MAX3491ECSD Equivalent & Substitute Parts

Part Overview

The MAX3491ECSD is a full-duplex RS422/RS485 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 14-SOIC surface mount package. This component is classified as obsolete, with 12,600 units currently in stock. The part operates across a 3V to 3.6V supply range and supports data rates up to 10 Mbps with a receiver hysteresis of 50 mV. Due to its obsolete status and non-RoHS3 compliance, identifying equivalent and substitute parts is essential for new designs and long-term supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3491ECSD
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	10 Mbps
Voltage - Supply	3V ~ 3.6V
Receiver Hysteresis	50 mV
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX3491ECSD is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS422/RS485 full-duplex operation
Number of Drivers/Receivers: 1/1 configuration
Data Rate: 10 Mbps minimum
Voltage Supply Range: 3V ~ 3.6V compatibility
Receiver Hysteresis: 50 mV
Package: 14-SOIC form factor
Mounting Type: Surface Mount

Substitution Categories:

Parametric Equivalents maintain identical electrical specifications and operating conditions as the original part. These include MAX3491CSD+ and MAX3491ECSD+, both active products with RoHS3 compliance and identical parameter sets.

Upgrade Parts provide extended operating temperature ranges (-40°C ~ 85°C versus 0°C ~ 70°C) while maintaining all other electrical parameters. These include ADM3491EARZ, ADM3491EARZ-REEL7, ADM3491ARZ, and ADM3491ARZ-REEL from Analog Devices, as well as ISL83491IBZ and ISL83491IBZ-T from Renesas Electronics.

Enhanced Performance Alternatives offer improved specifications beyond the original part requirements. ISL83076EIBZA from Renesas provides 20 Mbps data rate capability and 15 mV receiver hysteresis, representing a performance upgrade while maintaining 14-SOIC packaging and 3V ~ 3.6V supply compatibility.

All substitute parts maintain the 14-SOIC package footprint, surface mount configuration, and MSL rating compatibility required for direct board-level replacement.

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Data Rate	Operating Temp	Supply Voltage	Receiver Hysteresis	RoHS Status	Packaging	Inventory
MAX3491ECSD	Analog Devices/Maxim	Obsolete	RS422, RS485	10 Mbps	0°C ~ 70°C	3V ~ 3.6V	50 mV	Non-compliant	Tube	12,600
MAX3491CSD+	Analog Devices/Maxim	Active	RS422, RS485	10 Mbps	0°C ~ 70°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Tube	2,100
MAX3491ECSD+	Analog Devices/Maxim	Active	RS422, RS485	10 Mbps	0°C ~ 70°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Tube	12,700
ADM3491EARZ	Analog Devices	Active	RS422, RS485	10 Mbps	-40°C ~ 85°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Tube	2,300
ADM3491EARZ-REEL7	Analog Devices	Active	RS422, RS485	10 Mbps	-40°C ~ 85°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Cut Tape & Digi-Reel	3,796
ADM3491ARZ	Analog Devices	Active	RS422, RS485	10 Mbps	-40°C ~ 85°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Tube	1,373
ADM3491ARZ-REEL	Analog Devices	Active	RS422, RS485	10 Mbps	-40°C ~ 85°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Cut Tape & Digi-Reel	17,164
ADM3491ARZ-REEL7	Analog Devices	Active	RS422, RS485	10 Mbps	-40°C ~ 85°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Cut Tape & Digi-Reel	30,153
ISL83491IBZ	Renesas Electronics	Active	RS422, RS485	10 Mbps	-40°C ~ 85°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Tube	7,027
ISL83491IBZ-T	Renesas Electronics	Active	RS422, RS485	10 Mbps	-40°C ~ 85°C	3V ~ 3.6V	50 mV	ROHS3 Compliant	Cut Tape & Digi-Reel	1,523
ISL83076EIBZA	Renesas Electronics	Active	RS422, RS485	20 Mbps	-40°C ~ 85°C	3V ~ 3.6V	15 mV	ROHS3 Compliant	Tube	3,000,400

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select MAX3491ECSD+ or MAX3491CSD+ when operating temperature range of 0°C ~ 70°C is acceptable. Both parts are active products with RoHS3 compliance, ensuring regulatory alignment for new designs. MAX3491ECSD+ offers the highest inventory availability at 12,700 units.

