SN75LBC175D Equivalent & Substitute Parts

Part Overview

The SN75LBC175D is a 0/4 Receiver interface IC manufactured by Texas Instruments, designed for RS422, RS423, and RS485 serial communication protocols. It is packaged in a 16-SOIC surface mount configuration with a receiver hysteresis of 45 mV and operates within a supply voltage range of 4.75V to 5.25V across a temperature range of 0°C to 70°C. The part is currently in Last Time Buy status with 2400 units in stock. Due to its Last Time Buy designation, identifying equivalent and substitute parts is necessary for long-term design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75LBC175D
Manufacturer	Texas Instruments
Category	Interface
Type	Receiver
Protocol	RS422, RS423, RS485
Number of Drivers/Receivers	0/4
Receiver Hysteresis	45 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the SN75LBC175D is determined by the following critical parameters:

Primary Substitution Criteria:

Protocol support (RS422, RS423, RS485 compatibility)
Number of drivers/receivers (0/4 configuration)
Package type (16-SOIC form factor)
Receiver hysteresis (45 mV nominal)
Supply voltage range (4.75V ~ 5.25V minimum overlap)
Operating temperature range (0°C ~ 70°C minimum coverage)
RoHS3 compliance

Substitution Categories:

MFR Recommended Substitutes – Parts with active product status and full protocol support:

SN65LBC175DR: Extended temperature range (-40°C ~ 85°C), identical electrical specifications, Cut Tape packaging
DS34C86TM/NOPB and DS34C86TMX/NOPB: RS422/RS423 protocol support, 60 mV hysteresis, extended temperature range, active status

Parametric Equivalent – Part with identical electrical specifications but Last Time Buy status:

SN75LBC173D: Identical receiver hysteresis (45 mV), voltage range, and temperature specifications; differs in protocol support (RS422, RS423, RS485)

Extended Compatibility Substitutes – Parts with protocol overlap and compatible electrical parameters:

LTC489CSW#PBF and LTC489CSW#TRPBF: Analog Devices manufacturer, RS422/RS485 support, 60 mV hysteresis, wider package dimensions (0.295" vs 0.154"), active status

Parameter Comparison

Parameter	SN75LBC175D	SN65LBC175DR	DS34C86TM/NOPB	DS34C86TMX/NOPB	SN75LBC173D	LTC489CSW#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc.
Protocol	RS422, RS423, RS485	RS422, RS423, RS485	RS422, RS423	RS422, RS423	RS422, RS423, RS485	RS422, RS485
Number of Drivers/Receivers	0/4	0/4	0/4	0/4	0/4	0/4
Receiver Hysteresis	45 mV	45 mV	60 mV	60 mV	45 mV	60 mV
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Active	Active	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility): SN65LBC175DR is the primary recommended substitute. It maintains identical electrical specifications (45 mV hysteresis, 4.75V ~ 5.25V supply voltage) and full protocol support (RS422, RS423, RS485). The extended operating temperature range (-40°C ~ 85°C) provides broader environmental coverage. Active product status ensures long-term availability. Cut Tape and Digi-Reel packaging options support both prototype and production volumes.

For Extended Temperature Applications: DS34C86TM/NOPB and DS34C86TMX/NOPB offer extended temperature operation (-40°C ~ 85°C) with wider supply voltage tolerance (4.5V ~ 5.5V). These parts support RS422 and RS423 protocols with 60 mV receiver hysteresis. Active status guarantees continued supply. Note that RS485 protocol support is not specified for these alternatives.

For Parametric Equivalence: SN75LBC173D provides identical electrical specifications and temperature range as the SN75LBC175D. Both are Last Time Buy parts with 45 mV hysteresis and 0°C ~ 70°C operation. This option is suitable only when existing inventory must be maintained or when protocol differences do not impact system requirements.

For Cross-Manufacturer Compatibility: LTC489CSW#TRPBF (Analog Devices) supports RS422 and RS485 protocols with 60 mV hysteresis and active product status. The wider package dimensions (0.295" vs 0.154" width) require PCB layout verification. This option is applicable when multi-source qualification is required.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC175DR be used as a direct drop-in replacement for SN75LBC175D? A: Yes. Both parts share identical receiver hysteresis (45 mV), supply voltage range (4.75V ~ 5.25V), package type (16-SOIC 0.154" width), and full protocol support (RS422, RS423, RS485). The extended temperature range of SN65LBC175DR (-40°C ~ 85°C vs 0°C ~ 70°C) provides additional operational margin. No circuit modifications are required.

Q: What is the difference between 45 mV and 60 mV receiver hysteresis? A: Receiver hysteresis determines the voltage differential required to switch the output state. The 45 mV specification of SN75LBC175D and SN65LBC175DR provides tighter switching thresholds compared to the 60 mV hysteresis of DS34C86 variants. For applications with marginal signal levels, the 45 mV hysteresis may provide improved noise immunity. The 60 mV hysteresis is acceptable for standard RS422/RS423/RS485 implementations.

Q: Why do DS34C86TM/NOPB and DS34C86TMX/NOPB not support RS485? A: The DS34C86 series is specified for RS422 and RS423 protocols only. RS485 support requires additional electrical characteristics not present in this device family. If RS485 protocol is required, SN65LBC175DR or LTC489CSW#TRPBF are appropriate alternatives.

Q: Can LTC489CSW#TRPBF be used in place of SN75LBC175D despite the different package width? A: LTC489CSW#TRPBF has a wider package footprint (0.295" vs 0.154" width). While electrical specifications are compatible, PCB layout modifications are necessary. The part supports RS422 and RS485 but not RS423. This substitution requires design review and board layout changes.

Q: What is the significance of "Last Time Buy" status? A: Last Time Buy indicates that the manufacturer will discontinue production after a specified date. SN75LBC175D and SN75LBC173D are both in Last Time Buy status. For new designs or long-term production, active-status alternatives such as SN65LBC175DR, DS34C86 variants, or LTC489CSW#TRPBF should be selected to ensure supply continuity.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All parts listed in this reference—SN75LBC175D, SN65LBC175DR, DS34C86TM/NOPB, DS34C86TMX/NOPB, SN75LBC173D, LTC489CSW#PBF, and LTC489CSW#TRPBF—are ROHS3 compliant and REACH unaffected.

Q: What packaging options are available for each substitute? A: SN65LBC175DR is available in Cut Tape (CT) and Digi-Reel packaging. DS34C86TM/NOPB is supplied in Tube packaging, while DS34C86TMX/NOPB is available in Cut Tape and Digi-Reel. LTC489CSW#PBF is supplied in Tube, and LTC489CSW#TRPBF is available in Tape & Reel (TR) format. Packaging selection depends on production volume and assembly requirements.

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