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WS3243FCQ

Public Made by Adom

by adom

GEC RS232 ICs, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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WS3243FCQ

GEC · RS232 ICs · QFN-32-EP(5x5)

WS3243FCQ from GEC, in a QFN-32-EP(5x5). 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 R1IN input Input of the first RS-232 receiver, accepting RS-232 level signals with an input voltage range of -18 V to +18 V and 3 kΩ to 7 kΩ input resistance.
2 R2IN input Input of the second RS-232 receiver, accepting RS-232 level signals with an input voltage range of -18 V to +18 V and 3 kΩ to 7 kΩ input resistance.
3 R3IN input Input of the third RS-232 receiver, accepting RS-232 level signals with an input voltage range of -18 V to +18 V and 3 kΩ to 7 kΩ input resistance.
4 R4IN input Input of the fourth RS-232 receiver, accepting RS-232 level signals with an input voltage range of -18 V to +18 V and 3 kΩ to 7 kΩ input resistance.
5 R5IN input Input of the fifth RS-232 receiver, accepting RS-232 level signals with an input voltage range of -18 V to +18 V and 3 kΩ to 7 kΩ input resistance.
6 T1OUT output Output of the first RS-232 driver, delivering RS-232 level signals of about ±5 V with a short-circuit current of ±60 mA.
7 T2OUT output Output of the second RS-232 driver, delivering RS-232 level signals of about ±5 V with a short-circuit current of ±60 mA.
8 T3OUT output Output of the third RS-232 driver, delivering RS-232 level signals of about ±5 V with a short-circuit current of ±60 mA.
9 NC unconnected Not connected.
10 T3IN input Input of the third TTL/CMOS driver, which drives output T3OUT.
11 T2IN input Input of the second TTL/CMOS driver, which drives output T2OUT.
12 T1IN input Input of the first TTL/CMOS driver, which drives output T1OUT.
13 R5OUT output TTL/CMOS output of the fifth RS-232 receiver.
14 R4OUT output TTL/CMOS output of the fourth RS-232 receiver.
15 R3OUT output TTL/CMOS output of the third RS-232 receiver.
16 NC unconnected Not connected.
17 R2OUT output TTL/CMOS output of the second RS-232 receiver.
18 R1OUT output TTL/CMOS output of the first RS-232 receiver.
19 R2OUTB output Non-inverting TTL output of the second RS-232 receiver; it is always enabled (TTL level output).
20 XIDLE output TTL/CMOS output indicating the XPWRSAVE or shutdown state.
21 XSD input Active-low shutdown control that turns off the drivers and the voltage converter.
22 XPWRSAVE input Driving this pin high forces the drivers enabled; SHUTDOWN must be high for this function.
23 C1N passive Negative terminal of the boost charge-pump capacitor (C1, 0.1 µF per test conditions).
24 GND power_in Ground reference for the device.
25 NC unconnected Not connected.
26 VCC power_in Supply voltage input, specified as +3 V to +5.5 V in the pin definition (recommended operating range 3 V to 5.25 V).
27 VP power_out Charge-pump generated positive voltage of +5.4 V (requires C1 and C2 network).
28 C1P passive Positive terminal of the boost charge-pump capacitor (C1, 0.1 µF per test conditions).
29 C2P passive Positive terminal of the inverting charge-pump capacitor (C2, 0.1 µF per test conditions).
30 C2N passive Negative terminal of the inverting charge-pump capacitor (C2, 0.1 µF per test conditions).
31 VN power_out Charge-pump generated negative voltage of -5.4 V.
32 NC unconnected Not connected.
33 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer GEC
Package QFN-32-EP(5x5)
Category Interface
Pins 33

