SN65HVD20DRG4

Drivers, Receivers, Transceivers Overview

The SN65HVD20DRG4 is a half-duplex RS-485 transceiver from Texas Instruments, operating on a single 5-V supply (4.5 V to 5.5 V). It supports signaling rates up to 25 Mbps and accommodates networks of up to 64 nodes. The device features an extended common-mode voltage range of –20 V to +25 V, exceeding standard TIA/EIA-485 requirements. It includes bus I/O protection rated for over 16-kV HBM and a failsafe receiver that ensures a high-level output during open-circuit or idle-bus conditions. The unit operates within a temperature range of –40°C to +85°C and is housed in an SOIC-8 package.

Drivers, Receivers, Transceivers Feature Summary

• Extended common-mode voltage range supporting severe electrical environments
• Integrated failsafe receiver for reliable operation under fault conditions
• High electrostatic discharge protection on bus terminals

Drivers, Receivers, Transceivers Applications

• Long cable solutions in factory automation
• Security networks and building HVAC systems
• Electrical power inverters and industrial drives
• Avionics and environmental control systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the component against official Texas Instruments documentation to confirm pinout compatibility and electrical specifications. Ensure the SOIC-8 package dimensions match the target PCB footprint. Cross-reference the revision history to validate the manufacturing date code and any potential design changes affecting performance or reliability.

Drivers, Receivers, Transceivers Selection Notes

Select this model for applications requiring robust performance in electrically noisy environments with significant ground potential differences. It is suitable for multipoint twisted-pair networks where long cable runs are necessary. Consider the node limit of 64 when designing the network topology. Verify that the 5-V supply voltage aligns with the system power architecture.

Drivers, Receivers, Transceivers Part Context

This component belongs to the SN65HVD2x family of extended common-mode RS-485 transceivers. The family includes variants like the SN65HVD23 and SN65HVD24, which offer receiver equalization for longer distances. The SN65HVD20 specifically targets high-speed data transmission up to 25 Mbps with a moderate node count, distinguishing it from slew-rate limited versions in the same series.

Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes within the same family include the SN65HVD20D and SN65HVD20P. Other models such as the SN65HVD21 or SN65HVD23 may serve as alternatives if different node counts or equalization features are required, provided the interface and voltage levels remain compatible.

Drivers, Receivers, Transceivers FAQ

What is the maximum number of nodes supported by the SN65HVD20?

The SN65HVD20 supports up to 64 nodes on the bus.

How does the failsafe receiver function?

The failsafe receiver provides a high-level output within 250 microseconds after the loss of the input signal, preventing noise from being interpreted as valid data during open-circuit or idle-bus conditions.

What is the common-mode voltage range?

The device operates with a common-mode voltage range of –20 V to +25 V.