RS-485 transceiver "THVD1550" with 18kV ESD protection function

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Product Pickup Interface Texas Instruments

RS-485/422 transceiver "THVD1550" with high noise immunity

The THVD1550D is an RS-485/RS-422 transceiver from Texas Instruments.

The THVD1550D is ESD protected and meets the following specifications: This makes them ideal transceivers for industrial applications that require high noise immunity.

±30kV HBM protection
±25kV IEC61000-4-2 air discharge
±18kV IEC61000-4-2 contact discharge
±4kV IEC61000-4-4 Electrical Fast Transient

This article explains the following major features and benefits of the THVD1550D.

Works in harsh industrial environments
Operates from a single 5V supply
Great for multipoint applications with long cables
Mounting area of only 4.9mm x 3.91mm

1. Works in harsh industrial environments

The bus pins of this device have built-in ESD protection as described on the previous page and are highly noise immune. Capable of operating in an operating temperature range of -40°C to 125°C for harsh industrial environments.

2. Operates from a single 5V power supply

Operates on a single 5V power supply, no need for multiple power supplies

3. Great for multipoint applications with long cables

Devices in this family have a wide common-mode voltage range (extended operating common-mode voltage: ±15V) and are less prone to device breakdown and signal degradation, making them ideal for multipoint applications with long cable runs.

4. Only 4.9mm x 3.91mm mounting area

The THVD1550D package is an SOIC 8-pin. The size is as small as 4.9 mm x 3.91 mm, so it does not take up much space.
* The package differs depending on the model name.

Evaluation module for quick development of the THVD1550D

"RS485-HF-DPLX-EVM" is a common board for SOIC-8Pin half-duplex RS485 devices. This can be used to support rapid development and analysis of data transmission systems using the THVD1550D.

Article header library 128549 pic01 1 — RS485-HF-DPLX-EVM

By setting up as shown in the figure below, you can observe the signal.

Article header library 128549 pic02 1 — Setup diagram

B and A can be measured from the transmission data input to the D input terminal "ch1" and the reception data "ch2", "ch3" and "ch4".

Article header library 128549 pic03 1 — Transceiver configuration

Application example

motor control
Factory automation control
building automation
HVAC system
video surveillance
process analysis
Communication infrastructure

Article header library 128549 pic04 1 — Application example

Product Summary

Type name

THVD1550D

specification

Meets or exceeds the requirements of the TIA/EIA-485A standard
Power supply voltage: 4.5V to 5.5V
Built-in bus I/O protection
- ±30kV HBM ESD
- ±25kV IEC 61000-4-2 ESD air discharge
- ±18kV IEC 61000-4-2 ESD Contact Discharge
- ±4kV IEC 61000-4-4 electrical fast transients
Extended Operating Common Mode Voltage: ±15V
500kbps and 50Mbps data rates with low EMI
Extended temperature range: -40°C to 125°C
Noise Rejection Due to Large Receiver Hysteresis
Low power consumption
- Low standby current consumption: less than 1 μA
- Operating current: less than 1mA
Hot plug-in capability with glitch-free power on/off
Open, Shorted, and Idle Bus Fail-Safe
1/8 unit load option (up to 256 bus nodes)
Small VSSOP package saves board space