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 temperature, industrial grade -40 25 85 ℃ Industrial Grade 2
Supply voltage VCC 3 5 V VCC = +3.3V 或者 VCC = +5V 2
Charge pump capacitor C1P, C1N, C2P, C2N 0.1 0.1 1 uF 2
Operating current (XPWRSAVE not enabled) 0.5 1 mA XPWRSAVE=VCC; XSD=VCC; TTL Inputs = VCC/GND, RS-232 Input = float, VCC=3.3V 2
Operating current with XPWRSAVE enabled 1 10 uA XPWRSAVE=GND; XSD=VCC; TTL Inputs = VCC/GND, RS-232 Input = float, VCC=3.3V 2
Current in SHUTDOWN mode 1 10 uA XPWRSAVE=VCC/GND; XSD=GND; TTL Inputs=VCC/GND, RS-232 Inputs=float, VCC = 3.3V 2
Driver input threshold voltage Low 0.8 V VCC = +3.3V 或者 VCC = +5V Supply; VIN = VCC and GND, TIN 2
Driver input threshold voltage High 2.4 V 2
Driver input leakage current -1 1 uA 2
Receiver output voltage Low 0.4 V IOUT = 1.6mA 2
Receiver output leakage current -10 10 uA Receiver Outputs Disabled, VOUT = VCC or GND, XSD= GND 2
Receiver input voltage swing -18 18 V TA = 25°C, VCC = 3.3V或者VCC = +5V Supply 2
Receiver input threshold voltage Low 0.8 V 2
Receiver input threshold voltage High 2.4 V 2
Receiver input resistance 3 5 7 KΩ VIN = ±18V, TA = 25°C 2
Driver output voltage amplitude -5 5 V RL = 3kΩ, All Outputs are loaded 2
Driver output resistance 300 Ω VCC = VP = VN = GND, VOUT = ±2V 2
Driver output short-circuit current -60 60 mA VOUT = GND 2
Driver output leakage current -5 5 uA Transmitter Disabled, VOUT = ±12V 2
Driver output voltage (T1OUT, T2OUT loaded) -5 5 V T1IN=T2IN=GND; T3IN=VCC; T3OUT=3kΩ; T1OUT=T2OUT=-2.5mA 3
Maximum data rate 1000 Kbps RL = 3kΩ, CL = 250pF, One Transmitter Switching, TA = 25°C 3
Transmitter slew rate limit 60 V/uS RL = 3~7kΩ, CL= 150pF to 250pF, One Transmitter Switching, TA = 25°C, Measured from 3V to -3V or -3V to 3V 3
ESD HBM, RS-232 inputs and outputs -15 15 KV RS-232 Inputs and Outputs 3
ESD EN61000-4-2 contact discharge -8 8 KV 3
ESD EN61000-4-2 air gap discharge -15 15 KV 3
Maximum working voltage VCC 7 V 6
Positive charge pump voltage VP -0.3 7 V 6
Negative charge pump voltage VN -7 0.3 V 6
Driver input pins TxIN, XEN, XSD, XPWRSAVE -0.3 7 V 6
Receiver input pins RxIN -18 18 V 6
Driver output pins TxOUT -15 15 V 6
Receiver output pins RxOUT -0.3 V 6
Storage temperature TSTG -65 150 ℃ 6
Maximum junction temperature TJ 150 ℃ 6
ESD HBM rating ESD-HBM 2000 V 6
Recommended supply voltage VDD 3 5.25 V 6
Recommended operating temperature TA -40 85 ℃ 6
Driver input hysteresis 0.5 V 2
Receiver input hysteresis 0.5 V 2
Driver input to output delay 2 uS RL=3kΩ, CL=150pF; All loaded 3
Driver output delay 2 uS 3
Driver input-to-output delay difference 100 nS 3
Driver enable to output time 400 nS 3
Driver output high to shutdown time 250 nS 3
Receiver input delay 0.15 uS CL=150pF 3
Receiver output delay 0.15 uS 3
Receiver input-to-output delay difference 50 nS 3
Receiver enable to output time 200 nS 3
Receiver output high to shutdown time 200 nS 3
Receiver input to XIDLE high 1 uS 3
Receiver input to XIDLE low 30 uS 3
Power save mode to driver enable 100 uS 3

CAD (KiCad official)

  • Symbol: WS3243FCQ
  • Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • 3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
  • 3D model files: ws3243fcq-etched.step / ws3243fcq-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ws3243fcq.step / ws3243fcq.glb are the bare package body.

Provenance

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

  • Datasheet: GEC datasheet (10 pp, sha256 2cafdfa691e32143, 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