Product details


Supply voltage(s) (Nom) (V) 5 Number of TX 2 Number of RX 2 Duplex Full Signaling rate (Max) (Mbps) 10 IEC 61000-4-2 contact (+/- kV) None HBM ESD (kV) 2 Fault protection (V) -10 to 15 Number of nodes 32 Common mode range -7 to 12 ICC (Max) (mA) 110 Isolated No Rating Catalog Operating temperature range (C) -20 to 85 Approx. price (US$) 1.90 | 1ku open-in-new Find other RS-485 & RS-422 transceivers

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOP (NS) 16 80 mm² 10.2 x 7.8 open-in-new Find other RS-485 & RS-422 transceivers


  • Meet or Exceed the Requirements of ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations V.10 and V.11
  • Designed for Multipoint Bus Transmission on Long Bus Lines in Noise Environments
  • Driver Positive- and Negative-Current Limiting
  • Thermal Shutdown Protection
  • Driver 3-State Outputs
  • Receiver Common-Mode Input Voltage Range of -12 V to 12 V
  • Receiver Input Sensitivity...±200 mV
  • Receiver Hysteresis...50 mV Typ
  • Receiver Input Impedance...12k Min
  • Receiver 3-State Outputs (SN751177 Only)
  • Operate From Single 5-V Supply
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The SN751177 and SN751178 dual differential drivers and receivers are monolithic integrated circuits that are designed for balanced multipoint bus transmission at rates up to 10 Mbit/s. They are designed to improve the performance of full-duplex data communications over long bus lines and meet ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations V.10 and V.11.

The SN751177 and SN751178 driver outputs provide limiting for both positive and negative currents and thermal-shutdown protection from line-fault conditions on the transmission bus line.

The receiver features high input impedance of at least 12k , an input sensitivity of ±200 mV over a common-mode input voltage range of -12 V to 12 V, and typical input hysteresis of 50 mV. Fail-safe design ensures that if the receiver inputs are open, the receiver outputs always will be high.

The SN751177 and SN751178 are characterized for operation from -20°C to 85°C.

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Technical documentation

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Type Title Date
* Datasheet Dual Differential Drivers And Receivers datasheet (Rev. D) May 04, 1999
Technical articles Small doesn’t mean you compromise performance when implementing signal isolation May 25, 2017
Selection guides Standard Interface Guide Nov. 21, 2014
Technical articles Upgrading the standard: a better way to drive peripherals Jun. 20, 2014
Technical articles How Thunderbolt™ 2 enables 4k video resolution Apr. 03, 2014
Technical articles Going for distance or going for speed on the RS-485 bus? Mar. 05, 2014

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RS-485 Overview

This training video provides an overview of the RS-485 standard the basics, the benefits and the reasons to choose RS-485 over other standards.

Posted: 03-Jan-2017
Duration: 19:28

View TI's RS-485 portfolio

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