STMicroelectronics

ST232CD

ST232CD Description

The ST232CD from STMicroelectronics is a full-duplex RS-232 transceiver designed for reliable serial communication in industrial and embedded systems. Housed in a 16-pin SO package, this surface-mount IC integrates 2 drivers and 2 receivers, supporting data rates up to 220 kbps with a wide supply voltage range of 4.5V to 5.5V. It operates within a 0°C to 70°C temperature range, making it suitable for moderate environments. The device features 500 mV receiver hysteresis for enhanced noise immunity, ensuring stable signal integrity in electrically noisy conditions.

ST232CD Features

• Full-Duplex Operation: Enables simultaneous transmission and reception for efficient bidirectional communication.
• Robust RS-232 Compliance: Meets standard RS-232 voltage levels (±5V to ±15V) for compatibility with legacy systems.
• Low Power Consumption: Optimized for energy efficiency in battery-powered or portable applications.
• High Noise Immunity: Built-in hysteresis reduces errors in noisy industrial environments.
• RoHS3 & REACH Compliant: Environmentally friendly with no hazardous substances.
• Surface-Mount Design (16-SO): Compact footprint ideal for space-constrained PCB layouts.
• Obsolete Status: While no longer in production, it remains a reliable choice for legacy designs or replacements.

ST232CD Applications

The ST232CD excels in applications requiring robust serial communication, such as:

• Industrial Automation: PLCs, motor controllers, and sensor interfaces.
• Embedded Systems: Microcontroller-to-PC communication in development boards.
• Point-of-Sale (POS) Terminals: Reliable data exchange between peripherals.
• Legacy Equipment Upgrades: Replacement for older RS-232 transceivers in maintenance scenarios.
• Telecom Infrastructure: Modems and networking devices requiring noise-resistant signaling.

Conclusion of ST232CD

The ST232CD offers a balanced combination of performance, reliability, and compliance, making it a pragmatic choice for legacy or maintenance-focused designs. Its full-duplex capability, noise resilience, and compact form factor cater to industrial and embedded applications where RS-232 remains prevalent. While marked as obsolete, its ROHS3 compliance and proven durability ensure continued suitability for specific use cases. Engineers seeking a cost-effective, battle-tested transceiver for moderate environments will find the ST232CD a dependable solution.