THVD1500DR [Texas Instruments]

THVD1500 is a robust half-duplex RS-485 transceiver for industrial applications. The bus pins are immune to high levels of IEC Contact Discharge ESD events eliminating need of additional system level protection components.

The device operates from a single 5-V supply. The wide common-mode voltage range and low input leakage on bus pins make THVD1500 suitable for multi-point applications over long cable runs.

THVD1500 is available in industry standard 8-pin SOIC package for drop-in compatibility. The device is characterized from –40°C to 125°C.

• Meets or Exceeds the Requirements of the TIA/EIA-485A Standard and the State Grid Corporation of China (SGCC) Part 11 Serial Communication Protocol RS-485 Standard
• 4.5 V to 5.5 V Supply Voltage
• Half-Duplex RS-422/RS-485
• Bus I/O Protection
  • ± 16 kV HBM ESD
  • ± 8 kV IEC 61000-4-2 Contact Discharge
  • ± 10 kV IEC 61000-4-2 Air Gap Discharge
  • ± 2 kV IEC 61000-4-4 Fast Transient Burst
• Extended Industrial Temperature Range: -40°C to 125°C
• Large Receiver Hysteresis for Noise Rejection
• Low Power Consumption
  • Low Standby Supply Current: < 1 µA
  • Quiescent During Operation: < 660 µA
• Glitch-Free Power-Up/Down for Hot Plug-in Capability
• Open, Short, and Idle Bus Failsafe
• 1/8 Unit Load Options (Up to 256 Bus Nodes)
• Low EMI 500 kbps

Key Features

1. Half-duplex RS-485 transceiver
THVD1500 supports half-duplex RS-485 communication, meaning transmission and reception share the same differential bus pair. This is suitable for two-wire RS-485 networks used in industrial and building automation systems.

2. 5V single-supply operation
The device operates from a single 5V supply, making it suitable for traditional industrial control boards and RS-485 systems using 5V logic/power rails.

3. Up to 500kbps data rate
The THVD1500 supports data rates up to 500kbps, which is suitable for many industrial control, metering, automation, and low- to medium-speed serial communication networks.

4. ±8kV IEC ESD protection
The bus pins provide ±8kV IEC 61000-4-2 contact-discharge ESD protection, improving robustness in industrial environments where connectors, cables, and field wiring may be exposed to ESD events.

5. Suitable for long cable and multi-point networks
TI states that the device’s wide common-mode voltage range and low bus-pin leakage make it suitable for multi-point applications over long cable runs. This is important for RS-485 networks in factories, buildings, and distributed control systems.

6. Industrial communication robustness
Because it is designed for industrial applications, THVD1500 is useful in electrically noisy environments where differential signaling, ESD immunity, and reliable bus communication are important.

7. Reduced need for external ESD protection
TI notes that the high IEC ESD immunity of the bus pins can eliminate the need for additional system-level protection components in some designs, helping reduce BOM cost and PCB area.