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CH446X

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WCH(南京沁恒) Analog Switches, Multiplexers, LQFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CH446X

WCH(南京沁恒) · Analog Switches, Multiplexers · LQFP-44(10x10)

CH446X from WCH(南京沁恒), in a LQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
38 VDD power_in Positive supply; voltage must be greater than or equal to GND.
12 GND power_in Common ground and digital signal reference, 0 V.
16 VEE power_in Negative supply; voltage must be less than or equal to GND.
41 RST input External manual reset input, active high; a high level clears all latches to 0 so all analog switches are open.
36 DAT input Serial data input and switch data input; when used as switch data, high turns the switch on and low turns it off.
14 STB input Strobe input, active high; its high pulse generates the ACT pulse that writes DAT into the latch selected by the address.
34 CS/CK input Serial clock input, active on the rising edge; seven rising edges shift in the 7-bit address.
31 X0 passive Analog signal input/output, X port of the 5x24 switch matrix.
30 X1 passive Analog signal input/output, X port of the 5x24 switch matrix.
29 X2 passive Analog signal input/output, X port of the 5x24 switch matrix.
28 X3 passive Analog signal input/output, X port of the 5x24 switch matrix.
27 X4 passive Analog signal input/output, X port of the 5x24 switch matrix.
26 X5 passive Analog signal input/output, X port of the 5x24 switch matrix.
3 X6 passive Analog signal input/output, X port of the 5x24 switch matrix.
4 X7 passive Analog signal input/output, X port of the 5x24 switch matrix.
5 X8 passive Analog signal input/output, X port of the 5x24 switch matrix.
6 X9 passive Analog signal input/output, X port of the 5x24 switch matrix.
7 X10 passive Analog signal input/output, X port of the 5x24 switch matrix.
8 X11 passive Analog signal input/output, X port of the 5x24 switch matrix.
25 X12 passive Analog signal input/output, X port of the 5x24 switch matrix.
24 X13 passive Analog signal input/output, X port of the 5x24 switch matrix.
1 X14 passive Analog signal input/output, X port of the 5x24 switch matrix.
2 X15 passive Analog signal input/output, X port of the 5x24 switch matrix.
33 X16 passive Analog signal input/output, X port of the 5x24 switch matrix.
35 X17 passive Analog signal input/output, X port of the 5x24 switch matrix.
37 X18 passive Analog signal input/output, X port of the 5x24 switch matrix.
39 X19 passive Analog signal input/output, X port of the 5x24 switch matrix.
17 X20 passive Analog signal input/output, X port of the 5x24 switch matrix.
15 X21 passive Analog signal input/output, X port of the 5x24 switch matrix.
13 X22 passive Analog signal input/output, X port of the 5x24 switch matrix.
11 X23 passive Analog signal input/output, X port of the 5x24 switch matrix.
43 Y0 passive Analog signal input/output, Y port of the 5x24 switch matrix.
18 Y1 passive Analog signal input/output, Y port of the 5x24 switch matrix.
19 Y2 passive Analog signal input/output, Y port of the 5x24 switch matrix.
42 Y3 passive Analog signal input/output, Y port of the 5x24 switch matrix.
20 Y4 passive Analog signal input/output, Y port of the 5x24 switch matrix.
9 NC unconnected Unused pin; must not be connected.
10 NC unconnected Unused pin; must not be connected.
21 NC unconnected Unused pin; must not be connected.
40 NC unconnected Unused pin; must not be connected.
22 NC unconnected Unused pin; must not be connected.
23 NC unconnected Unused pin; must not be connected.
32 NC unconnected Unused pin; must not be connected.
44 NC unconnected Unused pin; must not be connected.

