Overview
The THVD1450D is a 3.3-V to 5-V RS-485 transceiver manufactured by Texas Instruments. It is part of the THVD14xx family, designed to operate in rugged industrial environments. These devices are robust against high levels of IEC electrical fast transients (EFT) and electrostatic discharge (ESD) events, eliminating the need for additional system-level protection components. The THVD1450D operates from a single supply between 3 V and 5.5 V and features an extended common-mode voltage range, making it suitable for multi-point applications over long cable runs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3 V to 5.5 V | V |
| Differential Output Voltage | 1.5 to 3.5 V | V |
| ESD Protection | ±18 kV IEC 61000-4-2 Contact Discharge, ±25 kV IEC 61000-4-2 Air-Gap Discharge, ±4 kV IEC 61000-4-4 Fast Transient Burst | kV |
| Common-mode Voltage Range | ±15 V | V |
| Data Rates | 500 kbps and 50 Mbps | bps |
| Standby Supply Current | < 1 µA | µA |
| Operating Supply Current | < 3 mA | mA |
| Ambient Temperature Range | –40°C to 125°C | °C |
| Package Options | VSON, VSSOP, SOIC (8 pins) |
Key Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard
- Differential output exceeds 2.1 V for PROFIBUS compatibility with a 5-V supply
- Low EMI at 500 kbps and 50 Mbps data rates
- Large receiver hysteresis for noise rejection
- Low power consumption with standby supply current < 1 µA and operating current < 3 mA
- Glitch-free power-up/down for hot plug-in capability
- Open, short, and idle bus failsafe
- 1/8 unit load (up to 256 bus nodes)
- Small-size VSON and VSSOP packages for space-constrained applications
Applications
- Motor Drives
- Factory Automation & Control
- Grid Infrastructure
- Building Automation
- HVAC Systems
- Video Surveillance
- Process Analytics
- Wireless Infrastructure
Q & A
- What is the supply voltage range of the THVD1450D?
The supply voltage range is 3 V to 5.5 V. - What level of ESD protection does the THVD1450D offer?
The device offers ±18 kV IEC 61000-4-2 Contact Discharge, ±25 kV IEC 61000-4-2 Air-Gap Discharge, and ±4 kV IEC 61000-4-4 Fast Transient Burst protection. - What are the data rates supported by the THVD1450D?
The device supports data rates of 500 kbps and 50 Mbps. - What is the standby supply current of the THVD1450D?
The standby supply current is less than 1 µA. - What is the operating temperature range of the THVD1450D?
The device operates over an ambient temperature range from –40°C to 125°C. - What package options are available for the THVD1450D?
The device is available in VSON, VSSOP, and SOIC (8 pins) packages. - Does the THVD1450D meet industry standards for RS-485 transceivers?
Yes, it meets or exceeds the requirements of the TIA/EIA-485A standard. - How does the THVD1450D handle bus failsafe conditions?
The device features open, short, and idle bus failsafe, ensuring the receiver output remains logic high under these conditions. - What is the maximum number of bus nodes supported by the THVD1450D?
The device supports up to 256 bus nodes as a 1/8 unit load. - Is the THVD1450D suitable for multi-point applications over long cable runs?
Yes, due to its extended common-mode voltage range, it is suitable for multi-point applications over long cable runs.
