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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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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 (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