CH455G from WCH Jiangsu Qin Heng, 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	SEG4	bidirectional	Segment 4 driver output (active-high, drives segment E of a common-cathode 7-seg digit) and row-4 key-scan input (active-high, with internal pull-down). Continuous drive current up to 40 mA per SEG pin.
2	SEG5	bidirectional	Segment 5 driver output (active-high, drives segment F) and row-5 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG.
3	SEG6	bidirectional	Segment 6 driver output (active-high, drives segment G) and row-6 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG.
4	SEG7/INT#	output	In 8-segment mode: decimal-point segment driver (active-high). In 7-segment mode (typical for CH455G, which lacks a dedicated INT# pin): active-low keyboard interrupt output equivalent to INT#. Mode is chosen by the 7SEG bit of the Set System Parameter command.
5	DIG0	output	Digit 0 drive (active-low, sinks common-cathode digit current up to 200 mA) during display scan; column-scan output (active-high) during keypad scan.
6	SCL	input	2-wire serial clock input, I2C-compatible, up to 4 MHz. Internal pull-up (typ 200 uA); default high. Data is latched on rising edge.
7	SDA	bidirectional	2-wire serial data, I2C-compatible open-drain with internal pull-up (typ 300 uA); default high. MSB-first; sampled on SCL rising edge, driven on SCL falling edge.
8	GND	power_in	Common ground return; must sustain continuous current of at least 150 mA to sink the aggregated segment/digit drive current.
9	DIG1	output	Digit 1 drive (active-low, up to 200 mA cathode sink) during display scan; column-scan output (active-high) during keypad scan.
10	DIG2	output	Digit 2 drive (active-low, up to 200 mA cathode sink) during display scan; column-scan output (active-high) during keypad scan.
11	DIG3	output	Digit 3 drive (active-low, up to 200 mA cathode sink) during display scan; column-scan output (active-high) during keypad scan.
12	SEG0	bidirectional	Segment 0 driver output (active-high, drives segment A) and row-0 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG.
13	SEG1	bidirectional	Segment 1 driver output (active-high, drives segment B) and row-1 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG.
14	VCC	power_in	Positive supply, 2.5 V to 5.3 V (recommended 2.7-5 V). Must sustain continuous current of at least 150 mA; decouple with 0.1 uF ceramic and >=100 uF bulk capacitor close to the pin.
15	SEG2	bidirectional	Segment 2 driver output (active-high, drives segment C) and row-2 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG.
16	SEG3	bidirectional	Segment 3 driver output (active-high, drives segment D) and row-3 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG.

Key specifications

Parameter	Value
Manufacturer	WCH Jiangsu Qin Heng
Package	SOP-16
Category	LED-drv
Pins	16

Ordering variants

Same part, different packaging or reel option.

CH455G
CH455K
CH455H

CAD (KiCad official)

Symbol: CH455G
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
`ch455g.step`	217 KB	You want the bare part, or you mark your own boards.
`ch455g-etched.step`	1.9 MB	You want the part with `CH455G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 474 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: WCH Jiangsu Qin Heng datasheet (9 pp, sha256 3a6969e2dfa69978, 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