MAX3491ECPD Equivalent & Substitute Parts

Part Overview

The MAX3491ECPD is a 1/1 transceiver IC for RS422 and RS485 serial communication interfaces, housed in a 14-pin DIP package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement planning. The part operates across a 3V to 3.6V supply range with a 10 Mbps data rate capability and full-duplex communication support.

Substiute Parts

MAX3491ECPD

Analog Devices Inc./Maxim IntegratedIn Stock: 14883MAX3491ECPD Datasheet

Current PartRFQ

MAX3491CPD+

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

Parametric EquivalentRFQ

SN75ALS180N

Texas InstrumentsIn Stock: 4319SN75ALS180N Datasheet

MFR RecommendedRFQ

SN75ALS181N

Texas InstrumentsIn Stock: 2189SN75ALS181N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3491ECPD is determined by the following critical parameters:

Primary Compatibility Criteria:

• Protocol support: RS422 and RS485
• Driver/Receiver configuration: 1/1
• Duplex mode: Full
• Package type: 14-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Operating temperature range: 0°C ~ 70°C

Secondary Consideration Parameters:

• Receiver hysteresis tolerance
• Data rate capability
• Supply voltage range compatibility
• RoHS and regulatory compliance status

Substitute parts must maintain identical protocol support, driver/receiver count, duplex capability, and physical package specifications. Variations in receiver hysteresis, data rate, and supply voltage are permissible when the substitute part's specifications encompass or exceed the application requirements of the original part.

Parameter Comparison

Engineering Selection Recommendations

MAX3491CPD+ (Parametric Equivalent)

The MAX3491CPD+ is the direct parametric equivalent to the MAX3491ECPD. Both parts share identical electrical specifications including 3V to 3.6V supply voltage, 50 mV receiver hysteresis, and 10 Mbps data rate. The MAX3491CPD+ is currently in active production status and carries ROHS3 compliance certification, addressing the RoHS non-compliance limitation of the original part. This substitute is recommended as the primary replacement option for new designs and ongoing procurement.

SN75ALS180N and SN75ALS181N (Functional Alternatives)

The Texas Instruments SN75ALS180N and SN75ALS181N are functional alternatives that maintain identical protocol support, driver/receiver configuration, duplex capability, and physical package specifications. Both parts operate at 4.75V to 5.25V supply voltage, which differs from the original part's 3V to 3.6V range. These substitutes are suitable only for applications where the higher supply voltage is compatible with the system design. Both parts carry ROHS3 compliance certification. The SN75ALS181N is available in tube packaging, while the SN75ALS180N packaging is not specified.

Frequently Asked Questions (FAQ)

Q: Can the MAX3491CPD+ directly replace the MAX3491ECPD without circuit modifications?

A: Yes. The MAX3491CPD+ maintains identical electrical and physical specifications as the MAX3491ECPD, including supply voltage range (3V to 3.6V), receiver hysteresis (50 mV), data rate (10 Mbps), and 14-DIP package configuration. No circuit modifications are required for direct substitution.

Q: What is the primary difference between MAX3491CPD+ and the original MAX3491ECPD?

A: The MAX3491CPD+ is in active production status with ROHS3 compliance certification, whereas the MAX3491ECPD is obsolete and RoHS non-compliant. All functional and electrical parameters remain identical.

Q: Can SN75ALS180N or SN75ALS181N be used as drop-in replacements?

A: These parts are not drop-in replacements due to supply voltage differences. The SN75ALS180N and SN75ALS181N operate at 4.75V to 5.25V, while the MAX3491ECPD requires 3V to 3.6V. Substitution is only possible if the application circuit operates at the higher voltage range. Physical package compatibility (14-DIP) and protocol support (RS422/RS485) are maintained.

Q: What is the significance of receiver hysteresis differences between parts?

A: The MAX3491ECPD and MAX3491CPD+ specify 50 mV receiver hysteresis, while the SN75ALS180N and SN75ALS181N specify 60 mV. Higher hysteresis provides improved noise immunity but may affect signal detection sensitivity. Selection depends on application noise environment and signal margin requirements.

Q: Are all substitute parts RoHS compliant?

A: The MAX3491CPD+ carries ROHS3 compliance certification. The SN75ALS180N and SN75ALS181N also carry ROHS3 compliance certification. The original MAX3491ECPD is RoHS non-compliant. For applications requiring RoHS compliance, the MAX3491CPD+ is the recommended choice.

Q: What packaging options are available for substitute parts?

A: The MAX3491CPD+ is supplied in tube packaging. The SN75ALS181N is supplied in tube packaging. The SN75ALS180N packaging specification is not provided. All parts maintain the 14-DIP physical package format.