STMicroelectronics

ST3232CD

ST3232CD Description

The ST3232CD from STMicroelectronics is a 3V to 5.5V-powered, full-duplex RS-232 transceiver designed for robust serial communication in industrial and embedded systems. This 2-driver/2-receiver IC supports data rates up to 400kbps, making it suitable for moderate-speed data transmission. Housed in a 16-pin SO package, it features 300mV receiver hysteresis for improved noise immunity in electrically noisy environments. The device is RoHS3 compliant and adheres to REACH regulations, ensuring environmental and safety compliance. Though marked obsolete, it remains a reliable choice for legacy systems requiring stable RS-232 interfacing.

ST3232CD Features

• Wide Voltage Range: Operates from 3V to 5.5V, enabling compatibility with both 3.3V and 5V systems.
• Enhanced Noise Immunity: 300mV receiver hysteresis minimizes signal errors in high-noise conditions.
• Compact & Robust: Surface-mount 16-SO package saves board space while ensuring durability.
• Compliance: ROHS3 and REACH unaffected, meeting stringent environmental standards.
• Legacy Support: Ideal for maintaining or upgrading older RS-232-based systems.

ST3232CD Applications

• Industrial Automation: Reliable communication in PLCs, motor controllers, and sensor interfaces.
• Embedded Systems: Legacy device interfacing in medical equipment, test instruments, and POS terminals.
• Telecom Infrastructure: Backup or auxiliary serial links in networking hardware.
• Consumer Electronics: Low-cost RS-232 solutions for set-top boxes or diagnostic tools.

Conclusion of ST3232CD

The ST3232CD balances performance, noise resilience, and broad compatibility, making it a pragmatic choice for systems requiring dependable RS-232 communication. While newer alternatives exist, its simplicity, compliance, and proven design ensure continued relevance in legacy and cost-sensitive applications. Engineers valuing stable operation in noisy environments will find this transceiver a dependable solution.