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HTM1668-SSOP24

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by Ray

TDSEMIC Digital Tube Drivers, SSOP-24. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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HTM1668-SSOP24

TDSEMIC · Digital Tube Drivers · SSOP-24

HTM1668-SSOP24 from TDSEMIC, in a SSOP-24. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 DIO bidirectional Serial data input/output. Data is shifted in on the CLK rising edge, LSB first; data is shifted out on the CLK falling edge, LSB first. Output is N-channel open-drain with an internal ~20 kΩ pull-up.
2 CLK input Serial clock input. Data is latched on the rising edge and driven out on the falling edge.
3 STB input Chip-select / strobe. A rising or falling edge initializes the serial interface, after which the chip waits for a command. When STB is low the first byte after the low transition is interpreted as an instruction. Pulling STB high aborts an in-progress command and CLK is ignored.
4 K1 input Key-scan data input row 1. Data on this pin is latched at the end of the display cycle. Includes an internal ~10 kΩ pull-down.
5 K2 input Key-scan data input row 2. Data on this pin is latched at the end of the display cycle. Includes an internal ~10 kΩ pull-down.
6 VDD power_in Logic supply voltage. Operating range 3.0-5.5 V, typical 5 V. Absolute maximum -0.5 to +7.0 V.
7 SEG1/KS1 output LED segment output 1, also used as key-scan strobe KS1. P-channel open-drain output, IOH1 ~ -30 mA typical (VO = VDD-2 V).
8 SEG2/KS2 output LED segment output 2, also used as key-scan strobe KS2. P-channel open-drain output.
9 SEG3/KS3 output LED segment output 3, also used as key-scan strobe KS3. P-channel open-drain output.
10 SEG4/KS4 output LED segment output 4, also used as key-scan strobe KS4. P-channel open-drain output.
11 SEG5/KS5 output LED segment output 5, also used as key-scan strobe KS5. P-channel open-drain output.
12 SEG6/KS6 output LED segment output 6, also used as key-scan strobe KS6. P-channel open-drain output.
13 SEG7/KS7 output LED segment output 7, also used as key-scan strobe KS7. P-channel open-drain output.
14 SEG8/KS8 output LED segment output 8, also used as key-scan strobe KS8. P-channel open-drain output.
15 SEG9/KS9 output LED segment output 9, also used as key-scan strobe KS9. P-channel open-drain output.
16 SEG10/KS10 output LED segment output 10, also used as key-scan strobe KS10. P-channel open-drain output.
17 SEG12/GRID7 output Segment/grid multiplexed output. Acts as SEG12 in 7-digit x 10-seg mode or GRID7 in 4-digit x 13-seg mode depending on the configured display mode.
18 SEG13/GRID6 output Segment/grid multiplexed output. Acts as SEG13 or GRID6 depending on the configured display mode.
19 SEG14/GRID5 output Segment/grid multiplexed output. Acts as SEG14 or GRID5 depending on the configured display mode.
20 GRID4 output Digit (grid) output 4. N-channel open-drain output, IOL1 ~ 140 mA typical (VO = 0.3 V).
21 GRID3 output Digit (grid) output 3. N-channel open-drain output.
22 GND power_in Logic ground / system ground return (0 V reference).
23 GRID2 output Digit (grid) output 2. N-channel open-drain output.
24 GRID1 output Digit (grid) output 1. N-channel open-drain output.

Key specifications

Parameter Value
Manufacturer TDSEMIC
Package SSOP-24
Category LED Drivers
Pins 24

Ordering variants

Same part, different packaging or reel option.

  • HTM1668-SSOP24

CAD (KiCad official)

  • Symbol: HTM1668-SSOP24
  • Footprint: Package_SO:SSOP-24_5.3x8.2mm_P0.65mm
  • 3D model: SSOP-24 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: TDSEMIC datasheet (14 pp, sha256 fd0c8d65e7560af5, retrieved 2026-08-17, 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