MAX3491CSD Equivalent & Substitute Parts

Part Overview

The MAX3491CSD is a 1/1 transceiver IC for RS422 and RS485 serial communication protocols, housed in a 14-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer enhanced operating temperature ranges or improved compliance status.

Key Parameters

Parameter	Specification
Protocol Support	RS422, RS485
Drivers/Receivers Configuration	1/1 (Full Duplex)
Data Rate	10 Mbps
Supply Voltage	3V to 3.6V
Receiver Hysteresis	50 mV
Operating Temperature Range	0°C to 70°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX3491CSD is determined by strict adherence to the following parameters:

Core Compatibility Parameters:

Protocol: RS422 and RS485
Configuration: 1/1 Drivers/Receivers (Full Duplex)
Data Rate: 10 Mbps
Supply Voltage: 3V to 3.6V
Receiver Hysteresis: 50 mV
Package: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Substitute Categories:

Parametric Equivalents maintain all electrical specifications and differ only in product status (Active vs. Obsolete) and RoHS compliance:

MAX3491CSD+ (Tube packaging, ROHS3 Compliant)
MAX3491ECSD+ (Tube packaging, ROHS3 Compliant)

Upgrade Substitutes maintain all core electrical parameters but extend the operating temperature range to -40°C to 85°C, providing enhanced thermal performance:

ADM3491ARZ (Tube packaging)
ADM3491ARZ-REEL (Cut Tape & Digi-Reel packaging)
ADM3491ARZ-REEL7 (Cut Tape & Digi-Reel packaging)
ADM3491EARZ (Tube packaging, MFR Recommended)
ADM3491EARZ-REEL7 (Cut Tape & Digi-Reel packaging, MFR Recommended)

Cross-Manufacturer Substitutes from Renesas Electronics maintain all electrical specifications with extended operating temperature:

ISL83491IBZ (Tube packaging)
ISL83491IBZ-T (Cut Tape & Digi-Reel packaging)

Parameter Comparison

Part Number	Manufacturer	Product Status	Operating Temperature	Supply Voltage	Data Rate	Package	RoHS Status	Inventory (Pcs)
MAX3491CSD	Analog Devices Inc./Maxim Integrated	Obsolete	0°C to 70°C	3V to 3.6V	10 Mbps	14-SOIC	RoHS Non-Compliant	12,900
MAX3491CSD+	Analog Devices Inc./Maxim Integrated	Active	0°C to 70°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	2,100
MAX3491ECSD+	Analog Devices Inc./Maxim Integrated	Active	0°C to 70°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	12,700
ADM3491ARZ	Analog Devices Inc.	Active	-40°C to 85°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	1,373
ADM3491ARZ-REEL	Analog Devices Inc.	Active	-40°C to 85°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	17,164
ADM3491ARZ-REEL7	Analog Devices Inc.	Active	-40°C to 85°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	30,153
ADM3491EARZ	Analog Devices Inc.	Active	-40°C to 85°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	2,300
ADM3491EARZ-REEL7	Analog Devices Inc.	Active	-40°C to 85°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	3,796
ISL83491IBZ	Renesas Electronics Corporation	Active	-40°C to 85°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	7,027
ISL83491IBZ-T	Renesas Electronics Corporation	Active	-40°C to 85°C	3V to 3.6V	10 Mbps	14-SOIC	ROHS3 Compliant	1,523

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Temperature): MAX3491ECSD+ is the primary active equivalent, offering identical electrical specifications and operating temperature range (0°C to 70°C) with ROHS3 compliance and highest inventory availability (12,700 units). MAX3491CSD+ provides the same specifications with lower inventory (2,100 units).

For Extended Temperature Applications: ADM3491ARZ-REEL7 is recommended for designs requiring extended operating temperature (-40°C to 85°C), with the highest inventory level (30,153 units) and Cut Tape & Digi-Reel packaging. ADM3491ARZ-REEL provides equivalent specifications with 17,164 units available. Both are ROHS3 compliant and manufactured by Analog Devices Inc.

For Manufacturer-Recommended Substitutes: ADM3491EARZ and ADM3491EARZ-REEL7 are designated as manufacturer-recommended alternatives, maintaining extended temperature performance with ROHS3 compliance.

For Cross-Manufacturer Alternatives: ISL83491IBZ (Renesas Electronics) provides equivalent electrical specifications with extended temperature range and ROHS3 compliance. ISL83491IBZ-T offers the same specifications in Cut Tape & Digi-Reel packaging format.

All substitute parts maintain identical protocol support (RS422/RS485), configuration (1/1 Full Duplex), data rate (10 Mbps), supply voltage (3V to 3.6V), and package type (14-SOIC).

Frequently Asked Questions (FAQ)

Q: Can MAX3491CSD be directly replaced with MAX3491ECSD+? A: Yes. MAX3491ECSD+ maintains identical electrical specifications, operating temperature range (0°C to 70°C), supply voltage (3V to 3.6V), data rate (10 Mbps), and 14-SOIC package. The primary difference is product status (Active vs. Obsolete) and ROHS3 compliance.

Q: What is the difference between parametric equivalents and upgrade substitutes? A: Parametric equivalents (MAX3491CSD+, MAX3491ECSD+) maintain the original 0°C to 70°C operating temperature range. Upgrade substitutes (ADM3491 series, ISL83491 series) extend the operating temperature to -40°C to 85°C, enabling use in wider thermal environments while maintaining all other electrical specifications.

Q: Are packaging options interchangeable? A: Packaging options differ in delivery format only. Tube packaging, Cut Tape (CT), and Digi-Reel packaging contain identical components with the same electrical specifications. Selection depends on assembly process requirements and quantity needs. All maintain the 14-SOIC (0.154", 3.90mm Width) physical package.

Q: What does ROHS3 compliance mean for substitution? A: ROHS3 compliance indicates adherence to Restriction of Hazardous Substances regulations. The original MAX3491CSD is RoHS non-compliant, while all active substitutes are ROHS3 compliant, making them suitable for applications with regulatory compliance requirements.

Q: Can ISL83491IBZ replace MAX3491CSD in all applications? A: ISL83491IBZ maintains identical RS422/RS485 protocol support, 1/1 configuration, 10 Mbps data rate, 3V to 3.6V supply voltage, and 14-SOIC package. The cross-manufacturer substitution is electrically compatible. Moisture Sensitivity Level differs (MSL 3 vs. MSL 1), which may affect storage and handling requirements.

Q: Which substitute offers the best inventory availability? A: ADM3491ARZ-REEL7 provides the highest inventory (30,153 units) with extended temperature performance (-40°C to 85°C), ROHS3 compliance, and Cut Tape & Digi-Reel packaging.

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