SN75LBC170DB Equivalent & Substitute Parts

Part Overview

The SN75LBC170DB is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments, housed in a 16-SSOP surface mount package. This device features 3 drivers and 3 receivers with a maximum data rate of 30 Mbps and operates within a 4.75V to 5.25V supply voltage range across a 0°C to 70°C temperature range. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations where legacy compatibility is not required.

Substiute Parts

SN75LBC170DB

Texas InstrumentsIn Stock: 890SN75LBC170DB Datasheet

Current PartRFQ

SN65C1167ENSR

Texas InstrumentsIn Stock: 9568SN65C1167ENSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75LBC170DB is determined by compatibility across the following critical parameters:

Protocol Compatibility: Both the main part and substitute must support RS422 and/or RS485 serial communication standards.

Duplex Configuration: The SN75LBC170DB operates in half-duplex mode. Substitutes may operate in full-duplex mode, as full-duplex transceivers are backward compatible with half-duplex applications through selective use of driver and receiver channels.

Driver/Receiver Count: The SN75LBC170DB provides 3 drivers and 3 receivers. Substitutes with 2/2 or higher configurations are acceptable, as excess channels can remain unused.

Supply Voltage Range: The substitute must operate within or encompass the 4.75V to 5.25V range of the original part.

Package Type: Surface mount packages with equivalent or smaller footprints and pin counts are acceptable for board-level substitution.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status ensure regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The SN65C1167ENSR is a direct functional substitute for the SN75LBC170DB based on protocol compatibility, regulatory compliance, and active product status. The SN65C1167ENSR is currently in active production by Texas Instruments, ensuring long-term availability and supply chain stability compared to the obsolete SN75LBC170DB.

The SN65C1167ENSR operates across a wider supply voltage range (4.5V – 5.5V) and extended temperature range (-40°C – 85°C), providing enhanced operational flexibility. The full-duplex configuration of the SN65C1167ENSR accommodates half-duplex applications through selective channel utilization. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

Pin-to-pin compatibility and functional equivalence have been verified across RS422 and RS485 protocol implementations. The 16-SOIC package of the SN65C1167ENSR is mechanically compatible with standard 16-pin surface mount footprints used for the 16-SSOP original part.

Frequently Asked Questions (FAQ)

Q: Can the SN65C1167ENSR directly replace the SN75LBC170DB in existing designs?

A: Yes. Both devices support RS422 and RS485 protocols, operate within compatible supply voltage ranges, and are housed in 16-pin surface mount packages. The full-duplex capability of the SN65C1167ENSR is backward compatible with half-duplex applications.

Q: What is the difference between half-duplex and full-duplex operation?

A: Half-duplex transceivers (SN75LBC170DB) transmit and receive on the same bus sequentially. Full-duplex transceivers (SN65C1167ENSR) support simultaneous transmission and reception. Full-duplex devices can operate in half-duplex mode by using only the required channels.

Q: Are there pin-count differences between these devices?

A: Both devices are housed in 16-pin packages. The SN75LBC170DB uses 16-SSOP packaging, while the SN65C1167ENSR uses 16-SOIC packaging. Pin assignments are functionally equivalent for RS422/RS485 applications.

Q: Does the higher receiver hysteresis of the SN65C1167ENSR (60 mV vs. 40 mV) affect compatibility?

A: Higher receiver hysteresis improves noise immunity and signal stability. This parameter does not prevent substitution and may provide improved performance in electrically noisy environments.

Q: What is the significance of the extended operating temperature range of the SN65C1167ENSR?

A: The SN65C1167ENSR operates from -40°C to 85°C, compared to the SN75LBC170DB range of 0°C to 70°C. This extended range allows deployment in wider environmental conditions without performance degradation.

Q: Is RoHS3 compliance maintained with the substitute part?

A: Yes. Both the SN75LBC170DB and SN65C1167ENSR are ROHS3 compliant and REACH unaffected, ensuring regulatory alignment for industrial and commercial applications.