ST232ECW Overview
5 V is the best voltage setting for maximum efficiency. It is made possible by the maximum operating temperature of 70 °C°C, enabling stable operation. To ensure reliability, it requires a minimum temperature of 0 °C degrees Celsius. Among these transceivers there is a 1 transceiver. Despite a supply voltage of 5.5 VV, it can withstand it. There is no need to worry about the source voltage of 4.5 V since the device can work with a low voltage.
ST232ECW Features

ST232ECW Applications
There are a lot of STMicroelectronics
ST232ECW Controllers Interface ICs applications.

Dimming Control Devices
Commercial LED Lighting
Smart LED Lighting
Portable Appliances
Battery-Operated Devices
Cellular Data Devices
Factory Automation and Process Controls
IrDA transmission control
Remote transmission formatter
Docking

RoHS	Compliant
Max Operating Temperature	70 °C
Min Operating Temperature	0 °C
Operating Supply Voltage	5 V
Interface	RS-232
Max Supply Voltage	5.5 V
Min Supply Voltage	4.5 V
Nominal Supply Current	10 mA
Logic Function	Receiver
Data Rate	400 kbps
Number of Transceivers	1
Number of Receivers	2
Number of Transmitters	2
Radiation Hardening	No