For Extended Temperature Range Applications: ADM3491ARZ-REEL7 and ADM3491ARZ-REEL provide the largest inventory quantities (30,153 and 17,164 units respectively) with -40°C ~ 85°C operating range and RoHS3 compliance. These parts are suitable for industrial and automotive environments requiring wider temperature operation.

For Cross-Manufacturer Alternatives: ISL83491IBZ and ISL83491IBZ-T from Renesas Electronics provide identical electrical specifications to the ADM3491 series with -40°C ~ 85°C operating range and RoHS3 compliance. ISL83491IBZ-T in cut tape format offers flexibility for automated assembly processes.

For Performance Enhancement: ISL83076EIBZA represents an upgrade option with doubled data rate capability (20 Mbps) and improved receiver hysteresis (15 mV), while maintaining 3V ~ 3.6V supply compatibility and 14-SOIC packaging. This part is suitable for applications requiring higher bandwidth within the same form factor.

All recommended substitutes maintain identical 14-SOIC package geometry and surface mount configuration, enabling direct PCB-level replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can MAX3491ECSD be replaced with MAX3491ECSD+? A: Yes. MAX3491ECSD+ is an active product variant with identical electrical specifications (10 Mbps, 50 mV hysteresis, 3V ~ 3.6V supply, 0°C ~ 70°C operating range) and 14-SOIC packaging. The primary difference is RoHS3 compliance status and active product lifecycle. Both parts are pin-compatible and functionally equivalent.

Q: What is the difference between ADM3491EARZ and ADM3491ARZ? A: Both parts share identical electrical specifications and -40°C ~ 85°C operating temperature range. The primary distinction is packaging format: ADM3491EARZ is supplied in tube packaging, while ADM3491ARZ is also tube-packaged. Variant suffixes (-REEL, -REEL7) indicate cut tape and Digi-Reel packaging options for automated assembly environments.

Q: Is ISL83076EIBZA a direct substitute for MAX3491ECSD? A: ISL83076EIBZA is a functional upgrade rather than a direct substitute. While it maintains 14-SOIC packaging, 3V ~ 3.6V supply voltage, and RS422/RS485 protocol compatibility, it offers enhanced specifications: 20 Mbps data rate (versus 10 Mbps) and 15 mV receiver hysteresis (versus 50 mV). It is suitable for applications requiring higher performance within the same form factor.

Q: Why do some parts have extended temperature ranges (-40°C ~ 85°C)? A: Extended temperature range variants (ADM3491 and ISL83491 series) are designed for industrial, automotive, and harsh environment applications. The original MAX3491ECSD operates 0°C ~ 70°C, limiting use in temperature-extreme conditions. Extended-range parts maintain identical electrical performance while supporting broader operational environments.

Q: Are all substitute parts RoHS3 compliant? A: All active substitute parts listed (MAX3491CSD+, MAX3491ECSD+, ADM3491 series, ISL83491 series, and ISL83076EIBZA) are RoHS3 compliant. The original MAX3491ECSD is non-compliant. For new designs and regulatory requirements, select from the active, RoHS3-compliant alternatives.

Q: What packaging options are available for high-volume assembly? A: Cut tape and Digi-Reel packaging is available for ADM3491EARZ-REEL7, ADM3491ARZ-REEL, ADM3491ARZ-REEL7, and ISL83491IBZ-T. These formats are optimized for automated pick-and-place assembly. Tube packaging is available for all parts and is suitable for manual or semi-automated assembly processes.

Q: Can I use ISL83491IBZ as a drop-in replacement? A: Yes. ISL83491IBZ maintains identical electrical specifications to ADM3491EARZ (10 Mbps, 50 mV hysteresis, 3V ~ 3.6V supply, -40°C ~ 85°C operating range) and 14-SOIC packaging. It is a cross-manufacturer alternative from Renesas Electronics with RoHS3 compliance and equivalent performance characteristics.

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