GN1651 from GN Semic, in a SOP-16. 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	GND	power_in	Logic ground. Connect to system ground (0 V reference).
2	SG1/KS1	output	Segment output 1 / key-scan line 1. N-channel open-drain output; drives an LED segment and is also used as a key-scan drive line. Typical low-level output current -25 mA at Vo=2 V.
3	SG2/KS2	output	Segment output 2 / key-scan line 2. N-channel open-drain output.
4	SG3/KS3	output	Segment output 3 / key-scan line 3. N-channel open-drain output.
5	SG4/KS4	output	Segment output 4 / key-scan line 4. N-channel open-drain output.
6	SG5/KS5	output	Segment output 5 / key-scan line 5. N-channel open-drain output.
7	SG6/KS6	output	Segment output 6 / key-scan line 6. N-channel open-drain output.
8	SG7/KS7	output	Segment output 7 / key-scan line 7. N-channel open-drain output.
9	DIG4	output	Digit (grid) output 4. P-channel open-drain output; drives the common-anode of digit 4 of the LED display. Typical high-level output current 140 mA at Vo=VDD-0.3 V.
10	DIG3	output	Digit (grid) output 3. P-channel open-drain output driving common-anode of digit 3.
11	DIG2	output	Digit (grid) output 2. P-channel open-drain output driving common-anode of digit 2.
12	DIG1	output	Digit (grid) output 1. P-channel open-drain output driving common-anode of digit 1.
13	VDD	power_in	Logic supply voltage. 5 V +/- 10% typical; recommended operating range 3.0 - 5.5 V (typical 5 V). Absolute max -0.5 to +7.0 V.
14	DIO	bidirectional	Serial data input/output. Input data changes while CLK is low and is transferred while CLK is high; the chip generates an ACK on the 9th clock of every byte by pulling DIO low. Output stage is N-channel open-drain with an internal 10 k pull-up.
15	CLK	input	Serial clock input. Data is sampled/shifted on the rising edge. VIH >= 0.7VDD, VIL <= 0.3VDD; max clock frequency 1 MHz at 50% duty cycle.
16	K1	input	Key-scan data input. The value on this pin is latched at the end of each display period; used together with the SG1..SG7 key-scan drives to read a 1x7 key matrix. Has an internal 10 k pull-up.

Key specifications

Parameter	Value
Manufacturer	GN Semic
Package	SOP-16
Category	LED-drv
Pins	16

CAD (KiCad official)

Symbol: GN1651
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`gn1651.step`	217 KB	You want the bare part, or you mark your own boards.
`gn1651-etched.step`	1.8 MB	You want the part with `GN1651` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 456 faces against 267 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 (10 pp, sha256 e16a08f768bb8b9c, 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