SN75LBC173N Equivalent & Substitute Parts

Part Overview

The SN75LBC173N is a 0/4 Receiver IC for RS422, RS423, and RS485 serial communication protocols, manufactured by Texas Instruments in a 16-PDIP through-hole package. This part is classified as Obsolete, which necessitates identification of equivalent and substitute components for new designs or production continuity. The receiver hysteresis of 45 mV and supply voltage range of 4.75V to 5.25V define its operational characteristics for industrial and commercial serial communication applications.

Substiute Parts

SN75LBC173N

Texas InstrumentsIn Stock: 1970SN75LBC173N Datasheet

Current PartRFQ

SN65LBC173DR

Texas InstrumentsIn Stock: 7052SN65LBC173DR Datasheet

MFR RecommendedRFQ

SN75LBC175N

Texas InstrumentsIn Stock: 3781SN75LBC175N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN75LBC173N is determined by the following critical parameters:

• Protocol compatibility: RS422, RS423, RS485
• Receiver configuration: 0/4 (4 receivers, 0 drivers)
• Supply voltage range: 4.75V ~ 5.25V
• Receiver hysteresis: 40 mV minimum (45 mV preferred)
• RoHS3 compliance and REACH unaffected status

Two substitute categories are identified:

MFR Recommended Substitute (SN65LBC173DR): Functionally equivalent receiver with identical protocol support and driver/receiver count. Differs in mounting technology (surface mount vs. through hole) and operating temperature range expansion. Represents the active production alternative from the same manufacturer.

Parametric Equivalent (SN75LBC175N): Maintains identical package type, mounting method, and electrical specifications. Functionally equivalent within the same product line with matching receiver hysteresis and supply voltage parameters.

Parameter Comparison

Engineering Selection Recommendations

For through-hole PCB designs: The SN75LBC175N provides direct form-factor compatibility with identical electrical specifications and operating temperature range. Both the SN75LBC173N and SN75LBC175N are obsolete; however, the SN75LBC175N maintains parametric equivalence for legacy system maintenance.

For new designs or production continuity: The SN65LBC173DR is the manufacturer-recommended active substitute. It provides expanded operating temperature range (-40°C to 85°C) and specified data rate performance (50 Mbps). Surface-mount packaging requires PCB redesign but offers improved thermal characteristics and manufacturing efficiency. All three parts maintain ROHS3 compliance and REACH unaffected status.

For supply chain considerations: The SN65LBC173DR has higher inventory availability (6962 pcs) compared to the SN75LBC173N (1904 pcs) and SN75LBC175N (3700 pcs), supporting production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN65LBC173DR directly replace the SN75LBC173N on existing PCBs?

A: No. The SN65LBC173DR uses surface-mount 16-SOIC packaging versus the through-hole 16-DIP package of the SN75LBC173N. PCB redesign is required. The SN75LBC175N provides direct through-hole compatibility.

Q: What is the significance of the receiver hysteresis difference between SN75LBC173N (45 mV) and SN65LBC173DR (40 mV)?

A: Both values fall within acceptable RS422/RS423/RS485 receiver specifications. The 40 mV hysteresis of the SN65LBC173DR provides slightly tighter noise margin but remains functionally compatible for standard serial communication applications.

Q: Are all three parts RoHS compliant?

A: Yes. The SN75LBC173N, SN65LBC173DR, and SN75LBC175N are all ROHS3 compliant and REACH unaffected.

Q: Why is the SN65LBC173DR classified as the manufacturer-recommended substitute?

A: The SN65LBC173DR is the active production part from Texas Instruments with expanded operating temperature range and specified performance metrics. The SN75LBC173N and SN75LBC175N are obsolete, making the SN65LBC173DR the preferred long-term solution for new designs.

Q: What is the data rate specification for the SN75LBC173N?

A: The data rate is not specified in the product documentation. The SN65LBC173DR specifies 50 Mbps performance for reference.

Q: Can the SN75LBC175N be used as a direct replacement for the SN75LBC173N?

A: Yes, within the constraints of component availability. Both parts share identical package type, mounting method, receiver hysteresis (45 mV), and operating temperature range. However, both are obsolete products.