GN1628T from GN Semic, in a SSOP-28-150mil. 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	NC	unconnected	No connect. Leave floating.
2	DIO	bidirectional	Serial data I/O for the 3-wire host interface. N-channel open-drain output with an internal ~24 kΩ pull-up to VDD. Data is shifted LSB first synchronous to CLK; direction switches between write (display RAM) and read (key-scan) cycles.
3	CLK	input	Serial clock input for the 3-wire host interface. Data on DIO is sampled on the rising edge. Max clock frequency 1 MHz at 50% duty; min pulse width 400 ns.
4	STB	input	Chip-select / strobe input. A falling edge starts a command/data frame; the rising edge latches it. Held high between transfers.
5	K1	input	Key-matrix return line 1. Input with internal ~10 kΩ pull-down; driven high through the pressed key by the currently scanning KSn line.
6	K2	input	Key-matrix return line 2. Input with internal ~10 kΩ pull-down; second row of the 10x2 key matrix.
7	VDD	power_in	Positive supply, 3.0-5.5 V (typ 5 V). Bypass to GND with a local decoupling capacitor. Tied internally to pin 21.
8	SEG1/KS1	output	Muxed LED segment output SEG1 / key-scan drive line KS1. P-channel open-drain output; sources up to -25 mA typ (-40 mA max) for LED anode drive and pulses to strobe key column 1 during key scan.
9	SEG2/KS2	output	Muxed LED segment output SEG2 / key-scan drive line KS2. P-channel open-drain, same drive rating as SEG1/KS1.
10	SEG3/KS3	output	Muxed LED segment output SEG3 / key-scan drive line KS3. P-channel open-drain.
11	SEG4/KS4	output	Muxed LED segment output SEG4 / key-scan drive line KS4. P-channel open-drain.
12	SEG5/KS5	output	Muxed LED segment output SEG5 / key-scan drive line KS5. P-channel open-drain.
13	SEG6/KS6	output	Muxed LED segment output SEG6 / key-scan drive line KS6. P-channel open-drain.
14	SEG7/KS7	output	Muxed LED segment output SEG7 / key-scan drive line KS7. P-channel open-drain.
15	SEG8/KS8	output	Muxed LED segment output SEG8 / key-scan drive line KS8. P-channel open-drain.
16	SEG9/KS9	output	Muxed LED segment output SEG9 / key-scan drive line KS9. P-channel open-drain.
17	SEG10/KS10	output	Muxed LED segment output SEG10 / key-scan drive line KS10. P-channel open-drain.
18	SEG12/GRID7	output	Muxed segment SEG12 / grid (digit) driver GRID7. Push-pull (P/N) open-drain output; role depends on the display-mode command (4/13, 5/12, 6/11 or 7/10 grid/segment).
19	SEG13/GRID6	output	Muxed segment SEG13 / grid driver GRID6. Push-pull (P/N) open-drain output.
20	SEG14/GRID5	output	Muxed segment SEG14 / grid driver GRID5. Push-pull (P/N) open-drain output.
21	VDD	power_in	Positive supply (tied to pin 7). 3.0-5.5 V. Both VDD pins should be connected to the same rail with local decoupling.
22	GND	power_in	Ground return. All three GND pins (22, 25, 28) must be tied to the board 0 V plane.
23	GRID4	output	Digit (grid) driver 4. N-channel open-drain sink, IOL 100 mA typ at VO = 0.3 V; strobes the common cathode of digit 4 during display refresh.
24	GRID3	output	Digit (grid) driver 3. N-channel open-drain sink.
25	GND	power_in	Ground return (see pin 22).
26	GRID2	output	Digit (grid) driver 2. N-channel open-drain sink.
27	GRID1	output	Digit (grid) driver 1. N-channel open-drain sink.
28	GND	power_in	Ground return (see pin 22).

Key specifications

Parameter	Value
Manufacturer	GN Semic
Package	SSOP-28-150mil
Category	LED-drv
Pins	28

Ordering variants

Same part, different packaging or reel option.

GN1628T

CAD (KiCad official)

Symbol: GN1628T
Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
3D model: SSOP-28-150mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`gn1628t.step`	362 KB	You want the bare part, or you mark your own boards.
`gn1628t-etched.step`	2.7 MB	You want the part with `GN1628T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 673 faces against 447 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: GN Semic datasheet (15 pp, sha256 d96ca73eb1d02e82, 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