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CH432T

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WCH Jiangsu Qin Heng RS232 ICs, SSOP-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CH432T

WCH Jiangsu Qin Heng · RS232 ICs · SSOP-20-208mil

CH432T from WCH Jiangsu Qin Heng, in a SSOP-20-208mil. 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
1 INT# output Active-low open-drain interrupt request output that is the NOR of the INT0 and INT1 channel interrupts and may need an external pull-up.
2 SCS# input SPI chip select input, active low, that frames each SPI transaction.
3 GND power_in Common ground for the chip.
4 TXD output Asynchronous serial data output for serial port 0.
5 RTS output Port 0 request-to-send modem output, active low; in half-duplex mode it indicates the data-sending state, active high.
6 RXD input Asynchronous serial data input for serial port 0 with an internal weak pull-up.
7 RI input Port 0 modem ring-indicator input, active low, with an internal weak pull-up.
8 CTS input Port 0 modem clear-to-send input, active low, with an internal weak pull-up; used for hardware flow control when AFE is set.
9 XI input Crystal oscillator input, or external clock input when no crystal is fitted; the datasheet gives a range of 0.9216 MHz to 32 MHz with 22.1184 MHz as the default.
10 XO output Inverting crystal oscillator output that requires a crystal and load capacitor to ground.
11 TXD1 output Asynchronous serial data output for serial port 1.
12 HLF# input Half-duplex mode enable, active low, with an internal weak pull-up; tie low for half-duplex operation.
13 RXD1 input Asynchronous serial data input for serial port 1 with an internal weak pull-up.
14 CTS1 input Port 1 modem clear-to-send input, active low, with an internal weak pull-up; used for hardware flow control when AFE is set.
15 RTS1 output Port 1 request-to-send modem output, active low; in half-duplex mode it indicates the data-sending state, active high.
16 SDO tri_state SPI serial data output that is tri-stated and driven only after a read command is received; it may be tied to SDI through a series resistor of a few hundred ohms.
17 SDI input SPI serial data input, sampled on the SCK rising edge, MSB first.
18 VCC power_in Positive power supply; the datasheet gives an operating range of 3.3 V to 5.3 V with an absolute maximum of 6.0 V.
19 GND power_in Common ground for the chip.
20 SCK input SPI serial clock input; the chip samples data on the rising edge and drives SDO on the falling edge.

Key specifications

Parameter Value
Manufacturer WCH Jiangsu Qin Heng
Package SSOP-20-208mil
Category Interface
Pins 20

CAD (KiCad official)

  • Symbol: CH432T
  • Footprint: Package_SO:SSOP-20_5.3x7.2mm_P0.65mm
  • 3D model: SSOP-20-208mil (KiCad packages3D, STEP)
  • 3D model files: ch432t-etched.step / ch432t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch432t.step / ch432t.glb are the bare package body.

Provenance

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

  • Datasheet: WCH Jiangsu Qin Heng datasheet (14 pp, sha256 8d4eacb348ae35b0, retrieved 2026-10-18, 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