Overview
The THVD1400DR, produced by Texas Instruments, is a robust half-duplex RS-485 transceiver designed for industrial applications. This device meets or exceeds the requirements of the TIA/EIA-485A standard and operates from a single 3 to 5.5-V supply voltage. It is available in both SOIC-8 and small SOT-8 packages, making it suitable for space-constrained designs. The THVD1400DR is characterized for ambient temperatures ranging from –40°C to 125°C, ensuring reliability in a wide range of environmental conditions.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | 5 | 5.5 | V |
| Differential Input Voltage (VID) | -12 | 12 | V | |
| Input Voltage at Any Bus Terminal (VI) | -7 | 12 | V | |
| High-Level Input Voltage (VIH) | 2 | 5.5 | V | |
| Low-Level Input Voltage (VIL) | 0 | 0.8 | V | |
| Output Current (IO) | -60 | 60 | mA | |
| Differential Load Resistance (RL) | 54 | 60 | Ω | |
| Signaling Rate | 500 | kbps | ||
| Junction Temperature (TJ) | -40 | 150 | °C | |
| Operating Ambient Temperature (TA) | -40 | 125 | °C |
Key Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard.
- Operates from a single 3 to 5.5-V supply voltage.
- Half-duplex RS-422/RS-485 transceiver with a data rate of up to 500 kbps.
- Bus I/O protection including ±16-kV HBM ESD, ±12-kV IEC 61000-4-2 Contact discharge, ±15-kV IEC 61000-4-2 Air gap discharge, and ±4-kV IEC 61000-4-4 Fast transient burst.
- ±16-V bus fault protection (absolute max voltage on bus pins).
- Small, space-saving 8-pin SOT package option (2.1 mm x 1.2 mm) and SOIC-8 package.
- Extended industrial temperature range: -40°C to 125°C.
- Large receiver hysteresis for noise rejection.
- Low power consumption with low standby supply current (< 1 µA) and quiescent current during operation (1.5 mA typ).
- 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).
Applications
- Factory automation & control.
- Building automation.
- Grid infrastructure.
- Motor drives.
- Power delivery.
- Industrial transport.
- HVAC systems.
- Video surveillance.
- Smart meters.
Q & A
- What is the operating supply voltage range of the THVD1400DR?
The THVD1400DR operates from a single 3 to 5.5-V supply voltage.
- What are the data rates supported by the THVD1400DR?
The THVD1400DR supports data rates up to 500 kbps.
- What kind of ESD protection does the THVD1400DR offer?
The device offers ±16-kV HBM ESD, ±12-kV IEC 61000-4-2 Contact discharge, ±15-kV IEC 61000-4-2 Air gap discharge, and ±4-kV IEC 61000-4-4 Fast transient burst protection.
- What are the package options available for the THVD1400DR?
The device is available in both SOIC-8 and small SOT-8 packages.
- What is the operating temperature range of the THVD1400DR?
The device operates over an ambient temperature range of -40°C to 125°C.
- Does the THVD1400DR support hot plug-in capability?
Yes, it supports glitch-free power-up/down for hot plug-in capability.
- What is the standby supply current of the THVD1400DR?
The standby supply current is less than 1 µA.
- How many bus nodes can the THVD1400DR support?
The device can support up to 256 bus nodes as a 1/8 unit load.
- What kind of bus fault protection does the THVD1400DR offer?
The device offers ±16-V bus fault protection (absolute max voltage on bus pins).
- Does the THVD1400DR have failsafe features for bus conditions?
Yes, it has open, short, and idle bus failsafe features.
- What is the typical quiescent current during operation of the THVD1400DR?
The typical quiescent current during operation is 1.5 mA.