Key specifications

Parameter Value
Manufacturer WCH(南京沁恒)
Package LQFP-44(10x10)
Category Interface
Pins 44

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Operating ambient temperature (absolute maximum table) TA -40 85 ℃ 6
Storage ambient temperature (absolute maximum table) TS -55 125 ℃ 6
VDD supply voltage (absolute maximum) VDD -0.5 16 V VEE=GND=0V 6
VEE supply voltage (absolute maximum) VEE -16 0.5 V VDD=GND=0V 6
Continuous current per analog switch Isw 0 15 mA 6
Sum of continuous current, all analog switches Iall 0 100 mA 6
VDD supply voltage (recommended) VDD 4 13.2 V GND=0V, VDD-VEE less than 13.2V 6
VEE supply voltage (recommended) VEE -8.8 0 V 6
Quiescent supply current, all digital pins at VDD or GND ICC0 1 100 uA TA=25℃, VDD=12V, GND=0V, VEE=0V, switch voltage 0.4V 6
Quiescent supply current, VDD=5V ICC5 0.4 1.5 mA TA=25℃, VDD=5V, all digital pins 6
Quiescent supply current, all digital pins ICC12 5 15 mA TA=25℃, VDD=12V, GND=0V, VEE=0V, switch voltage 0.4V 6
Digital input low-level voltage, VDD-GND=5V VIL -0.5 0.8 V VDD-GND=5V 6
Digital input high-level voltage, VDD-GND=5V VIH 2 V VDD-GND=5V 6
Digital input high-level voltage VIH12 3.3 V TA=25℃, VDD=12V, GND=0V, VEE=0V, switch voltage 0.4V 6
Digital pin input leakage current ILEAK 0.1 10 uA TA=25℃, VDD=12V, GND=0V, VEE=0V, switch voltage 0.4V 6
Analog switch leakage current, switch off IOFF 1 500 nA TA=25℃, VDD=12V, GND=0V, VEE=0V, switch voltage 0.4V; printed as ±1 and ±500 6
Analog switch on-resistance, 25℃ RON12 45 65 Ω VDD-VEE=12V, 25℃ 6
Analog switch on-resistance, 85℃ RON12T 55 80 Ω VDD-VEE=12V, 85℃ 6
Analog switch on-resistance, 25℃ RON5 120 185 Ω VDD-VEE=5V, 25℃ 6
Analog switch on-resistance, 85℃ RON5T 150 225 Ω VDD-VEE=5V, 85℃ 6
On-resistance difference between switches ΔRON 5 10 Ω VDD-VEE=12V 6
Analog switch port pin capacitance CSW 10 25 pF F=1MHz 7
Analog switch feedthrough capacitance CFT 0.5 pF F=1MHz 7
Analog switch frequency response, 3dB F3DB 50 MHz RL=3kΩ 7
Analog switch signal propagation delay TPS 12 30 nS RL=1KΩ, CL=50pF 7
Digital data input pin capacitance CDI 7 15 pF F=1MHz 7
Parallel address setup time to STB rising edge TPAS 8 nS 7
Parallel address hold time after STB falling edge TPAH 6 nS 7
DAT address setup time to CS/CK rising edge TAS 7 nS 7
DAT address hold time after CS/CK rising edge TAH 3 nS 7
DAT data setup time to STB falling edge TDS 8 nS 7
DAT data hold time after STB falling edge TDH 6 nS 7
CS/CK rising edge setup time to STB rising edge TCS 10 nS 7
CS/CK rising edge hold time to STB falling edge TCH 7 nS 7
CS/CK clock low pulse width TCKL 10 nS 7
CS/CK clock high pulse width TCKH 10 nS 7
STB high-level active pulse width TSTB 10 nS 7
RST high-level active pulse width TRST 15 nS 7
DAT, STB or RST to analog switch execution delay TSW 5 30 70 nS 7

CAD (KiCad official)

  • Symbol: CH446X
  • Footprint: Package_QFP:LQFP-44_10x10mm_P0.8mm
  • 3D model: LQFP-44(10x10) (KiCad packages3D, STEP)
  • 3D model files: ch446x-etched.step / ch446x-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch446x.step / ch446x.glb are the bare package body.

Provenance

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

  • Datasheet: WCH(南京沁恒) datasheet (9 pp, sha256 a9328434d05a6080, retrieved 2026-10-20, 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: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF