SN65LBC175D Equivalent & Substitute Parts

Part Overview

The SN65LBC175D is a 0/4 Receiver interface IC manufactured by Texas Instruments, designed for RS422, RS423, and RS485 serial communication protocols. This device operates at 4.75V to 5.25V supply voltage with an operating temperature range of -40°C to 85°C, housed in a 16-SOIC surface mount package. The SN65LBC175D is classified as Last Time Buy, indicating limited availability. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65LBC175D
Manufacturer	Texas Instruments
Category	Interface
Type	Receiver
Protocol	RS422, RS423, RS485
Number of Drivers/Receivers	0/4
Receiver Hysteresis	40 mV
Data Rate	50 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN65LBC175D is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Protocol support: RS422, RS423, RS485
Number of Drivers/Receivers: 0/4 configuration
Voltage supply range: 4.75V ~ 5.25V
Operating temperature range: -40°C ~ 85°C
Package type: 16-SOIC surface mount
Receiver hysteresis: 40 mV (preferred) or 45 mV (acceptable variance)
Data rate: 50 Mbps (preferred) or unspecified (acceptable)

Substitution Groups:

Group 1: Texas Instruments Direct Equivalents

SN65LBC175DR: Identical electrical specifications with different packaging (Cut Tape & Digi-Reel)
SN65LBC175AD: Identical electrical specifications, Tube packaging
SN65LBC173D: Parametric equivalent with identical core specifications

Group 2: Analog Devices Cross-Manufacturer Equivalents

LTC489ISW#TRPBF: Supports RS422/RS485 (RS423 not specified), 0/4 configuration, identical voltage and temperature range, 60 mV hysteresis
LTC489ISW#PBF: Identical to LTC489ISW#TRPBF with different packaging
LTC489CSW#TRPBF: Identical to LTC489ISW#TRPBF with commercial temperature range (0°C ~ 70°C)
LTC489CSW#PBF: Identical to LTC489CSW#TRPBF with different packaging

Parameter Comparison

Part Number	Manufacturer	Protocol	Receivers	Hysteresis	Data Rate	Voltage Supply	Temp Range	Package	Product Status
SN65LBC175D	Texas Instruments	RS422, RS423, RS485	0/4	40 mV	50 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	16-SOIC (0.154")	Last Time Buy
SN65LBC175DR	Texas Instruments	RS422, RS423, RS485	0/4	45 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	16-SOIC (0.154")	Active
SN65LBC175AD	Texas Instruments	RS422, RS423, RS485	0/4	40 mV	50 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	16-SOIC (0.154")	Last Time Buy
SN65LBC173D	Texas Instruments	RS422, RS423, RS485	0/4	40 mV	50 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	16-SOIC (0.154")	Last Time Buy
LTC489ISW#TRPBF	Analog Devices Inc.	RS422, RS485	0/4	60 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	16-SOIC (0.295")	Active
LTC489ISW#PBF	Analog Devices Inc.	RS422, RS485	0/4	60 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	16-SOIC (0.295")	Active
LTC489CSW#TRPBF	Analog Devices Inc.	RS422, RS485	0/4	60 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	16-SOIC (0.295")	Active
LTC489CSW#PBF	Analog Devices Inc.	RS422, RS485	0/4	60 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	16-SOIC (0.295")	Active

Engineering Selection Recommendations

Tier 1 - Preferred Substitutes (Texas Instruments): SN65LBC175DR, SN65LBC175AD, and SN65LBC173D are preferred substitutes due to identical manufacturer lineage, matching electrical specifications, and Active or Last Time Buy product status. These parts maintain full protocol support (RS422, RS423, RS485) and identical operating temperature range (-40°C ~ 85°C). SN65LBC175DR is recommended as the primary choice due to Active product status and higher inventory availability (12,700 units).

Tier 2 - Cross-Manufacturer Substitutes (Analog Devices): LTC489ISW#TRPBF and LTC489ISW#PBF are suitable for applications requiring extended temperature range (-40°C ~ 85°C) and Active product status. These parts support RS422 and RS485 protocols but do not include RS423 support. The 60 mV receiver hysteresis differs from the original 40 mV specification. Package width is 0.295" (7.50mm) compared to 0.154" (3.90mm) for the SN65LBC175D, requiring PCB layout verification.

Tier 3 - Limited Substitutes (Analog Devices Commercial Temperature): LTC489CSW#TRPBF and LTC489CSW#PBF are suitable only for applications with operating temperature requirements of 0°C ~ 70°C. These parts are not recommended for designs requiring the full -40°C ~ 85°C temperature range of the original SN65LBC175D.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC175DR directly replace SN65LBC175D without design changes? A: SN65LBC175DR is electrically compatible with identical voltage supply, operating temperature range, and package footprint. The receiver hysteresis increases from 40 mV to 45 mV, which is within acceptable tolerance for RS422/RS485 applications. No PCB layout changes are required.

Q: What is the key difference between SN65LBC175AD and SN65LBC175D? A: Both parts are parametrically identical. The difference is packaging: SN65LBC175D is supplied in Tube packaging, while SN65LBC175AD is also supplied in Tube packaging. Both are Last Time Buy status. Selection depends on inventory availability and supply chain requirements.

Q: Why do Analog Devices LTC489 parts have different package dimensions? A: The LTC489 series uses a 16-SOIC package with 0.295" (7.50mm) width, compared to the Texas Instruments 16-SOIC with 0.154" (3.90mm) width. These are different SOIC variants. PCB footprint verification is required before substitution.

Q: Can LTC489CSW#TRPBF be used in a -40°C application? A: No. LTC489CSW#TRPBF is rated for 0°C ~ 70°C operating temperature and is not suitable for applications requiring -40°C operation. Use LTC489ISW#TRPBF instead, which supports -40°C ~ 85°C.

Q: Does LTC489ISW#TRPBF support RS423 protocol? A: No. LTC489ISW#TRPBF supports RS422 and RS485 protocols only. RS423 support is not specified. If RS423 protocol is required, use Texas Instruments SN65LBC175 series parts (SN65LBC175D, SN65LBC175DR, or SN65LBC175AD).

Q: What is the inventory status of substitute parts? A: SN65LBC175DR has the highest availability (12,700 units). SN65LBC173D has 2,410 units. SN65LBC175AD has 2,150 units. LTC489ISW#TRPBF has 2,000 units. LTC489CSW#TRPBF has 6,432 units. All substitute parts are in stock as New Original.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SN65LBC175D specifications.

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