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SN65HVD82DR

3.3V RS-485 transceiver, 1Mbps, 256 nodes, +-16kV ESD, SOIC-8

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Manufacturer Part：

SN65HVD82DR

Package：

SOIC-8 (4.9 x 3.9 x 1.75 mm)

Brand：

Product Categories：

Integrated Circuits ICs, Interface ICs

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Description

Product Overview

The SN65HVD82DR from Texas Instruments is a 3.3-V RS-485 transceiver with IEC ESD protection, designed for robust industrial communication. Packaged in an 8-pin SOIC, it provides half-duplex communication with a 1/8 unit load allowing up to 256 nodes on a single bus, and features extended common-mode range for noisy environments.

Key Specifications

Supply Voltage	3.3 V
Data Rate	Up to 1 Mbps
Bus Nodes (max)	256 (1/8 unit load)
Common-Mode Range	-20 V to 25 V
ESD Protection	IEC 61000-4-2, +-16 kV
Operating Temperature	-40 to 85 degC
Package	SOIC-8 (4.9 x 3.9 mm)

Features

IEC 61000-4-2 ESD protection: +-16 kV on bus pins
1/8 unit load allows up to 256 nodes on bus
Extended common-mode range: -20 V to 25 V
Half-duplex operation with enable pins
Open-circuit fail-safe receiver
Thermal shutdown protection

Applications

Industrial automation fieldbus
Building automation and HVAC
Motor drive communication
Grid infrastructure monitoring
Process control networks

Product Introduction:SN65HVD82DR Product Introduction

The SN65HVD82DR from Texas Instruments is a 3.3-V RS-485 transceiver designed for robust industrial communication networks. It meets IEC 61000-4-2 ESD standards with +-16 kV protection on bus pins, providing exceptional immunity in electrically harsh environments. The 1/8 unit load specification allows up to 256 nodes on a single bus without signal degradation. An extended common-mode range of -20 V to 25 V ensures reliable communication in the presence of ground potential differences. Open-circuit fail-safe receiver logic ensures the receiver output is high when the bus is idle.

Working Principle:SN65HVD82DR Working Principle

The SN65HVD82DR operates as a half-duplex RS-485 transceiver with separate driver enable (DE) and receiver enable (RE) pins. The driver converts single-ended TTL/CMOS logic levels to differential RS-485 signals on the A and B bus pins. The receiver converts differential RS-485 signals back to single-ended logic. When both driver and receiver are disabled, the device enters a low-power standby mode. The fail-safe receiver design ensures the output remains high when the bus lines are open, shorted, or idle. The extended common-mode range is achieved through robust input stage design that can tolerate large ground shifts between nodes.

Pin Description:SN65HVD82DR Pin Definition and Functions

Pin	Name	Type	Function
1	R	Output	Receiver output
2	RE	Input	Receiver enable (active low)
3	DE	Input	Driver enable (active high)
4	D	Input	Driver input
5	GND	Power	Ground
6	A	I/O	Non-inverting bus pin
7	B	I/O	Inverting bus pin
8	VCC	Power	3.3 V supply

Application Scenarios:In which products and applications isSN65HVD82DR used

Industrial automation and fieldbus networks (Modbus, Profibus)
Building automation and HVAC control systems
Motor drive and inverter communication links
Smart grid and utility monitoring infrastructure
Process control and SCADA communication networks

Alternative Models:What chips are recommended as replacements for SN65HVD82DR

Manufacturer	Part Number	Package	Notes
TI	SN65HVD75DR	SOIC-8	5V RS-485, 20 Mbps
TI	THVD1450DR	SOIC-8	3.3/5V, 500 kbps, newer
Analog Devices	ADM3083EARZ	SOIC-8	3.3V RS-485 with ESD
Maxim	MAX3485ECSA+	SOIC-8	3.3V, 10 Mbps equivalent
NXP	SP3485CN-L/TR	SOIC-8	3.3V RS-485 transceiver