SN75ALS180N Equivalent & Substitute Parts

Part Overview

The SN75ALS180N is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Texas Instruments in a 14-DIP through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The SN75ALS180N operates within a 4.75V to 5.25V supply voltage range with a 60 mV receiver hysteresis specification, designed for industrial serial communication applications requiring reliable data transmission over extended distances.

Substiute Parts

SN75ALS180N

Texas InstrumentsIn Stock: 4319SN75ALS180N Datasheet

Current PartRFQ

SN65ALS180DR

Texas InstrumentsIn Stock: 100248SN65ALS180DR Datasheet

MFR RecommendedRFQ

SN75ALS181N

Texas InstrumentsIn Stock: 2189SN75ALS181N Datasheet

Parametric EquivalentRFQ

MAX3491CPD+

Analog Devices Inc./Maxim IntegratedIn Stock: 1008MAX3491CPD+ Datasheet

MFR RecommendedRFQ

MAX3491EPD+

Analog Devices Inc./Maxim IntegratedIn Stock: 3285MAX3491EPD+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN75ALS180N is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Protocol compatibility: RS422/RS485 full-duplex operation
• Driver/Receiver configuration: 1/1 topology
• Supply voltage range: 4.75V ~ 5.25V (primary criterion)
• Receiver hysteresis: 60 mV (functional equivalence)
• Package type: 14-DIP through-hole (pin-compatible)
• Duplex mode: Full-duplex operation

Substitution Categories:

Category 1 - Parametric Equivalent (Same Package, Same Electrical Specs): SN75ALS181N maintains identical electrical parameters and 14-DIP packaging, differing only in base product designation. This part is a direct parametric equivalent suitable for direct replacement in existing designs.

Category 2 - MFR Recommended (Different Package, Enhanced Specs): SN65ALS180DR is the surface-mount equivalent offering the same core functionality in 14-SOIC packaging. This substitution requires PCB redesign but provides active product status and extended operating temperature range (-40°C ~ 85°C).

Category 3 - MFR Recommended (Enhanced Supply Voltage, Active Status): MAX3491CPD+ and MAX3491EPD+ are Analog Devices/Maxim Integrated alternatives with reduced supply voltage range (3V ~ 3.6V), 50 mV receiver hysteresis, and 10 Mbps data rate specification. These parts maintain 14-DIP through-hole packaging and active product status. The voltage specification difference requires circuit evaluation before substitution.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes): SN75ALS181N is the preferred substitute when maintaining existing PCB layouts and through-hole assembly processes. Both parts share identical electrical specifications, 14-DIP packaging, and ROHS3 compliance. The SN75ALS181N maintains the same 4.75V ~ 5.25V supply voltage requirement and 60 mV receiver hysteresis, ensuring functional equivalence without circuit modification.

For Active Product Status with Surface Mount Capability: SN65ALS180DR provides active product status and extended operating temperature range (-40°C ~ 85°C) while maintaining identical electrical parameters. This substitution requires PCB redesign to accommodate 14-SOIC surface-mount packaging but eliminates obsolescence risk for long-term production.

For Low-Voltage Applications with Active Status: MAX3491CPD+ and MAX3491EPD+ are suitable only when the application circuit operates within the 3V ~ 3.6V supply voltage range. These parts provide active product status and specified 10 Mbps data rate. MAX3491EPD+ extends the operating temperature range to -40°C ~ 85°C, providing superior environmental performance. The reduced receiver hysteresis (50 mV versus 60 mV) may require signal integrity evaluation in noise-sensitive applications.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original SN75ALS180N certification profile.

Frequently Asked Questions (FAQ)

Q: Can SN75ALS181N be used as a direct replacement for SN75ALS180N? A: Yes. SN75ALS181N is a parametric equivalent with identical electrical specifications (4.75V ~ 5.25V supply, 60 mV receiver hysteresis, 0°C ~ 70°C operating temperature) and 14-DIP through-hole packaging. No circuit modifications are required.

Q: What is the primary difference between SN65ALS180DR and SN75ALS180N? A: SN65ALS180DR differs in mounting type (surface mount 14-SOIC versus through-hole 14-DIP) and product status (active versus obsolete). Electrical parameters remain identical. PCB redesign is necessary for this substitution.

Q: Can MAX3491CPD+ replace SN75ALS180N in existing designs? A: MAX3491CPD+ requires circuit evaluation before substitution. The supply voltage range differs (3V ~ 3.6V versus 4.75V ~ 5.25V), necessitating power supply compatibility verification. The 14-DIP through-hole package is pin-compatible, but the reduced receiver hysteresis (50 mV) may affect signal integrity in specific applications.

Q: What is the difference between MAX3491CPD+ and MAX3491EPD+? A: Both parts share identical electrical specifications and 14-DIP packaging. MAX3491EPD+ extends the operating temperature range to -40°C ~ 85°C, compared to MAX3491CPD+ at 0°C ~ 70°C. Select MAX3491EPD+ for applications requiring extended temperature performance.

Q: Why is SN75ALS180N classified as obsolete? A: Obsolete status indicates the manufacturer has discontinued production. SN75ALS181N, SN65ALS180DR, and MAX3491 series parts provide active alternatives for new designs and ongoing production requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. SN75ALS181N, SN65ALS180DR, MAX3491CPD+, and MAX3491EPD+ are all ROHS3 compliant, matching the original SN75ALS180N certification.

Q: Which substitute part offers the widest operating temperature range? A: SN65ALS180DR, MAX3491EPD+ both provide -40°C ~ 85°C operating temperature range, compared to 0°C ~ 70°C for SN75ALS180N and SN75ALS181N.