter time constant 50-100 ns. |+| 23 | SDA | bidirectional | I2C serial data input/output, open-drain configuration; VIH ≥ 0.7VDD, VIL ≤ 0.3VDD, external pull-up required. |+| 24 | VDD | power_in | Positive power supply voltage (2.4V to 5.5V). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Holtek Semicon |+| Package | SSOP-24-150mil |+| Category | LED Drivers |+| Pins | 24 |++## CAD (KiCad official)++- Symbol: `HT16C21A-24SSOP`+- Footprint: `Package_SO:SSOP-24_5.3x8.2mm_P0.65mm`+- 3D model: SSOP-24-150mil (KiCad packages3D, STEP)+- 3D model files: `ht16c21a-24ssop-etched.step` / `ht16c21a-24ssop-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht16c21a-24ssop.step` / `ht16c21a-24ssop.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Holtek Semicon datasheet](https://www.holtek.com.cn/webapi/116706/simHT16C21Av130.pdf) (35 pp, sha256 `9e2057530a66f187`, retrieved 2026-09-29, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ht16c21a-24ssop-datasheet.pdf)
page.jsonadded+236@@ -0,0 +1,236 @@+{+ "slug": "ht16c21a-24ssop",+ "version": "0.1.0",+ "type": "component",+ "description": "Holtek Semicon LCD Drivers, SSOP-24-150mil. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "led drivers",+ "ht16c21a-24ssop",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "ht16c21a-24ssop.kicad_sym",+ "ht16c21a-24ssop.kicad_mod",+ "ht16c21a-24ssop.glb",+ "ht16c21a-24ssop.step",+ "ht16c21a-24ssop.lbr",+ "docs/hero.png",+ "docs/ht16c21a-24ssop-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ],+ "component": {+ "mpn": "HT16C21A-24SSOP",+ "manufacturer": "Holtek Semicon",+ "package": "SSOP-24-150mil",+ "pin_count": 24,+ "category": "LED Drivers",+ "subcategory": "LCD Drivers",+ "datasheet": "https://www.holtek.com.cn/webapi/116706/simHT16C21Av130.pdf",+ "parts": {+ "symbol": "ht16c21a-24ssop.kicad_sym",+ "footprint": "ht16c21a-24ssop.kicad_mod",+ "model_3d": "ht16c21a-24ssop-etched.glb",+ "model_3d_plain": "ht16c21a-24ssop.glb",+ "model_3d_step": "ht16c21a-24ssop-etched.step",+ "model_3d_step_plain": "ht16c21a-24ssop.step",+ "lbr": "ht16c21a-24ssop.lbr"+ },+ "distributor_links": {+ "lcsc": "C5444714"+ },+ "distributor_check": {+ "checked_at": "2026-09-29T17:06:03Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": null,+ "status": "no match"+ },+ "mouser": {+ "pn": null,+ "status": "no match"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "SEG19/VLCD",+ "type": "output",+ "description": "LCD segment 19 output or LCD bias voltage (VLCD) reference pin (configurable as SEG or VLCD via internal register; 0V to VDD)."+ },+ {+ "number": "2",+ "name": "SEG18",+ "type": "output",+ "description": "LCD segment 18 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "3",+ "name": "SEG15",+ "type": "output",+ "description": "LCD segment 15 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "4",+ "name": "SEG14",+ "type": "output",+ "description": "LCD segment 14 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "5",+ "name": "SEG13",+ "type": "output",+ "description": "LCD segment 13 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "6",+ "name": "SEG12",+ "type": "output",+ "description": "LCD segment 12 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "7",+ "name": "SEG11",+ "type": "output",+ "description": "LCD segment 11 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "8",+ "name": "SEG10",+ "type": "output",+ "description": "LCD segment 10 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "9",+ "name": "SEG7",+ "type": "output",+ "description": "LCD segment 7 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "10",+ "name": "SEG6",+ "type": "output",+ "description": "LCD segment 6 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "11",+ "name": "SEG5",+ "type": "output",+ "description": "LCD segment 5 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "12",+ "name": "SEG4",+ "type": "output",+ "description": "LCD segment 4 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "13",+ "name": "COM7/SEG3",+ "type": "output",+ "description": "LCD COM 7 output or segment 3 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "14",+ "name": "COM6/SEG2",+ "type": "output",+ "description": "LCD COM 6 output or segment 2 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "15",+ "name": "COM5/SEG1",+ "type": "output",+ "description": "LCD COM 5 output or segment 1 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "16",+ "name": "COM4/SEG0",+ "type": "output",+ "description": "LCD COM 4 output or segment 0 output in multiplexed mode; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "17",+ "name": "COM3",+ "type": "output",+ "description": "LCD COM 3 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "18",+ "name": "COM2",+ "type": "output",+ "description": "LCD COM 2 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "19",+ "name": "COM1",+ "type": "output",+ "description": "LCD COM 1 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "20",+ "name": "COM0",+ "type": "output",+ "description": "LCD COM 0 output; sink/source capability 250-800 μA depending on VLCD voltage."+ },+ {+ "number": "21",+ "name": "VSS",+ "type": "power_in",+ "description": "Negative power supply voltage, ground reference (0V)."+ },+ {+ "number": "22",+ "name": "SCL",+ "type": "input",+ "description": "I2C serial clock input with Schmitt trigger; VIH ≥ 0.7VDD, VIL ≤ 0.3VDD, input filter time constant 50-100 ns."+ },+ {+ "number": "23",+ "name": "SDA",+ "type": "bidirectional",+ "description": "I2C serial data input/output, open-drain configuration; VIH ≥ 0.7VDD, VIL ≤ 0.3VDD, external pull-up required."+ },+ {+ "number": "24",+ "name": "VDD",+ "type": "power_in",+ "description": "Positive power supply voltage (2.4V to 5.5V)."+ }+ ],+ "provenance": {+ "extractor": "ds2sf",+ "datasheet": {+ "url": "https://www.holtek.com.cn/webapi/116706/simHT16C21Av130.pdf",+ "pages": 35,+ "sha256": "9e2057530a66f187",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 24,+ "described": 24,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}