SN75LBC174ADWR Equivalent & Substitute Parts

Part Overview

The SN75LBC174ADWR is a 4/0 Driver RS422/RS485 interface IC manufactured by Texas Instruments in a 20-SOIC surface mount package. This component is classified as obsolete, indicating it has been discontinued and is no longer in active production. Due to its obsolete status, locating original inventory becomes increasingly difficult. Identifying qualified substitute parts ensures design continuity and maintains supply chain reliability for applications requiring RS422/RS485 driver functionality.

Substiute Parts

SN75LBC174ADWR

Texas InstrumentsIn Stock: 1676SN75LBC174ADWR Datasheet

Current PartRFQ

SN65LBC174ADWR

Texas InstrumentsIn Stock: 2206SN65LBC174ADWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75LBC174ADWR is determined by strict equivalence across the following critical parameters:

• Protocol Compatibility: Both main and substitute parts must support RS422/RS485 communication standards
• Driver/Receiver Configuration: 4/0 driver configuration must be maintained
• Data Rate: 30 Mbps operational capability required
• Supply Voltage Range: 4.75V ~ 5.25V compatibility mandatory
• Package Type: 20-SOIC surface mount package with identical physical dimensions (0.295", 7.50mm Width)
• Electrical Compliance: ROHS3 compliance and MSL Level 1 rating required

The SN65LBC174ADWR qualifies as a direct substitute based on full alignment with these parameters. The primary distinction is product status: the SN65LBC174ADWR is active production, whereas the SN75LBC174ADWR is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The SN65LBC174ADWR is the qualified substitute for the obsolete SN75LBC174ADWR. Both components maintain identical electrical specifications, package geometry, and compliance certifications. The SN65LBC174ADWR offers the advantage of active production status, ensuring long-term availability and supply chain stability.

The SN65LBC174ADWR provides an extended operating temperature range (-40°C ~ 85°C) compared to the original part (0°C ~ 70°C), which represents an enhancement for applications requiring broader thermal operation. This extended range does not compromise compatibility with designs originally specified for the SN75LBC174ADWR.

Both parts carry ROHS3 compliance and MSL Level 1 rating, confirming equivalent environmental and handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN65LBC174ADWR directly replace the SN75LBC174ADWR without PCB modifications?

A: Yes. Both parts use the 20-SOIC package with identical pin configuration and physical dimensions. No PCB layout changes are required.

Q: Are the electrical specifications identical between these parts?

A: The core electrical specifications are equivalent: 4/0 driver configuration, RS422/RS485 protocol support, 30 Mbps data rate, and 4.75V ~ 5.25V supply voltage. The SN65LBC174ADWR includes a specified receiver hysteresis of 40 mV and operates across a wider temperature range.

Q: Why is the operating temperature range different?

A: The SN65LBC174ADWR (-40°C ~ 85°C) supports extended thermal operation compared to the SN75LBC174ADWR (0°C ~ 70°C). This difference reflects design improvements in the active production variant and does not affect compatibility with existing designs.

Q: What is the significance of the product status change from Obsolete to Active?

A: Active production status ensures continued availability, established supply chains, and manufacturer support. The SN65LBC174ADWR will remain available for future procurement, whereas the SN75LBC174ADWR inventory is finite and non-replenishable.

Q: Are compliance certifications maintained in the substitute part?

A: Yes. Both parts carry identical ROHS3 compliance and MSL Level 1 ratings, confirming equivalent environmental and handling standards.