SN75LBC175DR Equivalent & Substitute Parts

Part Overview

The SN75LBC175DR is a 0/4 Receiver interface IC manufactured by Texas Instruments, designed for RS422, RS423, and RS485 serial communication protocols. This 16-SOIC surface mount component operates within a supply voltage range of 4.75V to 5.25V and maintains a receiver hysteresis of 45 mV across 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 flexibility for applications requiring RS422/RS423/RS485 receiver functionality.

Substiute Parts

SN75LBC175DR

Texas InstrumentsIn Stock: 2158SN75LBC175DR Datasheet

Current PartRFQ

SN65LBC175DR

Texas InstrumentsIn Stock: 12780SN65LBC175DR Datasheet

MFR RecommendedRFQ

DS34C86TM/NOPB

Texas InstrumentsIn Stock: 4013DS34C86TM/NOPB Datasheet

MFR RecommendedRFQ

DS34C86TMX/NOPB

Texas InstrumentsIn Stock: 10055DS34C86TMX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN75LBC175DR is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package type: 16-SOIC surface mount form factor
• Protocol support: RS422, RS423, RS485 receiver functionality
• Number of receivers: 0/4 configuration
• Mounting type: Surface mount
• RoHS compliance: ROHS3 Compliant

Secondary Compatibility Criteria:

• Receiver hysteresis: 45 mV (primary part specification)
• Supply voltage range: 4.75V ~ 5.25V (primary part specification)
• Operating temperature range: 0°C ~ 70°C (primary part specification)

The identified substitute parts maintain the core 16-SOIC package and receiver functionality. However, variations exist in receiver hysteresis, supply voltage tolerance, and operating temperature ranges. These variations must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

SN65LBC175DR is the primary recommended substitute for the SN75LBC175DR. Both parts share identical receiver hysteresis (45 mV) and supply voltage specifications (4.75V ~ 5.25V). The SN65LBC175DR maintains full protocol compatibility with RS422, RS423, and RS485 standards. The extended operating temperature range (-40°C ~ 85°C) provides broader environmental coverage compared to the main part. Product status is Active, ensuring continued availability and supply chain stability. RoHS3 compliance and MSL rating are equivalent.

DS34C86TM/NOPB and DS34C86TMX/NOPB are secondary substitutes with functional compatibility in RS422 and RS423 protocols. These parts feature increased receiver hysteresis (60 mV) and expanded supply voltage tolerance (4.5V ~ 5.5V). The extended operating temperature range (-40°C ~ 85°C) and Active product status support long-term design viability. RS485 protocol support is not specified for these alternatives. Selection of DS34C86 variants requires verification that the higher hysteresis specification and narrower protocol support align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC175DR directly replace SN75LBC175DR in existing designs?

A: Yes. Both parts maintain identical receiver hysteresis (45 mV), supply voltage range (4.75V ~ 5.25V), and protocol support (RS422, RS423, RS485). The 16-SOIC package and surface mount configuration are identical. The extended operating temperature range of SN65LBC175DR (-40°C ~ 85°C) provides additional environmental margin compared to the main part (0°C ~ 70°C).

Q: What are the key differences between SN75LBC175DR and DS34C86 variants?

A: The primary differences are receiver hysteresis and protocol support. SN75LBC175DR specifies 45 mV hysteresis and supports RS422, RS423, and RS485. DS34C86TM/NOPB and DS34C86TMX/NOPB specify 60 mV hysteresis and support only RS422 and RS423. Supply voltage tolerance is broader for DS34C86 variants (4.5V ~ 5.5V versus 4.75V ~ 5.25V). Operating temperature range is extended for DS34C86 variants (-40°C ~ 85°C).

Q: Are packaging differences significant between substitute options?

A: All substitute parts use the 16-SOIC (0.154", 3.90mm Width) package. Packaging format differs: SN75LBC175DR is supplied in Tape & Reel (TR), SN65LBC175DR in Cut Tape (CT) & Digi-Reel®, DS34C86TM/NOPB in Tube, and DS34C86TMX/NOPB in Cut Tape (CT) & Digi-Reel®. These format differences do not affect electrical or mechanical compatibility but may influence procurement and handling procedures.

Q: Which substitute part offers the best long-term availability?

A: SN65LBC175DR is recommended for long-term design continuity. It maintains Active product status, identical electrical specifications to the main part, and equivalent RoHS3 compliance. DS34C86 variants also maintain Active status but with protocol and hysteresis specification differences that require application verification.

Q: Is receiver hysteresis difference between 45 mV and 60 mV significant?

A: Receiver hysteresis affects noise immunity and signal transition characteristics. The 45 mV specification of SN75LBC175DR and SN65LBC175DR provides tighter hysteresis control compared to the 60 mV specification of DS34C86 variants. Applications with marginal signal quality or high-noise environments may require the lower hysteresis specification. Designs with robust signal conditioning can tolerate the higher hysteresis of DS34C86 alternatives.