SN75LBC173D Equivalent & Substitute Parts

Part Overview

The SN75LBC173D is a 0/4 Receiver interface IC manufactured by Texas Instruments, designed for RS422, RS423, and RS485 serial communication protocols. This device operates in the 16-SOIC package with a supply voltage range of 4.75V to 5.25V and an operating temperature range of 0°C to 70°C. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring RS422/RS423/RS485 receiver functionality.

Substiute Parts

SN75LBC173D

Texas InstrumentsIn Stock: 2300SN75LBC173D Datasheet

Current PartRFQ

SN65LBC173DR

Texas InstrumentsIn Stock: 7052SN65LBC173DR Datasheet

MFR RecommendedRFQ

SN75LBC175D

Texas InstrumentsIn Stock: 2441SN75LBC175D Datasheet

Parametric EquivalentRFQ

LTC488CSW#PBF

Analog Devices Inc.In Stock: 2061LTC488CSW#PBF Datasheet

MFR RecommendedRFQ

LTC488CSW#TRPBF

Analog Devices Inc.In Stock: 1991LTC488CSW#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN75LBC173D is determined by the following critical parameters:

• Protocol compatibility: RS422, RS423, RS485 support
• Receiver configuration: 0/4 (zero drivers, four receivers)
• Supply voltage range: 4.75V to 5.25V
• Package type: 16-SOIC form factor
• Receiver hysteresis: 45 mV nominal
• Operating temperature range: 0°C to 70°C minimum

Substitute parts are grouped into two categories:

MFR Recommended Substitutes maintain identical or superior electrical specifications and active product status, ensuring long-term availability and design compatibility.

Parametric Equivalents provide functional compatibility with matching receiver configuration and protocol support, though they may have different product lifecycle status or packaging options.

Parameter Comparison

Engineering Selection Recommendations

SN65LBC173DR is the primary recommended substitute. This Texas Instruments part maintains the same base receiver architecture (0/4 configuration) and protocol support (RS422, RS423, RS485) with identical supply voltage specifications. The SN65LBC173DR offers an extended operating temperature range (-40°C to 85°C) compared to the original part, providing superior thermal performance. This part carries Active product status, ensuring continued availability and long-term supply chain stability. The receiver hysteresis specification of 40 mV is within acceptable tolerance for RS422/RS485 applications. Packaging is Tape & Reel (TR), suitable for high-volume production environments.

SN75LBC175D provides parametric equivalence with matching receiver hysteresis (45 mV) and identical operating temperature range (0°C to 70°C). Both parts share the same base receiver configuration and protocol support. However, this part also carries Last Time Buy status, offering no supply chain advantage over the original SN75LBC173D.

LTC488CSW#PBF and LTC488CSW#TRPBF (Analog Devices Inc.) are functionally compatible alternatives supporting RS422 and RS485 protocols with 0/4 receiver configuration. These parts feature Active product status and identical supply voltage specifications. The receiver hysteresis of 60 mV is higher than the original specification but remains within acceptable operating margins for RS422/RS485 systems. Package dimensions differ (0.295" width versus 0.154" width), requiring PCB layout verification before implementation. The Tape & Reel variant (LTC488CSW#TRPBF) is preferred for production environments.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC173DR be used as a direct replacement for SN75LBC173D?

A: Yes. Both parts share identical receiver configuration (0/4), protocol support (RS422, RS423, RS485), supply voltage range (4.75V to 5.25V), and package form factor (16-SOIC, 0.154" width). The SN65LBC173DR offers extended operating temperature range (-40°C to 85°C) and Active product status, making it the preferred long-term substitute.

Q: What is the significance of receiver hysteresis differences?

A: Receiver hysteresis determines the voltage differential required to switch output states, affecting noise immunity. The SN75LBC173D specifies 45 mV hysteresis. The SN65LBC173DR (40 mV) and LTC488 variants (60 mV) all operate within standard RS422/RS485 receiver specifications. Higher hysteresis (60 mV) provides increased noise immunity in electrically noisy environments; lower hysteresis (40 mV) may improve signal detection speed in clean environments.

Q: Are the Analog Devices LTC488 parts pin-compatible?

A: The LTC488CSW#PBF and LTC488CSW#TRPBF maintain the same 16-pin SOIC package configuration and pinout as the SN75LBC173D. However, the physical package width differs (0.295" versus 0.154"), requiring PCB footprint verification before board redesign.

Q: Why is SN75LBC175D listed as a substitute if it has Last Time Buy status?

A: SN75LBC175D provides parametric equivalence with identical receiver hysteresis (45 mV) and operating temperature range (0°C to 70°C). It is included for reference in applications where this specific hysteresis value is critical. However, for new designs, SN65LBC173DR is recommended due to its Active product status.

Q: What are the packaging implications for production?

A: SN75LBC173D and SN65LBC173DR are available in Tube and Tape & Reel (TR) packaging respectively. For high-volume production, Tape & Reel packaging (SN65LBC173DR or LTC488CSW#TRPBF) is standard. Tube packaging is suitable for lower-volume or prototype applications. Verify your assembly equipment compatibility with the selected packaging format.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SN65LBC173DR, SN75LBC175D, LTC488CSW#PBF, and LTC488CSW#TRPBF) carry ROHS3 Compliant certification, matching the original SN75LBC173D specification.