SN75ALS181N RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The SN75ALS181N is a full-duplex RS422/RS485 transceiver manufactured by Texas Instruments in a 14-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The SN75ALS181N operates at 4.75V to 5.25V supply voltage with a receiver hysteresis of 60 mV and supports full-duplex communication protocols. Identifying compatible substitutes ensures design continuity and supply chain flexibility.

Substiute Parts

SN75ALS181N

Texas InstrumentsIn Stock: 2189SN75ALS181N Datasheet

Current PartRFQ

LTC491CN#PBF

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

MFR RecommendedRFQ

LTC491IN#PBF

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

MFR RecommendedRFQ

MAX3491CPD+

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

MFR RecommendedRFQ

MAX3491EPD+

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

MFR RecommendedRFQ

SN75ALS180N

Texas InstrumentsIn Stock: 4319SN75ALS180N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN75ALS181N is determined by strict alignment of the following parameters:

Critical Parameters for Substitution:

• Protocol support (RS422, RS485)
• Duplex configuration (Full)
• Driver/Receiver count (1/1)
• Package type (14-DIP)
• Mounting type (Through Hole)
• Supply voltage compatibility (4.75V ~ 5.25V or wider range)
• Operating temperature range (must meet or exceed 0°C ~ 70°C)

Substitute Categories:

MFR Recommended Substitutes maintain full electrical and mechanical compatibility with identical or superior specifications:

• LTC491CN#PBF and LTC491IN#PBF (Analog Devices Inc.)
• MAX3491CPD+ and MAX3491EPD+ (Analog Devices Inc./Maxim Integrated)

Parametric Equivalent provides functional equivalence with identical core parameters:

• SN75ALS180N (Texas Instruments)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Supply Voltage):

LTC491CN#PBF and LTC491IN#PBF are active products from Analog Devices Inc. with identical 4.75V ~ 5.25V supply voltage and 14-DIP package. LTC491IN#PBF extends the operating temperature range to -40°C ~ 85°C, providing superior thermal performance for extended-range applications. Both parts maintain ROHS3 compliance and full RS422/RS485 protocol support.

For Low-Voltage Applications:

MAX3491CPD+ and MAX3491EPD+ operate at 3V ~ 3.6V supply voltage, making them suitable for designs requiring lower supply rails. MAX3491EPD+ provides extended operating temperature range (-40°C ~ 85°C) and higher inventory availability (3198 pcs). Both support 10 Mbps data rate and maintain identical 14-DIP package compatibility.

For Texas Instruments Ecosystem:

SN75ALS180N is a parametric equivalent from Texas Instruments with identical 4.75V ~ 5.25V supply voltage, 60 mV receiver hysteresis, and 14-DIP package. This part is also obsolete but provides continuity within the Texas Instruments product line.

Product Status Consideration:

All MFR recommended substitutes (LTC491CN#PBF, LTC491IN#PBF, MAX3491CPD+, MAX3491EPD+) are active products with ongoing manufacturing and supply availability, addressing the obsolescence of the SN75ALS181N.

Frequently Asked Questions (FAQ)

Q: Can LTC491CN#PBF and LTC491IN#PBF be used interchangeably with SN75ALS181N?

A: Both parts are pin-compatible 14-DIP transceivers with identical RS422/RS485 protocol support, full-duplex operation, and 4.75V ~ 5.25V supply voltage. LTC491IN#PBF offers extended operating temperature range (-40°C ~ 85°C) compared to the standard 0°C ~ 70°C. Selection depends on thermal requirements of the application.

Q: What is the difference between MAX3491CPD+ and MAX3491EPD+?

A: Both parts are functionally identical MAX3491 transceivers in 14-DIP packages with 3V ~ 3.6V supply voltage and 10 Mbps data rate. MAX3491EPD+ supports extended operating temperature range (-40°C ~ 85°C) versus MAX3491CPD+ (0°C ~ 70°C). MAX3491EPD+ has higher inventory availability (3198 pcs).

Q: Can MAX3491 series parts replace SN75ALS181N directly?

A: MAX3491CPD+ and MAX3491EPD+ are functionally compatible but operate at 3V ~ 3.6V supply voltage, differing from SN75ALS181N's 4.75V ~ 5.25V requirement. These parts are suitable only for designs with compatible low-voltage power supplies. Pin configuration and package are identical (14-DIP).

Q: Is SN75ALS180N a suitable replacement for SN75ALS181N?

A: SN75ALS180N is a parametric equivalent with identical electrical specifications (4.75V ~ 5.25V, 60 mV hysteresis, 0°C ~ 70°C operating range) and 14-DIP package. However, both parts are obsolete. Active substitutes from Analog Devices Inc. (LTC491 series) or Maxim Integrated (MAX3491 series) are recommended for new designs.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the SN75ALS181N compliance profile. All parts carry EAR99 ECCN classification and 8542.39.0001 HTSUS code.

Q: How does receiver hysteresis affect part selection?

A: Receiver hysteresis values (50 mV for MAX3491 series, 60 mV for SN75ALS181N and SN75ALS180N, 70 mV for LTC491 series) determine noise immunity and switching threshold characteristics. Selection should align with signal integrity requirements of the specific application. All values are within standard RS422/RS485 specifications.