Overview
The THVD1428DR is a 3.3-V to 5-V RS-485 transceiver designed by Texas Instruments. This device is notable for its integrated surge protection, making it highly robust against various forms of electrical transients. It operates in half-duplex mode and supports data transmission rates up to 20 Mbps. The THVD1428DR is packaged in an industry-standard 8-pin SOIC (D) package, ensuring easy drop-in compatibility without requiring any PCB changes. It is characterized over an extended ambient temperature range of -40°C to 125°C, enhancing its suitability for a wide range of industrial and commercial applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | - | 5.5 | V |
| Bus Voltage Range | -15 | - | 15 | V |
| Input Voltage Range (Logic Pins) | -0.3 | - | 5.7 | V |
| Receiver Output Current (IO) | -24 | - | 24 | mA |
| Storage Temperature Range | -65 | - | 150 | ℃ |
| ESD Protection (HBM) | - | - | ±16 kV | - |
| ESD Protection (IEC 61000-4-2 Contact Discharge) | - | - | ±4 kV | - |
| Surge Protection (IEC 61000-4-5) | - | - | ±3 kV | - |
| Signaling Rate | - | - | 20 Mbps | - |
| Operating Ambient Temperature Range | -40 | - | 125 | ℃ |
| Standby Supply Current | - | - | < 2 µA | - |
| Driver and Receiver Enabled Supply Current | - | - | < 3 mA | - |
Key Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard
- Operates from a single 3.3-V to 5-V supply
- Integrated surge protection with ±3 kV surge capability
- Bus I/O protection: ±16 kV HBM ESD, ±4 kV IEC 61000-4-2 contact discharge, ±8 kV IEC 61000-4-2 air-gap discharge, ±4 kV IEC 61000-4-4 electrical fast transient
- Supports data transmission rates up to 20 Mbps
- Extended ambient temperature range: -40°C to 125°C
- Extended operational common-mode range: ±12 V
- Receiver hysteresis for noise rejection: 30 mV
- Low power consumption: Standby supply current < 2 µA, current during operation < 3 mA
- Glitch-free power-up/down for hot plug-in capability
- Open, short, and idle bus fail-safe
- 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 and control
- Grid infrastructure
- Smart meters
- Process analytics
- Video surveillance
Q & A
- What is the operating voltage range of the THVD1428DR?
The THVD1428DR operates from a single 3.3-V to 5-V supply.
- What is the maximum data transmission rate supported by the THVD1428DR?
The device supports data transmission rates up to 20 Mbps.
- What kind of ESD protection does the THVD1428DR offer?
The device offers ±16 kV HBM ESD protection and ±4 kV IEC 61000-4-2 contact discharge protection.
- What is the ambient temperature range for the THVD1428DR?
The device operates over an ambient temperature range of -40°C to 125°C.
- Does the THVD1428DR have integrated surge protection?
Yes, the device has integrated surge protection with ±3 kV surge capability.
- What is the standby supply current of the THVD1428DR?
The standby supply current is less than 2 µA when both the driver and receiver are disabled.
- Is the THVD1428DR compatible with existing PCB designs?
Yes, it is packaged in an industry-standard 8-pin SOIC package, ensuring drop-in compatibility without any PCB changes.
- What are some common applications for the THVD1428DR?
Common applications include wireless infrastructure, building automation, HVAC systems, factory automation, grid infrastructure, smart meters, process analytics, and video surveillance.
- Does the THVD1428DR have failsafe receiver functionality?
Yes, the differential receiver is failsafe to invalid bus states such as open bus conditions, shorted bus conditions, and idle bus conditions.
- How many bus nodes can be connected using the THVD1428DR?
Up to 256 bus nodes can be connected due to its 1/8 unit load capability.
