Overview
The THVD1429DR from Texas Instruments is a high-performance, half-duplex RS-485 transceiver designed to operate over a wide range of supply voltages from 3.3 V to 5.5 V. This device is part of the THVD14x9 family, which integrates surge protection through transient voltage suppressor (TVS) diodes, enhancing reliability and immunity to noise transients in industrial and other harsh environments.
The THVD1429DR supports data rates up to 20 Mbps, making it suitable for high-speed communication applications. It is packaged in an industry-standard 8-pin SOIC package, ensuring easy drop-in compatibility without requiring PCB changes. The device operates over an extended ambient temperature range of -40°C to 125°C, making it versatile for various industrial and commercial uses.
Key Specifications
| Parameter | Test Conditions | Value | Unit |
|---|---|---|---|
| Supply Voltage | 3.3 V to 5.5 V | V | |
| Data Rate | Up to 20 Mbps | Mbps | |
| Driver Differential Output Voltage | RL = 60 Ω, -12 V ≤ Vtest ≤ 12 V | 1.5 to 3.5 V | V |
| Propagation Delay | RL = 54 Ω, CL = 50 pF | 12 to 25 ns | ns |
| ESD Protection | ± 16 kV HBM, ± 8 kV IEC 61000-4-2 Contact Discharge, ± 30 kV IEC 61000-4-2 Air-Gap Discharge | kV | |
| Electrical Fast Transient (EFT) Protection | ± 4 kV IEC 61000-4-4 | kV | |
| Surge Protection | ± 2.5 kV IEC 61000-4-5 1.2/50-μs Surge | kV | |
| Operating Temperature Range | -40°C to 125°C | °C | |
| Common-Mode Voltage Range | ± 12 V | V | |
| Standby Supply Current | < 2 µA | µA | |
| Operational Supply Current | < 3 mA | mA |
Key Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard.
- Operates from a single 3.3 V to 5.5 V supply voltage.
- Integrated surge protection with TVS diodes for enhanced reliability.
- Extended ambient temperature range: -40°C to 125°C.
- Extended operational common-mode voltage range: ± 12 V.
- Receiver hysteresis for noise rejection: 30 mV.
- Low power consumption with standby supply current < 2 µA and operational 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).
- Industry standard 8-pin SOIC package for drop-in compatibility.
Applications
- Wireless Infrastructure
- Building Automation
- HVAC Systems
- Factory Automation & Control
- Grid Infrastructure
- Smart Meters
- Process Analytics
- Video Surveillance
Q & A
- What is the operating supply voltage range of the THVD1429DR?
The THVD1429DR operates from a single 3.3 V to 5.5 V supply voltage.
- What is the maximum data rate supported by the THVD1429DR?
The THVD1429DR supports data rates up to 20 Mbps.
- What kind of ESD protection does the THVD1429DR offer?
The THVD1429DR offers ± 16 kV HBM ESD protection, ± 8 kV IEC 61000-4-2 Contact Discharge, and ± 30 kV IEC 61000-4-2 Air-Gap Discharge.
- What is the operating temperature range of the THVD1429DR?
The device operates over an ambient temperature range of -40°C to 125°C.
- Does the THVD1429DR have built-in surge protection?
Yes, the THVD1429DR has integrated surge protection through TVS diodes.
- What is the common-mode voltage range of the THVD1429DR?
The common-mode voltage range is ± 12 V.
- How much power does the THVD1429DR consume in standby mode?
The standby supply current is less than 2 µA.
- Is the THVD1429DR compatible with existing PCB designs?
Yes, it is packaged in an industry-standard 8-pin SOIC package for easy drop-in compatibility.
- What are some typical applications of the THVD1429DR?
Typical applications include wireless infrastructure, building automation, HVAC systems, factory automation, grid infrastructure, smart meters, process analytics, and video surveillance.
- Does the THVD1429DR support hot plug-in capability?
Yes, it has glitch-free power-up/down for hot plug-in capability.
