GN1640 from GN Semic, in a SOP-28-300mil. 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	GRID12	output	Digit (grid) output 12. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V. Connects to the common cathode of digit 12 in a multiplexed LED matrix.
2	GRID13	output	Digit (grid) output 13. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
3	GRID14	output	Digit (grid) output 14. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
4	GRID15	output	Digit (grid) output 15. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
5	GRID16	output	Digit (grid) output 16. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
6	GND	power_in	Ground reference (0 V) for logic and driver outputs.
7	DATA	input	Serial data input for the 2-wire (CLK/DATA) interface. Data is sampled on CLK; setup/hold ≥ 100 ns. VIH ≥ 0.7·VDD, VIL ≤ 0.2·VDD.
8	CLK	input	Serial clock input for the 2-wire (CLK/DATA) interface. Max 1 MHz (50% duty); pulse width ≥ 400 ns.
9	SEG1	output	Segment output 1. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
10	SEG2	output	Segment output 2. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
11	SEG3	output	Segment output 3. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
12	SEG4	output	Segment output 4. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
13	SEG5	output	Segment output 5. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
14	SEG6	output	Segment output 6. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
15	SEG7	output	Segment output 7. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
16	SEG8	output	Segment output 8. P-channel open-drain, sources up to 50-60 mA (typ) at VOH=VDD-2 V.
17	VDD	power_in	Positive supply. Operating range 3.0-5.5 V (typ 5.0 V). Absolute max +7 V. Quiescent IDD ≈ 130 µA (typ).
18	GRID1	output	Digit (grid) output 1. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
19	GRID2	output	Digit (grid) output 2. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
20	GRID3	output	Digit (grid) output 3. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
21	GRID4	output	Digit (grid) output 4. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
22	GRID5	output	Digit (grid) output 5. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
23	GRID6	output	Digit (grid) output 6. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
24	GRID7	output	Digit (grid) output 7. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
25	GRID8	output	Digit (grid) output 8. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
26	GRID9	output	Digit (grid) output 9. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
27	GRID10	output	Digit (grid) output 10. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.
28	GRID11	output	Digit (grid) output 11. N-channel open-drain, sinks up to 120 mA (typ) at VOL=0.3 V.

Key specifications

Parameter	Value
Manufacturer	GN Semic
Package	SOP-28-300mil
Category	LED-drv
Pins	28

Ordering variants

Same part, different packaging or reel option.

GN1640
GN1640T

CAD (KiCad official)

Symbol: GN1640
Footprint: Package_SO:SOP-28_8.4x18.16mm_P1.27mm
3D model: SOP-28-300mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`gn1640.step`	362 KB	You want the bare part, or you mark your own boards.
`gn1640-etched.step`	2.5 MB	You want the part with `GN1640` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 627 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 (13 pp, sha256 786deb214b31278e, 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