SN65LBC180N Equivalent & Substitute Parts

Part Overview

The SN65LBC180N is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Texas Instruments, housed in a 14-pin DIP package for through-hole mounting. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The SN65LBC180N maintains full electrical compatibility with active alternatives while offering the same core transceiver functionality for industrial communication applications.

Substiute Parts

SN65LBC180N

Texas InstrumentsIn Stock: 866SN65LBC180N Datasheet

Current PartRFQ

SN65LBC180DR

Texas InstrumentsIn Stock: 12817SN65LBC180DR Datasheet

MFR RecommendedRFQ

LTC491CN#PBF

Analog Devices Inc.In Stock: 2255LTC491CN#PBF Datasheet

MFR RecommendedRFQ

LTC491IN#PBF

Analog Devices Inc.In Stock: 2226LTC491IN#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN65LBC180N is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Protocol compatibility: RS422/RS485 full-duplex transceiver
• Driver/Receiver configuration: 1/1
• Supply voltage range: 4.75V ~ 5.25V
• Operating temperature range: -40°C ~ 85°C (minimum requirement)
• Package type: 14-DIP through-hole mounting

Acceptable Variations:

• Receiver hysteresis may differ (45 mV vs. 70 mV) without affecting functional compatibility
• Product status transition from obsolete to active is acceptable
• RoHS3 compliance is maintained across all substitutes

The substitute parts are grouped into two categories based on mounting type: surface-mount alternatives (SN65LBC180DR) and through-hole alternatives (LTC491CN#PBF, LTC491IN#PBF).

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole Designs (Direct Package Replacement):

LTC491IN#PBF is the preferred through-hole substitute. It maintains identical package dimensions (14-DIP), mounting type, and operating temperature range (-40°C ~ 85°C) as the SN65LBC180N. The part is active and ROHS3 compliant. The 70 mV receiver hysteresis specification does not affect functional compatibility with the original 45 mV design.

LTC491CN#PBF is an alternative through-hole option with the same package and mounting characteristics. However, its operating temperature range (0°C ~ 70°C) is narrower than the original specification and may not be suitable for applications requiring the full -40°C ~ 85°C range.

For Surface-Mount Designs (Functional Equivalent):

SN65LBC180DR provides a functionally equivalent substitute with identical electrical specifications and the same Texas Instruments manufacturer lineage. The 14-SOIC surface-mount package requires PCB layout modification but maintains all core transceiver parameters. This option is active and ROHS3 compliant.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can LTC491CN#PBF be used in applications requiring -40°C operation?

A: No. LTC491CN#PBF has an operating temperature range of 0°C ~ 70°C, which does not meet the -40°C minimum requirement of the original SN65LBC180N. Use LTC491IN#PBF for full temperature range compatibility.

Q: What is the difference between LTC491CN#PBF and LTC491IN#PBF?

A: Both parts are Analog Devices LTC491 transceivers in 14-DIP packages. The primary difference is operating temperature range: LTC491CN#PBF operates 0°C ~ 70°C, while LTC491IN#PBF operates -40°C ~ 85°C, matching the original SN65LBC180N specification.

Q: Can SN65LBC180DR replace SN65LBC180N in existing through-hole designs?

A: SN65LBC180DR is electrically equivalent but requires PCB redesign due to its 14-SOIC surface-mount package versus the 14-DIP through-hole package of the original. For direct board-level replacement without layout changes, use LTC491IN#PBF or LTC491CN#PBF.

Q: Are there differences in receiver hysteresis between the original and substitutes?

A: Yes. SN65LBC180N and SN65LBC180DR specify 45 mV receiver hysteresis, while LTC491CN#PBF and LTC491IN#PBF specify 70 mV. Both values are within acceptable RS422/RS485 transceiver specifications and do not affect functional compatibility.

Q: What is the inventory status of these substitutes?

A: SN65LBC180DR has 12,800 units in stock. LTC491CN#PBF and LTC491IN#PBF each have 2,200 units in stock. The original SN65LBC180N has 776 units available as new original stock.