GN1640T 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	GRID12	output	Grid (digit) output 12. N-channel open-drain output that sinks common-cathode LED digit current. Max sink current 200 mA (IO2 abs max); typical IOL1 = 120 mA at VOL = 0.3 V.
2	GRID13	output	Grid (digit) output 13. N-channel open-drain digit driver for common-cathode LED matrix.
3	GRID14	output	Grid (digit) output 14. N-channel open-drain digit driver.
4	GRID15	output	Grid (digit) output 15. N-channel open-drain digit driver.
5	GRID16	output	Grid (digit) output 16. N-channel open-drain digit driver.
6	GND	power_in	Ground reference (0 V).
7	DATA	input	Serial data input for the 2-wire (CLK/DATA) interface. VIH >= 0.7VDD, VIL <= 0.2VDD. Data changes only while CLK is low; a high-to-low DATA transition while CLK is high signals START, a low-to-high transition while CLK is high signals STOP.
8	CLK	input	Serial clock input for the 2-wire interface. Max clock frequency Fmax = 1 MHz at 50% duty cycle; clock pulse width PWCLK = 400 ns typical; tSETUP = tHOLD = 100 ns.
9	SEG1	output	Segment output 1. P-channel open-drain source driver for LED segments. IOH1 = 50 mA typ at VOH = VDD-2 V; abs max IO1 = 50 mA.
10	SEG2	output	Segment output 2. P-channel open-drain segment driver.
11	SEG3	output	Segment output 3. P-channel open-drain segment driver.
12	SEG4	output	Segment output 4. P-channel open-drain segment driver.
13	SEG5	output	Segment output 5. P-channel open-drain segment driver.
14	SEG6	output	Segment output 6. P-channel open-drain segment driver.
15	SEG7	output	Segment output 7. P-channel open-drain segment driver.
16	SEG8	output	Segment output 8. P-channel open-drain segment driver.
17	VDD	power_in	Supply voltage. Operating range 3.0 V - 5.5 V, typical 5.0 V. Abs max +7.0 V. Typical quiescent current IDD = 130 uA (no load, VIN = VDD).
18	GRID1	output	Grid (digit) output 1. N-channel open-drain digit driver.
19	GRID2	output	Grid (digit) output 2. N-channel open-drain digit driver.
20	GRID3	output	Grid (digit) output 3. N-channel open-drain digit driver.
21	GRID4	output	Grid (digit) output 4. N-channel open-drain digit driver.
22	GRID5	output	Grid (digit) output 5. N-channel open-drain digit driver.
23	GRID6	output	Grid (digit) output 6. N-channel open-drain digit driver.
24	GRID7	output	Grid (digit) output 7. N-channel open-drain digit driver.
25	GRID8	output	Grid (digit) output 8. N-channel open-drain digit driver.
26	GRID9	output	Grid (digit) output 9. N-channel open-drain digit driver.
27	GRID10	output	Grid (digit) output 10. N-channel open-drain digit driver.
28	GRID11	output	Grid (digit) output 11. N-channel open-drain digit driver.

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.

GN1640TT
GN1640T

CAD (KiCad official)

Symbol: GN1640T
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
`gn1640t.step`	362 KB	You want the bare part, or you mark your own boards.
`gn1640t-etched.step`	2.5 MB	You want the part with `GN1640T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 646 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 ef899cd4b78754dd, 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