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Product Detailed Parameters
- Description：LINE TRANSCEIVER
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Type：-
- Applications：-
- Input：-
- Output：-
- Data Rate (Max)：-
- Number of Channels：-
- Delay Time：-
- Signal Conditioning：-
- Voltage - Supply：-
- Current - Supply：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Capacitance - Input：-
- Grade：-
- Qualification：-
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Overview
The SN75178BD is a monolithic differential bus repeater designed for one-way data communication on multipoint transmission lines. It meets EIA Standards RS-422-A and RS-485, as well as CCITT Recommendations V.11 and X.27. The device features positive and negative current limiting with 3-state outputs. It operates from a single 5-V supply (4.75 V to 5.25 V) with a typical supply current of 57 mA. The driver provides up to 60 mA output current and includes thermal shutdown protection at approximately 150°C. The receiver has an input impedance of 12 kΩ minimum, sensitivity of ±200 mV, and hysteresis of 50 mV typical. Common-mode voltage range is –7 V to 12 V.
Feature Summary
- Designed for balanced transmission bus line applications in noisy environments
- Features positive and negative current limiting for robust operation
- Includes thermal shutdown protection against line fault conditions
Applications
- Multipoint transmission on long bus lines
- Balanced transmission bus line applications
- Bidirectional communication when paired with SN75177B
Procurement Notes
Verify the specific package suffix 'BD' against official documentation, as datasheets primarily reference 'BP' (PDIP) and 'DR' (SOIC). Confirm RoHS compliance status and lead finish details directly with Texas Instruments or authorized distributors before procurement.
Selection Notes
Select this component for one-way data communication on multipoint buses requiring high noise immunity. Ensure the application utilizes complementary enable inputs if bidirectional communication is required by pairing it with the SN75177B. Verify that the system operates within the specified 0°C to 70°C temperature range.
Part Context
The SN75178BD belongs to the SN75177B/SN75178B family of differential bus repeaters. These devices are identical except for their enable inputs, allowing them to be used in pairs for bidirectional communication. They are designed to improve data communication performance over long bus lines when used with other TI differential drivers and receivers.
Replacement Considerations
SN75177BD serves as the complementary counterpart for bidirectional designs. SN65LBC176A is a modern alternative offering similar functionality with improved specifications.
