SN65LBC170DBR Equivalent & Substitute Parts

Part Overview

The SN65LBC170DBR is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments, featuring 3 drivers and 3 receivers in a 16-SSOP surface mount package. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations. The obsolete status necessitates sourcing alternatives that maintain electrical and mechanical compatibility with existing applications.

Substiute Parts

SN65LBC170DBR

Texas InstrumentsIn Stock: 2291SN65LBC170DBR Datasheet

Current PartRFQ

SN65LBC170DW

Texas InstrumentsIn Stock: 2202SN65LBC170DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN65LBC170DBR are identified based on strict electrical and mechanical parameter matching. The primary substitution criterion is functional equivalence across the following parameters:

• Protocol support: RS422 and RS485 compatibility
• Driver/Receiver configuration: 3/3 topology
• Duplex operation: Half-duplex mode
• Data rate capability: 30 Mbps minimum
• Receiver hysteresis: 40 mV
• Supply voltage range: 4.75V ~ 5.25V
• Operating temperature range: -40°C ~ 85°C
• RoHS3 compliance and MSL rating

The SN65LBC170DW qualifies as a direct substitute based on matching all electrical parameters. The primary difference is the package type: 20-SOIC (0.295", 7.50mm Width) versus the original 16-SSOP package. This package variation requires PCB layout modification but maintains full electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN65LBC170DW serves as the primary substitute for the SN65LBC170DBR. Both components are obsolete products from Texas Instruments with identical electrical specifications and compliance certifications. Selection between these parts depends on PCB layout constraints:

Use SN65LBC170DBR when the original 16-SSOP footprint is already integrated into existing PCB designs and component availability permits.

Use SN65LBC170DW when PCB redesign is feasible or when the 20-SOIC package footprint is preferred. The larger package provides improved thermal characteristics and easier handling during assembly.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with standard manufacturing and storage conditions. The identical supply voltage range and operating temperature specifications eliminate the need for circuit redesign when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC170DW replace SN65LBC170DBR in existing designs?

A: Yes, electrically. The SN65LBC170DW provides identical electrical performance across all specified parameters. However, the package footprint differs (20-SOIC versus 16-SSOP), requiring PCB layout modification. Pin-to-pin functionality remains equivalent.

Q: What is the primary difference between these substitute parts?

A: The package type is the only difference. SN65LBC170DBR uses 16-SSOP packaging (0.209" width), while SN65LBC170DW uses 20-SOIC packaging (0.295" width). All electrical characteristics, including data rate, voltage range, and temperature specifications, are identical.

Q: Are both parts RoHS compliant?

A: Yes. Both SN65LBC170DBR and SN65LBC170DW are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity), meeting current environmental and regulatory requirements.

Q: What does the obsolete status mean for these components?

A: Both parts are classified as obsolete by Texas Instruments, indicating they are no longer in active production. Existing inventory remains available through authorized distributors, but long-term availability cannot be guaranteed. Planning for alternative solutions is recommended for new designs.

Q: Can these transceivers operate in both RS422 and RS485 modes?

A: Yes. Both the SN65LBC170DBR and SN65LBC170DW support both RS422 and RS485 protocols with half-duplex operation, 3 drivers, and 3 receivers. Circuit configuration determines the specific protocol implementation.

Q: What is the maximum data transmission rate?

A: Both parts support a maximum data rate of 30 Mbps across RS422 and RS485 networks.